Chess

Project to create Chess game with graphical user interface using Pygame module. Also created move generation programme that generates legal chess moves to chosen depth in Stockfish format.

Chess game

To try out the offline game, download the following files: board.py, main.py & pieces.py. Install Pygame module with pip.

pip install pygame

Move generation

Download either of the move generation files and change the position FEN, as well as depth and check_to_depth values.

Performance comparison of move generation versions

Tested on Ryzen 5 3600/16 GB RAM/SSD

Test position 1

FEN: rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 (Initial position)

Depth 3 - 8902 nodes (20 initial nodes)

• v1: 4.52s (1.97 kN/s)
• v2: 0.48s (18.5 kN/s)
• v3: 0.05s (185 kN/s)

Test position 2

FEN: r3k2r/p1ppqpb1/bn2pnp1/3PN3/1p2P3/2N2Q1p/PPPBBPPP/R3K2R w KQkq -

Depth 3 - 97862 Nodes (48 initial nodes)

• v1: 50.1s (1.95 kN/s)
• v2: 6.18s (15.8 kN/s)
• v3: 0.33s (293 kN/s)

Test position 3

FEN: r3k2r/p6p/8/B7/1pp1p3/3b4/P6P/R3K2R w KQkq -

Depth 4 - 150072 Nodes (17 initial nodes)

• v1: 46.1s (3.25 kN/s)
• v2: 6.58s (22.8 kN/s)
• v3: 0.62s (241 kN/s)

Test position 4

FEN: 8/2p5/3p4/KP5r/1R3p1k/8/4P1P1/8 w - -

Depth 5 - 674624 Nodes (14 initial nodes)

• v1: 154s (4.38 kN/s)
• v2: 23.6s (28.6 kN/s)
• v3: 2.65s (255 kN/s)

Credits

This project took reference and inspiration from the following sources:

• Sebastian Lague's Chess AI
• KettCodes' Chess Game with Pygame
• Chessprogramming Wiki for various positions and perft results to debug move generation programme.
• Numpty Perft for additional test positions and perft results.
• World's Fastest Bitboard Chess Movegenerator for a guide on move generation and bitboards in C++.
• 64 bits representation and manipulation for bitboard representation and calculations.