Author: Robert Hyatt
Date: 15:36:04 07/07/01
Go up one level in this thread
On July 07, 2001 at 15:51:46, Peter McKenzie wrote:
>[D]2r2rk1/1p2bppp/1qn1p3/p2pPn2/1P1P1P1P/P2Q1NP1/1B2N3/2R1K2R w K -
>
>This position was reached in a game on ICC, with LambChop black and a human
>white. LambChop just played a5, which allows the opponent to attack on the king
>side with g4 Nh6 Ng5 g6 h5 and white is winning I think.
>
>I was a little surprised that it takes Chop 11ply to play g4 (initially it
>preferred b5), and even after a 13ply search the score is still slightly
>negative (0.2 in black's favour).
>
>So I'm wondering how other programs do here?
>
>I think that black has some chances to muddy the waters with sacrifices on b4 at
>various points. While I don't think these are any good, they do have some merit
>and could push the horizon out a bit.
>
>Any suggestions of what sort of evaluation terms or extensions might help here
>would be welcome :-)
>
>cheers,
>Peter
>
>p.s. Now I see that there is another possible defence: g4 axb4 gxf5 bxa3, not
>sure if this works but it's interesting. The position after g4:
>
>[D]2r2rk1/1p2bppp/1qn1p3/p2pPn2/1P1P1PPP/P2Q1N2/1B2N3/2R1K2R b K -
>
>In this position, Chop needs 12ply to switch to axb4, score is +0.44. I
>wouldn't treat that score as gospel, but I think axb4 is a much better try than
>Nh6.
g4 is about all I get. Crafty finds this at the 5 second mark on my PIII/750
notebook... depth=8. Scores don't look overwhelming however:
7-> 1.08 -0.88 1. b5 Na7 2. g4 Nh6 3. g5 Ng4 4. Nc3
8 1.80 -1.12 1. b5 Na7 2. Rxc8 Rxc8 3. g4 Nh6 4.
g5 Ng4 5. Nc3 <HT>
8 3.24 -1.06 1. g4 Nh6 2. g5 Nf5 3. b5 Na7 4. Rxc8
Rxc8 5. Nc3 <HT>
(2) 8-> 3.75 -1.06 1. g4 Nh6 2. g5 Nf5 3. b5 Na7 4. Rxc8
Rxc8 5. Nc3 <HT>
9 6.69 -1.03 1. g4 Nh6 2. Ng5 g6 3. h5 Bxg5 4. fxg5
Nxg4 5. Qh3 gxh5 6. Qxh5
9-> 7.97 -1.03 1. g4 Nh6 2. Ng5 g6 3. h5 Bxg5 4. fxg5
Nxg4 5. Qh3 gxh5 6. Qxh5
10 13.96 ++ 1. g4!!
10 21.20 -0.46 1. g4 axb4 2. gxf5 bxa3 3. Bc3 Nb4
4. Bxb4 Rxc1+ 5. Nxc1 Qxb4+ 6. Qd2
exf5 7. Qxb4 Bxb4+
10-> 22.51 -0.46 1. g4 axb4 2. gxf5 bxa3 3. Bc3 Nb4
4. Bxb4 Rxc1+ 5. Nxc1 Qxb4+ 6. Qd2
exf5 7. Qxb4 Bxb4+
11 39.31 -0.61 1. g4 axb4 2. gxf5 bxa3 3. Bc3 Nb4
4. Bxb4 Rxc1+ 5. Nxc1 Qxb4+ 6. Qd2
Rc8 7. Qxb4 Bxb4+ 8. Kf2 exf5
11-> 43.32 -0.61 1. g4 axb4 2. gxf5 bxa3 3. Bc3 Nb4
4. Bxb4 Rxc1+ 5. Nxc1 Qxb4+ 6. Qd2
Rc8 7. Qxb4 Bxb4+ 8. Kf2 exf5
12 1:24 -0.75 1. g4 axb4 2. gxf5 bxa3 3. Bc3 Nb4
4. Bxb4 Rxc1+ 5. Nxc1 Qxb4+ 6. Nd2
Rc8 7. Na2 Qb2 8. f6 gxf6
12-> 1:38 -0.75 1. g4 axb4 2. gxf5 bxa3 3. Bc3 Nb4
4. Bxb4 Rxc1+ 5. Nxc1 Qxb4+ 6. Nd2
Rc8 7. Na2 Qb2 8. f6 gxf6
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