X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ian/git?a=blobdiff_plain;f=solo.c;h=43abc1f8e7213cad033b848556f1f50e9d5f8164;hb=bbf800e49ee5965c21eb4a89116e7529d0d4954f;hp=70621948c3ed3f5bec3c921d8777e51608663537;hpb=6567260eb0af75a3c82f4a8a8292c6446d94fd98;p=sgt-puzzles.git

diff --git a/solo.c b/solo.c
index 7062194..43abc1f 100644
--- a/solo.c
+++ b/solo.c
@@ -1773,9 +1773,16 @@ static void solver(int cr, struct block_structure *blocks,
      * Place all the clue numbers we are given.
      */
     for (x = 0; x < cr; x++)
-	for (y = 0; y < cr; y++)
-	    if (grid[y*cr+x])
+	for (y = 0; y < cr; y++) {
+            int n = grid[y*cr+x];
+	    if (n) {
+                if (!cube(x,y,n)) {
+                    diff = DIFF_IMPOSSIBLE;
+                    goto got_result;
+                }
 		solver_place(usage, x, y, grid[y*cr+x]);
+            }
+        }
 
     /*
      * Now loop over the grid repeatedly trying all permitted modes