Add naive knight move generation
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src/movegen/knight.rs
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184
src/movegen/knight.rs
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@ -0,0 +1,184 @@
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use crate::board::{Bitboard, Direction, Square};
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/// Compute a knight's movement.
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#[allow(unused)]
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pub fn knight_moves(square: Square) -> Bitboard {
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let board = square.into_bitboard();
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Direction::iter_knight()
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.map(|dir| dir.move_board(board))
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.fold(Bitboard::EMPTY, |lhs, rhs| lhs | rhs)
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}
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#[cfg(test)]
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mod test {
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use super::*;
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#[test]
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fn moves_first_rank() {
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assert_eq!(knight_moves(Square::A1), Square::B3 | Square::C2);
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assert_eq!(
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knight_moves(Square::B1),
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Square::A3 | Square::C3 | Square::D2
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);
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assert_eq!(
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knight_moves(Square::C1),
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Square::A2 | Square::B3 | Square::D3 | Square::E2
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);
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assert_eq!(
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knight_moves(Square::D1),
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Square::B2 | Square::C3 | Square::E3 | Square::F2
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);
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assert_eq!(
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knight_moves(Square::E1),
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Square::C2 | Square::D3 | Square::F3 | Square::G2
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);
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assert_eq!(
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knight_moves(Square::F1),
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Square::D2 | Square::E3 | Square::G3 | Square::H2
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);
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assert_eq!(
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knight_moves(Square::G1),
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Square::E2 | Square::F3 | Square::H3
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);
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assert_eq!(knight_moves(Square::H1), Square::F2 | Square::G3);
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}
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#[test]
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fn moves_last_rank() {
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assert_eq!(knight_moves(Square::A8), Square::B6 | Square::C7);
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assert_eq!(
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knight_moves(Square::B8),
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Square::A6 | Square::C6 | Square::D7
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);
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assert_eq!(
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knight_moves(Square::C8),
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Square::A7 | Square::B6 | Square::D6 | Square::E7
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);
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assert_eq!(
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knight_moves(Square::D8),
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Square::B7 | Square::C6 | Square::E6 | Square::F7
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);
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assert_eq!(
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knight_moves(Square::E8),
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Square::C7 | Square::D6 | Square::F6 | Square::G7
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);
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assert_eq!(
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knight_moves(Square::F8),
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Square::D7 | Square::E6 | Square::G6 | Square::H7
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);
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assert_eq!(
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knight_moves(Square::G8),
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Square::E7 | Square::F6 | Square::H6
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);
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assert_eq!(knight_moves(Square::H8), Square::F7 | Square::G6);
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}
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#[test]
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fn moves_first_file() {
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assert_eq!(knight_moves(Square::A1), Square::B3 | Square::C2);
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assert_eq!(
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knight_moves(Square::A2),
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Square::B4 | Square::C1 | Square::C3
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);
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assert_eq!(
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knight_moves(Square::A3),
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Square::B1 | Square::B5 | Square::C2 | Square::C4
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);
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assert_eq!(
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knight_moves(Square::A4),
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Square::B2 | Square::B6 | Square::C3 | Square::C5
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);
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assert_eq!(
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knight_moves(Square::A5),
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Square::B3 | Square::B7 | Square::C4 | Square::C6
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);
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assert_eq!(
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knight_moves(Square::A6),
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Square::B4 | Square::B8 | Square::C5 | Square::C7
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);
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assert_eq!(
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knight_moves(Square::A7),
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Square::B5 | Square::C6 | Square::C8
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);
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assert_eq!(knight_moves(Square::A8), Square::B6 | Square::C7);
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}
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#[test]
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fn moves_last_file() {
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assert_eq!(knight_moves(Square::H1), Square::G3 | Square::F2);
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assert_eq!(
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knight_moves(Square::H2),
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Square::G4 | Square::F1 | Square::F3
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);
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assert_eq!(
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knight_moves(Square::H3),
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Square::G1 | Square::G5 | Square::F2 | Square::F4
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);
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assert_eq!(
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knight_moves(Square::H4),
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Square::G2 | Square::G6 | Square::F3 | Square::F5
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);
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assert_eq!(
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knight_moves(Square::H5),
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Square::G3 | Square::G7 | Square::F4 | Square::F6
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);
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assert_eq!(
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knight_moves(Square::H6),
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Square::G4 | Square::G8 | Square::F5 | Square::F7
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);
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assert_eq!(
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knight_moves(Square::H7),
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Square::G5 | Square::F6 | Square::F8
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);
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assert_eq!(knight_moves(Square::H8), Square::G6 | Square::F7);
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}
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#[test]
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fn moves_middle() {
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assert_eq!(
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knight_moves(Square::D4),
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Square::B3
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| Square::B5
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| Square::C2
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| Square::C6
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| Square::E2
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| Square::E6
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| Square::F3
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| Square::F5
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);
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assert_eq!(
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knight_moves(Square::D5),
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Square::B4
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| Square::B6
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| Square::C3
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| Square::C7
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| Square::E3
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| Square::E7
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| Square::F4
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| Square::F6
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);
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assert_eq!(
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knight_moves(Square::E4),
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Square::C3
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| Square::C5
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| Square::D2
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| Square::D6
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| Square::F2
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| Square::F6
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| Square::G3
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| Square::G5
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);
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assert_eq!(
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knight_moves(Square::E5),
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Square::C4
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| Square::C6
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| Square::D3
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| Square::D7
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| Square::F3
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| Square::F7
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| Square::G4
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| Square::G6
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);
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}
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}
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@ -1,2 +1,3 @@
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// Move generation implementation details
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mod king;
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mod knight;
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