Author: José Carlos
Date: 01:18:59 09/08/01
Go up one level in this thread
On September 07, 2001 at 22:15:32, Jim Monaghan wrote: >Hi Peter, > >Here is a difficult R+P endgame for programs illustrating the power of connected >passers vs scattered ones. > >[D] 8/5k2/R5pp/3pP2P/p2r1PK1/8/8/8 b - - 0 > >Karpov - Deep Thought, 1990. > >Deep Thought played the greedy 1...gxh5+?? and Karpov quickly showed the power >of connected passed pawns in this type of ending: > >1... gxh5+ 2. Kf5! (Not 2. Kxh5? Rxf4) Kg7 3. Ra7+ Kf8 4. e6 Re4 5. Rd7 Rc4 6. >Rxd5 h4 7. Rd3 >Ke7 8. Rd7+ Kf8 9. Rh7 h5 10. Ke5 h3 11. f5 Kg8 12. Rxh5 a3 13. Rxh3 a2 14. Ra3 >Rc5+ 15. Kf6 (1-0) > >Absolutely essential was 1...g5! to break up White's pawns at all costs, viz. > >1... g5 2. Rxh6 Rxf4+ (Not 2...gxf4? 3. Kf5!) 3. Kxg5 Rf1 should hold. > >(Source: Practical Endgame Play, N. McDonald) > >I tried this on a few engines and they seem very confused. I suppose it would >take a very long think on an engine's part to work it all out, if at all. >Rather than solving it thematically (intuiatively?) as a human would. Knowledge >vs Brute Force. It's possible that positions like this would show more of an >engine's shortcomings as opposed to tactical tricks in most endgame studies. > >Cheers, >Jim Averno's score slowly drops for gxh5, but takes too long to be useful :( Averno v0.33 alfa (c) 1999-2001 Jose Carlos Martinez Galan go Tiempo esperado: 142857142.842857 Prof Eval Tiempo Nodos PV ---- ---- ------ --------- ------ 1 1.99 0.00 40 g6h5 1 1.99 0.00 57--g6h5 2 2.01 0.00 348 g6h5 g4h5 2 2.01 0.00 456--g6h5 g4h5 3 1.98 0.00 1439 g6h5 g4f3 f7g7 3 1.98 0.01 1633--g6h5 g4f3 f7g7 4 2.00 0.01 3890 g6h5 g4h5 d4f4 h5h6 4 2.00 0.02 4180--g6h5 g4h5 d4f4 h5h6 5 2.00 0.04 11061 g6h5 g4g3 h5h4 h5h6 f4e4 5 2.00 0.04 11700--g6h5 g4g3 h5h4 - 6 1.96 0.10 29607 g6h5 g4f3 f7g7 a6a7 g7h8 g3h4 6 1.96 0.11 31934--g6h5 g4f3 f7g7 a6a7 g7h8 - 7 1.34 0.19 60257 g6h5 g4f3 f7g7 a6a7 g7f8 a7a6 h5h4 7 1.34 0.23 73890--g6h5 g4f3 f7g7 a6a7 g7f8 a7a6 h5h4 8 1.29 0.35 108900 g6h5 g4f3 f7g7 a6a7 g7f8 a7a6 d4b4 a6h6 8 1.29 0.41 127882--g6h5 g4f3 f7g7 a6a7 g7f8 a7a6 d4b4 a6h6 9 0.69 1.17 400219 g6h5 g4f5 f7g7 a6a7 g7f8 a7a6 a4a3 a6h6 a3a2 9 0.69 1.38 473663--g6h5 g4f5 f7g7 a6a7 g7f8 a7a6 a4a3 a6h6 a3a2 10 0.42 1.89 665752 g6h5 g4f5 f7g7 a6a7 g7f8 a7a6 d4b4 a6h6 a4a3 h6h5 10 0.42 2.39 835406--g6h5 g4f5 f7g7 a6a7 g7f8 a7a6 d4b4 a6h6 a4a3 h6h5 11 0.42 2.91 1033303 g6h5 g4f5 f7g7 a6a7 g7f8 a7a8 f8e7 a8a6 d4b4 a6h6 a4a3 11 0.42 4.14 1459918--g6h5 g4f5 f7g7 a6a7 g7f8 a7a8 f8e7 a8a6 d4b4 a6h6 a4a3 12 0.40 5.31 1894699 g6h5 g4f5 f7g7 a6a7 g7f8 a7a8 f8e7 a8a6 e7d7 a6d6 d7c7 h6h5 12 0.40 7.57 2696728--g6h5 g4f5 f7g7 a6a7 g7f8 a7a8 f8e7 a8a6 e7d7 a6d6 d7c7 - 13 0.40 19.66 6920181 g6h5 g4f5 f7g7 a6a7 g7f8 a7a6 d4e4 a6a8 f8f7 a8a6 h5h4 a6h6 a3a2 13 0.40 33.41 11672057--g6h5 g4f5 f7g7 a6a7 g7f8 a7a6 d4e4 a6a8 f8f7 a8a6 h5h4 a6h6 - 14 0.39 44.52 15747262 g6h5 g4f5 f7e7 a6h6 g7f8 a7h7 h5h4 h7h6 a4a3 h6h4 a3a2 h6a6 - 14 0.39 52.25 18568593--g6h5 g4f5 f7e7 a6h6 - 15 0.32 87.41 31150464 g6h5 g4f5 f7g7 a6a7 g7f8 a7a8 f8e7 a8a6 d4b4 a6e6 e7d7 e6h6 a4a3 h6a6 b4b3 15 0.32 124.33 44114351--g6h5 g4f5 f7g7 a6a7 g7f8 a7a8 f8e7 a8a6 d4b4 a6e6 e7d7 e6h6 a4a3 h6a6 b4b3 16 0.19 229.29 80514331 g6h5 g4f5 f7e7 a6h6 a4a3 h6a6 d4d3 f5g5 d3f3 f4f5 e7e6 a7a6 e6f7 a6a7 f7e8 g5h5 16 0.19 487.04 165163505--g6h5 g4f5 f7e7 a6h6 a4a3 h6a6 d4d3 f5g5 d3f3 f4f5 - 17 0.03 672.95 230391469 g6h5 g4f5 f7g7 a6a7 g7f8 a7a6 d4e4 a6h6 a4a3 h6h8 f8e7 h8h5 e4a4 h5h7 e7e8 h7h8 a3a2 17 0.03 1460.66 503441659--g6h5 g4f5 f7g7 a6a7 g7f8 a7a6 d4e4 a6h6 a4a3 h6h8 f8e7 h8h5 e4a4 h5h7 e7e8 h7h8 - 18 0.01 2350.10 822505839 g6h5 g4f5 f7g7 a6g6 g7h7 g6d6 h7g8 d6g6 h7g7 d6d8 d4e4 d8d5 e4e1 d5d7 g7h8 d7d8 h8h7 d8d7 18 0.01 3392.20 1187200804--g6h5 g4f5 f7g7 a6g6 g7h7 g6d6 h7g8 d6g6 - ;Mi jugada (26) es: g6h5; Tiempo restante: 9999996368.07 Totales: Visitados: 1269200009 Nulos: 240068934 Cortes Nulos: 136680998 Hash exactos: 6775 UBounds: 22808585 LBounds: 182677398 Fallos: 1699770083 Hash grabaciones: 395132647 (100%) No grabaciones: 366523929 Extensiones: Jaque: 93151967 Recaptura: 5557970 Null: 342299 Podas Futility: 28388225 Cortes Beta: 314886272 Cortes Beta Primera: 278831957 (89%) Por segundo: Visitados: 349551
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