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Subject: Re: Mystery - why b6?

Author: Reinhard Scharnagl

Date: 12:09:40 05/29/05

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On May 29, 2005 at 13:44:31, Jack Lad wrote:

>[d] 8/8/P3kp2/1PR4p/4bp1P/2K3P1/8/8 w
>
>1.gxf4 is better and leads to a quicker win than 1.b6 so why do engines prefer
>the latter?  Or maybe your engine doesn't - let me know please.

a) what Smirf is thinking here:

01:25.2 (27.01+) +6.890 1.gxf4 (==0==) Kd6 2.Rc4 Bd5 3.Rd4 Ke6 4.b6 Bf3 5.b7 Kf7
6.b8=Q Be2 7.Qc7+ Kg6 8.Rd3 Bxd3
01:06.0 (26.01=) +6.890 1.gxf4 (==0==) Kd6 2.Rc4 Bd5 3.Rd4 Ke6 4.b6 Bf3 5.b7 Kf7
6.b8=Q Be2 7.Qc7+ Kg6 8.Rd3 Bxd3
00:52.5 (25.01=) +7.057 1.gxf4 (==0==) Kd6 2.Rc4 Bf3 3.b6 Ke7 4.b7 Kf7 5.b8=Q
Ke6 6.Qc8+ Kd6 7.Qc7+ Ke6 8.Rc6+ Bxc6
00:40.4 (25.01+) +6.751 1.gxf4 (==0==) Kd6 2.Rc4 Bd5 3.Rd4 Kc5 4.Rxd5+ Kxd5 5.a7
f5 6.a8=Q+ Kd6 7.Qc6+ Ke7 8.Qc7+ Ke6
00:32.8 (24.01=) +6.751 1.gxf4 (==0==) Kd6 2.Rc4 Bd5 3.Rd4 Kc5 4.Rxd5+ Kxd5 5.a7
f5 6.a8=Q+ Kd6 7.Qc6+ Ke7 8.Qc7+ Ke6
00:27.5 (24.01+) +6.607 1.gxf4 (==0==) Kd6 2.Rc4 Bd5 3.Rd4 Ke6 4.Rxd5 Ke7 5.Kd3
Ke6 6.Rxh5 f5 7.Rxf5 Kxf5 8.a7 Ke6
00:22.2 (23.01+) +6.607 1.gxf4 (==0==) Kd6 2.Rc4 Bd5 3.Rd4 Ke6 4.Rxd5 Ke7 5.Kd3
Ke6 6.a7 Kxd5 7.a8=Q+ Kc5 8.Qc6+ Kb4
00:18.1 (22.01=) +6.607 1.gxf4 (==0==) Kd6 2.Rc4 Bd5 3.Rd4 Ke6 4.Rxd5 Ke7 5.Kd3
Ke6 6.a7 Kxd5 7.a8=Q+ Kc5 8.Qc6+ Kb4
00:15.2 (22.01+) +6.415 1.gxf4 (==0==) Kd6 2.Rc4 Bd5 3.Rd4 Kc5 4.Rxd5+ Kxd5 5.a7
f5 6.a8=Q+ Kd6 7.Qc6+ Ke7 8.Qc7+ Ke6
00:12.8 (21.01=) +6.415 1.gxf4 (==0==) Kd6 2.Rc4 Bd5 3.Rd4 Kc5 4.Rxd5+ Kxd5
5.Kb4 Ke4 6.a7 f5 7.a8=Q+ Kxf4 8.Kc3 Ke3
00:10.8 (21.01+) +6.228 1.gxf4 (==0==) Kd6 2.Rc4 Bf3 3.b6 Be2 4.b7 Bxc4 5.b8=Q+
Kd5 6.Qg8+ Kc5 7.Qxc4+ Kb6 8.Qb4+ Kxa6
00:08.8 (20.01+) +6.228 1.gxf4 (==0==) Kd6 2.Rc4 Bf3 3.b6 Be2 4.b7 Bxc4 5.b8=Q+
Kd5 6.Qg8+ Kc5 7.Qxc4+ Kb6 8.Qb4+ Kxa6
00:07.3 (19.01+) +6.228 1.gxf4 (==0==) Kd6 2.Rc4 Bf3 3.b6 Be2 4.b7 Bxc4 5.b8=Q+
Kd5 6.Qg8+ Kc5 7.Qxc4+ Kb6 8.Qb4+ Kxa6
00:05.7 (19.01+) +5.841 1.gxf4 (==0==) Kd6 2.b6 Kxc5 3.b7 Bc2 4.b8=Q Bd3 5.Kxd3
Kd5 6.Kc2 Kc4
00:03.7 (18.01+) +5.841 1.gxf4 (==0==) Kd6 2.Rxh5 Bf3 3.a7 Bxh5 4.a8=Q Bd1
5.Qc6+ Ke7 6.Qd5 Bb3
00:02.8 (17.01=) +5.841 1.gxf4 (==0==) Kd6 2.Rxh5 Bf3 3.a7 Kc7 4.Rh8 Kb6 5.a8=Q
Bxa8 6.Rxa8 Kxb5 7.Rf8 Kc5 8.Rxf6 Kd5
00:02.5 (17.01+) +5.759 1.gxf4 (==0==) Kd6 2.Rxh5 Kc7 3.Rh6 Kb6 4.Rxf6+ Kxb5
5.a7 Kc5 6.Rf8 Bf3
00:01.9 (16.01=) +5.759 1.gxf4 (==0==) Kd6 2.Rxh5 Kc7 3.Rh6 Kb6 4.Kb4 Ka7 5.Rxf6
Kb8 6.Rb6+
00:01.5 (16.01+) +5.567 1.gxf4 (==0==) Kd6 2.Rxh5 Kc7 3.Rh6 f5 4.b6+ Kd8 5.Rh8+
Kd7 6.Kb4 Kd6 7.b7 Bc6
00:01.4 (15.01+) +5.567 1.gxf4 (==0==) Kd6 2.Rxh5 Kc7 3.Rh6 f5 4.b6+ Kd8 5.Rh8+
Kd7 6.Kb4 Kd6 7.b7 Bc6
00:00.8 (14.01+) +5.761 1.gxf4 (==0==) f5 2.b6 Kd7 3.b7 Bc2
00:00.5 (14.01+) +5.374 1.gxf4 (==0==) f5 2.b6 Kd7 3.b7 Bc2
00:00.4 (13.01=) +5.374 1.gxf4 (==0==) Kd6 2.Rxh5 Kc7 3.Rh8 Kb6 4.Kb4 f5 5.Rh7
Bd5 6.Rb7+ Bxb7 7.a7
00:00.2 (12.01+) +5.283 1.gxf4 (==0==) f5 2.b6 Kd7 3.b7 Bc2
00:00.1 (10.01=) +5.225 1.gxf4 (==0==) Kd7 2.b6 Kd6 3.Rxh5 Ke6 4.b7 f5 5.b8=Q
Kd5
00:00.0 (05.01=) +4.920 1.gxf4 (==0==) Ke7 2.Rxh5 f5



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