diff --git a/examples/smtbmc/glift/C7552.ys b/examples/smtbmc/glift/C7552.ys
index c1fdf244e..a9a1f5dc2 100644
--- a/examples/smtbmc/glift/C7552.ys
+++ b/examples/smtbmc/glift/C7552.ys
@@ -26,11 +26,7 @@ delete uut spec
 techmap
 opt
 stat miter
-abc -script +print_stats;strash;print_stats;drwsat;print_stats;print_stats;fraig;print_stats;dc2,-l,-b;print_stats;irw,-l,-z;print_stats;refactor,-N,15,-z;print_stats;dch,-S,50000,-C,10000;print_stats;dc2,-l;print_stats;fraig,-C,10000;print_stats miter
-techmap
-opt
-stat
-qbfsat -dump-final-smt2 /tmp/test.smt2 -write-solution C7552.soln -solver yices -timeout 3600 -nocleanup -assume-outputs -assume-negative-polarity -specialize miter
+qbfsat -O2 -write-solution C7552.soln -solver yices -timeout 3600 -nocleanup -assume-outputs -assume-negative-polarity miter
 design -pop
 stat
 
diff --git a/examples/smtbmc/glift/C880.ys b/examples/smtbmc/glift/C880.ys
index 9a5e7bdcd..410768f21 100644
--- a/examples/smtbmc/glift/C880.ys
+++ b/examples/smtbmc/glift/C880.ys
@@ -26,11 +26,7 @@ delete uut spec
 techmap
 opt
 stat miter
-abc -script +print_stats;strash;print_stats;drwsat;print_stats;print_stats;fraig;print_stats;dc2,-l,-b;print_stats;irw,-l,-z;print_stats;refactor,-N,15,-z;print_stats;dch,-S,50000,-C,10000;print_stats;dc2,-l;print_stats;fraig,-C,10000;print_stats miter
-techmap
-opt
-stat
-qbfsat -dump-final-smt2 /tmp/test.smt2 -write-solution C880.soln -solver yices -timeout 3600 -nocleanup -assume-outputs -assume-negative-polarity -specialize miter
+qbfsat -O2 -write-solution C880.soln -solver yices -timeout 3600 -nocleanup -assume-outputs -assume-negative-polarity miter
 design -pop
 stat
 
diff --git a/examples/smtbmc/glift/alu2.ys b/examples/smtbmc/glift/alu2.ys
index f79c33ca5..b1671752e 100644
--- a/examples/smtbmc/glift/alu2.ys
+++ b/examples/smtbmc/glift/alu2.ys
@@ -26,11 +26,7 @@ delete uut spec
 techmap
 opt
 stat miter
-abc -script +print_stats;strash;print_stats;drwsat;print_stats;print_stats;fraig;print_stats;dc2,-l,-b;print_stats;irw,-l,-z;print_stats;refactor,-N,15,-z;print_stats;dch,-S,50000,-C,10000;print_stats;dc2,-l;print_stats;fraig,-C,10000;print_stats miter
-techmap
-opt
-stat
-qbfsat -dump-final-smt2 /tmp/test.smt2 -write-solution alu2.soln -solver yices -timeout 3600 -nocleanup -assume-outputs -assume-negative-polarity -specialize miter
+qbfsat -O2 -write-solution alu2.soln -solver yices -timeout 3600 -nocleanup -assume-outputs -assume-negative-polarity miter
 design -pop
 stat
 
diff --git a/examples/smtbmc/glift/alu4.ys b/examples/smtbmc/glift/alu4.ys
index 3fc2112d6..8e8d14225 100644
--- a/examples/smtbmc/glift/alu4.ys
+++ b/examples/smtbmc/glift/alu4.ys
@@ -26,11 +26,7 @@ delete uut spec
 techmap
 opt
 stat miter
-abc -script +print_stats;strash;print_stats;drwsat;print_stats;print_stats;fraig;print_stats;dc2,-l,-b;print_stats;irw,-l,-z;print_stats;refactor,-N,15,-z;print_stats;dch,-S,50000,-C,10000;print_stats;dc2,-l;print_stats;fraig,-C,10000;print_stats miter
-techmap
-opt
-stat
-qbfsat -dump-final-smt2 /tmp/test.smt2 -write-solution alu4.soln -solver yices -timeout 3600 -nocleanup -assume-outputs -assume-negative-polarity -specialize miter
+qbfsat -O2 -write-solution alu4.soln -solver yices -timeout 3600 -nocleanup -assume-outputs -assume-negative-polarity miter
 design -pop
 stat
 
diff --git a/examples/smtbmc/glift/t481.ys b/examples/smtbmc/glift/t481.ys
index 282e723af..0e4afffda 100644
--- a/examples/smtbmc/glift/t481.ys
+++ b/examples/smtbmc/glift/t481.ys
@@ -26,11 +26,7 @@ delete uut spec
 techmap
 opt
 stat miter
-abc -script +print_stats;strash;print_stats;drwsat;print_stats;print_stats;fraig;print_stats;dc2,-l,-b;print_stats;irw,-l,-z;print_stats;refactor,-N,15,-z;print_stats;dch,-S,50000,-C,10000;print_stats;dc2,-l;print_stats;fraig,-C,10000;print_stats miter
-techmap
-opt
-stat
-qbfsat -dump-final-smt2 /tmp/test.smt2 -write-solution t481.soln -solver yices -timeout 3600 -nocleanup -assume-outputs -assume-negative-polarity -specialize miter
+qbfsat -O2 -write-solution t481.soln -solver yices -timeout 3600 -nocleanup -assume-outputs -assume-negative-polarity miter
 design -pop
 stat
 
diff --git a/examples/smtbmc/glift/too_large.ys b/examples/smtbmc/glift/too_large.ys
index 05b9fa5dc..77be61e17 100644
--- a/examples/smtbmc/glift/too_large.ys
+++ b/examples/smtbmc/glift/too_large.ys
@@ -26,11 +26,7 @@ delete uut spec
 techmap
 opt
 stat miter
-abc -script +print_stats;strash;print_stats;drwsat;print_stats;print_stats;fraig;print_stats;dc2,-l,-b;print_stats;irw,-l,-z;print_stats;refactor,-N,15,-z;print_stats;dch,-S,50000,-C,10000;print_stats;dc2,-l;print_stats;fraig,-C,10000;print_stats miter
-techmap
-opt
-stat
-qbfsat -dump-final-smt2 /tmp/test.smt2 -write-solution too_large.soln -solver yices -timeout 3600 -nocleanup -assume-outputs -assume-negative-polarity -specialize miter
+qbfsat -O2 -write-solution too_large.soln -solver yices -timeout 3600 -nocleanup -assume-outputs -assume-negative-polarity miter
 design -pop
 stat
 
diff --git a/examples/smtbmc/glift/ttt2.ys b/examples/smtbmc/glift/ttt2.ys
index beba8b102..1314d4975 100644
--- a/examples/smtbmc/glift/ttt2.ys
+++ b/examples/smtbmc/glift/ttt2.ys
@@ -26,11 +26,7 @@ delete uut spec
 techmap
 opt
 stat miter
-abc -script +print_stats;strash;print_stats;drwsat;print_stats;print_stats;fraig;print_stats;dc2,-l,-b;print_stats;irw,-l,-z;print_stats;refactor,-N,15,-z;print_stats;dch,-S,50000,-C,10000;print_stats;dc2,-l;print_stats;fraig,-C,10000;print_stats miter
-techmap
-opt
-stat
-qbfsat -dump-final-smt2 /tmp/test.smt2 -write-solution ttt2.soln -solver yices -timeout 3600 -nocleanup -assume-outputs -assume-negative-polarity -specialize miter
+qbfsat -O2 -write-solution ttt2.soln -solver yices -timeout 3600 -nocleanup -assume-outputs -assume-negative-polarity miter
 design -pop
 stat
 
diff --git a/examples/smtbmc/glift/x1.ys b/examples/smtbmc/glift/x1.ys
index e48a4e6ce..b588dea92 100644
--- a/examples/smtbmc/glift/x1.ys
+++ b/examples/smtbmc/glift/x1.ys
@@ -26,11 +26,7 @@ delete uut spec
 techmap
 opt
 stat miter
-abc -script +print_stats;strash;print_stats;drwsat;print_stats;print_stats;fraig;print_stats;dc2,-l,-b;print_stats;irw,-l,-z;print_stats;refactor,-N,15,-z;print_stats;dch,-S,50000,-C,10000;print_stats;dc2,-l;print_stats;fraig,-C,10000;print_stats miter
-techmap
-opt
-stat
-qbfsat -dump-final-smt2 /tmp/test.smt2 -write-solution x1.soln -solver yices -timeout 3600 -nocleanup -assume-outputs -assume-negative-polarity -specialize miter
+qbfsat -O2 -write-solution x1.soln -solver yices -timeout 3600 -nocleanup -assume-outputs -assume-negative-polarity miter
 design -pop
 stat