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Subject: Interesting Position (Tactics and King Safety)

Author: Peter McKenzie

Date: 12:51:46 07/07/01


[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.



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