X-Git-Url: http://winboard.nl/cgi-bin?a=blobdiff_plain;f=book.c;h=4f389acb04d591276101184730db100dc7515310;hb=35467b2a732c657950558ace3007a07ca1270384;hp=3650b0192fa5491b9fed5db4f69001feecea381b;hpb=a134d9e2ce36db71ba56b5e4afea97bef21277ab;p=xboard.git

diff --git a/book.c b/book.c
index 3650b01..4f389ac 100644
--- a/book.c
+++ b/book.c
@@ -534,6 +534,7 @@ char *ProbeBook(int moveNr, char *book)
     for(i=0; i<count; i++){
         total_weight += entries[i].weight;
     }
+    if(total_weight == 0) return NULL; // force book miss rather than playing moves with weight 0.
     j = (random() & 0xFFF) * total_weight >> 12; // create random < total_weight
     total_weight = 0;
     for(i=0; i<count; i++){