Author: Bob Durrett
Date: 17:23:32 01/10/04
Go up one level in this thread
On January 10, 2004 at 18:29:20, Mike Byrne wrote: >On January 10, 2004 at 17:47:25, Drexel,Michael wrote: > >>On January 10, 2004 at 17:22:53, Kurt Utzinger wrote: >> >>>On January 10, 2004 at 15:29:16, David Dahlem wrote: >>> >>>>White to move and draw. Which engines can find it? >>>> >>>>[D]3B4/1r2p3/r2p1p2/bkp1P1p1/1p1P1PPp/p1P1K2P/PPB5/8 w - - 0 1 >>>> >>>>1. Ba4+ Kxa4 2. b3+ Kb5 3. c4+ Kc6 4. d5+ Kd7 5. e6+ Kxd8 6. f5 1/2-1/2 >>>> >>>>Regards >>>>Dave >>> >>>Crafty_1908 WB2: (P4 1.8/32 MB hash) >>> 3 00:00 -4.04 1. c4+ Kxc4 2. Bd3+ Kd5 3. Bxa6 cxd4+ 4. Kd3 >>> 4 00:00 -4.01 1. c4+ Kxc4 2. Bd3+ Kd5 3. Bxa6 cxd4+ 4. Kd3 Ra7 >>> 4 00:00 -3.64 1. Ba4+!! >>> 4 00:00 0.00 1. Ba4+ Kxa4 2. b3+ Kb5 3. c4+ Kc6 4. d5+ Kd7 5. e6+ Kxd8 6. >>>f5 >>> 5 00:00 0.00 1. Ba4+ Kxa4 2. b3+ Kb5 3. c4+ Kc6 4. d5+ Kd7 5. e6+ Kxd8 6. >>>f5 Rba7 >>> 6 00:00 0.00 1. Ba4+ Kxa4 2. b3+ Kb5 3. c4+ Kc6 4. d5+ Kd7 5. e6+ Kxd8 6. >>>f5 Rba7 7. Kf3 >>> 7 00:01 0.00 1. Ba4+ Kxa4 2. b3+ Kb5 3. c4+ Kc6 4. d5+ Kd7 5. e6+ Kxd8 6. >>>f5 Rba7 7. Kf3 Rc6 >>> 8 00:01 0.00 1. Ba4+ Kxa4 2. b3+ Kb5 3. c4+ Kc6 4. d5+ Kd7 5. e6+ Kxd8 6. >>>f5 Rba7 7. Kf3 Rc6 8. Ke4 >>> 9 00:01 0.00 1. Ba4+ Kxa4 2. b3+ Kb5 3. c4+ Kc6 4. d5+ Kd7 5. e6+ Kxd8 6. >>>f5 Rba7 7. Kf3 Rc6 8. Ke4 Rb6 >>>10 00:03 0.00 1. Ba4+ Kxa4 2. b3+ Kb5 3. c4+ Kc6 4. d5+ Kd7 5. e6+ Kxd8 6. >>>f5 Rba7 7. Kf3 Rc6 8. Ke4 Rb6 9. Kf3 >>>11 00:08 0.00 1. Ba4+ Kxa4 2. b3+ Kb5 3. c4+ Kc6 4. d5+ Kd7 5. e6+ Kxd8 6. >>>f5 Rba7 7. Kf3 Rc6 8. Ke4 Rb6 9. Kf3 Rc6 >>>12 00:11 0.00 1. Ba4+ Kxa4 2. b3+ Kb5 3. c4+ Kc6 4. d5+ Kd7 5. e6+ Kxd8 6. >>>f5 Rba7 7. Kf3 Rc6 8. Ke4 Rb6 9. Kf3 Rc6 >> >>Interesting. Crafty 19.06 can't find 1.Ba4+. >> >>Michael >> >>New game >>3B4/1r2p3/r2p1p2/bkp1P1p1/1p1P1PPp/p1P1K2P/PPB5/8 w - - 0 1 >> >>Analysis by Crafty 19.06: >> >>1.c4+ Kxc4 2.Bd3+ Kd5 3.Bxa6 cxd4+ >> -+ (-4.45) Depth: 1/18 00:00:00 >>1.c4+ Kxc4 2.Bd3+ Kd5 3.Bxa6 cxd4+ >> -+ (-4.45) Depth: 1/18 00:00:00 >>1.c4+ Kxc4 2.Bd3+ Kd5 3.Bxa6 cxd4+ >> -+ (-4.45) Depth: 2/18 00:00:00 >>1.c4+ Kxc4 2.Bd3+ Kd5 3.Bxa6 cxd4+ >> -+ (-4.45) Depth: 2/18 00:00:00 >>1.c4+ Kxc4 2.Bd3+ Kd5 3.Bxa6 cxd4+ >> -+ (-4.45) Depth: 2/18 00:00:00 >>1.c4+ Kxc4 2.Bd3+ Kd5 3.Bxa6 cxd4+ 4.Kd3 >> -+ (-4.28) Depth: 3/19 00:00:00 >>1.c4+ Kxc4 2.Bd3+ Kd5 3.Bxa6 cxd4+ 4.Kd3 Ra7 >> -+ (-4.25) Depth: 4/19 00:00:00 >>1.c4+ Kxc4 2.Bd3+ Kd5 3.Be4+ Ke6 4.f5+ Kd7 5.Bxb7 axb2 6.Bxa6 b1Q 7.Bxa5 dxe5 >>8.dxc5 Qxa2 >> -+ (-5.36) Depth: 5/23 00:00:00 >>1.c4+ Kxc4 2.Bd3+ Kd5 3.Be4+ Ke6 4.f5+ Kd7 5.Bxb7 axb2 6.Bxa6 b1Q 7.Bxa5 dxe5 >>8.dxc5 Qxa2 >> -+ (-5.36) Depth: 6/24 00:00:00 392kN >>1.c4+ Kxc4 2.Bd3+ Kd5 3.Be4+ Ke6 4.f5+ Kd7 5.Bxb7 axb2 6.Bxa6 b1Q 7.Bxa5 dxe5 >>8.dxc5 Qxa2 >> -+ (-5.36) Depth: 7/26 00:00:01 806kN >>1.c4+ Kxc4 2.Bd3+ Kd5 3.Be4+ Ke6 4.Bxb7 gxf4+ 5.Kxf4 dxe5+ 6.dxe5 Ra7 7.Bxa5 >>axb2 8.Bc8+ Kd5 9.Bb6 b1Q 10.Bxa7 Qxa2 >> -+ (-5.73) Depth: 8/27 00:00:04 2236kN >>1.c4+ Kxc4 2.Bd3+ Kd5 3.Be4+ Ke6 4.f5+ Kd7 5.Bxb7 cxd4+ 6.Kxd4 dxe5+ 7.Kc5 Ra7 >>8.bxa3 Bxd8 9.Bc6+ Kc7 10.axb4 Rxa2 >> -+ (-6.00) Depth: 9/28 00:00:08 5405kN >>1.c4+ Kxc4 2.Bd3+ Kd5 3.Be4+ Ke6 4.f5+ Kf7 5.Bxb7 axb2 6.Bxa6 b1Q 7.Bxa5 Qxa2 >>8.e6+ Kf8 9.Bb6 Qxa6 10.dxc5 dxc5 11.Bxc5 >> -+ (-6.55) Depth: 10/30 00:00:31 21256kN > >It becomes a block pawn position, so when crafty is compiled with /DDETECTDRAW, >it will find it. Would somebody who is familiar with Crafty's /DDETECTDRAW code please tell everybody WHY is works [in plain English, please]? What is special about that code which almost every other chess programmer has failed to put into his/her engines? What does that code do [other than produce the correct move] which is unique? Bob D.
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