Author: Miguel A. Ballicora
Date: 09:30:31 09/25/01
Go up one level in this thread
On September 25, 2001 at 08:34:02, Uri Blass wrote: >On September 25, 2001 at 00:44:25, Jouni Uski wrote: > >>[D]r4rk1/ppq3pp/2p1Pn2/4p1Q1/8/2N5/PP4PP/2KR1R2 w - - bm Rxf6 >> >>This is definitely correct if very difficult! In my PC only Tiger solves under >>1 hour. >> >>Jouni > >Deep Fritz after some learning can also solve it >Deep Fritz believes that the position is easy after seeing the solution > >New position >[D]r4rk1/ppq3pp/2p1Pn2/4p1Q1/8/2N5/PP4PP/2KR1R2 w - - 0 1 > >Analysis by Deep Fritz: > >1.Qxf6-- > -+ (-1.41) Depth: 1/4 00:00:00 >1.Qxf6-- Rxf6 > -+ (-6.25) Depth: 1/5 00:00:00 >1.Rxf6! > -+ (-4.62) Depth: 1/5 00:00:00 >1.Rxf6! Rxf6 > -+ (-2.28) Depth: 1/5 00:00:00 >1.Rde1! > µ (-1.25) Depth: 1/5 00:00:00 >1.Rde1! e4 > = (-0.22) Depth: 1/5 00:00:00 >1.Rde1 e4 2.Nxe4 > = (-0.06) Depth: 2/9 00:00:00 >1.Rfe1! > = (-0.03) Depth: 2/9 00:00:00 >1.Rfe1! Rad8 2.Rxd8 Rxd8 3.Rxe5 h6 4.Qf4 Nd5 5.Nxd5 cxd5+ 6.Kd1 > = (0.00) Depth: 2/11 00:00:00 >1.Rfe1 Rad8 2.Rxd8 Rxd8 3.Rxe5 h6 4.Qf4 Nd5 5.Nxd5 cxd5+ 6.Kd1 > = (0.00) Depth: 3/11 00:00:00 >1.Rfe1 Rad8 2.Rxd8 Rxd8 3.Rxe5 h6 4.Qf4 Nd5 5.Nxd5 cxd5+ 6.Kd1 > = (0.00) Depth: 4/11 00:00:00 >1.Rfe1 Rad8 2.Rxd8 Rxd8 3.Rxe5 h6 4.Qf4 Nd5 5.Nxd5 cxd5+ 6.Kd1 > = (0.00) Depth: 5/11 00:00:00 2kN >1.Rfe1 Rad8 2.Rxd8 Rxd8 3.Rxe5 h6 4.Qf4 Nd5 5.Nxd5 cxd5+ 6.Kd1 > = (0.00) Depth: 6/11 00:00:00 4kN >1.Rfe1 Rad8 2.Rxd8 Rxd8 3.Rxe5 h6 4.Qf4 Nd5 5.Nxd5 cxd5+ 6.Kd1 > = (0.00) Depth: 7/11 00:00:00 19kN >1.Rfe1 Rad8 2.Rxd8 Rxd8 3.Rxe5 h6 4.Qf4 Nd5 5.Nxd5 cxd5+ 6.Kd1 > = (0.00) Depth: 8/11 00:00:00 36kN >1.Rfe1 Rad8 2.Rxd8 Rxd8 3.Rxe5 h6 4.Qf4 Nd5 5.Nxd5 cxd5+ 6.Kd1 > = (0.00) Depth: 9/16 00:00:00 119kN >1.Rxf6! > = (0.03) Depth: 9/22 00:00:00 293kN >1.Rxf6! Rxf6 2.Rd7 Rg6 > ² (0.53) Depth: 9/23 00:00:00 297kN >1.Rxf6 Rxf6 2.Rd7 Rg6 3.Qf5 Qc8 4.Qf7+ Kh8 5.e7 > ² (0.53) Depth: 10/18 00:00:00 332kN >1.Rxf6 Rxf6 2.Rd7 Rg6 3.Qf5 Qc8 4.Qf7+ Kh8 5.e7 > ² (0.53) Depth: 11/21 00:00:00 604kN >1.Rxf6 Rxf6 2.Rd7 Rg6 3.Qf5 Qc8 4.Qf7+ Kh8 5.e7 > ² (0.53) Depth: 12/26 00:00:01 1154kN >1.Rxf6 Rxf6 2.Rd7 Rg6 3.Qf5 Qc8 4.Qf7+ Kh8 5.e7 > ² (0.53) Depth: 13/23 00:00:03 2681kN >1.Rxf6 Rxf6 2.Rd7 Rg6 3.Qf5 Qc8 4.Qf7+ Kh8 5.e7 > ² (0.53) Depth: 14/27 00:00:08 5494kN >1.Rxf6! > ± (0.84) Depth: 15/37 00:00:20 13329kN Looks like a great position. Rxf6 is now or never and the advantage evaporates. Fritz is not giving a full PV there, I think. White threats Rd8+ Qg8 seems to be the only move... isn't it? 6. Qxg8+ Rxg8 (otherwise Rd8+) 7. Rd8? Re6! (and black wins) So there must be something else. Sounds like white can use some time and 7. Ne4 creates a lot of problems. I fail to see how to stop Nd6 and promotion. If this is true, programs might fail to see all this because it is deep with quiet moves at the end (and null move may prune all this?). I believe this is a great position, difficult for a program, but great. Regards, Miguel
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