Author: Robert Hyatt
Date: 09:01:56 01/08/04
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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.
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