Author: Rafael Andrist
Date: 13:30:36 09/14/01
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On September 14, 2001 at 10:31:49, Robert Hyatt wrote: >On September 13, 2001 at 02:09:45, Dave Gomboc wrote: > >> >>The opposition is a special case of coordinate squares. >> >>The theory of coordinate squares have existed since long before 1984. >> >>Dave > > >Didn't mean to imply otherwise. Bratko was simply a pawn-ending expert that >worked with Danny. He explained the idea behind "coordinate squares" to me >while we were discussing specific "anti-levy" ideas after we had lost the >first two games in classic anti-computer style. We somehow got onto some >obscure endgame position in the discussion and he explained how this worked. >We then drifted to the endgame (K+P) solver Newborn had done, and the we >got to fine 70 and chess 4.x's 23 minute solution (newborn predicted his program >would take years to solve that one) and as Bratko showed how coordinate squares >were important there, I decided to play with it after the Levy match ended. > >I always assumed the idea had been around for not just years, but hundreds of >years. Just like opposition, distant opposition, etc. The idea of co-ordinated squares came up with a publication from Lasker 1901. BTW, the "Fine #70" is composed by him. The theory was developped mainly after the 2nd World War. I recommend you Averbakhs book about pawn endings. Even if you are not interested in implementing them in Crafty, there is lot of other useful stuff in this book. Rafael B. Andrist
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