Aconcagua - UCI chess engine, written in Go
Author: Gabriel (gabtar)
Aconcagua 5.0.0 JA what's new?
Improvements
Evaluation:
Bishop pair bonus
Rook on semi/open files
King on semi/open files
Pawn Shield
King safety based on the number of attackers/weights
Knight and Bishop outposts
Full evaluation parameters tuning
Gradual widening on aspiration window search
Added mate distance pruning
Refactors
Transposition Table refactor. New Bucket system. Resizable hash table.
Individual mobility penalties based on the number of 'free' safe squares.
Fix
Repetition detection
Incremental zobrist hash bug, when unmaking double pawn pushes
Update/fix time control to avoid losing on time on bullet/low time control matches
Improvement against Aconcagua v4.1.0 (fastchess match output):
Results of Aconcagua-v5.0.0 vs Aconcagua-v4.1.0 (8+0.08, NULL, 64MB - NULL, Blitz_Testing_4moves.epd):
Elo: 175.66 +/- 14.87, nElo: 212.41 +/- 15.23
LOS: 100.00 %, DrawRatio: 24.90 %, PairsRatio: 6.91
Games: 2000, Wins: 1266, Losses: 333, Draws: 401, Points: 1466.5 (73.32 %)
Ptnml(0-2): [28, 67, 249, 256, 400], WL/DD Ratio: 5.38
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