Author: Bas Hamstra
Date: 13:30:27 08/07/02
Go up one level in this thread
On August 07, 2002 at 09:35:59, Uri Blass wrote:
>On August 07, 2002 at 09:01:54, Bas Hamstra wrote:
>
>>>Has anybody looked at #8 - Rd1! wins the queen and the game but the bm given is
>>>Rg8
>>>
>>>[D] 3R4/5r1p/5ppk/8/1Q3PPq/5P2/6K1/8 w - - bm Rg8
>>>
>>
>>I let Tao run over night, hoping to find a mate. But it sticks to Rd1 and found
>>no better move. If there is a mate it is extremely deep.
>>
>>Best regards,
>>Bas.
>
>I think that this is simply a null move problem.
>I suggest that you give Tao Rg8 and analyze the position after Rg8.
>
>Movei does not see mate after Rg8 but can see a big advantage for white(10.37
>pawns at depth 10 and fail low at depth 11)
>
>Rd1 wins a queen for a rook when Rg8 wins a queen for nothing.
>
>The only line is Rg8 f5 g5+ and now yace says Kh5 mate in 8 against itself.
>
>When I go backward yace can see that Rg8 is a mate in 10.
>
>1.Rg8 f5 2.g5+ Kh5 3.Qd6 Qh1+ 4.Kxh1 Kh4 5.Kh2 Rb7 6.Qd2 Rb1 7.Qg2 Rb2 8.Qxb2
>Kh5 9.Kh1
> +- (#10) Depth: 1 00:00:00
>
>Uri
You are right, after Rg8 Tao finds mate, however not a mate in 10, but a
(probably supoptimal) mate in 16.
6 -806 220 15871 f6f5 g4g5 h6h5 b4d6 f7f6 g5f6 h4e1
6. -806 220 18394 f6f5 g4g5 h6h5 b4d6 f7f6 g5f6 h4e1
7 -1032 330 43378 f6f5 g4g5 h6h5 b4d6 h4g5 f4g5 h5g5 d6g3 g5f6
g3h4 f6e6 g8e8 e6d7
7. -1032 380 49798 f6f5 g4g5 h6h5 b4d6 h4g5 f4g5 h5g5 d6g3 g5f6
g3h4 f6e6 g8e8 e6d7
8 -1059 550 86989 f6f5 g4g5 h6h5 b4d6 h4g5 f4g5 f5f4 g2h3 h5g5
d6e6
8. -1059 600 106260 f6f5 g4g5 h6h5 b4d6 h4g5 f4g5 f5f4 g2h3 h5g5
d6e6
9 -1193 1370 349317 f6f5 g4g5 h6h5 b4d6 h4g5 f4g5 f7a7 f3f4 a7a1
g8g7 h5g4 g7h7 a1a2 g2f1
9. -1193 1590 453859 f6f5 g4g5 h6h5 b4d6 h4g5 f4g5 f7a7 f3f4 a7a1
g8g7 h5g4 g7h7 a1a2 g2f1
10 -1404 2310 806621 f6f5 g4g5 h6h5 b4d6 h4g5 f4g5 f7a7 d6d4 a7a3
g2g3 a3f3 g3f3 h5g5 d4f4 g5h5
10. -1404 3790 1489743 f6f5 g4g5 h6h5 b4d6 h4g5 f4g5 f7a7 d6d4 a7a3
g2g3 a3f3 g3f3 h5g5 d4f4 g5h5
11 -1524 6700 2768692 f6f5 g4g5 h6h5 b4d6 h4h1 g2h1 h5h4 d6e6 f7a7
e6e1 h4h3 e1f1 h3g3 f1g1 g3f3 g1a7 f3f4 a7h7
11. -1524 8070 3375551 f6f5 g4g5 h6h5 b4d6 h4h1 g2h1 h5h4 d6e6 f7a7
e6e1 h4h3 e1f1 h3g3 f1g1 g3f3 g1a7 f3f4 a7h7
12 -29967 79920 36226827 f6f5 g4g5 h6h5 b4d6 h4g5 f4g5 h5g5 f3f4 g5g4
g8g6 h7g6 d6g6 g4f4
g8g6 h7g6 d6g6 g4f4
12. -29967 237990 110486115 f6f5 g4g5 h6h5 b4d6 h4g5 f4g5 h5g5 f3f4 g5g4
g8g6 h7g6 d6g6 g4f4
Best regards,
Bas.
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