shakmaty-syzygy 0.2.1

Probe Syzygy tablebases


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

Build Status

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


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

let mut tables = Tablebases::new();

let pos: Chess = "8/8/8/8/B7/N7/K2k4/8 b - - 0 1"

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

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


Read the documentation


  • 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.


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


shakmaty-syzygy is licensed under the GPL-3.0 (or any later version at your option). See the COPYING file for the full license text.