Make sure node count is positive

[xboard.git] / backend.c

diff --git a/backend.c b/backend.c
index f5b4e59..f3f86c6 100644 (file)
--- a/backend.c
+++ b/backend.c
@@ -9421,6 +9421,9 @@ printf("score=%d count=%d\n",score,count);
            if (sscanf(message, "%d%c %d %d " u64Display " %[^\n]\n",
                       &plylev, &plyext, &curscore, &time, &nodes, buf1) >= 5) {
 
+               if(nodes>>32 == u64Const(0xFFFFFFFF))   // [HGM] negative node count read
+                   nodes += u64Const(0x100000000);
+
                if (plyext != ' ' && plyext != '\t') {
                    time *= 100;
                }