Crate shakmaty_syzygy

Probe Syzygy endgame tablebases.

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

Example

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

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

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

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

let dtz = tables.probe_dtz(&pos)?;
assert!(matches!(dtz, MaybeRounded::Rounded(Dtz(-59))));

Errors

See SyzygyError for possible error conditions.

Cargo features

• variant: Enables support for Antichess and Atomic chess.

Structs

• Dtz
  DTZ₅₀′′. Based on the distance to zeroing of the half-move clock.
• Material
  A material key.
• TableType
  File extension and magic header bytes of Syzygy tables.
• Tablebase
  A collection of tables.

Enums

• AmbiguousWdl
  WDL₅₀ with ambiguity due to DTZ rounding.
• MaybeRounded
  A value that may be affected by DTZ rounding.
• Metric
  Metric stored in a table: WDL or DTZ.
• ProbeError
  Error when probing a table.
• SyzygyError
  Error when probing tablebase.
• Wdl
  WDL₅₀. 5-valued evaluation of a position in the context of the 50-move drawing rule.

Traits

• Syzygy
  A chess variant with Syzygy support.