Iroh

Iroh is an in-progress chess engine written in Rust. It is affectionately named after a fictional character that wished to play board games every day.

Dependencies

Rust and Cargo. See the official docs: Install Rust

Tests

Run tests with cargo test

Run

Start the CLI interface in your terminal with cargo run.

TODO

• Draws and draw offers
  • Mutual agreement
  • Three-fold and fifty-move rules (non-automatic variants of five and seventyfive-move rules)
  • Dead position
  • https://en.wikipedia.org/wiki/Draw_(chess)#Draws_in_all_games
• Resignations
• Heuristics
  • Penalties for undefended pieces
  • Doubled, blocked, isolated pawns
  • Castling rights (penalty if king can't castle)
  • Centre control
  • King defense
  • Separate weightings of piece material and mobility
  • Checking & checkmate
  • Pieces
    • Knights
      • Decrease in value as pawns decrease
      • Trapped knight (A8/H8/A7/H7 or A1/H1/A2/H2)
    • Bishops
      • Small bonus for having both (covering both colours)
      • Trapped?
    • Rooks
      • Increasing value as pawns reduce
      • Open file
    • Queen
      • Penalty for moving too soon
• Search
• Performance, readability, etc refactorings
  • Track two (or three?) separate SAN lists rather than filtering the one list in GameState::determine_status
  • Is there a better way to do castling_moves.rs check for whether king would be in check without cloning GameState?
  • Shouldn't from_fen (both of them) return Result / do validation?
  • Replace some of these tuples with types, particularly in board.rs
  • Searching/evaluating more than needs be in some places
    • check.rs should stop further checks if result is true
  • Remove the specific pawn moves, not sure they are needed anymore. Could just generate RegularMove/AttackMove
  • CapturedPieces struct could do with better encapsulation
• Optimisations
  • When in check only search king moves, and moves that would place a piece between the attacker and king or capture the attacker.
  • When in double check only search king moves