Author: William Bryant
Date: 20:13:25 07/26/00
Go up one level in this thread
On July 26, 2000 at 01:12:05, Steffen Jakob wrote: >Here is yet another endgame position: > >3R4/8/6p1/p1p2bk1/P1Pb4/1P5P/6B1/7K w > >It's from a game MissSilicon (nut) - Hossa. Misssi found the nice move b4! >Andrew Dados told me that his program needs about 14 seconds (Andrew, do I >remember right?) to find this move. I tried it with Hossa and it took ages. How >does your favourite program perform? And another important question: is there >another way to win this position for white? > >Best wishes, >Steffen. The key is the passed pawn extension, which I have disabled on some recent versions of Screamer. The version with a passed pawn extension finds b4 at ply 8/5 in 21.105 seconds The version without the extnsion takes forever to fail high on ply 14/02 in 1827.414 seconds. The programs are otherwise identical. G2 266mhz Mac. William wbryant@ix.netcom.com Log below -----with passed pawn extension New Board Position 3R4/8/6p1/p1p2bk1/P1Pb4/1P5P/6B1/7K w Move 1 W>> The Current Search Time: 300 seconds Trying Book Move PLY NODES TIME SCORE PV __________________________________________________ 5/00 6703 0.114 +2.23 Rd5 Kf4 Rd6 Bc2 Rb6 5/02 10184 0.213 +2.53 Rf8 Bc2 Rf3 Bf5 Kh2 6/00 17072 0.343 +2.48 Rf8 Bc2 Rf3 Bf5 Kh2 Be4 7/00 41645 0.734 +2.48 Rf8 Bc2 Rf3 Bf5 Kh2 Be5+ Kg1 Be4 8/00 91821 1.486 +2.43 Rf8 Bc2 Rf3 Bd1 Rd3 Bc2 Rg3+ Kf4 Kh2 8/05 1247482 21.105 ++ b4 8/05 1976497 32.642 +3.01 b4 Bf6 Rf8 Bd3 bxc5 Bxc4 c6 -----with passed pawn extension New Board Position 3R4/8/6p1/p1p2bk1/P1Pb4/1P5P/6B1/7K w Move 1 W>> Trying Book Move PLY NODES TIME SCORE PV __________________________________________________ 5/00 5250 0.086 +2.23 Rd5 Kf4 Rd6 Bc2 Rb6 5/02 8363 0.192 +2.53 Rf8 Bc2 Rf3 Bf5 Kh2 6/00 13694 0.310 +2.48 Rf8 Bc2 Rf3 Bf5 Kh2 Be4 7/00 34035 0.654 +2.48 Rf8 Bc2 Rf3 Bf5 Kh2 Be5+ Kg1 Be4 8/00 70872 1.214 +2.43 Rf8 Bc2 Rf3 Bd1 Rd3 Bc2 Rg3+ Kf4 Kh2 9/00 194210 2.874 +2.38 Rf8 Bc2 Rf3 Bd1 Rd3 Bc2 Rg3+ Kf4 Rf3+ Ke5 Kh2 9/02 426487 6.148 +2.48 Rb8 Bc3 Rf8 Bc2 Rf3 Bd4 Kh2 Be5+ Kg1 Be4 10/00 779097 11.162 +2.51 Rb8 Bc2 Rb5 Kf4 Kh2 g5 Bd5 Kf5 Rb7 Ke5 10/02 932604 13.047 +2.58 Ra8 Bc3 Rf8 Bc2 11/00 1666240 23.070 +2.58 Ra8 Bc3 Rf8 Bc2 Rf3 Bd4 Kh2 Be5+ Kg1 Bd1 Rd3 Bc2 12/00 3522052 47.649 +2.48 Ra8 Bc3 Rf8 Be5 Kg1 Bc2 Rf3 Bd1 13/00 11899105 161.379 +2.45 Ra8 Bc3 Re8 Bd4 Rb8 Bc2 Rb5 Kf4 Kh2 Bc3 Rxc5 Bxb3 Bc6 14/00 28086697 373.499 +2.43 Ra8 Bc3 Re8 Bd4 Rb8 Bc2 Rb5 Kf4 Kh2 Bc3 Rb6 Ke5 Kg3 Bd4 14/02 67167088 933.832 ++ b4 14/02 112495514 1827.414 +3.51 b4 Bf6 Rf8 axb4 h4+ Kxh4 Rxf6
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