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============================== My email: jotes@go2.pl



Aconcagua 5.1.0 - new version chess engine

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Aconcagua - UCI chess engine, written in Go
Author: Gabriel (gabtar)

Aconcagua 5.1.0 JA what's new?

Improvements

  • Early exit on Static Exchange Evaluation
  • Counter Move
  • Add simple promotions in quiescence evaluation
  • More aggresive reductions for late move reductions in certain conditions
  • Added seldepth metric to info string
  • Add transposition table probe on quiescence search

Refactors

  • Legality check in move generator to include non captures
  • Precalculated king attacks/ pawn push tables
  • Pawn hash table w/ bucket system

Fix

  • Issue with pv line that continues after threefold repetitions(there is still a minimal bug with this, i will further investigate to completely mitigate it on next release)
  • Error with Killers move table indexing on high depth that crashes the engine

Improvement against Aconcagua v5.0.0 (fastchess match output):

Results of Aconcagua v5.1.0 vs Aconcagua-v5.0.0 (8+0.08, NULL, 64MB, UHO_Lichess_4852_v1.epd):
Elo: 118.14 +/- 13.16, nElo: 147.51 +/- 15.23
LOS: 100.00 %, DrawRatio: 30.80 %, PairsRatio: 3.98
Games: 2000, Wins: 1075, Losses: 420, Draws: 505, Points: 1327.5 (66.38 %)
Ptnml(0-2): [34, 105, 308, 278, 275], WL/DD Ratio: 4.05

Included Binaries

Available to download the compiled binaries for Linux, Windows and Mac OS built using the GOAMD64(v1, v2, v3, v4) profile flag for specific x86_64 microarchitectures.
If you are not sure which one to pick, use the one with 'base' suffix, that uses instructions that all x86_64 cpus support.





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