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Thursday, January 19, 2017

Chess engine: Roc (derived from Gull 3)

Roc is a new chess engine, derived from Gull 3

Roc has the following refinements: 
-- based on a C++ port of Gull 3, eliminating goto tatements. 
-- fixes some minor bugs found in the Gull source 
-- unit of valuation changed from 1 cp to 1/4 cp 
-- extends Gull's two phases (opening, endgame) to 3 phases (opening, middle, endgame) plus a phase-like contribution for closed-ness 
-- supports a contempt setting 
-- adds king tropism to evaluation 

In tests so far, Roc appears to be slightly stronger (5 +/- 5 Elo) than Gull 3. 

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