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Subject: Re: Testposition: Queen ending

Author: Roy Eassa

Date: 15:37:16 01/30/02

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On January 30, 2002 at 11:58:49, Andrew Smith wrote:

>This is an interesting position. In particular, the fourth move in the winning
>line. Qg7 Kh2 f8Q Qb6+ Kh6 *Bc6*. Other moves are possibly winning but 4. Bc6
>looks to be the best by far. I let gambit tiger analyse this over night, and it
>couldn't come up with 4. Bc6. What do other programs think here on fast
>hardware? Can they find Bc6 in the initial position?
>
>[D]5Q2/5P1b/8/7K/8/1q4k1/1p4B1/8 w - - 0 1


Analysis by Fritz 7 (AMD 1.2):

1.Qg7+ Kh2 2.f8Q Qb5+ 3.Kh6 Qb6+ 4.Kxh7 b1Q+ 5.Kh8 Qb8 6.Qfg8 Qxg8+ 7.Kxg8
  +-  (1.60)   Depth: 7/23   00:00:00  232kN
1.Qg7+!
  +-  (1.88)   Depth: 8/23   00:00:00  308kN
1.Qg7+ Kh2 2.f8Q Qb5+ 3.Kg4 Bf5+ 4.Qxf5 Qxf5+ 5.Kxf5 b1Q+ 6.Be4 Qf1+ 7.Ke6 Qh3+
8.Kd5
  +-  (1.94)   Depth: 8/23   00:00:00  426kN
1.Qg7+ Kh2 2.f8Q Qb5+ 3.Kg4 Bf5+ 4.Qxf5 Qxf5+ 5.Kxf5 b1Q+ 6.Be4 Qf1+ 7.Ke6 Qe2
8.Qe5+
  +-  (1.75)   Depth: 9/25   00:00:01  1042kN
1.Qg7+ Kh2 2.f8Q Qb5+ 3.Kh6 Qb6+ 4.Kxh7 b1Q+ 5.Kh8 Qb8 6.Bd5 Qxf8+ 7.Qxf8 Qg6
  +-  (1.50)   Depth: 10/30   00:00:04  3064kN
1.Qg7+ Kh2 2.f8Q Qb5+ 3.Kh6 Qb6+ 4.Kxh7 b1Q+ 5.Kh8 Qb8 6.Bd5 Qxf8+ 7.Qxf8 Qa1+
8.Kg8
  +-  (1.47)   Depth: 11/30   00:00:13  9070kN
1.Qg7+ Kh2 2.f8Q Qb5+ 3.Kh6 Qb6+ 4.Kxh7 b1Q+ 5.Kh8 Qb8 6.Bd5 Qxf8+ 7.Qxf8 Qa1+
8.Kg8
  ±  (1.35)   Depth: 12/33   00:00:35  24340kN
1.Qg7+!
  +-  (1.63)   Depth: 13/33   00:01:03  43219kN
1.Qg7+!
  +-  (1.91)   Depth: 13/33   00:01:06  45224kN
1.Qg7+!
  +-  (2.47)   Depth: 13/33   00:01:09  47283kN
1.Qg7+ Kh2 2.f8Q Qb5+ 3.Kh6 Qb6+ 4.Bc6 Qxc6+ 5.Kxh7 b1Q+ 6.Kh8 Qg2 7.Qh6+ Kg1
8.Qc5+
  +-  (9.44)   Depth: 13/37   00:01:43  70103kN
1.Qg7+ Kh2 2.f8Q Qb5+ 3.Kh6 Qb6+ 4.Bc6 Qxc6+ 5.Kxh7 b1Q+ 6.Kh8 Qbg6 7.Qe5+ Kg2
8.Qe2+
  +-  (9.50)   Depth: 14/39   00:03:24  139929kN



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