https://github.com/alemelis/bobby.jl

A mediocre chess moves validator
https://github.com/alemelis/bobby.jl

chess julia

Last synced: about 2 months ago
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A mediocre chess moves validator

• Host: GitHub
• URL: https://github.com/alemelis/bobby.jl
• Owner: alemelis
• License: mit
• Created: 2017-12-11T14:22:55.000Z (about 7 years ago)
• Default Branch: master
• Last Pushed: 2023-10-23T09:59:01.000Z (about 1 year ago)
• Last Synced: 2024-10-12T10:06:26.209Z (2 months ago)
• Topics: chess, julia
• Language: Julia
• Homepage:
• Size: 3.03 MB
• Stars: 8
• Watchers: 1
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# Bobby.jl

[![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)

[![Build Status](https://travis-ci.org/alemelis/Bobby.jl.svg?branch=master)](https://travis-ci.org/alemelis/Bobby.jl)

[![codecov](https://codecov.io/gh/alemelis/Bobby.jl/branch/master/graph/badge.svg)](https://codecov.io/gh/alemelis/Bobby.jl)

Bobby is a chess move validator, i.e. given a position and a candidate move, Bobby tells you whether the move is legal or not. He can also look for check/mates and stalemates.

## Features

- 64-bit [magic](https://www.chessprogramming.org/Magic_Bitboards) [bitboards](https://www.chessprogramming.org/Bitboards)

- [perft and divide](http://www.rocechess.ch/perft.html) calculation

- check check

- castling

- en-passant

- promotion

## Install

```

julia> ]add Bobby

```

## Play

You can't really play against Bobby yet, if you want to play a proper game try [Chess.jl](https://github.com/abahm/Chess.jl). However, you can compute the [perft](https://www.chessprogramming.org/Perft_Results) from any valid position. In the case of the starting position

```

julia> using Bobby

julia> b = Bobby.setBoard();

julia> pt = Bobby.perft(b, 5);

julia> pt.nodes

5-element Array{Int64,1}:

      20

     400

    8902

  197281

 4865609

```

You can also import the position from its FEN

```

julia> b = Bobby.loadFen("r3k2r/p1ppqpb1/bn2pnp1/3PN3/1p2P3/2N2Q1p/PPPBBPPP/R3K2R w KQkq - 0 0");

julia> Bobby.plainPrint(b)

   ▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄

 8 █Π ⋅ ⋅ ⋅ + ⋅ ⋅ Π █

 7 █o ⋅ o o Ψ o Δ ⋅ █

 6 █Δ ζ ⋅ ⋅ o ζ o ⋅ █

 5 █⋅ ⋅ ⋅ o ζ ⋅ ⋅ ⋅ █

 4 █⋅ o ⋅ ⋅ o ⋅ ⋅ ⋅ █

 3 █⋅ ⋅ ζ ⋅ ⋅ Ψ ⋅ o █

 2 █o o o Δ Δ o o o █

 1 █Π ⋅ ⋅ ⋅ + ⋅ ⋅ Π █

   ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀

    a b c d e f g h 

julia> pt = Bobby.perft(b, 4).nodes

4-element Array{Int64,1}:

      48

    2039

   97862

 4085603

```

## Benchmarks

```

julia> ]activate .

julia> using Bobby

julia> using PkgBenchmark

julia> bm = benchmarkpkg(Bobby)

julia> export_markdown("benchmark.md", bm)

```