Consider this as tentative, since I heard it about 3rd-hand, but I believe the number of processors used to have been 3000.
Congratulations to the Mogo team; good luck improving your program to deal with the ladder and life-and-death issues. Looking forward to further information! I have always wondered if AMAF is a feature or a bug. There are many situations where the order of moves is crucial; A before B wins, B before A loses; ladders are a classic example where the ordering of moves is utterly important. AMAF seems to assume that order doesn't matter. Of course, there are many other positions where this assumption is true; that is why it sometimes yields an improvement in processing speed, but it seems risky. Ladders are also a classic case where two patterns can look very similar, but be very different. When you capture a ladder, you are in a very good position. But if the stones under attack have just one extra liberty, the position may "look like" a ladder, but your target will escape, and your stones will be full of cutting points; the proper evaluation for that position would be much harsher. More generally, whenever I see a Monte Carlo program lose, it is usually a semeai where being one liberty behind or one ahead makes all the difference. We call these "capturing races" in English for a reason; being ahead or behind by one liberty matters a great deal. To make life interesting, there are "loose ladder" constructs where an extra liberty does not help the fleeing stones; they still get corraled and captured. These corner cases are tough, but many games hinge on correctly reading out the exact consequences of life-and-death struggles. Terry McIntyre <[EMAIL PROTECTED]> "Go is very hard. The more I learn about it, the less I know." -Jie Li, 9 dan > On Mon, 2008-09-22 at 13:59 +0200, Magnus Persson wrote: > > Quoting Mark Boon : > > > > > Playing out that fake ladder in the first game meant an instant loss. > > > Surprising. And embarassing. Any information on the number of > > > processors used? _______________________________________________ computer-go mailing list computer-go@computer-go.org http://www.computer-go.org/mailman/listinfo/computer-go/