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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