Author: Dave Gomboc
Date: 01:50:13 03/07/99
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On March 02, 1999 at 17:25:08, Will Singleton wrote: > 5R2/8/8/4rp2/3r4/5k2/2B1p2P/2K1R3 w - - > White to move and draw. > >Well, that one turned out to be more interesting than I anticipated. We found >that a couple of programs could see the draw w/o tablebases (Ferret, and perhaps >Lambchop), and Crafty gave the tablebase draw result. Gives the rest of us >something to think about. > >Aside from that, there was pretty much agreement on Rxf5. One program chose >Bxf5 with a larger negative score than the concensus on Rxf5. That might bear >looking into. > >Zchess was the only one not to consider Rg8. The passed pawns were scored so >highly that the idea of bringing the rooks down to defend wasn't even an option. > >And for some reason, it took my program a ton of nodes to resolve the fail-low, >and then a ton more to find the better move. Something for me to worry about. >(Maybe time to put in some endgame knowledge, but I think there's something else >going on.) > >Will How are you trying to resolve the fail-low at the PV? Have you tried completely restarting the search (with the TT intact! :) My understanding is that this is the preferred method nowadays... but certainly, YMMV. I am interested to hear from those who do restart on PV fail-lows, and those who tried it but found it lacking. Dave Gomboc
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