Author: Drexel,Michael
Date: 10:30:23 01/08/04
Go up one level in this thread
On January 08, 2004 at 12:01:56, Robert Hyatt wrote: >On January 08, 2004 at 10:02:39, Anthony Cozzie wrote: > >>I've been trying to get some good test positions to rewrite my kingsafety with, >>and playing Gothmog will give you those :) Usually Zappa is slightly better than >>Gothmog. It is stronger tactically (gets more nps and does not do all dubious >>forward pruning) and its mobility is good enough that it plays reasonable moves >>most of the time. Usually Zappa will get its wins in the endgame, but Gothmog >>will get in enough king attacks that the score is close. During one of the test >>games, this position came up (Zappa-white, Gothmog-black): >> >>[D]r2qk2r/pb4pp/3bn3/1P1ppp2/8/BQP5/P2NBPPP/R4RK1 b kq - 4 17 >> >>Where Gothmog evaluated itself as +1, and Zappa thought it was about equal - >>which is of course ludicrous since black has a big advantage. I was less than >>happy with Zappa being blown off the board in 20 moves and not even realizing >>it, so I wrote some code to evaluate control of the board. But I made a mistake >>and tuned it way too high. >> >>What was amazing was the result. Every game went like this: >> >>Zappa pushes pawns >>Gothmog sacrifices a piece for the pawns >>Gothmog thinks its down .5 >>Zappa thinks its up 2 >>Zappa wins back pawns and the game with its extra piece/exchange >> >>Result: Zappa scores 86% - +18-0=7. >> >>Moral of the story: If you want to beat Gothmog, triple your space evaluation. >> >>anthony >> >>caveat: This was done under Arena, with the arena books, which need a bit of >>work. > >Another moral: Don't trade a piece for 2-3 pawns. It will come back to >haunt you more than it doesn't. It depends. In the late endgame it is usually advisable to trade a piece for 3 pawns. [D] 8/7R/6p1/4Kpk1/p1B5/8/8/4r3 w - - 0 63 Crafty was happy with this hopeless position and got a lesson in the game: Crafty 19.06 - Hiarcs 9 8/7R/6p1/4Kpk1/p1B5/8/8/4r3 w - - 0 1 Analysis by Crafty 19.06: 63.Kd6 f4 64.Bd5 a3 65.Rg7 Kf5 66.Rf7+ Kg4 67.Rg7 = (-0.22) Depth: 8 00:00:00 109kN 63.Kd4 f4 64.Bd3 a3 65.Ra7 Ra1 66.Ra5+ Kg4 67.Bxg6 = (0.00) Depth: 8 00:00:00 177kN 63.Kd4 f4 64.Bd3 a3 65.Ra7 Ra1 66.Ra5+ Kg4 67.Bxg6 = (0.00) Depth: 8 00:00:00 178kN 63.Kd4 f4 64.Bd5 a3 65.Rh3 Re3 66.Rxe3 fxe3 67.Kxe3 Kf5 = (-0.01) Depth: 9 00:00:00 312kN 63.Kd4 f4 64.Bd5 a3 65.Rh3 Re3 66.Rxe3 fxe3 67.Kxe3 Kf5 = (-0.01) Depth: 9 00:00:00 379kN 63.Kd4 f4 64.Rg7 f3 65.Rf7 Kg4 66.Bd5 Rf1 67.Be4 g5 = (-0.06) Depth: 10 00:00:01 1025kN 63.Kd4 f4 64.Rg7 f3 65.Rf7 Kg4 66.Bd5 Rf1 67.Be4 g5 = (-0.06) Depth: 10 00:00:02 1181kN 63.Kd4 f4 64.Rg7 f3 65.Bd3 Re6 66.Rf7 Rf6 67.Rxf6 Kxf6 68.Ke3 a3 69.Kxf3 = (-0.11) Depth: 11 00:00:04 2652kN 63.Kd4 f4 64.Rg7 f3 65.Bd3 Re6 66.Rf7 Rf6 67.Rxf6 Kxf6 68.Ke3 a3 69.Kxf3 = (-0.11) Depth: 11 00:00:05 3132kN 63.Kd4 f4 64.Bd5 Kg4 65.Be4 a3 66.Rh2 g5 67.Rg2+ Kh4 68.Rh2+ Kg3 69.Rg2+ Kh4 = (0.00) Depth: 12 00:00:17 9699kN 63.Kd4 f4 64.Bd5 Kg4 65.Be4 a3 66.Rh2 g5 67.Rg2+ Kh4 68.Rh2+ Kg3 69.Rg2+ Kh4 = (0.00) Depth: 12 00:00:18 10240kN 63.Kd4 f4 64.Bd5 Kg4 65.Ra7 g5 66.Be4 Rd1+ 67.Ke5 f3 68.Rf7 Rf1 69.Ra7 Kg3 70.Rxa4 = (-0.20) Depth: 13 00:00:31 17255kN 63.Kd4 f4 64.Bd5 Kg4 65.Ra7 g5 66.Be4 Rd1+ 67.Ke5 f3 68.Rf7 Rf1 69.Ra7 Kg3 70.Rxa4 = (-0.20) Depth: 13 00:00:42 23499kN 63.Kd4 f4 64.Bd5 Kg4 65.Ra7 g5 66.Bc6 Rc1 67.Bd5 f3 68.Rf7 Rd1+ 69.Ke4 Rf1 70.Ke5 = (-0.14) Depth: 14 00:01:28 48402kN [Event ""] [Site ""] [Date "2003.11.27"] [Round "1"] [White "Crafty 19.06"] [Black "Hiarcs 9"] [Result "0-1"] [ECO "B92"] [Annotator "0.56;0.65"] [SetUp "1"] [FEN "8/7R/6p1/4Kpk1/p1B5/8/8/r7 b - - 0 62"] [PlyCount "43"] [TimeControl "300+3"] 62... Re1+ {(f4) -1.59/12 5} 63. Kd4 {-0.15/12 5} f4 {-1.51/11 6} 64. Bd5 { -0.20/11 6} Kg4 {-1.53/11 4} 65. Rh6 {(Rh2) -0.36/11 5} g5 {(Kf5) -1.84/10 3} 66. Be6+ {(Rh2) -0.19/11 5} Kf3 {-1.84/11 6} 67. Rh3+ {(Bd5+) -0.19/11 7} Kf2 { -1.92/11 5} 68. Bf5 {-0.36/11 5} Rg1 {-1.84/10 5} 69. Ke4 {-0.35/11 11} Rg3 { -1.84/11 4} 70. Rh2+ {-0.70/11 5} Kg1 {-1.84/11 4} 71. Ra2 {-0.31/12 5} f3 { (Re3+) -1.97/11 4} 72. Ra1+ {-1.42/11 5} Kg2 {-2.13/12 4} 73. Bd7 { (Ke3) -1.52/12 5} f2 {-2.51/11 4} 74. Bb5 {-1.48/12 5} Rf3 {-2.38/11 5} 75. Bf1+ {-1.64/12 4} Kg3 {-2.59/12 4} 76. Be2 {-1.72/12 4} Rf4+ {(Rf8) -2.75/11 3} 77. Ke3 {(Kd3) -2.11/12 4} g4 {-2.85/11 4} 78. Bf1 {-2.35/12 5} Rf3+ { -3.43/11 4} 79. Ke2 {-2.91/12 5} a3 {-3.63/12 4} 80. Rd1 {(Kd2) -3.40/12 4} Rb3 {-5.44/11 3} 81. Ra1 {-7.73/12 5} Rb2+ {-10.40/11 3} 82. Ke3 {(Kd3) -10.95/13 4 } a2 {-11.05/11 4} 83. Ke4 {-12.54/13 7} Rb1 {-12.86/12 4} 0-1 Michael
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