diff --git a/src/cc/sudoku.cpp b/src/cc/sudoku.cpp
index ad6927b6b..10485ec2d 100644
--- a/src/cc/sudoku.cpp
+++ b/src/cc/sudoku.cpp
@@ -2930,10 +2930,12 @@ bool sudoku_validate(struct CCcontract_info *cp,int32_t height,Eval *eval,const
                     case 'G':
                         if ( sudoku_genopreturndecode(unsolved,scriptPubKey) == 'G' )
                         {
-                            fprintf(stderr,"unsolved.(%s)\n",unsolved);
+                            //fprintf(stderr,"unsolved.(%s)\n",unsolved);
                             if ( dupree_solver(0,&score,unsolved) != 1 || score*COIN != tx.vout[1].nValue )
                             {
                                 fprintf(stderr,"ht.%d score.%d vs %.8f %s\n",height,score,(double)tx.vout[1].nValue/COIN,tx.GetHash().ToString().c_str());
+                                if ( ht > 2000 )
+                                    return eval->Invalid("mismatched sudoku value vs score");
                             }
                         }
                         return(true);