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shakmaty-syzygy

A Rust library to probe Syzygy endgame tablebases, based on shakmaty.

Syzygy tables allow optimal play under the 50-move rule. Tables are available for positions with up to 6 (and experimentally 7) pieces.

Example

use shakmaty::Chess;
use shakmaty::fen::Fen;
use shakmaty_syzygy::{Tablebase, Wdl, Dtz, Syzygy};

let mut tables = Tablebase::new();
tables.add_directory("tables/regular")?;

let pos: Chess = "8/8/8/8/B7/N7/K2k4/8 b - - 0 1"
    .parse::<Fen>()?
    .position()?;

let wdl = tables.probe_wdl(&pos)?;
assert_eq!(wdl, Wdl::Loss);

let dtz = tables.probe_dtz(&pos)?;
assert_eq!(dtz, Dtz(-59));

Documentation

Read the documentation

Changelog

0.4.2
- Fix DTZ in en passant positions.
- Minimum Rust version 1.26.0.
- Use guaranteed lossless versions from u16 to usize.
- Provide i128 conversions for Wdl and Dtz.
0.4.1
- Fix debug assertion for Dtz(0).add_plies().
0.4.0
- Update to shakmaty 0.7, which has bugfixes with regard to insufficient material.
0.3.1
- Work around compiler bug in release mode.
0.3.0
- Rename Tablebases to Tablebase.
- Group file extension and magic as TableType in Syzygy trait.
0.2.2
- Implement support for wide DTZ values. These are required for some long 7 piece endgames.
- Fix panic on corrupted table.
0.2.1
- Should not panic on corrupted tables (even in debug mode).
- Switch from fnv to fxhash.
0.2.0
- Replace Wdl::from(dtz) with Wdl::from_dtz_after_zeroing(dtz).
- Remove isize conversions of Dtz and Wdl.
- Fix WDL of lone king in atomic chess.
- Support stable rust.
0.1.4
- Fix ordering of lead pawns.
0.1.3
- Add support for Atomic chess and Giveaway.
0.1.2
- Cosmetic tweak to DTZ in case of mate in 1.
0.1.1
- Optional serde-1 feature.
- Add Dtz.add_plies().
0.1.0
- First release.

Acknowledgement

Thanks to Ronald de Man for his Syzygy tablebases. The probing code is closely based on his implementation for Stockfish.

License