https://github.com/samchenyu/javachessengine

Chess Engine Developed With The MiniMax Algorithm
https://github.com/samchenyu/javachessengine

chess-engine minimax minimax-alpha-beta-pruning oop piece-square-tables

Last synced: about 2 months ago
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Chess Engine Developed With The MiniMax Algorithm

• Host: GitHub
• URL: https://github.com/samchenyu/javachessengine
• Owner: SamChenYu
• License: apache-2.0
• Created: 2024-01-03T16:54:46.000Z (almost 1 year ago)
• Default Branch: Piece-2D-Array-Representation
• Last Pushed: 2024-09-12T14:57:24.000Z (4 months ago)
• Last Synced: 2024-09-13T03:14:25.737Z (4 months ago)
• Topics: chess-engine, minimax, minimax-alpha-beta-pruning, oop, piece-square-tables
• Language: Java
• Homepage:
• Size: 435 KB
• Stars: 3
• Watchers: 2
• Forks: 0
• Open Issues: 1
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# JavaChessEngine

In-Progress Chess Engine Developed With The MiniMax Algorithm Built From Scratch.

Current Estimated Elo (Depth 4) at 1150

 

## Match History

### Martin 250 Elo Bot (www.chess.com)

- 31/02/2024 Depth 1 Engine : LOSS 

- 04/02/2024 Depth 4 Engine: WIN 

### Sven 1100 Elo Bot (www.chess.com)

- 08/02/2024 Depth 4 Engine: WIN 

## EVALUATION Method  

The evaluation method is between -1 and 0.

1 is checkmate for white

-1 is checkmate for black

0 is equal evaluation or stalemate

The evaluation takes into account two factors:

Position difference and material difference.

The positional difference is calculated with piece square tables where each piece has assigned values on every square, determining the strength of the particular position. The material difference is calculated with a sigmoid function:  

$y = \frac{1}{1.1 + e^{(-x+4)}} \quad \text{for} \quad 1 < x < 39$

where x is the numerial material difference and y is the material evaluation.

These two factors are weighted dynamically, where very similiar material will weigh position more, whilst bigger material difference will weigh position less.  

[Link to PeSTO's Evaluation Function](https://www.chessprogramming.org/PeSTO%27s_Evaluation_Function)

[Link to the TalkChess forum discussion](http://www.talkchess.com/forum3/viewtopic.php?f=2&t=68311&start=19#)



  





    



[Link to RyiSnow's Chess Pieces](https://ryisnow.itch.io/pixel-art-chess-piece-images)