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Subject: Re: Can Shredder5 find the best move 1.Ra4?

Author: Enrique Irazoqui

Date: 11:08:06 03/12/01

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On March 12, 2001 at 13:55:06, Eran wrote:

>
>Alekhine - Capablanca
>[D]8/5p1k/r5pp/P7/3R3P/6P1/5PK1/8 w - - 0 1
>
>The best move is 1.Ra4. 1.Rd5 is not the best move. Obviously, the knowledge
>about a passed pawn being supported by a rook from the rear has to be
>implemented in Fritz6 and Junior6. Can Shredder5 find it? Please let me know.

After 2 or 3 minutes on a P750, Shredder 5 and Deep Shredder play Rd5.

Enrique

>Both programs were analyzed on Pentium III 1000 MHZ and 128 MB hashtable.
>
>Analysis by Fritz 6:
>
>1.Kf3
>  ²  (0.63)   Depth: 1/3   00:00:00
>1.Kf3 Rxa5
>  =  (0.22)   Depth: 1/5   00:00:00
>1.Rd7
>  ²  (0.47)   Depth: 1/5   00:00:00
>1.Rd7 Rxa5 2.Rxf7+ Kg8
>  ±  (1.06)   Depth: 1/5   00:00:00
>1.Rd5
>  +-  (1.41)   Depth: 1/5   00:00:00
>1.Rd5
>  +-  (1.78)   Depth: 1/5   00:00:00
>1.Rd5 Kg7
>  +-  (1.72)   Depth: 2/5   00:00:00
>1.Rd5 Kg7 2.Kf3
>  +-  (1.81)   Depth: 3/7   00:00:00
>1.Rd5 Kg7 2.Kf3 Kf6
>  +-  (1.69)   Depth: 4/9   00:00:00
>1.Rd5 Kg7 2.Kf3 Kf6 3.Ke4
>  +-  (1.78)   Depth: 5/11   00:00:00  1kN
>1.Rd5 Kg7 2.Kf3 Kf6 3.Ke4 Ke6
>  +-  (1.72)   Depth: 6/13   00:00:00  3kN
>1.Rd5 Kg7 2.Kf3 Kf6 3.Ke4 Ke6 4.g4
>  +-  (1.75)   Depth: 7/13   00:00:00  6kN
>1.Rd5 Kg7 2.Kf3 Kf6 3.Ke4 Ke6 4.g4 f6
>  +-  (1.75)   Depth: 8/17   00:00:00  13kN
>1.Rd5 Kg7 2.Kf3 Kf6 3.Ke4 Ke6 4.g4 f6 5.f4
>  +-  (1.84)   Depth: 9/17   00:00:00  37kN
>1.Rd5 Kg7 2.Kf3 Kf6 3.Ke4 Ke6 4.g4 Rc6 5.Re5+ Kd7
>  +-  (1.84)   Depth: 10/20   00:00:00  96kN
>1.Rd5 Kg7 2.Kf3 Kf6 3.g4 Ke6 4.Ke4
>  +-  (1.81)   Depth: 11/22   00:00:00  196kN
>1.Rd5 Kg7 2.Kf3 Kf6 3.g4 Ke6 4.Ke4 Rc6 5.Kd4 Rc2
>  +-  (1.78)   Depth: 12/23   00:00:01  351kN
>1.Rd5 Kg7 2.Kf3 Kf6 3.g4 Ke6 4.Ke4 Rc6 5.Re5+ Kd7
>  +-  (1.78)   Depth: 13/24   00:00:01  706kN
>1.Rd5 Kg7 2.Kf3 Kf6 3.g4 Ke6 4.Ke4 Rc6 5.Re5+ Kd6
>  +-  (1.78)   Depth: 14/30   00:00:02  1375kN
>1.Rd5 Kg7 2.Kf3 Kf6 3.g4 Ke6 4.Ke4 Rc6 5.Re5+ Kd6
>  +-  (1.75)   Depth: 15/28   00:00:07  4822kN, tb=3
>1.Rd5 Kg7 2.Kf3 Kf6 3.Ke3 Ke6 4.Kd4 h5 5.f3 Ra7
>  +-  (1.78)   Depth: 16/31   00:00:18  13319kN, tb=16
>1.Rd5 Kg7 2.Kf3 Kf6 3.g4 Ke6 4.Rb5 Kd7 5.Ke4 Re6+
>  +-  (1.78)   Depth: 17/34   00:00:42  31519kN, tb=69
>1.Rd5 Kg7 2.Kf3 Kf6 3.g4 Ke6 4.Rb5 Kd7 5.Ke4 Re6+
>  +-  (1.81)   Depth: 18/36   00:02:00  87747kN, tb=311
>1.Rd5 Kg7 2.h5 Kf6 3.f4
>  +-  (1.88)   Depth: 19/37   00:08:02  373779kN, tb=3743
>
>(R, MyTown 12.03.2001)
>
>
>
>Alekhine - Capablanca
>[D]8/5p1k/r5pp/P7/3R3P/6P1/5PK1/8 w - - 0 1
>
>Analysis by Junior 6.0:
>
>1.h5 Rxa5 2.hxg6+ fxg6
>  ²  (0.51)   Depth: 3   00:00:00
>1.Rd7 Rxa5 2.Rxf7+ Kg8
>  ±  (1.07)   Depth: 3   00:00:00
>1.Rd5 Kg7
>  ±  (1.26)   Depth: 3   00:00:00
>1.Rd5 Kg7 2.h5 g5
>  ±  (1.26)   Depth: 6   00:00:00
>1.Rd5 Kg7 2.h5 g5 3.Kf3
>  ±  (1.26)   Depth: 9   00:00:00  5kN
>1.Rd5 h5 2.Kf3 Kg7 3.Kf4 Rf6+ 4.Ke3 Ra6
>  ±  (1.24)   Depth: 12   00:00:00  65kN
>1.Rd5 h5 2.Kf3 Kg7 3.Ke4 Re6+ 4.Re5 Ra6 5.f3 Kf6
>  ±  (1.26)   Depth: 15   00:00:01  323kN, tb=1
>1.Rd5 h5 2.Kf3 Rf6+ 3.Ke3 Kg7 4.f3 Re6+ 5.Kf4 Rf6+ 6.Ke4 Re6+
>  ±  (1.29)   Depth: 18   00:00:06  2587kN, tb=79
>1.Rd5 h5 2.f3 Kh6 3.g4 hxg4 4.fxg4 Kg7 5.Kf3 Kf6 6.h5 gxh5 7.gxh5
>  ±  (1.34)   Depth: 20   00:00:18  11134kN, tb=429
>1.Rd5 h5 2.f3 Kg8 3.g4 hxg4 4.fxg4 Kg7 5.Kf3
>  ±  (1.34)   Depth: 22   00:00:51  33790kN, tb=1750
>1.Rd5 h5 2.f3 Kh6 3.Rb5 f6 4.Kf2 Kh7 5.Ke3 Kg7 6.Kf4 Kh6
>  ±  (1.33)   Depth: 23   00:01:55  75211kN, tb=6538
>1.Rd5 h5 2.f3 f6 3.g4 hxg4 4.fxg4 Rc6 5.Rb5 Rc2+ 6.Kg3 Rc3+ 7.Kf4 Rc4+ 8.Kf3
>Rc3+
>  ±  (1.36)   Depth: 24   00:04:09  169764kN, tb=14803
>1.Rd5 h5 2.f3 f6 3.g4 hxg4 4.fxg4 Rc6 5.Rb5 Rc2+ 6.Kg3 Rc3+ 7.Kf4 Rc4+ 8.Kf3
>Rc3+
>  ±  (1.36)   Depth: 25   00:07:29  308146kN, tb=34242
>
>(R, MyTown 12.03.2001)



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