diff --git a/src/statebag.py b/src/statebag.py
--- a/src/statebag.py
+++ b/src/statebag.py
@@ -17,8 +17,8 @@ So we try to find the correct crossover 
 - linearize the fork back by discarding s'_j-s preceding the crossover and s_j-s following the crossover
 """
 
-from util import BLACK,WHITE,EMPTY
-from go import transitionSequence
+from util import EMPTY
+from go.core import transitionSequence
 
 
 ## Crude lower bound on edit distance between states.