Anodos 1.3.0 - new version chess engine

Anodos - UCI chess engine

github:https://github.com/tomcant/anodos/releases

Author: Tom Cant (London, United Kingdom)

Anodos 1.3.0 what's new?

Additions

• Static exchange evaluation (SEE): evaluate capture sequences to order good captures before bad ones in move ordering.
• Delta pruning: prune nodes in quiescence search where the material gain cannot possibly raise alpha.
• Skip bad captures in quiescence: use SEE to avoid searching losing captures in quiescence.
• Late move pruning: skip late moves entirely at low depths where they are unlikely to improve the position.
• Internal iterative reduction: reduce depth when no TT move is available since these positions are less likely to be interesting.
• Insufficient material detection: detect draws when neither side has enough material to deliver checkmate (this is not strict FIDE draw rules, positions like KNN vs K are treated as draws since they require "helpmate", which the engine discards the possibility of).

Enhancements

• More aggressive late move reductions: it was found through trial/error that reducing depth further for quiet/late moves brings a small but worthwhile increase in strength.

SPRT result vs 1.2.0

Results of 1.3.0 vs 1.2.0 (10+0.1, NULL, 64MB, 8moves_v3.pgn):
Elo: 186.55 +/- 35.26, nElo: 298.14 +/- 46.55
LOS: 100.00 %, DrawRatio: 19.63 %, PairsRatio: 16.20
Games: 214, Wins: 119, Losses: 14, Draws: 81, Points: 159.5 (74.53 %)
Ptnml(0-2): [0, 5, 21, 52, 29], WL/DD Ratio: 0.75
LLR: 2.97 (100.8%) (-2.94, 2.94) [0.00, 10.00]

Anodos 1.1.0 vs other engines:

Bytechess 1.3.0	3.5/4	+3	4 games
Chessnut 1.0	2.5/4	+1	4 games
Kreveta 2.2.2	2/4	+0	4 games
Prune 3.1.0	0/4	-4	4 games
Gyatso 1.1.0	0/4	-4	4 games
Critter 1.6a	0/4	-4	4 games
Lozza 10	0/4	-4	4 games
Chess-3 3.0	0/4	-4	4 games
Rusty-rival 1.0.20 rc5	2/2	+2	2 games
Gc-engine 1.2 JA	2/2	+2	2 games
Annie 1.2	2/2	+2	2 games
RuthIron18.9.6	2/2	+2	2 games
Byte 2.0	2/2	+2	2 games
Rusty-rival 1.0.21 rc6	1.5/2	+1	2 games
Rusty-rival 1.0.23	1/2	+0	2 games
Raphael 2.2 JA	0/2	-2	2 games
Grail 1.0.4	0/2	-2	2 games
Monty 20260111	0/2	-2	2 games
Caligula 3.1 JA	0/2	-2	2 games
Stockfish dev-20260101	0/2	-2	2 games
Yakka 1.5	0/2	-2	2 games

Anodos 1.3.0 download

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