Reckless 0.8.0 dev-2fe JA - new version chess engine

 

Reckless, a Rust-based UCI chess engine.

Author: Arseniy Surkov   Rating Chess Engines Diary CEDR=3360

v.0.7.0:

Release Notes

The NNUE hidden layer size has been increased from 128 to 384, further improved by adding 4 output buckets (#56) and material scaling (#62). The final architecture is (768 -> 384)x2 -> 1x4.

Changelog

Time management

Time adjustment based on score stability (#50)

Time adjustment based on best move stability (#42)

Performance optimizations

Allocate a quiet move list on the stack (#51)

Implement operation fusion for NNUE (#58)

Optimize accumulator handling (#59)

Various search improvements

History tuning (#39)

Null Move Pruning tuning (#54)

Check extensions before the move loop (#40)

Disable quiescence search pruning for recaptures (#35)

Treat non-winning captures as unfavorable in quiescence search (#57)

Static Exchange Evaluation (#36, #37, #44, and #61)

Fully fractional LMR (#60)

Features

Mate Distance Pruning (#43)

Multi-threaded transposition table initialization (#63)

Full Changelog: v0.6.0...v0.7.0

Self-Play Benchmark Against v0.6.0

STC 8.0+0.08s

Elo   | 172.12 +- 11.31 (95%)

Conf  | 8.0+0.08s Threads=1 Hash=32MB

Games | N: 2000 W: 1007 L: 90 D: 903

Penta | [6, 38, 229, 487, 240]

LTC 40.0+0.4s

Elo   | 154.77 +- 13.83 (95%)

Conf  | 40.0+0.40s Threads=1 Hash=128MB

Games | N: 1002 W: 449 L: 30 D: 523

Penta | [0, 16, 136, 263, 86]

Reckless 0.8.0 JA vs other engines:

Kopyto 0.1.0 JA	2/2	+2	2 Games
Dumb 2.3	2/2	+2	2 Games
Chesslib 0.0.3 JA	2/2	+2	2 Games
Victoria 0.1 JA	2/2	+2	2 Games
Shallow Guess 0.1.0 JA	2/2	+2	2 Games
Rodent IV 0.33 JA	2/2	+2	2 Games
Meltdown 0.1 JA	2/2	+2	2 Games
PzChessBot 20250311T07 JA	2/2	+2	2 Games
Nakshatra 0.1 JA	2/2	+2	2 Games
Melsh Bot 1.0 JA	2/2	+2	2 Games
Limbobot 0.1 JA	2/2	+2	2 Games
Gravy 1.0 JA	2/2	+2	2 Games
Seawall 20250322 JA	2/2	+2	2 Games
Chess-3 JA	2/2	+2	2 Games
Ultrabrick dev.bd5adb0 JA	2/2	+2	2 Games
Maello 0.1 JA	2/2	+2	2 Games
Princhess 0.20 JA	1.5/2	+1	2 Games
Perseus 1.0 JA	1.5/2	+1	2 Games
Cheng4 0.48	1.5/2	+1	2 Games
Pawn 3.0 JA	1.5/2	+1	2 Games
Cinder 0.1.3 JA	1.5/2	+1	2 Games

Jim Ablett compiles:

Reckless 0.8.0 dev-2fe JA download