Author: Robert Hyatt
Date: 08:47:56 07/18/02
Go up one level in this thread
On July 18, 2002 at 09:22:00, Uri Blass wrote:
>On July 18, 2002 at 08:40:44, Michael Diosi wrote:
>
>>Hi there,
>>
>>if i remember right this the position Botwinik used to poit out the performance
>>of his program Pionier. If so then this is not a draw but a win for white. I
>>don't have the moves now, but i can look it up, or maybe someone else can do
>>this.
>>
>>Michael
>
>You remember correctly and the right line is Ba3 Qxa3 Nh5+
>
>Ba3 is easy to find because of the draw and the real test position is to
>find Nh5+ in the following position:
>
>[D]8/p5kp/1p2Pnp1/3pQ3/2pP4/qnP3N1/6PP/6K1 w - - 0 2
>
>It is not very hard to fail high on Nh5+ but solving the fail high seems to be a
>very hard problem for movei on p800(16 mbytes hash tables) and it's branching
>factor is not good.
>
>10 0 1402 2362675 e5c7 g7h8 c7b8 h8g7 b8c7
>10 1 7747 12767894 g3h5
>10 374 75967 121755051 g3h5 g6h5 e5g5 g7f8 g5f6 f8g8 e6e7 a3c1 g1f2 c1c2 f2g3
>c2d3 g3h4 d3e4 h4h5 e4e2 h5h4 e2e1 h4h3 e1c3 h3g4 c3d4 f6d4 b3d4 e7e8q g8g7
>10 374 76287 122304866 g3h5 g6h5 e5g5 g7f8 g5f6 f8g8 e6e7 a3c1 g1f2 c1c2 f2g3
>c2d3 g3h4 d3e4 h4h5 e4e2 h5h4 e2e1 h4h3 e1c3 h3g4 c3d4 f6d4 b3d4 e7e8q g8g7
>
>Uri
In my case, Crafty doesn't _want_ a draw, because it believes white is
better. It finds Ba3 in 1:28 with a +2.6 score:
Nxe6 8. Nxa7
13 43.11 0.63 1. Nf1 Na5 2. Ne3 Nc6 3. Nxd5 Nxe5
4. Nxe7 Nd3 5. Ba3 Nf4 6. Nc8 Nxe6
7. Nxa7
13 1:28 ++ 1. Ba3!!
13 1:44 2.62 1. Ba3 Qxa3 2. Nh5+ gxh5 3. Qg5+ Kf8
4. Qxf6+ Kg8 5. Qf7+ Kh8 6. g3 Nxd4
7. e7 Qc1+ 8. Kg2 Qc2+ 9. Kh3 Qf5+
10. Qxf5 Nxf5 11. e8=Q+
(3) 13-> 1:44 2.62 1. Ba3 Qxa3 2. Nh5+ gxh5 3. Qg5+ Kf8
4. Qxf6+ Kg8 5. Qf7+ Kh8 6. g3 Nxd4
7. e7 Qc1+ 8. Kg2 Qc2+ 9. Kh3 Qf5+
10. Qxf5 Nxf5 11. e8=Q+
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