Author: Rafael Andrist
Date: 04:21:52 10/13/01
Go up one level in this thread
On October 13, 2001 at 06:22:23, Simon Finn wrote:
>On October 13, 2001 at 05:49:26, Rafael Andrist wrote:
>
>>On October 13, 2001 at 05:21:54, Rafael Andrist wrote:
>>
>>>On October 12, 2001 at 13:01:35, Dann Corbit wrote:
>>>
>>>>Four positions from a pawn test suite I am working on...
>>>>The first three have clear, alternate checkmates.
>>>>The last one, I have not been able to solve yet (maybe just really hard).
>>>>
>>>>[D]3k4/2p5/1pKp4/p2P4/2P5/P7/1P6/8 w - - bm c5; id "J&S45.10"; c0 "This one is
>>>>questionable.";
>>>
>>>analysis by Wilhelm
>>
>>> 13 4s 0.06 124227 4680 b2-b4 a5xb4 a3xb4 Kd8-c8 Kc6-b5
>>>Kc8-d8 Kb5-a4 Kd8-e7 Ka4-b3 Ke7-f6 Kb3-c3 Kf6-e5 Kc3-d3
>>> 14 11s 0.08 298967 12811 c4-c5 b6xc5 Kc6-b5 Kd8-d7 a3-a4
>>>c5-c4 Kb5xa5 c7-c6 d5xc6+ Kd7xc6! Ka5-b4 d6-d5 a4-a5 Kc6-b7 Kb4-c5
>>> 15 21s 0.08 612393 21205 c4-c5 b6xc5 Kc6-b5 Kd8-d7 a3-a4
>>>c5-c4 Kb5xa5 c7-c6 d5xc6+ Kd7xc6! Ka5-b4 d6-d5 a4-a5 Kc6-b7 Kb4-c5
>>> 16 38s 0.49 1127757 43197 c4-c5 b6xc5 Kc6-b5 Kd8-d7 a3-a4
>>>c5-c4 Kb5xa5 c7-c6 d5xc6+ Kd7xc6! Ka5-b4 d6-d5 a4-a5 Kc6-d6 a5-a6 Kd6-c6 a6-a7
>>>
>>>Wilhelm seems to prefer c5, but the score isn't convincing.
>>>
>>
>>Later it went for Kb7, with a score of 0.85. After doing some pv moves and going
>>back again etc. I got the following line, which seems winning.
>>
>>1. Kc6-b7 {20/31/36 0.85} Kd8-d7 {16/24/26 0.85} 2. a3-a4 {18/27/29 0.85}
>>Kd7-d8 {18/28/30 0.87} 3. c4-c5 {17/27/30 0.87} b6xc5 {16/26/29 0.87} 4.
>>Kb7-a6 {15/20/23 0.87} Kd8-d7 {15/20/25 0.87} 5. Ka6-b5 {16/25/27 1.71}
>>Kd7-c8 {16/26/30 1.76} 6. Kb5xa5 {16/28/31 1.78} Kc8-b8 {16/25/28 1.80} 7.
>>Ka5-b5 {17/28/30 2.19} Kb8-b7 {18/28/32 3.84}
>
>In this line, 3 dxc5 seems to draw.
>
>For example,
>
>3...dxc5 4. Kc6 Kc8 5. d6 cxd6 6. Kxd6 Kb7 7. Kd7 b5
> 6. Kxb6 Kd7 7. b3 Ke6 8. Kxa5 d5
>
>Simon
Yes, your right. After 3... dxc5 4.Kc6 Kc8 my program sees a draw at depth 20.
16 10s 1.11 321138 14230 b2-b3 Kc8-d8 d5-d6 c7xd6 Kc6xd6
b6-b5 a4xb5 a5-a4 b3xa4 c5-c4 b5-b6 Kd8-c8 Kd6-c6 c4-c3 b6-b7+ Kc8-b8! a4-a5
17 14s 1.11 462329 19006 b2-b3 Kc8-d8 d5-d6 c7xd6 Kc6xd6
b6-b5 a4xb5 a5-a4 b3xa4 c5-c4 b5-b6 Kd8-c8 Kd6-c6 c4-c3 b6-b7+ Kc8-b8! a4-a5
18 30s 0.49 857971 73686 b2-b3 Kc8-d8 d5-d6 c7xd6 Kc6xd6
b6-b5 a4xb5 c5-c4 b3xc4 a5-a4 b5-b6 Kd8-c8 Kd6-d5 Kc8-b7 c4-c5 a4-a3 Kd5-d4
a3-a2
19 46s 0.65 1207132 118407 b2-b3 Kc8-d8 d5-d6 c7xd6 Kc6xd6
b6-b5 a4xb5 c5-c4 b3xc4 a5-a4 b5-b6 Kd8-c8 Kd6-c5 Kc8-b7 Kc5-b5 a4-a3 c4-c5
a3-a2 c5-c6+
20 134s 0.01 3153108 319740 b2-b3 Kc8-d8 d5-d6 c7xd6 Kc6xd6
b6-b5 Kd6xc5 b5xa4 b3xa4 Kd8-d7 Kc5-b5 Kd7-d6 Kb5xa5 Kd6-c7 Ka5-b4 Kc7-d6 Kb4-b3
Kd6-d5 Kb3-b2 Kd5-d6
21 338s 0.01 6892448 1001191 b2-b3 Kc8-d8 d5-d6 c7xd6 Kc6xd6
b6-b5 Kd6xc5 b5xa4 b3xa4 Kd8-d7 Kc5-b5 Kd7-d6 Kb5xa5 Kd6-c7 Ka5-b4 Kc7-d6 Kb4-b3
Kd6-d5 Kb3-b2 Kd5-d6 Kb2-b1
Rafael B. Andrist
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