My mercy threshold is 27 stones, and this position is not a problem. It gets the same win rate (10.6%) with or without mercy. The mercy rule makes about 1.25% faster.
David > -----Original Message----- > From: [email protected] [mailto:computer-go- > [email protected]] On Behalf Of Brian Sheppard > Sent: Tuesday, August 18, 2009 1:25 PM > To: [email protected] > Subject: [computer-go] Mercy rule position > > 1 2 3 4 5 6 7 8 9 > A - X - O - - O - - > B - - O - O O - O O > C O O O X O - O O X > D X X O O O - O X X > E - X X O X O O X - > F X - X X X X X X - > G X X O O O O O X X > H X O O X X O O O X > J - O - X X - O O O > O to play and win :-) > > The "play and win" is a joke, of course. O has a big, dead, > one-eye group at bottom. > > But Pebbles simulations was winning this position at over > 84% for O, no matter how long it searched. > > When I investigated, it turns out to be because of the "mercy > rule." I had set the threshold at 25% of the board, or 20 > stones difference between the sides. Here is a position: > > 1 2 3 4 5 6 7 8 9 > A O - O O O - O - O > B O O O O O O - O O > C O O O - O - O O X > D X X O O O X O X X > E - X X O X O O X X > F X - X X X X X X - > G X X O O O O O X X > H X O O O O O O O X > J O O - X - O O O O > O "wins" by mercy rule, 45 stones to 24 > > I can move the threshold, of course, and that "fixes" the > problem. But I am wondering if there is a more reliable approach. > > What do you do in your program? > > _______________________________________________ > computer-go mailing list > [email protected] > http://www.computer-go.org/mailman/listinfo/computer-go/ _______________________________________________ computer-go mailing list [email protected] http://www.computer-go.org/mailman/listinfo/computer-go/
