Author: Uri Blass
Date: 03:03:10 05/19/03
Go up one level in this thread
On May 19, 2003 at 04:49:39, Marc van Hal wrote: >On May 18, 2003 at 11:16:48, Jon Dart wrote: > >>See comments inline. >> >>>On May 18, 2003 at 09:05:56, Uri Blass wrote: >>> >> >>>>arasan3.17 >>>> >>>>[D]8/8/5PbP/4k1P1/8/4B1K1/8/5r2 b - - 0 1 >>>>Bm: Rf5 >>>> >>>>The problem is that it seems that Ke4 is also winning >>>> >> >>I agree Ke4 is an alternate solution. I will add it as an alternative "best >>move". >> >> >>>Another mistake: >>> >>>Id: arasan3.63 >>>Fen: r4rk1/1pp3q1/2np3p/p2Npb1B/2PbN1p1/3P2P1/PP4PP/R2Q1R1K w - - 0 1 >>>Bm: Nxc7 >> >>Crafty fails high with Nef6+ at ply 15 after 14 minutes on my Athlon XP2500+, >>but then changes to Ndf6+: >> >> 13 57.56 0.06 1. Bxg4 Bxe4 2. dxe4 Rxf1+ 3. Qxf1 >> Rf8 4. Be6+ Kh8 5. Bf5 Nd8 6. Rb1 c6 >> 7. Nc3 Be3 8. Re1 Qg5 >> 13 3:26 0.11 1. Qb3 Bxe4 2. dxe4 b6 3. c5 Kh7 4. >> cxb6 cxb6 5. Rf5 Ne7 6. Nxe7 Qxe7 7. >> Raf1 Rxf5 8. exf5 a4 >> 13 4:01 0.38 1. Rxf5 Rxf5 2. Nxc7 Rxh5 3. Nxa8 Qg6 >> 4. Qxg4 Qxg4 5. Nf6+ Kg7 6. Nxg4 Nb4 >> 7. Rd1 Bxb2 >> 13 4:22 ++ 1. Nxc7!! >> 13 5:11 0.72 1. Nxc7 Bxe4 2. Nxa8 Bf5 3. Rxf5 Rxf5 >> 4. Qxg4 Qxg4 5. Bxg4 Rf2 6. Nc7 Bxb2 >> 7. Kg1 >> 13-> 5:29 0.72 1. Nxc7 Bxe4 2. Nxa8 Bf5 3. Rxf5 Rxf5 >> 4. Qxg4 Qxg4 5. Bxg4 Rf2 6. Nc7 Bxb2 >> 7. Kg1 >> 14 6:01 0.65 1. Nxc7 Bxe4 2. Nxa8 Bf5 3. Rxf5 Rxf5 >> 4. Qxg4 Qxg4 5. Bxg4 Rf2 6. Nc7 Kh7 >> 7. Nd5 Bxb2 >> 14-> 8:12 0.65 1. Nxc7 Bxe4 2. Nxa8 Bf5 3. Rxf5 Rxf5 >> 4. Qxg4 Qxg4 5. Bxg4 Rf2 6. Nc7 Kh7 >> 7. Nd5 Bxb2 >> 15 9:36 0.76 1. Nxc7 Bxe4 2. Nxa8 Bf5 3. Rxf5 Rxf5 >> 4. Qxg4 Qxg4 5. Bxg4 Rf2 6. Nc7 Bxb2 >> 7. Kg1 Bd4 8. Nd5 >> 15 14:12 ++ 1. Nef6+!! >> 15 16:57 3.11 1. Nef6+ Kh8 2. Rxf5 e4 3. Qf1 Bxb2 >> 4. Rb1 Bxf6 5. Rxf6 Rxf6 6. Qxf6 Qxf6 >> 7. Nxf6 exd3 8. Rxb7 Rf8 9. Rxc7 Rxf6 >> 10. Rxc6 >> 15 17:20 3.14 1. Ndf6+ Rxf6 2. Nxf6+ Qxf6 3. Bxg4 >> Ne7 4. Bxf5 Nxf5 5. Qg4+ Qg7 6. Qxf5 >> Rf8 7. Qe6+ Kh7 <HT> >> >>It looks like Ndf6+ and Nef6+ are both winning here and should be listed as >>alternate solutions (instead of Nxc7). >> >>--Jon > >Now it starts looking like Euwe Kramer books gues the move >in which you have to choose one move or plan while there are alternatives or >even better moves or plans available. >So you can end up with a zero or low score when selecting the best moves. >he he >Marc Yes I start to look at positions that movei could not solve in 10 minutes and I find that in at least one of them the solution is simply not convincing. Movei could not see the solution in arasan3.50 but movei is not alone and shredder also failed to see the solution after 10 minutes on A1000. I do not think that the problem is null move pruning because yace also fails to see a convincing score for Kh4(0.54/18 at the time of writing this post). Nr: 43 Id: arasan3.50 [D]8/p5r1/1pR1pk1p/1P1p1p2/5PP1/6KP/P3P3/8 w - - 0 1 Analysis by Shredder 7.04: 1.Kh4 Rh7 2.a4 fxg4 3.hxg4 Rf7 4.Kg3 a6 5.Rxb6 h5 ± (1.07) Depth: 17/35 00:02:19 30827kN 1.Kh4 fxg4 2.hxg4 h5 3.gxh5 Kf5 4.e3 Rg1 5.Rc7 Rh1+ 6.Kg3 Rxh5 7.Rxa7 Ke4 8.Rb7 Kxe3 9.Rxb6 Rh6 10.Ra6 ± (0.82) Depth: 18/35 00:02:52 38146kN 1.Kh4 fxg4 2.hxg4 h5 3.gxh5 Kf5 4.e3 Rg1 5.Rc7 Rh1+ 6.Kg3 Rxh5 7.Rxa7 Ke4 8.Re7 Rh6 9.Kg4 Rg6+ ± (0.75) Depth: 18/35 00:03:07 41455kN 1.Rc8 Rd7 2.Kf2 a6 3.gxf5 Kxf5 4.Rf8+ Kg6 5.Rb8 axb5 6.Rxb6 Kf5 7.Kf3 Ra7 8.Rxb5 e5 9.Rxd5 Rxa2 ± (0.76) Depth: 18/40 00:05:59 79299kN 1.Rc8 Rd7 2.Kf2 d4 3.Rh8 Kg6 4.Re8 Kf6 5.gxf5 exf5 6.e4 fxe4 7.Rh8 ± (0.76) Depth: 18/40 00:06:38 87785kN 1.a4 fxg4 2.hxg4 h5 3.g5+ Kf5 4.Rc8 h4+ 5.Kf3 Kg6 6.Rf8 Rh7 ± (0.77) Depth: 18/40 00:07:08 93815kN 1.a4 Rd7 2.gxf5 Kxf5 3.Rxb6 axb6 4.h4 ± (0.77) Depth: 18/40 00:07:29 98084kN (Blass, Tel-Aviv 19.05.2003) Note that I did not look at most of the solutions so I suspect that there are some more wrong positions(it is also possible that some positions that movei got right are wrong). Uri
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