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Subject: Re: Shredder5.32's problems in the endgame

Author: Steven J. Brann

Date: 04:58:01 08/21/01

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On August 20, 2001 at 17:05:35, Uri Blass wrote:

>Here is some analysis of shredder5.32 p200(64 Mbytes hash tables)
>
>Diep blundered in the relevant position by Kc5 when g4 is winning.
>The surprising thing is that Shredder also cannot see g4 in  a reasonable time
>and need more than 5 hours on p200 to avoid Kc5 (it probably means that Shredder
>with the best hardware of today cannot avoid Kc5 at tournament time control).
>
>h5 is probably enough to win(I did not analyze it and I may be wrong) but g4 is
>the simplest way to win
>
>I thought that Shredder is better in the endgame than other programs but I doubt
>it after seeing that shredder also does the same mistake that Diep did when Deep
>Fritz has no problem to find the right move with a winning score.
>
>,M - Shredder 5.32
>2b5/7p/P2k4/1P4p1/2Ppp3/5pP1/1N3K1P/8 b - - 0 1
>

Chessmaster 8000 with custom personality finds ...g4 in less than a second and
with time, the evaluation improves for black.  PIII 933 with 64MB hash.

Time	Depth	Score	Positions	Moves
0:00	1/4	-0.01	3383		1...g4 2. Nd1 Kc5 3. a7 e3+ 4.
					Nxe3 dxe3+ 5. Kxe3
0:00	1/5	0.01	8538		1...g4 2. Ke1 e3 3. Nd3 Kc7 4. c5
0:00	1/6	-0.09	14785		1...g4 2. Ke1 e3 3. Nd3 Kc7 4.
					a7 Kb7 5. b6
0:00	2/7	-0.34	43920		1...g4 2. Ke1 Kc5 3. a7 Bb7 4.
					Na4+ Kxc4 5. b6 e3
0:01	3/8	-0.44	133811		1...g4 2. a7 Bb7 3. Na4 e3+ 4.
					Ke1 f2+ 5. Kf1 Kc7 6. b6+ Kc6 7.
					h3 gxh3
0:03	4/9	-0.57	346507		1...g4 2. Ke1 Kc5 3. Kf1 e3 4.
					a7 Bb7 5. Na4+ Kxc4 6. b6 e2+ 7.
					Ke1
0:10	5/10	-0.88	1350732		1...g4 2. Ke1 Kc5 3. Kf1 e3 4.
					Ke1 d3 5. Kd1 d2 6. Na4+ Kxc4
0:19	6/11	-0.91	2683018		1...g4 2. Ke1 Kc5 3. Kf1 e3 4.
					Ke1 d3 5. Nxd3+ Kxc4 6. a7 Bb7
					7. Ne5+ Kxb5 8. Nxg4
0:57	7/12	-0.94	7724830		1...g4 2. Ke1 Kc5 3. Kf1 e3 4.
					Ke1 f2+ 5. Ke2 Bf5 6. Kf1 Be4 7.
					h3 gxh3
2:59	8/13	-1.20	24568806	1...g4 2. Ke1 Kc5 3. Kf1 e3 4.
					Ke1 f2+ 5. Ke2 Bf5 6. Kf1 Be4 7.
					h3 gxh3 8. Na4+ Kxc4
7:15	9/14	-2.06	60466496	1...g4 2. Ke1 Kc5 3. Kf1 e3 4.
					Ke1 f2+ 5. Ke2 Bf5 6. Kf1 Be4 7.
					a7 Kb6 8. a8=Q Bxa8 9. Na4+ Kc7
					10. c5
Steve



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