Author: Mark Rawlings
Date: 06:01:44 08/29/99
Go up one level in this thread
On August 28, 1999 at 19:55:25, Howard Exner wrote:
>On August 28, 1999 at 11:07:45, Mark Rawlings wrote:
>
>>On August 28, 1999 at 09:36:58, Howard Exner wrote:
>>
>>>On August 27, 1999 at 13:57:54, Mark Rawlings wrote:
>>>
>>>>I let Crafty with 3+2 tablebases chew on this one overnight after the moves c5
>>>>bxc5. After 25 ply, the eval was still +1.07 (Be1 Kc7 Ba5+ Kb8...) This one is
>>>>really deep!
>>>>
>>>>Mark
>>>
>>>What line of play is Crafty producing?
>>
>>Here's the Crafty output:
>>
>>
>
>> 25 463:44 1.07 2. Be1 Kc7 3. Ba5+ Kb8 4. Ke3 Bd4+
>> 5. Ke2 Bf6 6. Kd3 Bb2 7. Kd2 Bf6 8.Ke3 <HT>
>
>How does Crafty play these lines as black?
>I've always wanted to fiqure this position out and now with the
>thre of us maybe we can do it.
>
>A.1. c5 bxc5 2. Be1 Kb8 3. Ba5 Kc8 4. b6 axb6 5. Bxb6 Kb8 6. Kc4 Bd4 7. Bd8
>Be3 8. Bxh4 Bxf4 9. Bf6 Bg3 10. h4 f4 11. Kd3 f3 12. Ke3 f2 13. Ke2 Ka7
>14. h5 Bf4 15. Bg7 Kxa6 16. Kxf2 Kb5 17. Kf3 Bg5 18. h6
>
>B.1. c5 bxc5 2. Be1 Kb8 3. Ba5 Kc8 4. b6 axb6 5. Bxb6 Kb8 6. Kc4 Kc8 7. Kb5
>Kb8 8. Kc6 Be7 9. Kd7 Bf8 10. Ke6
After 3. Ba5 crafty has the following:
19-> 4:06 -1.22 3. ... Bb2 4. Bd8 Bc1 5. Bxh4 Bxf4
6. Be1 Ka8 7. h4 Kb8 8. h5 Bh6 9. Bd2
f4 10. Ke4 f3 11. Be3 f2 12. Bxf2 Kc7
13. Be3
20 8:06 -1.18 3. ... Bb2 4. Bd8 Bc1 5. Bxh4 Bxf4
6. Be1 Bh6 7. h4 Kc7 8. Ba5+ Kc8 9.
b6 axb6 10. Bxb6 Kb8 11. h5 f4 12.
Ke4 Kc8 13. Kf3 c4 14. a7 Kb7
20-> 15:37 -1.18 3. ... Bb2 4. Bd8 Bc1 5. Bxh4 Bxf4
6. Be1 Bh6 7. h4 Kc7 8. Ba5+ Kc8 9.
b6 axb6 10. Bxb6 Kb8 11. h5 f4 12.
Ke4 Kc8 13. Kf3 c4 14. a7 Kb7
21 28:26 -1.34 3. ... Bb2 4. Bd8 Bc1 5. Bxh4 Bxf4
6. Be7 Be5 7. h4 Kc7 8. h5 Bf4 9. Bf6
Kb6 10. Kc4 <HT>
No sure thing yet for white. After 10. Ke6 in your line B.1. above, it looks
like a win for white:
16-> 43.96 -3.28 8. ... Ka8 9. Kxf5 Bh6 10. Kg4 Bg7
11. Kh5 c4 12. Kg6 Bf8 13. f5 c3 14.
Bd4 c2 15. Be3 <HT>
17 1:13 -3.56 8. ... Ka8 9. Kxf5 Bh6 10. Kg4 c4 11.
Be3 c3 12. Kh5 Bf8 13. Kg6 Be7 14.
f5 Bd8 15. f6 Kb8 16. f7 <HT>
17-> 1:52 -3.56 8. ... Ka8 9. Kxf5 Bh6 10. Kg4 c4 11.
Be3 c3 12. Kh5 Bf8 13. Kg6 Be7 14.
f5 Bd8 15. f6 Kb8 16. f7 <HT>
18 2:04 -- 8. ... Ka8
18 4:31 -6.45 8. ... Ka8 9. Kxf5 c4 10. Kg6 c3 11.
f5 c2 12. Be3 Be7 13. f6 Bd8 14. Kg7
Kb8 15. f7 Be7 16. f8=Q+ Bxf8+ 17.
Kxf8 <HT>
I'll try to find the web site with the solutions to these. Maybe it has the
winning line. (If not, it probably isn't a very good problem for a test suite!)
Mark
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