Author: Roy Brunjes
Date: 14:19:18 02/23/03
Go up one level in this thread
On February 23, 2003 at 16:27:08, Mike Byrne wrote: >On February 23, 2003 at 16:23:16, Mike Byrne wrote: > >>Ruffian , among others, like Shredder 7, gets confused by this position, It >>thinks it's mate in 18 for black and plays Kxd7 -- which, unfortunately leads to >>a Mate in 18 for BLACK!. The problem here is that the EGTB does not recognizing > >a mate in 18 for WHITE after Kxd7?? > > > >>castling rights and the program is not examining them either. >> >>Proper play is Kd8 and black mates in 18 >> >>[d] 2k5/3P4/8/8/8/8/1r5p/R3K3 b Q - 0 1 >> >>Ruffian 1.0.1 analysis >> >>New game >>2k5/3P4/8/8/8/8/1r5p/R3K3 b Q - 0 1 >> >>Analysis by Ruffian 1.0.1: >> >>1. -+ (-#17): 1...Kxd7 2.0-0-0+ Ke6 3.Kxb2 Kf5 >>2. -+ (-#18): 1...Kd8 2.Ra8+ Kxd7 >> >>(Byrne, Secane, PA USA 23.02.2003) >> >>Proper Analysis: >> >> >>If black plays Kxd7, then it is mate for white in 18 with 0-0-0 as shown by >>Fritz 8. >> >> >>[d]8/3k4/8/8/8/8/1r5p/R3K3 w Q - 0 1 >> >>Analysis by Fritz 8: >> >>1. +- (#18): 2.0-0-0+ Ke6 3.Kxb2 Ke5 4.Kc3 >>2. -+ (-#16): 2.Ra7+ Kc6 3.Rh7 h1Q+ 4.Rxh1 Rb1+ >> >>(Byrne, Secane, PA USA 23.02.2003) Junior 7 also has the same problem: New game 2k5/3P4/8/8/8/8/1r5p/R3K3 b Q - 0 1 Analysis by Junior 7: 1...Kxd7 2.0-0-0+ ± (1.28) Depth: 3 00:00:00 1...Kb7 2.d8Q h1Q# = (0.06) Depth: 3 00:00:00 1...Kc7 2.0-0-0 ³ (-0.61) Depth: 3 00:00:00 1...Kd8 2.0-0-0 µ (-0.80) Depth: 3 00:00:00 1...Kd8! µ (-1.10) Depth: 6 00:00:00 1...Kd8 2.0-0-0 Rg2 3.Rd2 -+ (-10.52) Depth: 6 00:00:00 1...Kxd7! -+ (-#17) Depth: 6 00:00:00, tb=1 1...Kxd7 -+ (-#17) Depth: 6 00:00:00, tb=2 (Brunjes, MyTown 23.02.2003) Fritz 8 does not have the problem however: New game 2k5/3P4/8/8/8/8/1r5p/R3K3 b Q - 0 1 Analysis by Fritz 8: 1...Kd8 2.0-0-0 Rg2 3.Kb1 Rg1 4.Rc1 h1Q -+ (-9.84) Depth: 7/17 00:00:00 24kN, tb=10 1...Kd8 2.0-0-0 Rg2 3.Kb1 Rg1 4.Rc1 h1Q 5.Rxg1 Qxg1+ 6.Kb2 -+ (-9.91) Depth: 8/21 00:00:00 43kN, tb=26 1...Kd8 2.0-0-0 Rg2 3.Kb1 Rg1 4.Rc1 h1Q 5.Rxg1 Qxg1+ 6.Kb2 Qd4+ -+ (-9.91) Depth: 9/22 00:00:00 107kN, tb=54 1...Kd8! -+ (-10.19) Depth: 10/19 00:00:00 197kN, tb=105 1...Kd8-- -+ (-9.91) Depth: 11/26 00:00:01 488kN, tb=294 1...Kd8 2.0-0-0 Rg2 -+ (-9.91) Depth: 11/26 00:00:01 506kN, tb=336 1...Kd8! -+ (-10.19) Depth: 12/22 00:00:03 1256kN, tb=605 1...Kd8! -+ (-10.47) Depth: 12/23 00:00:03 1282kN, tb=677 1...Kd8! -+ (-11.03) Depth: 12/33 00:00:03 1322kN, tb=760 1...Kd8 2.Ra8+ Kxd7 -+ (-#18) Depth: 12/33 00:00:07 2794kN, tb=1288 (Brunjes, MyTown 23.02.2003) Both of these were run in the Fritz 8 GUI on an Athlon 700 MHz system with 64 MB of hashtables. Roy
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