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Subject: Re: Buggy eval from shredder 8

Author: John Merlino

Date: 12:34:53 09/18/04

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On September 18, 2004 at 10:19:00, Vincent Lejeune wrote:

>
>[d]2k4r/1pp2pp1/pbp5/7p/1P2P1bq/5P1P/P1PQ1P2/1RB1R1K1 w - - 0 17
>
>Analysis by Shredder 8:
>17.fxg4 hxg4 18.Te3 g3 19.fxg3 Fxe3+ 20.Dxe3 Dxh3 21.Rf2 Dh2+ 22.Rf3 Dh1+ 23.Rf4
>Th6 24.e5 g5+ 25.Rf5 Df1+ 26.Re4 Dc4+ 27.Dd4 Dxc2+ 28.Dd3 Dg2+ 29.Df3 Dxa2
>30.Dxf7 Dxf7 31.Fxg5
>  -+  (-3.56)   Profondeur: 16/51   00:02:08  52130kN
>
>This -3.56 is totally unrealistic, even Shredder is unable to find a score lower
>than -1.00  in folling moves !!!
>
>the game :
>
>[Event "Blitz:2'"]
>[Site "MyTown"]
>[Date "2004.09.17"]
>[Round "?"]
>[White "Pierre"]
>[Black "Vin"]
>[Result "*"]
>[PlyCount "41"]
>
>1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Bxc6 dxc6 5. O-O Bg4 6. d3 h5 7. Nbd2 Qf6 8.
>Re1 Bc5 9. Rb1 Ne7 10. b4 Bb6 11. h3 Ng6 12. d4 O-O-O 13. dxe5 Nxe5 14. Qe2
>Rxd2 15. Qxd2 Nxf3+ 16. gxf3 Qh4 17. fxg4 hxg4 18. Re3 g3 19. fxg3 Bxe3+ 20.
>Qxe3 Qxh3 21. Kf2 *

The big disaster in the PV from Shredder is 30.Qxf7??. This move, of course,
loses instantly for White. 30.Rb3 might win for White.

As for the initial position, CM9_SKR says draw all the way:

Time	Depth	Score	Positions	Moves
0:00	1/3	-7.64	590		17.hxg4 hxg4 18.Qd8+ Kxd8
0:00	1/3	1.94	793		17.fxg4 Qg3+ 18.Kf1 Qxh3+ 19.Ke2
					hxg4
0:00	1/4	1.94	10740		17.fxg4 Qg3+ 18.Kf1 Qxh3+ 19.Ke2
					hxg4
0:00	1/5	1.50	24761		17.fxg4 Qg3+ 18.Kf1 Qxh3+ 19.Ke2
					Qxg4+ 20.Kf1 Qh3+ 21.Kg1
0:00	1/6	1.05	47599		17.fxg4 Qg3+ 18.Kf1 Qxh3+ 19.Ke2
					Qxg4+ 20.f3 Qg2+ 21.Kd1 Qxf3+ 22.Qe2
0:00	1/7	0.00	61620		17.fxg4 Qg3+ 18.Kf1 Qxh3+ 19.Ke2
					Qxg4+ 20.Kf1 Qh3+ 21.Kg1 Qg3+ 22.Kf1
					Qh3+
0:00	1/8	0.00	106705		17.fxg4 Qg3+ 18.Kf1 Qxh3+ 19.Ke2
					Qxg4+ 20.Kf1 Qh3+ 21.Kg1 Qg3+ 22.Kf1
					Qh3+
0:01	1/9	0.00	196408		17.fxg4 Qg3+ 18.Kf1 Qxh3+ 19.Ke2
					Qxg4+ 20.Kf1 Qh3+ 21.Ke2 Qg4+
0:01	2/10	0.00	370968		17.fxg4 Qg3+ 18.Kf1 Qxh3+ 19.Ke2
					Qxg4+ 20.Kf1 Qh3+ 21.Ke2 Qg4+
0:04	2/11	0.00	887329		17.fxg4 Qg3+ 18.Kf1 Qxh3+ 19.Ke2
					Qxg4+ 20.Kf1 Qh3+ 21.Ke2 Qg4+
0:09	2/12	0.00	2245450		17.fxg4 Qg3+ 18.Kf1 Qxh3+ 19.Ke2
					Qxg4+ 20.Kf1 Qh3+ 21.Ke2 Qg4+
0:49	3/13	0.00	12246266	17.fxg4 Qg3+ 18.Kf1 Qxh3+ 19.Ke2
					Qxg4+ 20.Kf1 Qh3+ 21.Ke2 Qg4+

jm



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