diff --git a/kite/src/BuildBlockages.cpp b/kite/src/BuildBlockages.cpp
index aa234c5b..ca54bbf4 100644
--- a/kite/src/BuildBlockages.cpp
+++ b/kite/src/BuildBlockages.cpp
@@ -2,7 +2,7 @@
 // -*- C++ -*-
 //
 // This file is part of the Coriolis Software.
-// Copyright (c) UPMC/LIP6 2008-2009, All Rights Reserved
+// Copyright (c) UPMC/LIP6 2008-2010, All Rights Reserved
 //
 // ===================================================================
 //
diff --git a/kite/src/BuildPowerRails.cpp b/kite/src/BuildPowerRails.cpp
index 0ce37594..173f9288 100644
--- a/kite/src/BuildPowerRails.cpp
+++ b/kite/src/BuildPowerRails.cpp
@@ -579,6 +579,7 @@ namespace Kite {
 
     forEach ( BasicLayer*, iLayer, technology->getBasicLayers() ) {
       if ( iLayer->getMaterial() != BasicLayer::Material::metal ) continue;
+      if ( _configuration.isGMetal(*iLayer) ) continue;
 
       cmess1 << "     - PowerRails in " << iLayer->getName() << " ..." << endl;
 
diff --git a/kite/src/Configuration.cpp b/kite/src/Configuration.cpp
index fdaef9cf..bde4d0f6 100644
--- a/kite/src/Configuration.cpp
+++ b/kite/src/Configuration.cpp
@@ -2,7 +2,7 @@
 // -*- C++ -*-
 //
 // This file is part of the Coriolis Software.
-// Copyright (c) UPMC/LIP6 2008-2009, All Rights Reserved
+// Copyright (c) UPMC/LIP6 2008-2010, All Rights Reserved
 //
 // ===================================================================
 //
@@ -16,7 +16,7 @@
 // |  Author      :                    Jean-Paul CHAPUT              |
 // |  E-mail      :       Jean-Paul.Chaput@asim.lip6.fr              |
 // | =============================================================== |
-// |  C++ Module  :       "./Configuartion.cpp"                      |
+// |  C++ Module  :       "./Configuration.cpp"                      |
 // | *************************************************************** |
 // |  U p d a t e s                                                  |
 // |                                                                 |
@@ -62,15 +62,16 @@ namespace Kite {
     , _base               (base)
     , _postEventCb        ()
     , _edgeCapacityPercent(_defaultEdgeCapacity)
-    , _expandStep         (0.30)
+    , _expandStep         (0.40)
     , _ripupLimits        ()
     , _ripupCost          (3)
+    , _eventsLimit        (4000000)
   {
     _ripupLimits[BorderRipupLimit]     = 26;
     _ripupLimits[StrapRipupLimit]      = 16;
     _ripupLimits[LocalRipupLimit]      =  7;
-    _ripupLimits[GlobalRipupLimit]     =  7;
-    _ripupLimits[LongGlobalRipupLimit] =  7;
+    _ripupLimits[GlobalRipupLimit]     =  5;
+    _ripupLimits[LongGlobalRipupLimit] =  5;
   }
 
 
diff --git a/kite/src/GCell.cpp b/kite/src/GCell.cpp
index 6ea3b84c..6f74b413 100644
--- a/kite/src/GCell.cpp
+++ b/kite/src/GCell.cpp
@@ -393,7 +393,7 @@ namespace Kite {
       Interval      blockageSpan;
 
       autoSegment->getCanonical ( fixedSpan );
-      fixedSpan.inflate ( Session::getExtensionCap() );
+      fixedSpan.inflate ( Session::getExtensionCap()-1 );
 
       track->getOverlapBounds ( fixedSpan, begin, end );
       for ( ; (begin < end) ; begin++ ) {
diff --git a/kite/src/GCellGrid.cpp b/kite/src/GCellGrid.cpp
index 7635f74d..09c1c0f3 100644
--- a/kite/src/GCellGrid.cpp
+++ b/kite/src/GCellGrid.cpp
@@ -49,7 +49,7 @@ namespace Kite {
 
 
   GCellGrid::GCellGrid ( KiteEngine* kite )
-    : Katabatic::Grid<GCell>()
+    : Katabatic::Grid<GCell>(kite->getCell()->getBoundingBox())
     , _kite(kite)
   { }
 
diff --git a/kite/src/KiteEngine.cpp b/kite/src/KiteEngine.cpp
index ac8fbf67..a6f12092 100644
--- a/kite/src/KiteEngine.cpp
+++ b/kite/src/KiteEngine.cpp
@@ -488,15 +488,19 @@ namespace Kite {
   void  KiteEngine::dumpMeasures ( ostream& out ) const
   {
     vector<Name> measuresLabels;
-    measuresLabels.push_back ( "Gates" );
-    measuresLabels.push_back ( "GCells" );
-    measuresLabels.push_back ( "loadT" );
-    measuresLabels.push_back ( "loadS" );
+    measuresLabels.push_back ( "Gates"   );
+    measuresLabels.push_back ( "GCells"  );
+    measuresLabels.push_back ( "knikT"   );
+    measuresLabels.push_back ( "knikS"   );
+    measuresLabels.push_back ( "loadT"   );
+    measuresLabels.push_back ( "loadS"   );
+    measuresLabels.push_back ( "Globals" );
+    measuresLabels.push_back ( "Edges"   );
     measuresLabels.push_back ( "assignT" );
-    measuresLabels.push_back ( "algoT" );
-    measuresLabels.push_back ( "algoS" );
-    measuresLabels.push_back ( "finT" );
-    measuresLabels.push_back ( "Segs" );
+    measuresLabels.push_back ( "algoT"   );
+    measuresLabels.push_back ( "algoS"   );
+    measuresLabels.push_back ( "finT"    );
+    measuresLabels.push_back ( "Segs"    );
 
     const MeasuresSet* measures = Measures::get(getCell());
 
diff --git a/kite/src/NegociateWindow.cpp b/kite/src/NegociateWindow.cpp
index d7d6ee20..c576c9d4 100644
--- a/kite/src/NegociateWindow.cpp
+++ b/kite/src/NegociateWindow.cpp
@@ -2,7 +2,7 @@
 // -*- C++ -*-
 //
 // This file is part of the Coriolis Software.
-// Copyright (c) UPMC/LIP6 2008-2009, All Rights Reserved
+// Copyright (c) UPMC/LIP6 2008-2010, All Rights Reserved
 //
 // ===================================================================
 //
@@ -82,14 +82,15 @@ namespace {
     if ( data->getGCellOrder() >= Session::getOrder() ) {
       cost.mergeRipupCount ( data->getRipupCount() );
       if ( segment->isLocal() ) {
-        cost.mergeDataState  ( data->getState() );
+        cost.mergeDataState ( data->getState() );
         if ( data->getState() >=  DataNegociate::LocalVsGlobal ) {
           ltrace(200) << "MaximumSlack/LocalVsGlobal for " << segment << endl;
         }
       }
     }
 
-    if ( /*(data->getGCellOrder() < Session::getOrder()) ||*/ segment->isFixed() ) {
+    if ( /*(data->getGCellOrder() < Session::getOrder()) ||*/ segment->isFixed()
+       or ((data->isRing() or data->isBorder()) and (data->getRipupCount() > 3)) ) {
       ltrace(200) << "Infinite cost from: " << segment << endl;
       cost.setFixed       ();
       cost.setInfinite    ();
@@ -272,7 +273,7 @@ namespace Kite {
 
     unsigned int order = 0;
     for ( size_t i=0 ; i < gcells.size() ; i++ ) {
-      if ( !gcells[i]->isInRoutingSet() ) {
+      if ( not gcells[i]->isInRoutingSet() ) {
         Session::setOrder ( order );
         GCellRoutingSet* rs = GCellRoutingSet::create ( gcells[i], _kite->getExpandStep() );
         rs->expand      ( grid  );
@@ -336,6 +337,7 @@ namespace Kite {
       DataNegociate* data    = segment->getDataNegociate ();
 
       data->resetRipupCount ();
+      data->resetStateCount ();
       data->setGCellOrder ( order );
       if ( _ring[i].getOrder() == order ) {
         ltrace(200) << "Removing from ring: " << segment << endl;
@@ -353,6 +355,8 @@ namespace Kite {
     ltrace(150) << "NegociateWindow::_negociate() - " << segments.size() << endl;
     ltracein(149);
 
+    unsigned long limit = _kite->getEventsLimit();
+
     _eventHistory.clear();
     _eventQueue.load ( segments );
     _loadRing ();
@@ -375,7 +379,7 @@ namespace Kite {
         cmess2.flush();
       }
 
-      if ( RoutingEvent::getProcesseds() >= /*10471*/ 4000000 ) setInterrupt ( true );
+      if ( RoutingEvent::getProcesseds() >= limit ) setInterrupt ( true );
       count++;
 
 #if ENABLE_STIFFNESS
diff --git a/kite/src/RoutingEvent.cpp b/kite/src/RoutingEvent.cpp
index 7d036998..d51a8205 100644
--- a/kite/src/RoutingEvent.cpp
+++ b/kite/src/RoutingEvent.cpp
@@ -2,7 +2,7 @@
 // -*- C++ -*-
 //
 // This file is part of the Coriolis Software.
-// Copyright (c) UPMC/LIP6 2008-2009, All Rights Reserved
+// Copyright (c) UPMC/LIP6 2008-2010, All Rights Reserved
 //
 // ===================================================================
 //
@@ -800,13 +800,14 @@ namespace {
     public:
       enum { ToRipupLimit=1, AllowExpand  =2, NoExpand=4, PerpandicularsFirst=8, ToMoveUp=16 };
       enum { LeftAxisHint=1, RightAxisHint=2 };
+      enum { NoRingLimit=1 };
     public:
                                   Manipulator             ( TrackElement*, State& );
                                  ~Manipulator             ();
       inline TrackElement*        getSegment              () const;
       inline DataNegociate*       getData                 () const;
       inline RoutingEvent*        getEvent                () const;
-             bool                 canRipup                () const;
+             bool                 canRipup                ( unsigned int flags=0 ) const;
              bool                 isCaged                 ( DbU::Unit ) const;
              bool                 ripup                   ( Interval     overlap
                                                           , unsigned int type
@@ -1131,7 +1132,7 @@ namespace {
     Interval              constraints;
     vector<Cs1Candidate>  candidates;
     TrackElement*         segment    = _event->getSegment();
-    bool                  canMoveUp  = (segment->isLocal()) ? segment->canPivotUp() : segment->canMoveUp();
+    bool                  canMoveUp  = (segment->isLocal()) ? segment->canPivotUp(1.0) : segment->canMoveUp(1.0);
     unsigned int          relaxFlags
       = (_data and (_data->getStateCount() < 2)) ? Manipulator::AllowExpand : Manipulator::NoExpand;
 
@@ -1193,7 +1194,7 @@ namespace {
 
         if (    other->isGlobal()
            and (other->getDataNegociate()->getGCellOrder() == Session::getOrder())
-           and  other->canMoveUp() ) {
+           and  other->canMoveUp(1.0) ) {
           ltrace(200) << "conflictSolve1() - One conflict, other move up" << endl;
           if ( (success = other->moveUp()) ) break;
         }
@@ -1367,11 +1368,12 @@ namespace {
   {
     DebugSession::open ( segment->getNet(), 200 );
 
-    bool           success   = false;
-    bool           blocked   = false;
-    bool           repush    = true;
-    DataNegociate* data      = segment->getDataNegociate ();
-    unsigned int   nextState = 0;
+    bool           success     = false;
+    bool           blocked     = false;
+    bool           repush      = true;
+    DataNegociate* data        = segment->getDataNegociate ();
+    unsigned int   nextState   = data->getState();
+    unsigned int   actionFlags = SegmentAction::SelfInsert|SegmentAction::EventLevel5;
 
     ltrace(200) << "Slacken Topology for " << segment->getNet()
                 << " " << segment << endl;
@@ -1383,7 +1385,7 @@ namespace {
     if ( not (data->isBorder() or data->isRing()) ) {
       data->resetRipupCount ();
     } else {
-      if ( not Manipulator(segment,*this).canRipup() ) {
+      if ( not Manipulator(segment,*this).canRipup(Manipulator::NoRingLimit) ) {
         cerr << "[UNSOLVED] " << segment << " slacken topology not allowed for border/ring." << endl;
         ltraceout(200);
         DebugSession::close ();
@@ -1394,7 +1396,7 @@ namespace {
   // Ring cases.
     if ( data->isBorder() ) {
       ltrace(200) << "Segment is Ripup only (border), bypass to Unimplemented." << endl;
-      if ( not Manipulator(segment,*this).canRipup () ) {
+      if ( not Manipulator(segment,*this).canRipup (Manipulator::NoRingLimit) ) {
         ltrace(200) << "Cannot ripup, bypass to Unimplemented." << endl;
         data->setState ( DataNegociate::Unimplemented );
       } else {
@@ -1421,6 +1423,7 @@ namespace {
   // Normal cases.
     if ( not blocked and not success ) {
       if ( segment->isStrap() ) {
+        ltrace(200) << "Strap segment FSM." << endl;
         switch ( data->getState() ) {
           case DataNegociate::RipupPerpandiculars:
             nextState = DataNegociate::Desalignate;
@@ -1452,13 +1455,11 @@ namespace {
         }
 
         if ( not success and (nextState != DataNegociate::Unimplemented) ) {
-        // if ( segment->canRipple() )
-        //   success = Manipulator(segment,*this).ripple();
-        // else
           success = Manipulator(segment,*this).ripupPerpandiculars(Manipulator::ToRipupLimit);
         }
       } else if ( segment->isLocal() ) {
       // Local TrackElement State Machine.
+        ltrace(200) << "Local segment FSM." << endl;
         switch ( data->getState() ) {
           case DataNegociate::RipupPerpandiculars:
             nextState = DataNegociate::Desalignate;
@@ -1502,7 +1503,7 @@ namespace {
             }
           case DataNegociate::MaximumSlack:
             if ( segment->isSlackenStrap() ) { 
-              if ( nextState < DataNegociate::MaximumSlack ) {
+              if ( (nextState < DataNegociate::MaximumSlack) or (data->getStateCount() < 2) ) {
                 nextState = DataNegociate::MaximumSlack;
                 success = conflictSolve1 ();
                 if ( success ) break;
@@ -1514,10 +1515,8 @@ namespace {
         }
 
         if ( not success and (nextState != DataNegociate::Unimplemented) ) {
-        // if ( segment->canRipple() )
-        //   success = Manipulator(segment,*this).ripple();
-        // else
-          success = Manipulator(segment,*this).ripupPerpandiculars(Manipulator::ToRipupLimit);
+          if ( data->getStateCount() < 6 )
+            success = Manipulator(segment,*this).ripupPerpandiculars(Manipulator::ToRipupLimit);
         }
 
       // Special case: all tracks are overlaping a blockage.
@@ -1560,6 +1559,7 @@ namespace {
       } else {
       // Global TrackElement State Machine.
         switch ( data->getState() ) {
+          ltrace(200) << "Global segment FSM." << endl;
           case DataNegociate::RipupPerpandiculars:
             ltrace(200) << "Global, State: RipupPerpandiculars." << endl;
             nextState = DataNegociate::Desalignate;
@@ -1603,7 +1603,8 @@ namespace {
         }
 
         if ( not success and (nextState != DataNegociate::Unimplemented) ) {
-          success = Manipulator(segment,*this).ripupPerpandiculars(Manipulator::ToRipupLimit);
+          if ( data->getStateCount() < 6 )
+            success = Manipulator(segment,*this).ripupPerpandiculars(Manipulator::ToRipupLimit);
         }
       }
     }
@@ -1612,11 +1613,10 @@ namespace {
 
     if ( success ) {
       if ( repush ) {
-        unsigned int flags = SegmentAction::SelfInsert|SegmentAction::EventLevel5;
         if ( not (data->isRing() or data->isBorder()) )
-          flags |= SegmentAction::ResetRipup;
+          actionFlags |= SegmentAction::ResetRipup;
       
-        addAction ( segment, flags );
+        addAction ( segment, actionFlags );
       }
     } else {
       clearActions ();
@@ -1664,11 +1664,19 @@ namespace {
   }
 
 
-  bool  Manipulator::canRipup () const
+  bool  Manipulator::canRipup ( unsigned int flags ) const
   {
     if ( _data ) {
+      if ( not _event or _event->isUnimplemented() ) return false;
+
       unsigned int limit = Session::getKiteEngine()->getRipupLimit(_segment);
-      return (_data->getRipupCount() < limit) and _event and not _event->isUnimplemented();
+
+      if (   not ( flags & NoRingLimit )
+         and (_data->isRing() or _data->isBorder())
+         and not (_data->getRipupCount() < limit) )
+        return false;
+
+      return (_data->getRipupCount() < limit);
     }
 
     return false;
@@ -1713,8 +1721,10 @@ namespace {
     ltrace(200) << "TrackElement:" << _data->getGCellOrder()
                 << " < Session:" << Session::getOrder() << endl;
 
+    if ( not canRipup() ) return false;
+
     if ( _segment->isFixed() ) return false;
-    if ( !_data ) return true;
+    if ( _data == NULL ) return true;
 
     if ( _segment->getTrack() ) {
       if ( _data->getGCellOrder() < Session::getOrder() ) {
@@ -1764,6 +1774,8 @@ namespace {
       }
 
       placedPerpandiculars++;
+
+    // Try to ripup the perpandicular itself.
       DataNegociate* data2 = perpandiculars[i]->getDataNegociate();
       if ( data2->getGCellOrder() == Session::getOrder() ) {
         ltrace(200) << "| " << perpandiculars[i] << endl;
@@ -1771,11 +1783,13 @@ namespace {
         if (   (flags & Manipulator::ToMoveUp)
            and (data2->getState() < DataNegociate::MoveUp) )
           data2->setState ( DataNegociate::MoveUp );
-
-        Manipulator(perpandiculars[i],_S).ripup ( _event->getSegment()->getAxis(), perpandicularActionFlags );
-        continue;
+        
+        if ( Manipulator(perpandiculars[i],_S).ripup(_event->getSegment()->getAxis()
+                                                    ,perpandicularActionFlags) )
+          continue;
       }
 
+    // Cannot ripup the perpandicular, try to ripup it's neigbors.
       size_t begin;
       size_t end;
       track->getOverlapBounds ( constraints, begin, end );
@@ -1796,8 +1810,14 @@ namespace {
           continue;
         }
 
-        ltrace(200) << "  | Ripup: " << begin << " " << other << endl;
-        _S.addAction ( other, SegmentAction::OtherRipup );
+      // Try to ripup conflicting neighbor.
+        if ( Manipulator(other,_S).canRipup() ) {
+          ltrace(200) << "  | Ripup: " << begin << " " << other << endl;
+          _S.addAction ( other, SegmentAction::OtherRipup );
+        } else {
+          ltrace(200) << "Aborted ripup of perpandiculars, blocked by border/ring." << endl;
+          return false;
+        }
       }
     }
 
@@ -1808,7 +1828,7 @@ namespace {
     }
 
     if ( _segment->isLocal() and not placedPerpandiculars ) {
-      ltrace(200) << "No placed perpandiculars, tight native constraints." << endl;
+      ltrace(200) << "No placed perpandiculars, tight native constraints, place perpandiculars FIRST." << endl;
       for ( size_t i=0 ; i < perpandiculars.size() ; i++ ) {
         _S.addAction ( perpandiculars[i], perpandicularActionFlags|SegmentAction::EventLevel4 );
       }
@@ -1838,8 +1858,9 @@ namespace {
     ltrace(200) << "Manipulator::relax() of: " << _segment << " " << interval << endl; 
 
     if ( _segment->isFixed() ) return false;
-    if ( !interval.intersect(_segment->getCanonicalInterval()) ) return false;
-    if ( !_data ) return false;
+    if ( not interval.intersect(_segment->getCanonicalInterval()) ) return false;
+    if ( not _data ) return false;
+  //if ( _data->isBorder() or _data->isRing() ) return false;
 
     if (    _segment->isTerminal()
        and (_segment->getLayer() == Session::getRoutingGauge()->getRoutingLayer(1)) ) {
@@ -2323,7 +2344,8 @@ namespace {
 
         if ( not (shrinkLeft xor shrinkRight) ) {
           ltrace(200) << "- Hard overlap/enclosure/shrink " << segment2 << endl;
-          Manipulator(segment2,_S).ripup ( toFree, SegmentAction::OtherRipup );
+          if ( not (success = Manipulator(segment2,_S).ripup(toFree,SegmentAction::OtherRipup)) )
+            continue;
         }
 
         canonicals.clear ();
@@ -2344,11 +2366,13 @@ namespace {
 
           if ( shrinkRight xor shrinkLeft ) {
             if ( shrinkRight ) {
-              Manipulator(*isegment3,_S).ripup ( track->getAxis()
-                                               , SegmentAction::OtherPushAside
-                                               | SegmentAction::AxisHint
-                                               , toFree.getVMin() - DbU::lambda(1.0)
-                                               );
+              if ( not (success=Manipulator(*isegment3,_S).ripup ( track->getAxis()
+                                                                 , SegmentAction::OtherPushAside
+                                                                 | SegmentAction::AxisHint
+                                                                 , toFree.getVMin() - DbU::lambda(1.0)
+                                                                 )) )
+                break;
+
               if ( event3->getTracksFree() == 1 ) {
                 ltrace(200) << "Potential left intrication with other perpandicular." << endl;
                 if ( isegment3->getAxis() == segment2->getTargetU() - Session::getExtensionCap() ) {
@@ -2358,11 +2382,12 @@ namespace {
               }
             }
             if ( shrinkLeft  ) {
-              Manipulator(*isegment3,_S).ripup ( track->getAxis()
-                                               , SegmentAction::OtherPushAside
-                                               | SegmentAction::AxisHint
-                                               , toFree.getVMax() + DbU::lambda(1.0)
-                                               );
+              if ( not (success=Manipulator(*isegment3,_S).ripup ( track->getAxis()
+                                                                 , SegmentAction::OtherPushAside
+                                                                 | SegmentAction::AxisHint
+                                                                 , toFree.getVMax() + DbU::lambda(1.0)
+                                                                 )) )
+                break;
               if ( event3->getTracksFree() == 1 ) {
                 ltrace(200) << "Potential right intrication with other perpandicular." << endl;
                 if ( isegment3->getAxis() == segment2->getSourceU() + Session::getExtensionCap() ) {
@@ -2375,14 +2400,15 @@ namespace {
             // DbU::Unit axisHint
             //   = (event3->getAxisHint() - toFree.getVMin() < toFree.getVMax() - event3->getAxisHint()) 
             //   ? (toFree.getVMin() - DbU::lambda(1.0)) : (toFree.getVMax() + DbU::lambda(1.0));
-            Manipulator(*isegment3,_S).ripup
-              ( track->getAxis()
-              , SegmentAction::OtherRipup
-              | SegmentAction::EventLevel3
-            //| SegmentAction::AxisHint, axisHint
-              );
+            if ( not (success=Manipulator(*isegment3,_S).ripup ( track->getAxis()
+                                                               , SegmentAction::OtherRipup
+                                                               | SegmentAction::EventLevel3
+                                                             //| SegmentAction::AxisHint, axisHint
+                                                               )) )
+              break;
           }
         }
+        if ( not success ) break;
       }
     }
 
@@ -2442,7 +2468,8 @@ namespace {
         success = Manipulator(segment2,_S).relax ( toFree );
       } else {
         ltrace(200) << "- Forced ripup " << segment2 << endl;
-        Manipulator(segment2,_S).ripup ( toFree, SegmentAction::OtherRipup );
+        if ( not (success=Manipulator(segment2,_S).ripup(toFree,SegmentAction::OtherRipup)) )
+          continue;
 
         canonicals.clear ();
         forEach ( TrackElement*, isegment3
@@ -2453,7 +2480,8 @@ namespace {
           RoutingEvent* event3 = data3->getRoutingEvent();
           if ( !event3 ) continue;
 
-          _S.addAction ( *isegment3, SegmentAction::OtherRipup );
+          if ( Manipulator(*isegment3,_S).canRipup() )
+            _S.addAction ( *isegment3, SegmentAction::OtherRipup );
         }
       }
     }
@@ -2669,8 +2697,8 @@ namespace {
   {
     ltrace(200) << "Manipulator::pivotUp() " << _segment << endl; 
 
-    if (     _segment->isFixed  () ) return false;
-    if ( not _segment->canMoveUp() ) return false;
+    if (     _segment->isFixed  ()    ) return false;
+    if ( not _segment->canMoveUp(0.0) ) return false;
 
     _segment->moveUp ();
     return true;
@@ -2682,8 +2710,8 @@ namespace {
     ltrace(200) << "Manipulator::moveUp() " << _segment << endl; 
 
     if ( _segment->isFixed  () ) return false;
-    if ( _segment->isLocal() and not _segment->canPivotUp() ) return false;
-    if ( not _segment->canMoveUp() ) return false;
+    if ( _segment->isLocal() and not _segment->canPivotUp(0.0) ) return false;
+    if ( not _segment->canMoveUp(0.5) ) return false;
 
 #if DISABLED
     ltrace(200) << "| Repack Tracks: " << endl;
@@ -3306,7 +3334,8 @@ namespace Kite {
     if ( not isProcessed() ) {
       fork = this;
       ltrace(200) << "Reschedule/Self: "
-                  << (void*)this << " -> " << (void*)fork << ":" << fork << endl;
+                  << (void*)this << " -> "
+                  << (void*)fork << ":" << eventLevel << ":" << fork << endl;
     } else {
       fork = clone();
       fork->_processed  = false;
diff --git a/kite/src/TrackElement.cpp b/kite/src/TrackElement.cpp
index 8dcae766..fa3d6192 100644
--- a/kite/src/TrackElement.cpp
+++ b/kite/src/TrackElement.cpp
@@ -2,7 +2,7 @@
 // -*- C++ -*-
 //
 // This file is part of the Coriolis Software.
-// Copyright (c) UPMC/LIP6 2008-2009, All Rights Reserved
+// Copyright (c) UPMC/LIP6 2008-2010, All Rights Reserved
 //
 // ===================================================================
 //
@@ -176,8 +176,8 @@ namespace Kite {
 
 
   bool           TrackElement::canDesalignate             () const { return false; }
-  bool           TrackElement::canPivotUp                 () const { return false; };
-  bool           TrackElement::canMoveUp                  () const { return false; };
+  bool           TrackElement::canPivotUp                 ( float ) const { return false; };
+  bool           TrackElement::canMoveUp                  ( float ) const { return false; };
   bool           TrackElement::canDogLeg                  () { return false; };
   bool           TrackElement::canDogLeg                  ( Interval ) { return false; };
   bool           TrackElement::canDogLegAt                ( GCell*, bool allowReuse ) { return false; };
diff --git a/kite/src/TrackFixedSegment.cpp b/kite/src/TrackFixedSegment.cpp
index 3fb98c70..8c9caf1a 100644
--- a/kite/src/TrackFixedSegment.cpp
+++ b/kite/src/TrackFixedSegment.cpp
@@ -89,12 +89,15 @@ namespace Kite {
       if ( layer2 ) {
         DbU::Unit extention = layer2->getExtentionCap();
         if ( track->getDirection() == Constant::Horizontal ) {
-          _sourceU = boundingBox.getXMin()-extention;
-          _targetU = boundingBox.getXMax()+extention;
+          Interval uside = track->getKiteEngine()->getGCellGrid()->getUSide ( Constant::Horizontal );
+
+          _sourceU = max ( boundingBox.getXMin()-extention, uside.getVMin());
+          _targetU = min ( boundingBox.getXMax()+extention, uside.getVMax());
 
           GCell* gcell = track->getKiteEngine()->getGCellGrid()->getGCell ( Point(_sourceU,track->getAxis()) );
           GCell* end   = track->getKiteEngine()->getGCellGrid()->getGCell ( Point(_targetU,track->getAxis()) );
           GCell* right = NULL;
+
           if ( gcell ) {
             while ( gcell and (gcell != end) ) {
               right = gcell->getRight();
@@ -106,8 +109,10 @@ namespace Kite {
           } else
             cerr << Warning("TrackFixedSegment(): TrackFixedElement outside GCell grid.") << endl;
         } else {
-          _sourceU = boundingBox.getYMin()-extention;
-          _targetU = boundingBox.getYMax()+extention;
+          Interval uside = track->getKiteEngine()->getGCellGrid()->getUSide ( Constant::Vertical );
+
+          _sourceU = max ( boundingBox.getYMin()-extention, uside.getVMin());
+          _targetU = min ( boundingBox.getYMax()+extention, uside.getVMax());
 
           GCell* gcell = track->getKiteEngine()->getGCellGrid()->getGCell ( Point(track->getAxis(),_sourceU) );
           GCell* end   = track->getKiteEngine()->getGCellGrid()->getGCell ( Point(track->getAxis(),_targetU) );
diff --git a/kite/src/TrackSegment.cpp b/kite/src/TrackSegment.cpp
index 59ccf8e7..f017dd9d 100644
--- a/kite/src/TrackSegment.cpp
+++ b/kite/src/TrackSegment.cpp
@@ -609,19 +609,19 @@ namespace Kite {
   }
 
 
-  bool  TrackSegment::canPivotUp () const
+  bool  TrackSegment::canPivotUp ( float reserve ) const
   {
-    return _base->canPivotUp();
+    return _base->canPivotUp(reserve);
   }
 
 
-  bool  TrackSegment::canMoveUp () const
+  bool  TrackSegment::canMoveUp ( float reserve ) const
   {
     // if ( isLocal() /*and (hasSourceDogLeg() or hasTargetDogLeg())*/ ) {
     //   return _base->canPivotUp();
     // }
 
-    return _base->canMoveUp ( true );
+    return _base->canMoveUp ( true, reserve );
   }
 
 
@@ -645,8 +645,11 @@ namespace Kite {
       vector<TrackElement*> segments;
       for ( size_t i=0 ; i<invalidateds.size() ; i++ ) {
         ltrace(200) << "moved: " << invalidateds[i] << endl;
-        segments.push_back ( GCell::addTrackSegment(NULL,invalidateds[i],false) );
-        segments.back()->reschedule ( 0 );
+        TrackElement* segment = GCell::addTrackSegment(NULL,invalidateds[i],false);
+        segments.push_back ( segment );
+        // if (  (segment->getTrack() == NULL)
+        //    or (segment->getLayer() != segment->getTrack()->getLayer()) )
+        segment->reschedule ( 0 );
       }
 
       for ( size_t i=0 ; i<segments.size() ; i++ ) {
@@ -1198,11 +1201,13 @@ namespace Kite {
               +  " "   + getString(_dogLegLevel)
               +  " o:" + getString(_data->getGCellOrder())
               + " ["   + ((_track) ? getString(_index) : "npos") + "] "
-              + ((isSlackened()) ? "S" : "-")
-              + ((_track       ) ? "T" : "-")
-              + ((_canRipple   ) ? "r" : "-")
-              + ((_sourceDogLeg) ? "s" : "-")
-              + ((_targetDogLeg) ? "t" : "-");
+              + ((isSlackened()    ) ? "S" : "-")
+              + ((_track           ) ? "T" : "-")
+              + ((_canRipple       ) ? "r" : "-")
+              + ((_data->isBorder()) ? "B" : "-")
+              + ((_data->isRing  ()) ? "R" : "-")
+              + ((_sourceDogLeg    ) ? "s" : "-")
+              + ((_targetDogLeg    ) ? "t" : "-");
 
     s1.insert ( s1.size()-1, s2 );
 
diff --git a/kite/src/kite/Configuration.h b/kite/src/kite/Configuration.h
index 6809a5ec..a7842119 100644
--- a/kite/src/kite/Configuration.h
+++ b/kite/src/kite/Configuration.h
@@ -2,7 +2,7 @@
 // -*- C++ -*-
 //
 // This file is part of the Coriolis Software.
-// Copyright (c) UPMC/LIP6 2008-2009, All Rights Reserved
+// Copyright (c) UPMC/LIP6 2008-2010, All Rights Reserved
 //
 // ===================================================================
 //
@@ -78,10 +78,12 @@ namespace Kite {
     // Methods.
       inline  Katabatic::Configuration*  base                   ();
       inline  PostEventCb_t&             getPostEventCb         ();
+      inline  unsigned long              getEventsLimit         () const;
       inline  float                      getExpandStep          () const;
       inline  unsigned int               getRipupCost           () const;
               unsigned int               getRipupLimit          ( unsigned int type ) const;
       inline  float                      getEdgeCapacityPercent () const;
+      inline  void                       setEventsLimit         ( unsigned long );
       inline  void                       setExpandStep          ( float );
       inline  void                       setRipupCost           ( unsigned int );
               void                       setRipupLimit          ( unsigned int type, unsigned int limit );
@@ -101,6 +103,7 @@ namespace Kite {
              float                       _expandStep;
              unsigned int                _ripupLimits[RipupLimitsTableSize];
              unsigned int                _ripupCost;
+             unsigned long               _eventsLimit;
     private:
                      Configuration ( const Configuration& );
       Configuration& operator=     ( const Configuration& );
@@ -110,12 +113,14 @@ namespace Kite {
 // Inline Functions.
   inline Katabatic::Configuration*     Configuration::base                   () { return _base; }
   inline Configuration::PostEventCb_t& Configuration::getPostEventCb         () { return _postEventCb; }
+  inline unsigned long                 Configuration::getEventsLimit         () const { return _eventsLimit; }
   inline unsigned int                  Configuration::getRipupCost           () const { return _ripupCost; }
   inline float                         Configuration::getExpandStep          () const { return _expandStep; }
   inline float                         Configuration::getEdgeCapacityPercent () const { return _edgeCapacityPercent; }
   inline void                          Configuration::setRipupCost           ( unsigned int cost ) { _ripupCost = cost; }
   inline void                          Configuration::setExpandStep          ( float step ) { _expandStep = step; }
   inline void                          Configuration::setPostEventCb         ( PostEventCb_t cb ) { _postEventCb = cb; }
+  inline void                          Configuration::setEventsLimit         ( unsigned long limit ) { _eventsLimit = limit; }
   inline void                          Configuration::setEdgeCapacityPercent ( float percent ) { _edgeCapacityPercent = percent; }
 
 
diff --git a/kite/src/kite/DataNegociate.h b/kite/src/kite/DataNegociate.h
index 41cd11b7..45660684 100644
--- a/kite/src/kite/DataNegociate.h
+++ b/kite/src/kite/DataNegociate.h
@@ -105,6 +105,7 @@ namespace Kite {
       inline void              incRipupCount     ();
       inline void              decRipupCount     ();
       inline void              resetRipupCount   ();
+      inline void              resetStateCount   ();
       inline void              invalidate        ( bool withPerpandiculars=false, bool withConstraints=false );
              void              update            ();
       static string            getStateString    ( DataNegociate* );
@@ -156,6 +157,7 @@ namespace Kite {
   inline void              DataNegociate::incRipupCount     () { _cost.incRipupCount(); }
   inline void              DataNegociate::decRipupCount     () { _cost.decRipupCount(); }
   inline void              DataNegociate::resetRipupCount   () { _cost.resetRipupCount(); }
+  inline void              DataNegociate::resetStateCount   () { _stateCount=0; }
   inline string            DataNegociate::_getTypeName      () const { return "DataNegociate"; }
 
   inline void  DataNegociate::invalidate ( bool withPerpandiculars, bool withConstraints )
diff --git a/kite/src/kite/GCellGrid.h b/kite/src/kite/GCellGrid.h
index dfff89dd..621a4791 100644
--- a/kite/src/kite/GCellGrid.h
+++ b/kite/src/kite/GCellGrid.h
@@ -54,6 +54,7 @@ namespace Kite {
       inline  Katabatic::GCellGrid* base                ();
       inline  KiteEngine*           getKite             ();
               Cell*                 getCell             () const;
+      inline  Interval              getUSide            ( unsigned int ) const;
       inline  bool                  checkEdgeSaturation ( float threshold ) const;
               void                  updateContacts      ( bool openSession=true );
               void                  updateDensity       ();
@@ -82,6 +83,9 @@ namespace Kite {
   inline  Katabatic::GCellGrid* GCellGrid::base                () { return _kite->base()->getGCellGrid(); }
   inline  KiteEngine*           GCellGrid::getKite             () { return _kite; };
 
+  inline  Interval  GCellGrid::getUSide ( unsigned int dir ) const
+  { return const_cast<GCellGrid*>(this)->base()->getUSide(dir); }
+
   inline  bool  GCellGrid::checkEdgeSaturation ( float threshold ) const
   { return const_cast<GCellGrid*>(this)->base()->checkEdgeSaturation(threshold); }
 
diff --git a/kite/src/kite/KiteEngine.h b/kite/src/kite/KiteEngine.h
index 27f659d1..f7280619 100644
--- a/kite/src/kite/KiteEngine.h
+++ b/kite/src/kite/KiteEngine.h
@@ -86,6 +86,7 @@ namespace Kite {
       inline  Net*             getBlockageNet             ();
       virtual Configuration*   getConfiguration           ();
       inline  bool             getToolSuccess             () const;
+      inline  unsigned long    getEventsLimit             () const;
       inline  unsigned int     getRipupLimit              ( unsigned int type ) const;
               unsigned int     getRipupLimit              ( const TrackElement* ) const;
       inline  unsigned int     getRipupCost               () const;
@@ -104,6 +105,7 @@ namespace Kite {
               void             dumpMeasures               ( std::ostream& ) const;
               void             dumpMeasures               () const;
       inline  void             setPostEventCb             ( Configuration::PostEventCb_t );
+      inline  void             setEventLimit              ( unsigned long );
       inline  void             setMinimumWL               ( double );
       inline  void             setRipupLimit              ( unsigned int, unsigned int type );
       inline  void             setRipupCost               ( unsigned int );
@@ -167,6 +169,7 @@ namespace Kite {
   inline  Net*                          KiteEngine::getBlockageNet         () { return _obstacleNet; }
   inline  Configuration::PostEventCb_t& KiteEngine::getPostEventCb         () { return _configuration.getPostEventCb(); }
   inline  bool                          KiteEngine::getToolSuccess         () const { return _toolSuccess; }
+  inline  unsigned long                 KiteEngine::getEventsLimit         () const { return _configuration.getEventsLimit(); }
   inline  unsigned int                  KiteEngine::getRipupCost           () const { return _configuration.getRipupCost(); }
   inline  float                         KiteEngine::getExpandStep          () const { return _configuration.getExpandStep(); }
   inline  float                         KiteEngine::getEdgeCapacityPercent () const { return _configuration.getEdgeCapacityPercent(); }
@@ -174,6 +177,7 @@ namespace Kite {
   inline  GCellGrid*                    KiteEngine::getGCellGrid           () const { return _kiteGrid; }
   inline  NegociateWindow*              KiteEngine::getNegociateWindow     () { return _negociateWindow; }
   inline  size_t                        KiteEngine::getRoutingPlanesSize   () const { return _routingPlanes.size(); }
+  inline  void                          KiteEngine::setEventLimit          ( unsigned long limit ) { _configuration.setEventsLimit(limit); }
   inline  void                          KiteEngine::setRipupLimit          ( unsigned int limit, unsigned int type ) { _configuration.setRipupLimit(limit,type); }
   inline  void                          KiteEngine::setRipupCost           ( unsigned int cost ) { _configuration.setRipupCost(cost); }
   inline  void                          KiteEngine::setExpandStep          ( float step ) { _configuration.setExpandStep(step); }
diff --git a/kite/src/kite/TrackElement.h b/kite/src/kite/TrackElement.h
index 4f9449ac..23c5ae3c 100644
--- a/kite/src/kite/TrackElement.h
+++ b/kite/src/kite/TrackElement.h
@@ -3,7 +3,7 @@
 // -*- C++ -*-
 //
 // This file is part of the Coriolis Software.
-// Copyright (c) UPMC/LIP6 2008-2009, All Rights Reserved
+// Copyright (c) UPMC/LIP6 2008-2010, All Rights Reserved
 //
 // ===================================================================
 //
@@ -115,8 +115,8 @@ namespace Kite {
       virtual bool                  canDesalignate             () const;
       virtual bool                  canGoOutsideGCell          () const;
       virtual bool                  canSlacken                 () const;
-      virtual bool                  canPivotUp                 () const;
-      virtual bool                  canMoveUp                  () const;
+      virtual bool                  canPivotUp                 ( float reserve ) const;
+      virtual bool                  canMoveUp                  ( float reserve ) const;
       virtual bool                  canRipple                  () const;
       virtual bool                  hasSourceDogLeg            () const;
       virtual bool                  hasTargetDogLeg            () const;
diff --git a/kite/src/kite/TrackSegment.h b/kite/src/kite/TrackSegment.h
index e8277a47..efb9e0cd 100644
--- a/kite/src/kite/TrackSegment.h
+++ b/kite/src/kite/TrackSegment.h
@@ -78,8 +78,8 @@ namespace Kite {
       virtual bool                  canDesalignate             () const;
       virtual bool                  canGoOutsideGCell          () const;
       virtual bool                  canSlacken                 () const;
-      virtual bool                  canPivotUp                 () const;
-      virtual bool                  canMoveUp                  () const;
+      virtual bool                  canPivotUp                 ( float reserve ) const;
+      virtual bool                  canMoveUp                  ( float reserve ) const;
       virtual bool                  canRipple                  () const;
       virtual bool                  hasSourceDogLeg            () const;
       virtual bool                  hasTargetDogLeg            () const;