Author: Dann Corbit
Date: 16:51:42 08/08/02
Go up one level in this thread
On August 07, 2002 at 16:30:27, Bas Hamstra wrote: >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 Chess Tiger analysis (does not find it either): [D]3R4/5r1p/5ppk/8/1Q3PPq/5P2/6K1/8 w - - ce 568; acd 17; acs 600; pv Rd1 Kg7 Rh1 Qxh1+ Kxh1 Rc7 Qa5 Rf7 Kg2 f5 Qe5+ Kg8 g5 Rb7 Qd5+ Rf7 Kg3 Kg7 Qe5+;|Rd8d1 After the key move, it all becomes much clearer: [D]6R1/5r1p/5ppk/8/1Q3PPq/5P2/6K1/8 b - - ce -1648; acd 13; acs 1; pv f5 g5+ Kh5 Qd6 Qxg5+ fxg5 Kxg5 Qd8+ Rf6 f4+ Kxf4 Qc7+ Rd6 Qxd6+ Kg5 Qh2 h5 Qg3+;|f5 After the first guess, nothing wonderful happens: [D]8/5r1p/5ppk/8/1Q3PPq/5P2/6K1/3R4 b - - ce -576; acd 16; acs 1; pv Kg7 Rh1 Qxh1+ Kxh1 Rc7 Qe4 Rf7 f5 gxf5 Qxf5 Re7 Kg2 Re5 Qd7+ Kg6 f4 Re3 Qf5+ Kg7;|Kh6g7
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