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Subject: Re: Nice Stalemate Trap by Tinker

Author: Kai Skibbe

Date: 08:46:25 10/29/01

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On October 29, 2001 at 01:30:12, Dieter Buerssner wrote:

>Tinker caught Yace in a nice stalemate trap.
>
>[D] 7k/6R1/6R1/1r5P/6K1/8/8/8 b - - 0 55
>
>Yace just captured on g7. It is easy to see for a human, but engines seem to
>have problems with this. Yace got a nice fail low from +7.4 to draw score in the next move. Do other engines see this immediately? With and without TBs (KRRKR >can help here).

Hi Dieter,

I let Gromit 3.9.5 on my Celeron 400MHz analyse the position before move 55.
Rxg7.

Here is the output with all 4-men tablebases :

Analysis by Gromit 3.9.5:

55.Tcxg7 Tb4+ 56.Kf5 Tb5+ 57.Ke6 Txh5
  +-  (7.15)   Tiefe: 4/12   00:00:00  24kN, tb=22
55.Tcxg7
  +-  (6.95)   Tiefe: 5/14   00:00:00  55kN, tb=78
55.Tcxg7
  +-  (6.95)   Tiefe: 5/14   00:00:00  57kN, tb=87
55.Tcxg7 Tb4+ 56.Kh3 Th4+ 57.Kg3 Th3+ 58.Kf4 Th4+ 59.Tg4
  +-  (7.13)   Tiefe: 6/16   00:00:00  78kN, tb=361
55.Tcxg7
  +-  (6.93)   Tiefe: 7/17   00:00:01  111kN, tb=1148
55.Tcxg7
  +-  (5.93)   Tiefe: 7/17   00:00:01  112kN, tb=1172
55.Tcxg7
  +-  (1.93)   Tiefe: 7/17   00:00:01  113kN, tb=1191
55.Tcxg7 Tg5+ 56.Kh3 Txh5+
  =  (0.01)   Tiefe: 7/17   00:00:01  114kN, tb=1213
55.Kh4
  =  (0.02)   Tiefe: 7/17   00:00:01  140kN, tb=1331
55.Kh4
  ±  (1.02)   Tiefe: 7/19   00:00:01  146kN, tb=1384
55.Kh4 Tb4+ 56.Kh3 Tb3+ 57.Kg2 Tc3 58.Td7 Tc2+ 59.Kf3 Tc3+ 60.Ke4 Tc4+ 61.Ke3
  +-  (4.53)   Tiefe: 7/22   00:00:03  298kN, tb=2456
55.Kf3
  +-  (4.54)   Tiefe: 7/22   00:00:03  332kN, tb=2864


And here the output without tablebases :

Analysis by Gromit 3.9.5:

  +-  (7.11)   Tiefe: 4/12   00:00:00  20kN
55.Tcxg7 Tb4+ 56.Kh3 Th4+ 57.Kg3 Th3+
  +-  (7.03)   Tiefe: 5/14   00:00:00  58kN
55.Tcxg7
  +-  (6.73)   Tiefe: 6/16   00:00:00  71kN
55.Tcxg7
  +-  (6.73)   Tiefe: 6/18   00:00:00  78kN
55.Tcxg7 Tb4+ 56.Kh3 Th4+
  +-  (6.54)   Tiefe: 7/18   00:00:01  142kN
55.Tcxg7
  +-  (6.24)   Tiefe: 8/22   00:00:01  221kN
55.Tcxg7
  +-  (5.24)   Tiefe: 8/22   00:00:01  225kN
55.Tcxg7 Tb4+ 56.Kf5 Tb5+
  ±  (1.25)   Tiefe: 8/22   00:00:02  233kN
55.Tgxg7
  ±  (1.26)   Tiefe: 8/22   00:00:02  271kN
55.Tgxg7 Tg5+
  ±  (1.26)   Tiefe: 8/22   00:00:02  284kN
55.Kh4
  ±  (1.27)   Tiefe: 8/22   00:00:02  313kN
55.Kh4
  +-  (2.27)   Tiefe: 8/22   00:00:02  322kN
55.Kh4 Tb4+ 56.Kh3 Tb3+ 57.Kg2 Tc3 58.Td7 Tc4 59.h6 Tc2+ 60.Kf3 Tc3+ 61.Ke4 Tc4+
62.Ke3
  +-  (4.80)   Tiefe: 8/23   00:00:06  761kN
55.Kf3
  +-  (4.81)   Tiefe: 8/23   00:00:08  1005kN


So Gromit would have avoided the draw on blitz-level.


Best regards
Kai



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