diff --git a/anabatic/src/AnabaticEngine.cpp b/anabatic/src/AnabaticEngine.cpp
index 488eb766..7b3b1529 100644
--- a/anabatic/src/AnabaticEngine.cpp
+++ b/anabatic/src/AnabaticEngine.cpp
@@ -18,6 +18,7 @@
 #include <iostream>
 #include "hurricane/Bug.h"
 #include "hurricane/Error.h"
+#include "hurricane/Breakpoint.h"
 #include "hurricane/RegularLayer.h"
 #include "hurricane/Horizontal.h"
 #include "hurricane/RoutingPad.h"
@@ -38,6 +39,7 @@ namespace Anabatic {
   using std::ostringstream;
   using Hurricane::Bug;
   using Hurricane::Error;
+  using Hurricane::Breakpoint;
   using Hurricane::RegularLayer;
   using Hurricane::Component;
   using Hurricane::Horizontal;
@@ -554,6 +556,7 @@ namespace Anabatic {
 
   void  AnabaticEngine::ripup ( Segment* seed, Flags flags )
   {
+
     Net* net = seed->getNet();
 
     DebugSession::open( net, 112, 120 );
@@ -614,6 +617,8 @@ namespace Anabatic {
 
       Contact* source = dynamic_cast<Contact*>( segment->getSource() );
       Contact* target = dynamic_cast<Contact*>( segment->getTarget() );
+      segment->getSourceHook()->detach();
+      segment->getTargetHook()->detach();
       segment->destroy();
       bool deletedSource = gcells->gcellAt( 0                )->unrefContact( source );
       bool deletedTarget = gcells->gcellAt( gcells->size()-1 )->unrefContact( target );
@@ -635,7 +640,7 @@ namespace Anabatic {
 
     getNetData( net )->setGlobalRouted( false );
 
-    cdebug_tabw(111,-1);
+    cdebug_tabw(112,-1);
     DebugSession::close();
   }
 
diff --git a/anabatic/src/Configuration.cpp b/anabatic/src/Configuration.cpp
index e6df4f18..9cdf0b86 100644
--- a/anabatic/src/Configuration.cpp
+++ b/anabatic/src/Configuration.cpp
@@ -78,6 +78,7 @@ namespace Anabatic {
     , _edgeWidth      (DbU::fromLambda(Cfg::getParamInt("anabatic.edgeWidth" , 4)->asInt()))
     , _edgeCostH      (Cfg::getParamDouble("anabatic.edgeCostH",  9.0)->asDouble())
     , _edgeCostK      (Cfg::getParamDouble("anabatic.edgeCostK",-10.0)->asDouble())
+    , _edgeHInc       (Cfg::getParamDouble("anabatic.edgeHInc" , 1.5)->asDouble())
     , _hEdgeLocal     (Cfg::getParamInt("kite.hTracksReservedLocal",0)->asInt())
     , _vEdgeLocal     (Cfg::getParamInt("kite.vTracksReservedLocal",0)->asInt())
   {
@@ -131,6 +132,7 @@ namespace Anabatic {
     , _allowedDepth   (other._allowedDepth)
     , _edgeCostH      (other._edgeCostH)
     , _edgeCostK      (other._edgeCostK)
+    , _edgeHInc       (other._edgeHInc)
   {
     if (other._cg) _cg = other._cg->getClone();
     if (other._rg) _rg = other._rg->getClone();
@@ -335,6 +337,9 @@ namespace Anabatic {
   { return _edgeCostK; }
 
 
+  float  ConfigurationConcrete::getEdgeHInc () const
+  { return _edgeHInc; }
+
 
   void  ConfigurationConcrete::print ( Cell* cell ) const
   {
diff --git a/anabatic/src/Dijkstra.cpp b/anabatic/src/Dijkstra.cpp
index f6ff0c47..be1b1a90 100644
--- a/anabatic/src/Dijkstra.cpp
+++ b/anabatic/src/Dijkstra.cpp
@@ -172,17 +172,18 @@ namespace Anabatic {
 
 
   Dijkstra::Dijkstra ( AnabaticEngine* anabatic )
-    : _anabatic    (anabatic)
-    , _vertexes    ()
-    , _distanceCb  (_distance)
-    , _mode        (Mode::Standart)
-    , _net         (NULL)
-    , _stamp       (-1)
-    , _sources     ()
-    , _targets     ()
-    , _searchArea  ()
-    , _connectedsId(-1)
-    , _queue       ()
+    : _anabatic      (anabatic)
+    , _vertexes      ()
+    , _distanceCb    (_distance)
+    , _mode          (Mode::Standart)
+    , _net           (NULL)
+    , _stamp         (-1)
+    , _sources       ()
+    , _targets       ()
+    , _searchArea    ()
+    , _searchAreaHalo(0)
+    , _connectedsId  (-1)
+    , _queue         ()
   {
     const vector<GCell*>& gcells = _anabatic->getGCells();
     for ( GCell* gcell : gcells ) {
@@ -216,6 +217,8 @@ namespace Anabatic {
     for ( auto rp : rps ) {
       Point  center = rp->getBoundingBox().getCenter();
       GCell* gcell  = _anabatic->getGCellUnder( center );
+
+      cdebug_log(112,0) << "| " << rp << endl;
         
       if (not gcell) {
         cerr << Error( "Dijkstra::load(): %s of %s is not under any GCell.\n"
@@ -244,7 +247,7 @@ namespace Anabatic {
           vertex->setFrom         ( NULL );
           vertex->clearRestriction();
           _targets.insert( vertex );
-          cdebug_log(112,0) << "Add Vertex: " << vertex << endl;
+          cdebug_log(112,0) << "| Add: " << vertex << endl;
         }
       }
 
@@ -254,6 +257,7 @@ namespace Anabatic {
       rp->getBodyHook()->attach( vcontact->getBodyHook() );
     }
 
+    _searchArea.inflate( _searchAreaHalo );
     cdebug_log(112,0) << "Search area: " << _searchArea << endl;
     cdebug_tabw(112,-1);
     DebugSession::close();
diff --git a/anabatic/src/Edge.cpp b/anabatic/src/Edge.cpp
index f3dab89d..7b07d390 100644
--- a/anabatic/src/Edge.cpp
+++ b/anabatic/src/Edge.cpp
@@ -39,6 +39,7 @@ namespace Anabatic {
     , _capacity         (0)
     , _realOccupancy    (0)
     , _estimateOccupancy(0.0)
+    , _historicCost     (0.0)
     , _source           (source)
     , _target           (target)
     , _axis             (0)
@@ -299,6 +300,7 @@ namespace Anabatic {
     s.insert( s.size()-1, " "+DbU::getValueString(_axis) );
     s.insert( s.size()-1, " "+getString(_realOccupancy) );
     s.insert( s.size()-1, "/"+getString(_capacity) );
+    s.insert( s.size()-1, " h:"+getString(_historicCost) );
     s.insert( s.size()-1, " "+getString(_flags) );
     return s;
   }
diff --git a/anabatic/src/GCell.cpp b/anabatic/src/GCell.cpp
index 5446b334..0985af40 100644
--- a/anabatic/src/GCell.cpp
+++ b/anabatic/src/GCell.cpp
@@ -594,7 +594,7 @@ namespace Anabatic {
 
   GCell*  GCell::vcut ( DbU::Unit x )
   {
-    cdebug_log(119,1) << "GCell::vcut() @x:" << DbU::getValueString(x) << " " << this << endl;
+    cdebug_log(110,1) << "GCell::vcut() @x:" << DbU::getValueString(x) << " " << this << endl;
 
     if ( (x < getXMin()) or (x > getXMax()) )
       throw Error( "GCell::vcut(): Vertical cut axis at %s is outside GCell box,\n"
@@ -604,7 +604,7 @@ namespace Anabatic {
                  );
 
     GCell* chunk = _create( x, getYMin() );
-    cdebug_log(119,0) << "New chunk:" << chunk << endl;
+    cdebug_log(110,0) << "New chunk:" << chunk << endl;
 
     _moveEdges( chunk, 0, Flags::EastSide );
     Edge::create( this, chunk, Flags::Horizontal );
@@ -646,7 +646,7 @@ namespace Anabatic {
     _revalidate();
     chunk->_revalidate();
 
-    cdebug_tabw(119,-1);
+    cdebug_tabw(110,-1);
 
     return chunk;
   }
@@ -654,7 +654,7 @@ namespace Anabatic {
 
   GCell* GCell::hcut ( DbU::Unit y )
   {
-    cdebug_log(119,1) << "GCell::hcut() @y:" << DbU::getValueString(y) << " " << this << endl;
+    cdebug_log(110,1) << "GCell::hcut() @y:" << DbU::getValueString(y) << " " << this << endl;
 
     if ( (y < getYMin()) or (y > getYMax()) )
       throw Error( "GCell::hcut(): Horizontal cut axis at %s is outside GCell box,\n"
@@ -664,7 +664,7 @@ namespace Anabatic {
                  );
 
     GCell* chunk = _create( getXMin(), y );
-    cdebug_log(119,0) << "New chunk:" << chunk << endl;
+    cdebug_log(110,0) << "New chunk:" << chunk << endl;
 
     _moveEdges( chunk, 0, Flags::NorthSide );
     Edge::create( this, chunk, Flags::Vertical );
@@ -698,7 +698,7 @@ namespace Anabatic {
     _revalidate();
     chunk->_revalidate();
 
-    cdebug_tabw(119,-1);
+    cdebug_tabw(110,-1);
 
     return chunk;
   }
diff --git a/anabatic/src/GlobalRoute.cpp b/anabatic/src/GlobalRoute.cpp
index e71a7b08..4a366524 100644
--- a/anabatic/src/GlobalRoute.cpp
+++ b/anabatic/src/GlobalRoute.cpp
@@ -63,7 +63,9 @@ namespace {
     float congestion     = (float)edge->getRealOccupancy() / (float)edge->getCapacity();
     float congestionCost = 1.0 + _h / (1.0 + std::exp(_k * (congestion - 1.0)));
 
-    float distance = (float)source->getDistance() + congestionCost * (float)edge->getDistance();
+    float distance = (float)source->getDistance()
+                   + congestionCost * (float)edge->getDistance();
+                   + edge->getHistoricCost();
 
     // Edge* sourceFrom = source->getFrom();
     // if (sourceFrom) {
@@ -77,6 +79,19 @@ namespace {
   }
 
 
+  void  computeNextHCost ( Edge* edge, float edgeHInc )
+  {
+    float congestion = (float)edge->getRealOccupancy() / (float)edge->getCapacity();
+    float hCost      = edge->getHistoricCost();
+
+    float alpha = (congestion < 1.0) ? congestion : std::exp( std::log(8)*( congestion - 1 ) );
+
+    edge->setHistoricCost( alpha * (hCost + ((congestion < 1.0) ? 0.0 : edgeHInc) ));
+
+    cdebug_log(113,0) << edge << endl;
+  }
+
+
 }  // Anonymous namespace.
 
 
@@ -119,6 +134,7 @@ namespace Anabatic {
   //DebugSession::addToTrace( cell->getNet("a_from_pads(0)") );
   //DebugSession::addToTrace( cell->getNet("ialu.not_aux104") );
   //DebugSession::addToTrace( cell->getNet("mips_r3000_1m_dp_shift32_rshift_se_muxoutput(159)") );
+  //DebugSession::addToTrace( cell->getNet("mips_r3000_1m_dp_shift32_rshift_se_c1(3)") );
 
     startMeasures();
 
@@ -145,7 +161,9 @@ namespace Anabatic {
 
     cmess1 << "  o  Running global routing..." << endl;
 
-    UpdateSession::open();
+    float edgeHInc = getConfiguration()->getEdgeHInc();
+
+    Session::open( this );
     Dijkstra* dijkstra = new Dijkstra ( this );
     dijkstra->setDistance( DigitalDistance( getConfiguration()->getEdgeCostH()
                                           , getConfiguration()->getEdgeCostK() ) );
@@ -165,9 +183,13 @@ namespace Anabatic {
       }
       cmess2 << left << setw(6) << netCount << right;
 
+    //Session::revalidate();
+
       const vector<Edge*>& ovEdges = getOvEdges();
       cmess2 << " ovEdges:" << ovEdges.size();
 
+      for ( Edge* edge : ovEdges ) computeNextHCost( edge, edgeHInc );
+
       netCount = 0;
       while ( not ovEdges.empty() ) {
         Edge*   ovEdge = ovEdges[0];
@@ -181,8 +203,9 @@ namespace Anabatic {
         }
       }
 
-      cmess2 << " ripup:" << netCount;
+      dijkstra->setSearchAreaHalo( Session::getSliceHeight()*3 );
 
+      cmess2 << " ripup:" << netCount;
       stopMeasures();
       cmess2 << " " << setw(10) << Timer::getStringTime  (_timer.getCombTime())
              << " " << setw( 6) << Timer::getStringMemory(_timer.getIncrease()) << endl;
@@ -218,7 +241,7 @@ namespace Anabatic {
     printMeasures( "Dijkstra" );
 
     delete dijkstra;
-    UpdateSession::close();
+    Session::close();
 
     _state = EngineGlobalLoaded;
   }
diff --git a/anabatic/src/anabatic/Configuration.h b/anabatic/src/anabatic/Configuration.h
index 20339aeb..f293817d 100644
--- a/anabatic/src/anabatic/Configuration.h
+++ b/anabatic/src/anabatic/Configuration.h
@@ -94,6 +94,7 @@ namespace Anabatic {
       virtual DbU::Unit          getEdgeWidth        () const = 0;
       virtual float              getEdgeCostH        () const = 0;
       virtual float              getEdgeCostK        () const = 0;
+      virtual float              getEdgeHInc         () const = 0;
       virtual size_t             getHEdgeLocal       () const = 0;
       virtual size_t             getVEdgeLocal       () const = 0;
       virtual void               print               ( Cell* ) const = 0;
@@ -157,6 +158,7 @@ namespace Anabatic {
       virtual DbU::Unit              getEdgeWidth          () const;
       virtual float                  getEdgeCostH          () const;
       virtual float                  getEdgeCostK          () const;
+      virtual float                  getEdgeHInc           () const;
       virtual size_t                 getHEdgeLocal         () const;
       virtual size_t                 getVEdgeLocal         () const;
       virtual void                   print                 ( Cell* ) const;
@@ -179,6 +181,7 @@ namespace Anabatic {
       DbU::Unit               _edgeWidth;
       float                   _edgeCostH;
       float                   _edgeCostK;
+      float                   _edgeHInc;
       size_t                  _hEdgeLocal;
       size_t                  _vEdgeLocal;
     private:
diff --git a/anabatic/src/anabatic/Dijkstra.h b/anabatic/src/anabatic/Dijkstra.h
index 845b8dc6..027359d7 100644
--- a/anabatic/src/anabatic/Dijkstra.h
+++ b/anabatic/src/anabatic/Dijkstra.h
@@ -293,7 +293,9 @@ namespace Anabatic {
       inline bool       isBipoint          () const;
       inline bool       isSourceVertex     ( Vertex* ) const;
       inline bool       isTargetVertex     ( Vertex* ) const;
+      inline DbU::Unit  getSearchAreaHalo  () const;
       inline void       setDistance        ( distance_t );
+      inline void       setSearchAreaHalo  ( DbU::Unit );
              void       load               ( Net* );
              void       run                ( Mode mode=Mode::Standart );
     private:           
@@ -319,6 +321,7 @@ namespace Anabatic {
       VertexSet        _sources;
       VertexSet        _targets;
       Box              _searchArea;
+      DbU::Unit        _searchAreaHalo;
       int              _connectedsId;
       PriorityQueue    _queue;
   };
@@ -327,10 +330,12 @@ namespace Anabatic {
   inline Dijkstra::Mode::Mode ( unsigned int flags ) : BaseFlags(flags) { }
   inline Dijkstra::Mode::Mode ( BaseFlags    base  ) : BaseFlags(base)  { }
 
-  inline bool  Dijkstra::isBipoint      () const { return _net and (_targets.size()+_sources.size() == 2); }
-  inline bool  Dijkstra::isSourceVertex ( Vertex* v ) const { return (_sources.find(v) != _sources.end()); }
-  inline bool  Dijkstra::isTargetVertex ( Vertex* v ) const { return (_targets.find(v) != _targets.end()); }
-  inline void  Dijkstra::setDistance    ( distance_t cb ) { _distanceCb = cb; }
+  inline bool       Dijkstra::isBipoint         () const { return _net and (_targets.size()+_sources.size() == 2); }
+  inline bool       Dijkstra::isSourceVertex    ( Vertex* v ) const { return (_sources.find(v) != _sources.end()); }
+  inline bool       Dijkstra::isTargetVertex    ( Vertex* v ) const { return (_targets.find(v) != _targets.end()); }
+  inline DbU::Unit  Dijkstra::getSearchAreaHalo () const { return _searchAreaHalo; }
+  inline void       Dijkstra::setDistance       ( distance_t cb ) { _distanceCb = cb; }
+  inline void       Dijkstra::setSearchAreaHalo ( DbU::Unit halo ) { _searchAreaHalo = halo; }
 
 
 }  // Anabatic namespace.
diff --git a/anabatic/src/anabatic/Edge.h b/anabatic/src/anabatic/Edge.h
index 07fb5032..912f8c34 100644
--- a/anabatic/src/anabatic/Edge.h
+++ b/anabatic/src/anabatic/Edge.h
@@ -62,6 +62,7 @@ namespace Anabatic {
       inline        unsigned int      getCapacity          () const;
       inline        unsigned int      getRealOccupancy     () const;
       inline        unsigned int      getEstimateOccupancy () const;
+      inline        float             getHistoricCost      () const;
                     DbU::Unit         getDistance          () const;
       inline        GCell*            getSource            () const;
       inline        GCell*            getTarget            () const;
@@ -74,6 +75,7 @@ namespace Anabatic {
       inline const  vector<Segment*>& getSegments          () const;
       inline        void              incCapacity          ( int );
                     void              incRealOccupancy     ( int );
+      inline        void              setHistoricCost      ( float );
                     void              add                  ( Segment* );
                     void              remove               ( Segment* );
                     void              replace              ( Segment* orig, Segment* repl );
@@ -110,6 +112,7 @@ namespace Anabatic {
               unsigned int      _capacity;
               unsigned int      _realOccupancy;
               float             _estimateOccupancy;
+              float             _historicCost;
               GCell*            _source;
               GCell*            _target;
               DbU::Unit         _axis;
@@ -124,11 +127,13 @@ namespace Anabatic {
   inline       unsigned int      Edge::getCapacity          () const { return _capacity; }
   inline       unsigned int      Edge::getRealOccupancy     () const { return _realOccupancy; }
   inline       unsigned int      Edge::getEstimateOccupancy () const { return _estimateOccupancy; }
+  inline       float             Edge::getHistoricCost      () const { return _historicCost; }
   inline       GCell*            Edge::getSource            () const { return _source; }
   inline       GCell*            Edge::getTarget            () const { return _target; }
   inline       DbU::Unit         Edge::getAxis              () const { return _axis; }
   inline const vector<Segment*>& Edge::getSegments          () const { return _segments; }
   inline       void              Edge::incCapacity          ( int delta ) { _capacity = ((int)_capacity+delta > 0) ? _capacity+delta : 0; }
+  inline       void              Edge::setHistoricCost      ( float hcost ) { _historicCost = hcost; }
   inline const Flags&            Edge::flags                () const { return _flags; }
   inline       Flags&            Edge::flags                () { return _flags; }
   inline       void              Edge::revalidate           () const { /*if (_flags&Flags::Invalidated)*/ const_cast<Edge*>(this)->_revalidate(); }