Re: [gnugo-devel] GTP GnuGo and small boards

[Allan Crossman]

> The official answer is that boards smaller than 9x9 are not really
> supported by GNU Go. If someone tracks the bug down a fix will of
> course be accepted anyway. Personally I won't bother with it, but it
> could be a good exercise for someone who wants to start learning about
> the inner workings of the engine.

I do realize that small boards aren't too well supported, but I thought a 
well-behaved GTP engine shouldn't crash like this. :)

I don't have the abilities to do a real fix, but the following is a 
workaround that at least makes the problem cause a graceful error.

diff -u play_gtp.c play_gtp_fixed.c
--- play_gtp.c  Sun Sep 30 11:56:03 2001
+++ play_gtp_fixed.c    Sat Oct  6 22:59:32 2001
@@ -298,8 +298,11 @@
   int boardsize;
   if (sscanf(s, "%d", &boardsize) < 1)
     return gtp_failure(id, "boardsize not an integer");
-
-  if (boardsize < MIN_BOARD || boardsize > MAX_BOARD)
+
+/* FIXME: The following should be:  if (boardsize < MIN_BOARD || 
boardsize > MAX_BOARD)
+   but actually a boardsize under 5 will crash GnuGo in GTP mode for some 
reason.    */
+
+  if (boardsize < 5 || boardsize > MAX_BOARD)
     return gtp_failure(id, "unacceptable boardsize");

   board_size = boardsize;