Author: Roy Eassa
Date: 16:26:00 06/12/02
Go up one level in this thread
On June 12, 2002 at 19:04:54, Roy Eassa wrote: >On June 12, 2002 at 18:37:30, Roy Eassa wrote: > >>On June 12, 2002 at 18:32:43, Roy Eassa wrote: >> >>>On June 12, 2002 at 18:26:05, Roy Eassa wrote: >>> >>>>On June 12, 2002 at 16:46:50, Ferdinand S. Mosca wrote: >>>> >>>>>[D]6R1/1p1r2p1/p3k1Pp/P2pP2K/2pP4/2P5/1P6/8 w - - 0 51 >>>> >>>> >>>>Fritz 7 does not see the rook sacrifice in a short amount of time. Here's what >>>>I think is the main line: >>>> >>>>1.Rxg7 Rxg7 2.Kxh6 Rg8 3.Kh7 Rb8 4.g7 Kf7 5.e6+ Kxe6 6.g8Q+ Rxg8 7.Kxg8 +- >>>> >>>> >>>>Any program must see in advance that the resulting K&P endgame (see diagram >>>>below) is won for White. >>>> >>>>[d] 6K1/1p6/p3k3/P2p4/2pP4/2P5/1P6/8 b - - >>> >>> >>>1.Rxg7! Rxg7 2.Kxh6 Rg8 >>> >>> [2...Re7 3.g7 Kf7 4.Kh7 Re8 5.e6+ transposes] >>> >>>3.Kh7 Rb8 4.g7 Kf7 5.e6+ Kf6 >>> >>> [5...Kxe6 6.g8Q+ Rxg8 7.Kxg8 +-] >>> >>>6.g8Q Rxg8 7.Kxg8 Kxe6 8.Kg7 Ke7 9.Kg6 Ke6 10.Kg5 Ke7 11.Kf5 +- >> >> >>Fritz 7, 1.2 GHz AMD, after 3.5+ minutes: >> >>1.Rf8 Re7 2.Kh4 Rd7 3.Ra8 Re7 4.Kh5 Rc7 >> ± (0.88) Depth: 12/22 00:00:00 267kN >>1.Rf8 Re7 2.Kh4 Rd7 3.Kg4 Re7 4.Kf4 Kd7 5.Kf5 Kc7 6.Rf7 Kd7 7.e6+ Ke8 8.Rxe7+ >> ± (0.75) Depth: 13/24 00:00:00 408kN >>1.Rf8 Re7 2.Kh4 Rd7 3.Kg4 Re7 4.Kh5 >> ± (0.75) Depth: 14/24 00:00:01 657kN >>1.Rf8 Re7 2.Rf1 Kd7 3.b3 cxb3 4.Rb1 Re6 5.Rxb3 Kc7 6.Rb2 b5 7.Rf2 Kc6 8.Rf7 >> ± (0.84) Depth: 15/27 00:00:03 1543kN >>1.Rf8 Re7 2.Rf1 Kd7 3.b3 cxb3 4.Rb1 Re6 5.Rxb3 Kc7 6.Rb2 b6 7.Rf2 Kd7 8.axb6 >> ± (0.94) Depth: 16/27 00:00:04 2194kN >>1.Rf8 Re7 2.Rf1 b6 3.axb6 Rb7 4.Rf7 Rxb6 5.Rxg7 Rxb2 6.Ra7 Rh2+ 7.Kg4 Rg2+ 8.Kf3 >> ± (0.75) Depth: 17/31 00:00:10 5694kN >>1.Re8+! >> ± (0.78) Depth: 17/31 00:00:12 6310kN >>1.Re8+ Re7 2.Rd8 Rd7 3.Rh8 >> ± (0.78) Depth: 18/32 00:00:15 8147kN >>1.Re8+ Re7 2.Rd8 Rd7 3.Rh8 >> ± (0.78) Depth: 19/34 00:00:23 12365kN >>1.Rf8! >> ± (0.81) Depth: 19/34 00:00:26 13957kN >>1.Rf8 Re7 2.Rf1 Rd7 3.Kg4 b6 4.Rf8 bxa5 5.Ra8 Rb7 6.Rxa6+ Ke7 7.Kf5 h5 8.Rxa5 >> ± (1.00) Depth: 20/35 00:00:53 28847kN >>1.Rf8 Re7 2.Rf1 Rd7 3.Kg4 Re7 4.b3 cxb3 5.Rb1 b5 6.axb6 Rb7 7.Rxb3 a5 8.Kh5 >> ± (1.16) Depth: 21/38 00:02:46 89209kN > > >Here's Fritz after 30 minutes, still clueless: > >1.Rf8 Re7 2.Kh4 Rd7 3.Ra8 Re7 4.Kh5 Rc7 > ± (0.88) Depth: 12/22 00:00:00 267kN >1.Rf8 Re7 2.Kh4 Rd7 3.Kg4 Re7 4.Kf4 Kd7 5.Kf5 Kc7 6.Rf7 Kd7 7.e6+ Ke8 8.Rxe7+ > ± (0.75) Depth: 13/24 00:00:00 408kN >1.Rf8 Re7 2.Kh4 Rd7 3.Kg4 Re7 4.Kh5 > ± (0.75) Depth: 14/24 00:00:01 657kN >1.Rf8 Re7 2.Rf1 Kd7 3.b3 cxb3 4.Rb1 Re6 5.Rxb3 Kc7 6.Rb2 b5 7.Rf2 Kc6 8.Rf7 > ± (0.84) Depth: 15/27 00:00:03 1543kN >1.Rf8 Re7 2.Rf1 Kd7 3.b3 cxb3 4.Rb1 Re6 5.Rxb3 Kc7 6.Rb2 b6 7.Rf2 Kd7 8.axb6 > ± (0.94) Depth: 16/27 00:00:04 2194kN >1.Rf8 Re7 2.Rf1 b6 3.axb6 Rb7 4.Rf7 Rxb6 5.Rxg7 Rxb2 6.Ra7 Rh2+ 7.Kg4 Rg2+ 8.Kf3 > ± (0.75) Depth: 17/31 00:00:10 5694kN >1.Re8+! > ± (0.78) Depth: 17/31 00:00:12 6310kN >1.Re8+ Re7 2.Rd8 Rd7 3.Rh8 > ± (0.78) Depth: 18/32 00:00:15 8147kN >1.Re8+ Re7 2.Rd8 Rd7 3.Rh8 > ± (0.78) Depth: 19/34 00:00:23 12365kN >1.Rf8! > ± (0.81) Depth: 19/34 00:00:26 13957kN >1.Rf8 Re7 2.Rf1 Rd7 3.Kg4 b6 4.Rf8 bxa5 5.Ra8 Rb7 6.Rxa6+ Ke7 7.Kf5 h5 8.Rxa5 > ± (1.00) Depth: 20/35 00:00:53 28847kN >1.Rf8 Re7 2.Rf1 Rd7 3.Kg4 Re7 4.b3 cxb3 5.Rb1 b5 6.axb6 Rb7 7.Rxb3 a5 8.Kh5 > ± (1.16) Depth: 21/38 00:02:46 89209kN >1.Rf8 Re7 2.Rf1 Rd7 3.Kg4 Rd8 4.b4 cxb3 5.Rb1 h5+ 6.Kg5 h4 7.Kxh4 Kf5 8.Rxb3 > ± (1.19) Depth: 22/40 00:07:04 239771kN >1.Rf8 Re7 2.Rf1 Rd7 3.Kg4 Ke7 4.b4 cxb3 5.Rb1 b6 6.axb6 Rb7 7.Rxb3 a5 8.Rb2 > ± (1.28) Depth: 23/46 00:17:09 609964kN >1.Rf8 Re7 2.Rf1 Rd7 3.Kg4 Re7 4.Rb1 b6 5.axb6 a5 6.b3 cxb3 7.Rxb3 Rb7 8.Kh5 > ± (1.25) Depth: 24/46 00:25:00 883748kN I played the first 3 ply manually (see diagram below) and STILL Fritz 7 does not see the trouble black is in. After 92 seconds, it fails low (seeing SOME danger) but even after 20 minutes it hasn't added another ply or any resolution: [d]8/1p4r1/p3k1PK/P2pP3/2pP4/2P5/1P6/8 b - - 0 2 2...Rc7 3.g7 Kf7 4.Kh7 Rc8 5.e6+ Kxe6 6.g8Q+ Rxg8 7.Kxg8 µ (-0.88) Depth: 13/21 00:00:00 208kN 2...Rc7-- ³ (-0.59) Depth: 14/21 00:00:00 246kN 2...Rc7 3.g7 Kf7 4.Kh7 Rc8 5.e6+ Kxe6 6.g8Q+ Rxg8 7.Kxg8 Ke7 ³ (-0.50) Depth: 14/21 00:00:00 287kN 2...Rc7 3.g7 Kf7 4.Kh7 Rc8 5.e6+ Kf6 6.g8Q Rxg8 7.Kxg8 Kxe6 8.Kf8 Kf6 9.Ke8 Ke6 ³ (-0.56) Depth: 15/22 00:00:00 457kN 2...Rc7 3.g7 Kf7 4.Kh7 Rc8 5.e6+ Kxe6 6.g8Q+ Rxg8 7.Kxg8 Ke7 8.Kg7 Ke6 9.Kg6 Ke7 ³ (-0.38) Depth: 16/25 00:00:01 733kN 2...Rc7 3.g7 Kf7 4.Kh7 Rc8 5.e6+ Kxe6 6.g8Q+ Rxg8 7.Kxg8 Ke7 8.Kg7 Ke6 9.Kg6 Ke7 ³ (-0.38) Depth: 17/26 00:00:02 1170kN 2...Rc7 3.g7 Kf7 4.Kh7 Rc8 5.e6+ Kxe6 6.g8Q+ Rxg8 7.Kxg8 Ke7 8.Kg7 Ke8 9.Kf6 Kd7 = (-0.25) Depth: 18/27 00:00:03 2030kN 2...Rc7-- = (0.03) Depth: 19/29 00:00:05 3355kN 2...Rc7 3.g7 Kf7 4.Kh7 Rc8 5.e6+ Kxe6 6.g8Q+ Rxg8 7.Kxg8 Ke7 8.Kg7 Ke6 9.Kg8 Ke7 = (0.00) Depth: 19/33 00:00:08 5279kN 2...Rc7 3.g7 Kf7 4.Kh7 Rc8 5.e6+ Kxe6 6.g8Q+ Rxg8 7.Kxg8 Ke7 8.Kg7 Ke6 9.Kg8 Ke7 = (0.00) Depth: 20/31 00:00:11 7472kN 2...Rc7 3.g7 Kf7 4.Kh7 Rc8 5.e6+ Kxe6 6.g8Q+ Rxg8 7.Kxg8 Ke7 8.Kg7 Ke6 9.Kg8 Ke7 = (0.00) Depth: 21/33 00:00:17 11233kN 2...Rc7 3.g7 Kf7 4.Kh7 Rc8 5.e6+ Kxe6 6.g8Q+ Rxg8 7.Kxg8 Ke7 8.Kg7 Ke6 9.Kg8 Ke7 = (0.00) Depth: 22/36 00:00:28 18152kN 2...Rc7 3.g7 Kf7 4.Kh7 Rc8 5.e6+ Kxe6 6.g8Q+ Rxg8 7.Kxg8 Ke7 8.Kg7 = (0.00) Depth: 23/39 00:00:53 33974kN 2...Rc7-- ² (0.44) Depth: 24/42 00:01:32 60006kN
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