Author: Robert Hyatt
Date: 13:07:20 02/13/02
Go up one level in this thread
On February 13, 2002 at 15:13:29, pavel wrote: >On February 13, 2002 at 15:07:36, Robert Hyatt wrote: > >>On February 13, 2002 at 15:01:25, pavel wrote: >> >>>Chess Tiger 14.0 - Shredder 6 >>>[D]8/8/3r4/6p1/4k1B1/2K2R2/8/8 w - - 0 1 >>> >>>Analysis by Chess Tiger 14.0: >>> >>>69.Kc3-c4 Rd6-d2 70.Rf3-f8 Ke4-e3 71.Kc4-c5 Rd2-g2 72.Bg4-h5 g5-g4 73.Rf8-e8+ >>>Ke3-f2 >>> +- (2.34) Depth: 9 00:00:00 154kN, tb=54 >>>69.Kc3-c4 Rd6-d2 70.Rf3-f8 Ke4-e3 71.Kc4-c5 Rd2-g2 72.Bg4-h5 g5-g4 73.Rf8-e8+ >>>Ke3-f2 74.Kc5-d5 >>> +- (2.34) Depth: 10 00:00:00 337kN, tb=111 >>>69.Kc3-c4 Rd6-d1 70.Rf3-f8 Rd1-c1+ 71.Kc4-b5 Rc1-g1 72.Bg4-f5+ Ke4-d4 73.Rf8-g8 >>>g5-g4 74.Rg8-d8+ Kd4-e5 75.Rd8-f8 >>> +- (2.28) Depth: 11 00:00:03 1045kN, tb=432 >>>69.Kc3-c4 Rd6-d1 70.Rf3-f8 Rd1-c1+ 71.Kc4-b3 Rc1-g1 72.Bg4-f5+ Ke4-d4 73.Kb3-c2 >>>g5-g4 74.Kc2-d2 g4-g3 75.Kd2-e2 Rg1-g2+ 76.Ke2-f1 >>> +- (2.18) Depth: 12 00:00:09 3250kN, tb=1522 >>>69.Kc3-c4 Rd6-h6 70.Rf3-f7 Rh6-h4 71.Bg4-c8 g5-g4 72.Rf7-d7 Ke4-e3 73.Rd7-d3+ >>>Ke3-f2 74.Rd3-d4 Rh4-h3 75.Rd4-d2+ Kf2-f1 76.Rd2-d7 >>> +- (1.94) Depth: 13 00:00:35 12081kN, tb=4966 >>>69.Rf3-g3 Ke4-f4 70.Rg3-g1 Rd6-a6 71.Kc3-d4 Ra6-a3 72.Bg4-e2 g5-g4 73.Rg1-f1+ >>>Kf4-g5 74.Be2-d3 g4-g3 75.Kd4-e3 g3-g2 76.Rf1-f5+ Kg5-g4 >>> +- (2.06) Depth: 13 00:00:45 15209kN, tb=7564 >>> >>>(Mahamood, MyTown 13.02.2002) >>> >>> >>>Analysis by Shredder 6: >>> >>>69...Ke4-f4 70.Kc3-b4 >>> ³ (-0.26) Depth: 1/2 00:00:00 >>>69...Ke4-f4 70.Rg3-g2 >>> ³ (-0.26) Depth: 2/4 00:00:00 >>>69...Ke4-f4 70.Rg3-g1 Rd6-g6 >>> ³ (-0.31) Depth: 3/6 00:00:00 >>>69...Ke4-f4 70.Rg3-g1 Rd6-g6 71.Kc3-d3 >>> = (-0.14) Depth: 4/8 00:00:00 >>>69...Ke4-f4 70.Rg3-g1 Rd6-d8 71.Bg4-e6 Rd8-d6 72.Kc3-c2 >>> ³ (-0.26) Depth: 5/10 00:00:00 >>>69...Ke4-f4 70.Rg3-g1 Rd6-d8 71.Bg4-e6 Rd8-e8 72.Be6-d7 >>> = (-0.12) Depth: 6/12 00:00:00 >>>69...Ke4-f4 70.Rg3-g1 Rd6-a6 71.Kc3-d4 Ra6-a2 72.Kd4-d3 Ra2-a3+ 73.Kd3-e2 >>> = (-0.06) Depth: 7/14 00:00:00 14kN, tb=292 >>>69...Ke4-f4 70.Rg3-g1 Rd6-a6 71.Bg4-e2 Ra6-c6+ 72.Kc3-d4 Rc6-d6+ 73.Kd4-c5 >>>Rd6-d2 74.Rg1-g2 >>> = (-0.05) Depth: 8/16 00:00:00 30kN, tb=723 >>>69...Ke4-f4 70.Rg3-g1 Rd6-a6 71.Bg4-e2 Ra6-c6+ 72.Kc3-d2 Rc6-d6+ 73.Be2-d3 g5-g4 >>>74.Rg1xg4+ Kf4xg4 >>> = (-0.01) Depth: 9/18 00:00:00 60kN, tb=1707 >>>69...Ke4-f4 70.Rg3-g1 Rd6-a6 71.Bg4-e2 Ra6-c6+ 72.Kc3-d2 Rc6-d6+ 73.Be2-d3 g5-g4 >>>74.Rg1xg4+ Kf4xg4 >>> = (-0.01) Depth: 10/20 00:00:00 133kN, tb=4019 >>>69...Ke4-f4 70.Rg3-g1 Rd6-a6 71.Bg4-e2 Ra6-c6+ 72.Kc3-d2 Rc6-d6+ 73.Be2-d3 g5-g4 >>>74.Rg1xg4+ Kf4xg4 >>> = (-0.01) Depth: 11/22 00:00:01 217kN, tb=6821 >>>69...Ke4-f4 70.Rg3-g1 Rd6-g6 71.Kc3-d4 Rg6-d6+ 72.Kd4-c5 Rd6-a6 73.Kc5-d5 >>> = (-0.01) Depth: 12/24 00:00:01 423kN, tb=12440 >>>69...Ke4-f4 70.Rg3-g1 Rd6-g6 71.Kc3-d4 Rg6-d6+ 72.Kd4-c5 Rd6-a6 73.Bg4-d7 Ra6-g6 >>>74.Rg1-f1+ Kf4-g3 75.Bd7-f5 Kg3-g2 76.Rf1-d1 >>> = (0.00) Depth: 13/25 00:00:02 642kN, tb=18694 >>>69...Ke4-f4 70.Rg3-g1 Rd6-g6 71.Kc3-d4 Rg6-d6+ 72.Kd4-c5 Rd6-a6 73.Bg4-d7 Ra6-g6 >>>74.Rg1-g4+ Kf4-e5 >>> = (0.00) Depth: 14/26 00:00:04 1086kN, tb=29673 >>>69...Ke4-f4 70.Rg3-g1 Rd6-g6 71.Kc3-d4 Rg6-d6+ 72.Kd4-c5 Rd6-a6 73.Bg4-d7 Ra6-g6 >>>74.Rg1-g4+ Kf4-e5 >>> = (0.00) Depth: 15/27 00:00:06 1567kN, tb=40819 >>>69...Ke4-f4 70.Rg3-g1 Rd6-g6 71.Kc3-d4 Rg6-d6+ 72.Kd4-c5 Rd6-a6 73.Bg4-d7 Ra6-g6 >>>74.Rg1-g4+ Kf4-e5 >>> = (0.00) Depth: 16/28 00:00:09 2284kN, tb=56293 >>> >>>(Mahamood, MyTown 13.02.2002) >>> >>> >>> >>>Why does chesstiger thinks it's better. >>>A possible bug? >>> >>>pavs >> >> >>It is missing a piece of knowledge that says "king, rook and bishop vs a >>king and rook is a draw, so a king, rook and bishop vs a king, rook and >>pawn can't possibly be won by the KRB side... >> >>IE: here is crafty's static evaluation of this position with no >>search at all: >> >>note: scores are for the white side >>material evaluation................. 3.60 >>development......................... 0.00 >>pawn evaluation..................... -0.24 >>passed pawn evaluation.............. 0.16 >>passed pawn race evaluation......... 0.00 >>king safety evaluation.............. 0.00 >>interactive piece evaluation........ -3.52 >>total evaluation.................... 0.00 >> >> >>Or after a search: >> >> time surplus 0.00 time limit 30.00 (3:30) >> nss depth time score variation (1) >> 1 0.00 0.00 1. Bh5 >> 1-> 0.00 0.00 1. Bh5+ >> 2 0.00 0.00 1. Bh5 Rd1 >> 2-> 0.00 0.00 1. Bh5 Rd1 >> 3 0.00 0.00 1. Bh5 Rd1 2. Kb4 >> 3-> 0.00 0.00 1. Bh5 Rd1 2. Kb4 >> 4 0.00 0.00 1. Bh5 Rd1 2. Kb4 Ra1 >> 4-> 0.00 0.00 1. Bh5 Rd1 2. Kb4 Ra1 >> 5 0.00 0.00 1. Bh5 Rd1 2. Kb4 Ra1 3. Bg4 >> 5-> 0.01 0.00 1. Bh5 Rd1 2. Kb4 Ra1 3. Bg4 >> 6 0.01 0.00 1. Bh5 Rd1 2. Kb4 Ra1 3. Bg4 Ke5 >> 6-> 0.02 0.00 1. Bh5 Rd1 2. Kb4 Ra1 3. Bg4 Ke5 >> 7 0.04 0.00 1. Bh5 Rd1 2. Kb4 Ra1 3. Bg4 Ke5 4. >> Kc5 >> 7-> 0.05 0.00 1. Bh5 Rd1 2. Kb4 Ra1 3. Bg4 Ke5 4. >> Kc5 >> >>It is something the engine has to "know" as search won't be able to see >>that eventually the pawn is lost, and then the resulting KRB vs KR is >>_still_ a draw. > > >Even without the knowledge, shouldn't TB kick in to help? >note that the search might not be deep enough, also note that the game is >currently running and CT is consistent with it's eval throughout the last 10+ >moves. > >pavs Nope... both sides recognize that KRB vs KR is a draw. So the side with the KRB will delay taking that pawn for as long as possible, to prevent the score from dropping to zero.
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