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Subject: Re: Test Position: Shredder 8 Blunder? (Ambiguous)?

Author: D.B. Morris

Date: 16:16:01 12/16/04

Go up one level in this thread


On December 16, 2004 at 15:46:26, paul bedrey wrote:

>On December 16, 2004 at 14:19:01, John Merlino wrote:
>
>>On December 16, 2004 at 13:50:26, paul bedrey wrote:
>>
>>>Looking through a game between Shredder 8 and Junior 9 posted by Thomas Logan I
>>>came upon this critical point in the game:
>>>
>>>[D]5rk1/6q1/4r2p/1BPp1R2/P2Pn3/3Q2p1/4R1P1/6K1 w - - 0 43


(I'm getting 2 different results in analysis:
New game
5rk1/6q1/4r2p/1BPp1R2/P2Pn3/3Q2p1/4R1P1/6K1 w - - 0 1

Analysis by Shredder 8:

±  (1.40) 1.Rxf8+ Qxf8   00:00:00
±  (1.40) 1.Rxf8+ Qxf8   00:00:00
+-  (2.30) 1.Rxd5 Qf7   00:00:00
+-  (2.30) 1.Rxd5 Qf7   00:00:00
+-  (2.30) 1.Rxd5 Qf7   00:00:00
+-  (2.30) 1.Rxd5 Qf7   00:00:00
+-  (2.30) 1.Rxd5 Qf7   00:00:00
+-  (2.30) 1.Rxd5 Qf7   00:00:00
+-  (2.30) 1.Rxd5 Qf7   00:00:00
+-  (2.30) 1.Rxd5 Qf7   00:00:00
+-  (2.30) 1.Rxd5 Qf7   00:00:00
+-  (2.30) 1.Rxd5 Qf7 2.Rxe4 Rxe4 3.Qxe4   00:00:00
+-  (2.30) 1.Rxd5 Qf7 2.Rxe4 Rxe4 3.Qxe4   00:00:00
+-  (2.30) 1.Rxd5 Qf7 2.Rxe4 Rxe4 3.Qxe4   00:00:01
+-  (2.30) 1.Rxd5 Qf7 2.Rxe4 Rxe4 3.Qxe4   00:00:02
+-  (2.30) 1.Rxd5 Qf7 2.Rxe4 Rxe4 3.Qxe4   00:00:05
+-  (2.05) 1.Rxd5 Qf7 2.Rxe4 Qf2+ 3.Kh1 Qe1+ 4.Qf1 Rxf1+ 5.Bxf1 Rxe4 6.Rf5
00:00:10
+-  (2.05) 1.Rxd5 Qf7 2.Rc2 Nxc5 3.Qxg3+ Rg6 4.Qh3 Nxa4 5.Rd7 Nb6 6.Rxf7 Rxg2+
7.Kxg2   00:00:23
+-  (1.80) 1.Rxd5 Qg4 2.Bd7 Ref6 3.Rf5 Rxf5 4.Be6+ Kg7 5.Bxf5 Qxf5 6.Qxe4 Qf1#
00:01:05
+-  (1.80) 1.Rxd5 Qg4 2.Bc4 Kh8 3.Rd8 Rxd8 4.Bxe6 Nxc5 5.Bxg4 Nxd3 6.a5 Rxd4
7.Kh1 Rxg4 8.Re8+   00:01:11
+-  (2.05) 1.Rxd5 Qg4 2.Bc4 Kh8 3.Rd8 Rxd8 4.Bxe6 Nxc5 5.Bxg4 Nxd3 6.Re4 Nf2
7.Rf4 Nxg4 8.Rxg4 Rg8 9.Rxg8+ Kh7   00:02:27
+-  (2.05) 1.Rxd5 Qg4 2.Bc4 Kh8 3.Rd8 Rxd8 4.Bxe6 Nxc5 5.Bxg4 Nxd3 6.Re4 Nf2
7.Rf4 Re8 8.Kf1 Nd3 9.Kg1 Nxf4   00:02:35
+-  (1.80) 1.Rxd5 Qg4 2.Bc4 Kh8 3.Rd8 Rxd8 4.Bxe6 Nxc5 5.Bxg4 Nxd3 6.Re4 Nf2
7.Rf4 Re8 8.Kf1 Nd3 9.Bf5 Nxf4 10.Bd7   00:03:07
±  (1.30) 1.Rxd5 Qg4 2.Bc4 Kh8 3.Rd8 Rxd8 4.Bxe6 Nxc5 5.Bxg4 Nxd3 6.Re4 Nf2
7.Rf4 Re8 8.Kf1 Nd3 9.Kg1 Nxf4 10.Bd7 Nxg2   00:03:15

(No change after 13 minutes with “scroll main line” checked)

However... (with nothing checked)

New game
5rk1/6q1/4r2p/1BPp1R2/P2Pn3/3Q2p1/4R1P1/6K1 w - - 0 1

Analysis by Shredder 8:

1.Rxf8+ Qxf8 2.Bd7 Re7 3.c6 Qf4 4.Qe3 Qh4 5.Bh3 Qf6 6.Rc2 Rf7 7.Qd3 Kh8 8.a5 Rc7
9.Bd7 Qh4 10.Qe3 Qh2+ 11.Kf1 Qh1+ 12.Ke2 Qxg2+ 13.Kd3 Qh1 14.Qc1
+-  (1.53)    Depth: 15/43   00:02:20  41070kN

New game
5rk1/6q1/4r2p/1BPp1R2/P2Pn3/3Q2p1/4R1P1/6K1 w - - 0 1

Analysis by Shredder 8:

1.Rxf8+ Kxf8 2.c6 Qg5 3.Qf3+ Kg8 4.a5 Re7 5.Rxe4 dxe4 6.Kh1 exf3 7.gxf3 Qxb5
8.Kg2 Qxa5 9.c7 Rxc7
±  (0.78)    Depth: 16/48   00:06:00  103222kN

I'm not sure why they're so different...but there it is :-)

D.B.M.









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