zobrist: add zobrist hashing to nodes
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res/scripts/gen_zobrist_keys.py
Executable file
56
res/scripts/gen_zobrist_keys.py
Executable file
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@ -0,0 +1,56 @@
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#!/usr/bin/env python3
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"""Generate Zobrist keys."""
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import random
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random.seed("vatu stop playing your queen first you have other pieces")
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TEMPLATE = """\
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pub const ZOBRIST_PIECES: [[[ZobristHash; 64]; 6]; 2] = [
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{}
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];
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pub const ZOBRIST_BLACK_TURN: ZobristHash = {};
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pub const ZOBRIST_CASTLE_WH_K: usize = 0;
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pub const ZOBRIST_CASTLE_WH_Q: usize = 1;
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pub const ZOBRIST_CASTLE_BL_K: usize = 2;
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pub const ZOBRIST_CASTLE_BL_Q: usize = 3;
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pub const ZOBRIST_CASTLES: [ZobristHash; 4] = [
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{}
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];
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pub const ZOBRIST_EN_PASSANT: [ZobristHash; 8] = [
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{}
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];
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"""
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def gen_hash():
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return random.getrandbits(64)
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def gen_pieces_keys():
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pieces_str = ""
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for color in range(2):
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pieces_str += " [\n"
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for piece in range(6):
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pieces_str += " [\n"
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for square in range(64):
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k = gen_hash()
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pieces_str += " {},\n".format(k)
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pieces_str += " ],\n"
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pieces_str += " ],\n"
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return pieces_str
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print(
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TEMPLATE.format(
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gen_pieces_keys(),
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gen_hash(),
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"\n".join([" {},".format(gen_hash()) for _ in range(4)]),
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"\n".join([" {},".format(gen_hash()) for _ in range(8)]),
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)
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)
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@ -190,10 +190,13 @@ impl Analyzer {
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let mut best_score = MIN_F32;
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let mut best_score = MIN_F32;
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let mut best_move = None;
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let mut best_move = None;
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for m in &mut moves {
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for m in &mut moves {
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node.apply_move(m);
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let hash_changes = node.apply_move(m);
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let result = self.negamax(node, -beta, -alpha, depth + 1);
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let result = self.negamax(node, -beta, -alpha, depth + 1);
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node.unmake_move(m);
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node.unmake_move(m, hash_changes);
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let score = -result.0;
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let score = -result.0;
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if self.debug && depth == 0 {
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self.log(format!("move {} evaluated {}", m.to_uci_string(), score));
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}
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if score > best_score {
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if score > best_score {
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best_score = score;
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best_score = score;
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best_move = Some(m.to_owned());
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best_move = Some(m.to_owned());
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@ -1,5 +1,6 @@
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//! Basic type definitions and functions.
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//! Basic type definitions and functions.
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// Reexport all precomputed board data for simplicity.
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pub use crate::precomputed::*;
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pub use crate::precomputed::*;
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/// Color type, used to index `Board.color`.
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/// Color type, used to index `Board.color`.
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@ -186,7 +186,9 @@ impl Engine {
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/// Apply a series of moves to the current node.
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/// Apply a series of moves to the current node.
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fn apply_moves(&mut self, moves: &mut Vec<Move>) {
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fn apply_moves(&mut self, moves: &mut Vec<Move>) {
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moves.iter_mut().for_each(|m| m.apply_to(&mut self.node.board, &mut self.node.game_state));
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for m in moves.iter_mut() {
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m.apply_to(&mut self.node.board, &mut self.node.game_state);
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}
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}
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}
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/// Start working on board, returning the best move found.
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/// Start working on board, returning the best move found.
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@ -11,6 +11,7 @@ pub mod precomputed;
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pub mod rules;
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pub mod rules;
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pub mod stats;
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pub mod stats;
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pub mod uci;
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pub mod uci;
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pub mod zobrist;
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fn main() {
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fn main() {
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let args = App::new("Vatu")
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let args = App::new("Vatu")
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@ -5,6 +5,7 @@ use std::fmt;
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use crate::board::*;
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use crate::board::*;
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use crate::castling::*;
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use crate::castling::*;
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use crate::rules::GameState;
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use crate::rules::GameState;
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use crate::zobrist::*;
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/// A movement, with before/after positions and optional promotion.
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/// A movement, with before/after positions and optional promotion.
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#[derive(Clone, PartialEq)]
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#[derive(Clone, PartialEq)]
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@ -45,66 +46,106 @@ impl Move {
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///
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///
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/// Set automatic queen promotion for pawns, register captured
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/// Set automatic queen promotion for pawns, register captured
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/// pieces and castle options.
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/// pieces and castle options.
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pub fn apply_to(&mut self, board: &mut Board, game_state: &mut GameState) {
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pub fn apply_to(&mut self, board: &mut Board, game_state: &mut GameState) -> ZobristHash {
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// Changes to a Zobrist hash due to this move.
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let mut changes: ZobristHash = 0;
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// Save current castling options to unmake later.
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// Save current castling options to unmake later.
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self.old_castles = game_state.castling;
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self.old_castles = game_state.castling;
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let piece = board.get_piece_on(self.source);
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let piece = board.get_piece_on(self.source);
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// Handle king castling.
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if piece == KING {
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if piece == KING {
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// Handle king castling.
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if let Some(castle) = self.get_castle() {
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if let Some(castle) = self.get_castle() {
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match castle {
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match castle {
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CASTLE_WH_K => {
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CASTLE_WH_K => {
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board.move_square(E1, G1);
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board.move_square(E1, G1);
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board.move_square(H1, F1);
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board.move_square(H1, F1);
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game_state.castling &= !CASTLE_WH_MASK;
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game_state.castling &= !CASTLE_WH_MASK;
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changes ^= ZOBRIST_CASTLES[ZOBRIST_CASTLE_WH_K];
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changes ^= ZOBRIST_CASTLES[ZOBRIST_CASTLE_WH_Q];
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}
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}
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CASTLE_WH_Q => {
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CASTLE_WH_Q => {
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board.move_square(E1, C1);
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board.move_square(E1, C1);
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board.move_square(A1, D1);
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board.move_square(A1, D1);
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game_state.castling &= !CASTLE_WH_MASK;
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game_state.castling &= !CASTLE_WH_MASK;
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changes ^= ZOBRIST_CASTLES[ZOBRIST_CASTLE_WH_K];
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changes ^= ZOBRIST_CASTLES[ZOBRIST_CASTLE_WH_Q];
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}
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}
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CASTLE_BL_K => {
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CASTLE_BL_K => {
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board.move_square(E8, G8);
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board.move_square(E8, G8);
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board.move_square(H8, F8);
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board.move_square(H8, F8);
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game_state.castling &= !CASTLE_BL_MASK;
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game_state.castling &= !CASTLE_BL_MASK;
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changes ^= ZOBRIST_CASTLES[ZOBRIST_CASTLE_BL_K];
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changes ^= ZOBRIST_CASTLES[ZOBRIST_CASTLE_BL_Q];
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}
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}
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CASTLE_BL_Q => {
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CASTLE_BL_Q => {
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board.move_square(E8, C8);
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board.move_square(E8, C8);
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board.move_square(A8, D8);
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board.move_square(A8, D8);
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game_state.castling &= !CASTLE_BL_MASK;
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game_state.castling &= !CASTLE_BL_MASK;
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changes ^= ZOBRIST_CASTLES[ZOBRIST_CASTLE_BL_K];
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changes ^= ZOBRIST_CASTLES[ZOBRIST_CASTLE_BL_Q];
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}
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}
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_ => { panic!("Invalid castle.") }
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_ => { panic!("Invalid castle.") }
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}
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}
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game_state.color = opposite(game_state.color);
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game_state.color = opposite(game_state.color);
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return
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changes ^= ZOBRIST_BLACK_TURN;
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return changes
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} else {
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} else {
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// If the king moved from starting square, remove it from castling options.
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// If the king moved from starting square, remove it from castling options.
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if self.source == E1 { game_state.castling &= !CASTLE_WH_MASK; }
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if self.source == E1 {
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else if self.source == E8 { game_state.castling &= !CASTLE_BL_MASK; }
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game_state.castling &= !CASTLE_WH_MASK;
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changes ^= ZOBRIST_CASTLES[ZOBRIST_CASTLE_WH_K];
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changes ^= ZOBRIST_CASTLES[ZOBRIST_CASTLE_WH_Q];
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}
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else if self.source == E8 {
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game_state.castling &= !CASTLE_BL_MASK;
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changes ^= ZOBRIST_CASTLES[ZOBRIST_CASTLE_BL_K];
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changes ^= ZOBRIST_CASTLES[ZOBRIST_CASTLE_BL_Q];
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}
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}
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}
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}
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}
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// Record captured piece if any.
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// Record captured piece if any.
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if !board.is_empty(self.dest) {
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if !board.is_empty(self.dest) {
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self.capture = Some(board.get_piece_on(self.dest));
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let captured_piece = board.get_piece_on(self.dest);
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changes ^= get_piece_hash(opposite(game_state.color), captured_piece, self.dest);
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self.capture = Some(captured_piece);
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}
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}
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// Move the piece.
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// Move the piece and apply promotion if any.
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board.move_square(self.source, self.dest);
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board.move_square(self.source, self.dest);
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changes ^= get_piece_hash(game_state.color, piece, self.source);
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// Apply promotion if any.
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if let Some(promotion_piece) = self.promotion {
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if let Some(piece) = self.promotion {
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board.set_piece(self.dest, PAWN, promotion_piece);
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board.set_piece(self.dest, PAWN, piece);
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changes ^= get_piece_hash(game_state.color, promotion_piece, self.dest);
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} else {
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changes ^= get_piece_hash(game_state.color, piece, self.dest);
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}
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}
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// If a rook moved, remove the castle side.
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// If a rook moved, remove the castle side.
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if self.source == A1 || self.dest == A1 { game_state.castling &= !CASTLE_WH_Q; }
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if self.source == A1 || self.dest == A1 {
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else if self.source == H1 || self.dest == H1 { game_state.castling &= !CASTLE_WH_K; }
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game_state.castling &= !CASTLE_WH_Q;
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else if self.source == A8 || self.dest == A8 { game_state.castling &= !CASTLE_BL_Q; }
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changes ^= ZOBRIST_CASTLES[ZOBRIST_CASTLE_WH_Q];
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else if self.source == H8 || self.dest == H8 { game_state.castling &= !CASTLE_BL_K; }
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}
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else if self.source == H1 || self.dest == H1 {
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game_state.castling &= !CASTLE_WH_K;
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changes ^= ZOBRIST_CASTLES[ZOBRIST_CASTLE_WH_K];
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}
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else if self.source == A8 || self.dest == A8 {
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game_state.castling &= !CASTLE_BL_Q;
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changes ^= ZOBRIST_CASTLES[ZOBRIST_CASTLE_BL_Q];
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}
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else if self.source == H8 || self.dest == H8 {
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game_state.castling &= !CASTLE_BL_K;
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changes ^= ZOBRIST_CASTLES[ZOBRIST_CASTLE_BL_K];
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}
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// Finally, switch to the opposing player in the game state.
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// Finally, switch to the opposing player in the game state.
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game_state.color = opposite(game_state.color);
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game_state.color = opposite(game_state.color);
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changes ^= ZOBRIST_BLACK_TURN;
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// Return changes as a Zobrist hash.
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changes
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}
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}
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/// Unmake a move.
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/// Unmake a move.
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13
src/node.rs
13
src/node.rs
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@ -4,6 +4,7 @@ use crate::board;
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use crate::movement::Move;
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use crate::movement::Move;
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use crate::rules;
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use crate::rules;
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use crate::stats;
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use crate::stats;
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use crate::zobrist;
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/// Analysis node: a board along with the game state.
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/// Analysis node: a board along with the game state.
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#[derive(Clone, PartialEq)]
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#[derive(Clone, PartialEq)]
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@ -12,6 +13,8 @@ pub struct Node {
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pub board: board::Board,
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pub board: board::Board,
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/// Game state.
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/// Game state.
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pub game_state: rules::GameState,
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pub game_state: rules::GameState,
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/// Zobrist hash of the node.
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pub hash: zobrist::ZobristHash,
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}
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}
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impl Node {
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impl Node {
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@ -20,16 +23,20 @@ impl Node {
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Node {
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Node {
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board: board::Board::new_empty(),
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board: board::Board::new_empty(),
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game_state: rules::GameState::new(),
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game_state: rules::GameState::new(),
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hash: zobrist::get_new_game_hash(),
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}
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}
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}
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}
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/// Apply a move to this node.
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/// Apply a move to this node.
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pub fn apply_move(&mut self, m: &mut Move) {
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pub fn apply_move(&mut self, m: &mut Move) -> zobrist::ZobristHash {
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m.apply_to(&mut self.board, &mut self.game_state);
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let changes = m.apply_to(&mut self.board, &mut self.game_state);
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self.hash ^= changes;
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changes
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}
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}
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pub fn unmake_move(&mut self, m: &Move) {
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pub fn unmake_move(&mut self, m: &Move, changes: zobrist::ZobristHash) {
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m.unmake(&mut self.board, &mut self.game_state);
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m.unmake(&mut self.board, &mut self.game_state);
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self.hash ^= changes;
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}
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}
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/// Return player moves from this node.
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/// Return player moves from this node.
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@ -1,6 +1,7 @@
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//! Ugly module with all kind of precomputed stuff.
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//! Ugly module with all kind of precomputed stuff.
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use crate::board::{Square, Bitboard};
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use crate::board::{Square, Bitboard};
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use crate::zobrist::ZobristHash;
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// Generated by gen_squares.py.
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// Generated by gen_squares.py.
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pub const A1: Square = 0;
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pub const A1: Square = 0;
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@ -480,3 +481,828 @@ pub const KNIGHT_RAYS: [Bitboard; 64] = [
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0b00000000_00010000_10100000_00000000_00000000_00000000_00000000_00000000,
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0b00000000_00010000_10100000_00000000_00000000_00000000_00000000_00000000,
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0b00000000_00100000_01000000_00000000_00000000_00000000_00000000_00000000,
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0b00000000_00100000_01000000_00000000_00000000_00000000_00000000_00000000,
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];
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];
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// Generated by gen_zobrist_keys.py.
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pub const ZOBRIST_PIECES: [[[ZobristHash; 64]; 6]; 2] = [
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[
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[
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5230485930162234062,
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5238617895699405985,
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4709781846936492931,
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||||||
|
6480409461267432904,
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||||||
|
8432831256155652419,
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||||||
|
8368355871961019630,
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||||||
|
6670979618372292347,
|
||||||
|
13946322022735355958,
|
||||||
|
11653327786003412444,
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||||||
|
8911941857523270608,
|
||||||
|
14005495020294378149,
|
||||||
|
7052745365841946574,
|
||||||
|
14947898973004813754,
|
||||||
|
16568135084751874917,
|
||||||
|
14416690837965125032,
|
||||||
|
15250579260894613093,
|
||||||
|
10390215563440607572,
|
||||||
|
10539080371013975717,
|
||||||
|
2553434971954616332,
|
||||||
|
5946151574540099307,
|
||||||
|
3953350499910303773,
|
||||||
|
16353801647154993729,
|
||||||
|
14581683459460399592,
|
||||||
|
1588972894843982356,
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||||||
|
13601876592648600167,
|
||||||
|
16416266883070977994,
|
||||||
|
9498392293510493264,
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|
13935546522649706747,
|
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|
11381865254854243368,
|
||||||
|
7863880077475816918,
|
||||||
|
13421787618868641563,
|
||||||
|
9679728077436941505,
|
||||||
|
17234589101232576295,
|
||||||
|
16231530893888101938,
|
||||||
|
6580659246984078181,
|
||||||
|
9987433780337895460,
|
||||||
|
8696404782017294090,
|
||||||
|
12360032408990421426,
|
||||||
|
6870496981670331011,
|
||||||
|
12033158465144986566,
|
||||||
|
17737575184655076961,
|
||||||
|
4096614345953467746,
|
||||||
|
10474845723594311031,
|
||||||
|
3072380023051822731,
|
||||||
|
12934338818107793655,
|
||||||
|
6904395950861413644,
|
||||||
|
13081228377736438990,
|
||||||
|
4449691796442505131,
|
||||||
|
14530599618042092556,
|
||||||
|
11883685823810881117,
|
||||||
|
14397843411117512826,
|
||||||
|
],
|
||||||
|
],
|
||||||
|
];
|
||||||
|
|
||||||
|
pub const ZOBRIST_BLACK_TURN: ZobristHash = 10021213122433903175;
|
||||||
|
|
||||||
|
pub const ZOBRIST_CASTLE_WH_K: usize = 0;
|
||||||
|
pub const ZOBRIST_CASTLE_WH_Q: usize = 1;
|
||||||
|
pub const ZOBRIST_CASTLE_BL_K: usize = 2;
|
||||||
|
pub const ZOBRIST_CASTLE_BL_Q: usize = 3;
|
||||||
|
|
||||||
|
pub const ZOBRIST_CASTLES: [ZobristHash; 4] = [
|
||||||
|
2292886189061561677,
|
||||||
|
1107787351814947557,
|
||||||
|
2627339987452959789,
|
||||||
|
9362433047582633881,
|
||||||
|
];
|
||||||
|
|
||||||
|
pub const ZOBRIST_EN_PASSANT: [ZobristHash; 8] = [
|
||||||
|
13446489326168201208,
|
||||||
|
16561127554913736295,
|
||||||
|
706457826239777201,
|
||||||
|
6940085010112087595,
|
||||||
|
16571136595117891883,
|
||||||
|
14041807556703902103,
|
||||||
|
8978789431920423267,
|
||||||
|
5492414369570698233,
|
||||||
|
];
|
||||||
|
|
|
||||||
49
src/zobrist.rs
Normal file
49
src/zobrist.rs
Normal file
|
|
@ -0,0 +1,49 @@
|
||||||
|
//! Functions related to Zobrist hashes.
|
||||||
|
|
||||||
|
use crate::board::*;
|
||||||
|
|
||||||
|
pub type ZobristHash = u64;
|
||||||
|
|
||||||
|
pub fn get_new_game_hash() -> ZobristHash {
|
||||||
|
return
|
||||||
|
get_piece_hash(WHITE, ROOK, A1)
|
||||||
|
^ get_piece_hash(WHITE, KNIGHT, B1)
|
||||||
|
^ get_piece_hash(WHITE, BISHOP, C1)
|
||||||
|
^ get_piece_hash(WHITE, QUEEN, D1)
|
||||||
|
^ get_piece_hash(WHITE, KING, E1)
|
||||||
|
^ get_piece_hash(WHITE, BISHOP, F1)
|
||||||
|
^ get_piece_hash(WHITE, KNIGHT, G1)
|
||||||
|
^ get_piece_hash(WHITE, ROOK, H1)
|
||||||
|
^ get_piece_hash(WHITE, PAWN, A2)
|
||||||
|
^ get_piece_hash(WHITE, PAWN, B2)
|
||||||
|
^ get_piece_hash(WHITE, PAWN, C2)
|
||||||
|
^ get_piece_hash(WHITE, PAWN, D2)
|
||||||
|
^ get_piece_hash(WHITE, PAWN, E2)
|
||||||
|
^ get_piece_hash(WHITE, PAWN, F2)
|
||||||
|
^ get_piece_hash(WHITE, PAWN, G2)
|
||||||
|
^ get_piece_hash(WHITE, PAWN, H2)
|
||||||
|
^ get_piece_hash(BLACK, PAWN, A7)
|
||||||
|
^ get_piece_hash(BLACK, PAWN, B7)
|
||||||
|
^ get_piece_hash(BLACK, PAWN, C7)
|
||||||
|
^ get_piece_hash(BLACK, PAWN, D7)
|
||||||
|
^ get_piece_hash(BLACK, PAWN, E7)
|
||||||
|
^ get_piece_hash(BLACK, PAWN, F7)
|
||||||
|
^ get_piece_hash(BLACK, PAWN, G7)
|
||||||
|
^ get_piece_hash(BLACK, PAWN, H7)
|
||||||
|
^ get_piece_hash(BLACK, ROOK, A8)
|
||||||
|
^ get_piece_hash(BLACK, KNIGHT, B8)
|
||||||
|
^ get_piece_hash(BLACK, BISHOP, C8)
|
||||||
|
^ get_piece_hash(BLACK, QUEEN, D8)
|
||||||
|
^ get_piece_hash(BLACK, KING, E8)
|
||||||
|
^ get_piece_hash(BLACK, BISHOP, F8)
|
||||||
|
^ get_piece_hash(BLACK, KNIGHT, G8)
|
||||||
|
^ get_piece_hash(BLACK, ROOK, H8)
|
||||||
|
^ ZOBRIST_CASTLES[ZOBRIST_CASTLE_WH_K]
|
||||||
|
^ ZOBRIST_CASTLES[ZOBRIST_CASTLE_WH_Q]
|
||||||
|
^ ZOBRIST_CASTLES[ZOBRIST_CASTLE_BL_K]
|
||||||
|
^ ZOBRIST_CASTLES[ZOBRIST_CASTLE_BL_Q]
|
||||||
|
}
|
||||||
|
|
||||||
|
pub fn get_piece_hash(color: Color, piece: Piece, square: Square) -> ZobristHash {
|
||||||
|
ZOBRIST_PIECES[color][piece][square as usize]
|
||||||
|
}
|
||||||
Reference in a new issue