Starzix - C++ chess engine

Elo

CCRL Blitz: 3557 (#30/716)

CCRL Rapid: 3473 (#30/580)

Ipman Bullet: 3340 (#39/51)

How to compile

Windows

clang++ -std=c++20 -march=native -O3 -DNDEBUG -Wl,/STACK:16777216 src/main.cpp -o Starzix.exe

Linux

clang++ -std=c++20 -march=native -O3 -DNDEBUG src/main.cpp -o starzix

UCI (Universal Chess Interface)

Options

• Hash (int, default 32, 1 to 1024) - transposition table size in MB

Extra commands

• display - display current position, fen and zobrist hash

• eval - display current position's evaluation from perspective of side to move

• perft <depth> - run perft from current position

• perftsplit <depth> - run split perft from current position

• bench <depth> - run benchmark, default depth 14

Features

Board

• Bitboards
• Zobrist hashing
• Pseudolegal move generation (magic bitboards for sliders, lookup tables for pawns, knights and king)
• Copymake make/undo move

NNUE evaluation

• (768->1024)x2->1
• Lc0 data
• SCReLU 181

Search

• Iterative deepening
• Aspiration windows
• Fail-soft Negamax
• Principal variation search
• Quiescence search
• Transposition table
• Alpha-beta pruning
• Reverse futility pruning
• Razoring
• Null move pruning
• Late move pruning
• Futility pruning
• SEE pruning
• Internal iterative reduction
• Late move reductions
• Singular extensions (with negative and double extensions)
• Check extension

Move ordering

• TT move
• Good noisy moves by SEE + MVV + noisy history
• Killer move
• Countermove
• Quiet moves by history
• Bad noisy moves

Moves history

• Main history
• Countermove history
• Follow-up move history
• Noisy history

Time management

• Any time control
• Soft and hard limits
• Nodes TM