Chess Plisco is a representation of a chess position in Perl. It also contains a UCI compatible chess engine. You can challenge the engine most of the time at https://lichess.org/@/plisco-bot.
It only works with Perl versions that are compiled with support for 64 bit integers!
The software is stable but still considered work in progress.
Since it is reasonably fast and offers a lot of functionality needed for chess engines, it can be used for rapid prototyping of a chess engine. Writing a basic implementation of the AlphaBeta algorithm with Chess::Plisco will not require more than 30 lines of code.
The library also has a very high test coverage so that you can probably use it as a reference implementation for your own experiments and tests.
Plisco 1.0.2 wkat's new?
avoid recomputations by @gflohr in #46
fix number overflow in transposition table by @gflohr in #49
improve installation instructions by @gflohr in #50
fix typo in README regarding cpanm usage by @gflohr in #51
update README with Perl interpreter installation info by @gflohr in #52
fix transposition table by @gflohr in #53
Plisco 1.0.1 vs other engines:
| Hunyadi 3.0 | 4.5/6 | +3 | 6 games |
| Raphael 1.8.1.0 | 0/6 | -6 | 6 games |
| Demolito 2025-12-16 | 0/6 | -6 | 6 games |
| Petrel 3.2 JA | 0/6 | -6 | 6 games |
| Soomi 1.1.8 | 0/6 | -6 | 6 games |
| Critter 1.6a | 0/5 | -5 | 5 games |
| Senpai 3.0.1 JA | 0/4 | -4 | 4 games |
| Grail 1.0.2 | 0/4 | -4 | 4 games |
| Vajolet2 3.0.0 | 0/4 | -4 | 4 games |
| Echo 1.0.0 | 1/2 | +0 | 2 games |
| Topas 1.3.3 JA | 0.5/2 | -1 | 2 games |
| Frog 2025-12-12 | 0/2 | -2 | 2 games |
| Vajolet2 3.0 | 0/2 | -2 | 2 games |
| Minke 3.0.0 JA | 0/2 | -2 | 2 games |
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