weeb-ce

A UCI chess engine written in C.

Features

• 120-square mailbox board representation with piece lists
• Pawn bitboards with precomputed set/clear masks
• Zobrist hashing for position keys and repetition detection
• Pseudo-legal move generation validated by perft
• Iterative deepening alpha-beta search with quiescence
• Move ordering: PV move, MVV-LVA, killer moves, history heuristic
• Principal variation hash table
• UCI protocol with time management

Building

make            # release build -> ./weebce
make debug      # debug build with ASSERT checks enabled
make clean

With Nix:

nix build       # result/bin/weebce
nix develop     # dev shell with gcc + make

Usage

weebce speaks UCI; point any UCI-compatible GUI (cutechess, Arena, en-croissant, ...) at the binary, or drive it by hand:

position startpos moves e2e4
go depth 6

Testing

Move generation is verified against the standard perft suite in src/perfsuite.epd (FEN positions with known node counts at depths 1-6).

Layout

File	Purpose
src/chess-engine.h	shared types, constants, macros
src/board.c	board state, FEN parsing
src/genmove.c	move generation
src/makemove.c	make/unmake move
src/attack.c	square attack detection
src/search.c	alpha-beta + quiescence search
src/evaluate.c	material + piece-square evaluation
src/pvtable.c	principal variation table
src/uci.c	UCI protocol loop
src/perft.c	perft move-generation testing