Topas 1.3.3 JA - new version chess engine

 

Topas - UCI Chess Engine 

Author: Sam Nelson

Topas is an open source UCI chess engine written in Rust with a focus on clean, readable code. Topas is a "from scratch" implementation I created as a hobby project with the goal of learning more about chess algorithms and Rust programming in general.

v.1.3.3:

The following features are implemented in this release:

Universal Chess Interface (UCI) support, described in the README

Chess board representation and fast attack/movement patterns using bitboards

Negamax with alpha-beta pruning, using a principal variation search, to efficiently search to a configurable depth

Iterative deepening with aspiration windows to allow for more efficient move ordering and time management

Transposition tables (with Zobrist hashing) for fast lookup and enhanced move ordering

Move ordering based on principal variation, cut nodes, capture moves sorted via MVV-LVA (Most Valuable Victim, Least Valuable Attacker), and killer moves

Quiescence search with delta pruning and static exchange evaluation (SEE) to mitigate the horizon effect

Tapered static evaluation based on piece values, piece-square tables (PST), and game state

Late move reductions to reduce the search space.

Topas 1.3.3 vs other engines:

Piglet 1.3.6	5/6	+4	6 Games
Magog 1.0	4.5/6	+3	6 Games
Dodecahedron 0.0.1.2 JA	3.5/6	+1	6 Games
GitChess 1.0	2.5/5	+0	5 Games
Rust Chess 0.1.7	2/5	-1	5 Games
Phalp 22032400 JA	4/4	+4	4 Games
Koedem 1.1.2 JA	1.5/4	-1	4 Games
Baryonyx 0.1.13	0.5/4	-3	4 Games
Alibaba 1.40 JA	3/3	+3	3 Games
Annie 2024-07-08	3/3	+3	3 Games
Catto 0.12.5	3/3	+3	3 Games
Purple Panda 19	2.5/3	+2	3 Games
DoctorB 1.2.1 JA	2.5/3	+2	3 Games
Dragonrose 0.26	1.5/3	+0	3 Games
Peripheral 1.1.3	1/3	-1	3 Games
Simplex 0.9.8 JA	1/3	-1	3 Games
Neuromancer 1.5	1/3	-1	3 Games
Elixir 3.0 JA	0/3	-3	3 Games
Lozza 3 Dev.874772a JA	0/3	-3	3 Games
Smaug 2.2.1 JA	0/3	-3	3 Games
Sentinel 1.01 JA	0/3	-3	3 Games

Jim Ablett compiles:

Topas 1.3.3 JA download