Author: Mike Byrne
Date: 06:08:55 01/11/04
Go up one level in this thread
On January 11, 2004 at 02:46:18, Uri Blass wrote: >On January 11, 2004 at 00:07:22, Mike Byrne wrote: > >>On January 10, 2004 at 20:23:32, Bob Durrett wrote: >> >>>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. >> >>A picture is worth a thousand words, play the best moves for the above position >>and take a look at the ending position. >> >>[d]3k4/1r2p3/r2pPp2/b1pP1Pp1/1pP3Pp/pP2K2P/P7/8 b - - 0 6 >> >>the code simply identifies a locked position where the K is safely behind bars >>(pawns) , i.e., the game must be drawn. > >The question is if it does not detect draw in wrong cases(for example if black >has a queen instead of a bishop. > >Uri New game 3k4/1r2p3/r2pPp2/q1pP1Pp1/1pP3Pp/pP2K2P/P7/8 b - - 0 1 Analysis by Crafty 19.08 SE: 6...Qa4 7.bxa4 b3 8.axb3 Rxb3+ 9.Ke4 Rxh3 10.a5 Rxa5 -+ (-23.39) Depth: 8 00:00:00 101kN 6...Qa4 -+ (-23.79) Depth: 9 00:00:00 112kN 6...Qa4 7.bxa4 b3 8.axb3 Rxb3+ 9.Ke4 Rxh3 10.a5 Rh1 11.Kd3 Rxa5 -+ (-23.89) Depth: 9 00:00:00 114kN 6...Qa4 7.bxa4 b3 8.axb3 Rxb3+ 9.Ke4 Rxh3 10.a5 Rh1 11.Kd3 Rxa5 -+ (-23.89) Depth: 9 00:00:00 255kN 6...Qa4 7.bxa4 b3 8.axb3 Rxb3+ 9.Ke4 Rxh3 10.a5 Rh1 11.Kf3 Rxa5 -+ (-23.99) Depth: 10 00:00:00 285kN 6...Qa4 7.bxa4 b3 8.axb3 Rxb3+ 9.Ke4 Rxh3 10.a5 Rh1 11.Kf3 Rxa5 -+ (-23.99) Depth: 10 00:00:01 566kN 6...Qa4 -+ (-24.39) Depth: 11 00:00:01 573kN 6...Qa4 7.bxa4 b3 8.axb3 Rxb3+ 9.Kf2 Rab6 10.Ke2 Rb2+ 11.Kf3 R6b3+ 12.Ke4 Re2# -+ (-#7) Depth: 11 00:00:11 6025kN 6...Qa4 7.bxa4 b3 8.axb3 Rxb3+ 9.Kf2 Rab6 10.Ke2 Rb2+ 11.Kf3 R6b3+ 12.Ke4 Re2# -+ (-#7) Depth: 11 00:00:13 7559kN 6...Qa4 7.bxa4 b3 8.axb3 Rxb3+ 9.Kf2 Rab6 10.Ke2 Rb2+ 11.Kf3 R6b3+ 12.Ke4 Re2# -+ (-#7) Depth: 12 00:00:50 27457kN (Byrne, Secane, PA USA 11.01.2004) not in this case ..you put any type of piece (Queen, light square bishop or knight) that can a force a win and it will see it
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