Reckless 0.8.0 - new version chess engine

 

Reckless, a Rust-based UCI chess engine.

Author: Arseniy Surkov   Rating Chess Engines Diary CEDR=3360

Reckless 0.8.0 what's new?

Reckless has come a long way since its early days as a solo project.

During the FIDE & Google Efficient Chess AI Challenge, I worked with Shahin (@peregrineshahin) on the team that finished in second place. After the competition in late February 2025, the whole search algorithm started being rebuilt from the ground up. Shortly after, @peregrineshahin joined the project as one of its co-authors, with Styx (@styxdoto) joining a bit later.

Together, we have transformed Reckless into a formidable chess engine, moving far and beyond the capabilities of its predecessor.

We are now releasing Reckless v0.8.0, one of the strongest chess engines in the world and the strongest chess engine written in Rust.

 Reckless 0.8.0 - Playing Strength

Reckless v0.8.0 is enormously stronger than the previous release. In practical terms, v0.7.0 is no longer a meaningful opponent of measuring progress. Nevertheless, using a balanced opening book 8moves_v3, the results of the progression are as follows:

STC 8.0+0.08s

Elo   | 334.77 +- 6.38 (95%)

Conf  | 8.0+0.08s Threads=1 Hash=16MB

Games | N: 10116 W: 7583 L: 38 D: 2495

Penta | [0, 4, 216, 2127, 2711]

https://recklesschess.space/test/7421/

LTC 40.0+0.40s

Elo   | 301.49 +- 8.15 (95%)

Conf  | 40.0+0.40s Threads=1 Hash=64MB

Games | N: 5004 W: 3506 L: 2 D: 1496

Penta | [0, 0, 150, 1200, 1152]

https://recklesschess.space/test/7422/

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

Reckless 0.8.0 download