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Subject: Re: Little bug for ChessTiger15.0........tablebases

Author: Chessfun

Date: 04:32:42 07/03/03

Go up one level in this thread


On July 03, 2003 at 05:42:52, George Tsavdaris wrote:

>On July 03, 2003 at 04:16:06, fabio calamassi wrote:
>
>>On July 02, 2003 at 19:41:48, George Tsavdaris wrote:
>>
>>>In this position Chesstiger 14.0 and ChessTiger 15.0 don't find the winning
>>>move 1.fxg8B with win after: 1...Bxc7 2.Nd4! and mate in few moves.
>>>They do not also find the 2.Nd4!
>>>I remember ChessTiger 14.0 had problems with some Knight-Bishop endgames and
>>>it was advertised that with Tiger 15.0 these problems were solved. True but
>>>it seems that there are still some small? problems-bugs like this to solve
>>>until ChessTiger 16.0.
>>>
>>>[D]kb4r1/2P2P2/K7/8/8/1N6/8/8 w - - 0 1
>>
>>
>>     Hello,
>>    on my P4 2,5 GHZ 512 RAM, CT14 and 15 find the winning move instantly!!
>
>Can you please the analysis of both CT-14&15. In my computer CT15 want to
>play Nc5 which draws. If you have the right position and in your computer
>CT-14&15 find the 1.fxg8B then something is wrong with my computer although
>this will be absolutely strange.

It needs tablebaases to find it.

With 3,4 and 5 piece

New game
kb4r1/2P2P2/K7/8/8/1N6/8/8 w - - 0 1

Analysis by Chess Tiger 15.0:

1.fxg8B Bxc7
  +-  (#6)   Depth: 6   00:00:00  6kN, tb=9
1.fxg8B Bxc7
  +-  (#6)   Depth: 6   00:00:00  6kN, tb=9
1.fxg8B Bxc7
  +-  (#6)   Depth: 9   00:00:00  6kN, tb=9
1.fxg8B Bxc7
  +-  (#6)   Depth: 9   00:00:00  6kN, tb=9
1.fxg8B Bxc7
  +-  (#6)   Depth: 9   00:00:00  6kN, tb=9
1.fxg8B Bxc7
  +-  (#6)   Depth: 9   00:00:00  6kN, tb=9
1.fxg8B Bxc7
  +-  (#6)   Depth: 9   00:00:00  6kN, tb=9
1.fxg8B Bxc7
  +-  (#6)   Depth: 9   00:00:00  6kN, tb=9
1.fxg8B Bxc7
  +-  (#6)   Depth: 9   00:00:00  6kN, tb=9
1.fxg8B Bxc7
  +-  (#6)   Depth: 9   00:00:00  6kN, tb=9
1.fxg8B Bxc7
  +-  (#6)   Depth: 9   00:00:00  6kN, tb=9
1.fxg8B Bxc7
  +-  (#6)   Depth: 9   00:00:00  6kN, tb=9
1.fxg8B Bxc7
  +-  (#6)   Depth: 9   00:00:00  6kN, tb=9
1.fxg8B Bxc7
  +-  (#6)   Depth: 9   00:00:00  6kN, tb=9
1.fxg8B Bxc7
  +-  (#6)   Depth: 9   00:00:00  6kN, tb=9
1.fxg8B Bxc7
  +-  (#6)   Depth: 9   00:00:00  6kN, tb=9
1.fxg8B Bxc7
  +-  (#6)   Depth: 9   00:00:00  6kN, tb=9
1.fxg8B Bxc7
  +-  (#6)   Depth: 10   00:00:00  9kN, tb=18
1.fxg8B Bxc7
  +-  (#6)   Depth: 11   00:00:00  15kN, tb=45
1.fxg8B Bxc7
  +-  (#6)   Depth: 12   00:00:00  31kN, tb=107
1.fxg8B Bxc7
  +-  (#6)   Depth: 13   00:00:00  90kN, tb=248
1.fxg8B Bxc7
  +-  (#6)   Depth: 14   00:00:01  132kN, tb=509
1.fxg8B Bxc7
  +-  (#6)   Depth: 15   00:00:01  284kN, tb=1066
1.fxg8B Bxc7
  +-  (#6)   Depth: 16   00:00:05  2381kN, tb=1916
1.fxg8B Bxc7
  +-  (#6)   Depth: 17   00:00:06  3189kN, tb=3178
1.fxg8B Bxc7
  +-  (#6)   Depth: 18   00:00:09  4443kN, tb=5424

(Bird, Barrie 03.07.2003)

Without tablebases

1.Nd4 Rc8 2.cxb8Q+ Kxb8 3.Ne6 Rc6+ 4.Kb5 Rxe6 5.f8Q+ Kc7
  ±  (1.20)   Depth: 4   00:00:00  2kN
1.Nc5 Rc8 2.cxb8Q+ Kxb8 3.Kb5 Kc7
  +-  (3.50)   Depth: 4   00:00:00  3kN
1.Nc5 Rc8 2.cxb8Q+ Kxb8 3.Kb5 Kc7 4.Ne6+ Kd6
  +-  (3.50)   Depth: 5   00:00:00  3kN
1.Nc5 Rc8 2.cxb8Q+ Kxb8 3.Kb5 Kc7 4.Ne6+ Kd6
  +-  (3.50)   Depth: 6   00:00:00  3kN
1.Nc5 Rc8 2.cxb8Q+ Kxb8 3.Kb6 Rd8 4.Nd7+ Kc8 5.Kc6 Rxd7 6.f8Q+ Rd8
  +-  (1.52)   Depth: 7   00:00:00  6kN
1.Nc5 Rc8 2.cxb8Q+ Kxb8 3.Kb6 Rd8 4.Kc6
  +-  (2.42)   Depth: 8   00:00:00  10kN
1.Nc5 Rh8 2.cxb8Q+ Kxb8 3.Ne6 Kc8 4.Ka7 Kd7 5.Ng5 Ke7
  =  (0.08)   Depth: 8   00:00:00  31kN
1.Nc5 Rh8 2.cxb8Q+ Kxb8 3.Ne6 Kc8 4.Ka7 Kd7 5.Ng5 Ke7 6.Kb7
  =  (0.08)   Depth: 9   00:00:00  36kN
1.Nc5 Rh8 2.cxb8Q+ Kxb8 3.Ne6 Kc8 4.Ka7 Rh7 5.Ng5 Rxf7+ 6.Nxf7 Kd7
  =  (0.00)   Depth: 10   00:00:00  47kN
1.Nc5 Rh8 2.cxb8Q+ Kxb8 3.Ne6 Kc8 4.Ka7 Rh7 5.Ng5 Rxf7+ 6.Nxf7 Kd7
  =  (0.00)   Depth: 11   00:00:00  75kN
1.Nc5 Rh8 2.cxb8Q+ Kxb8 3.Ne6 Kc8 4.Ka7 Rh7 5.Ng5 Rxf7+ 6.Nxf7 Kd7
  =  (0.00)   Depth: 12   00:00:00  116kN
1.Nc5 Rh8 2.cxb8Q+ Kxb8 3.Ne6 Kc8 4.Ka7 Rh7 5.Ng5 Rxf7+ 6.Nxf7 Kd7
  =  (0.00)   Depth: 13   00:00:00  172kN
1.Nc5 Rh8 2.cxb8Q+ Kxb8 3.Ne6 Kc8 4.Ka7 Rh7 5.Ng5 Rxf7+ 6.Nxf7 Kd7
  =  (0.00)   Depth: 14   00:00:00  274kN
1.Nc5 Rh8 2.cxb8Q+ Kxb8 3.Ne6 Kc8 4.Ka7 Rh7 5.Ng5 Rxf7+ 6.Nxf7 Kd7
  =  (0.00)   Depth: 15   00:00:00  441kN
1.Nc5 Rh8 2.cxb8Q+ Kxb8 3.Ne6 Kc8 4.Ka7 Rh7 5.Ng5 Rxf7+ 6.Nxf7 Kd7
  =  (0.00)   Depth: 16   00:00:00  727kN
1.Nc5 Rh8 2.cxb8Q+ Kxb8 3.Ne6 Kc8 4.Ka7 Rh7 5.Ng5 Rxf7+ 6.Nxf7 Kd7
  =  (0.00)   Depth: 17   00:00:01  1205kN
1.Nc5 Rh8 2.cxb8Q+ Kxb8 3.Ne6 Kc8 4.Ka7 Rh7 5.Ng5 Rxf7+ 6.Nxf7 Kd7
  =  (0.00)   Depth: 18   00:00:02  2046kN
1.Nc5 Rh8 2.cxb8Q+ Kxb8 3.Ne6 Kc8 4.Ka7 Rh7 5.Ng5 Rxf7+ 6.Nxf7 Kd7
  =  (0.00)   Depth: 19   00:00:04  3625kN
1.Nc5 Rh8 2.cxb8Q+ Kxb8 3.Ne6 Kc8 4.Ka7 Rh7 5.Ng5 Rxf7+ 6.Nxf7 Kd7 7.Kb6 Ke6
8.Kc7 Kxf7
  =  (0.00)   Depth: 20   00:00:07  6665kN

(Bird, Barrie 03.07.2003)

Sarah.




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