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psqt.py
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# flake8: noqa
from typing import List, Tuple
from config import Config
import chess
import chess.syzygy
############
# I'm using Pesto Evaluation function:
# https://www.chessprogramming.org/PeSTO%27s_Evaluation_Function
# values for Piece-Square Tables from Rofchade:
# http://www.talkchess.com/forum3/viewtopic.php?f=2&t=68311&start=19
############
MG_PIECE_VALUES = {
chess.PAWN: 82,
chess.KNIGHT: 337,
chess.BISHOP: 365,
chess.ROOK: 477,
chess.QUEEN: 1025,
chess.KING: 24000,
}
EG_PIECE_VALUES = {
chess.PAWN: 94,
chess.KNIGHT: 281,
chess.BISHOP: 297,
chess.ROOK: 512,
chess.QUEEN: 936,
chess.KING: 24000,
}
# fmt: off
MG_PAWN = [
0, 0, 0, 0, 0, 0, 0, 0,
98, 134, 61, 95, 68, 126, 34, -11,
-6, 7, 26, 31, 65, 56, 25, -20,
-14, 13, 6, 21, 23, 12, 17, -23,
-27, -2, -5, 12, 17, 6, 10, -25,
-26, -4, -4, -10, 3, 3, 33, -12,
-35, -1, -20, -23, -15, 24, 38, -22,
0, 0, 0, 0, 0, 0, 0, 0]
EG_PAWN = [
0, 0, 0, 0, 0, 0, 0, 0,
178, 173, 158, 134, 147, 132, 165, 187,
94, 100, 85, 67, 56, 53, 82, 84,
32, 24, 13, 5, -2, 4, 17, 17,
13, 9, -3, -7, -7, -8, 3, -1,
4, 7, -6, 1, 0, -5, -1, -8,
13, 8, 8, 10, 13, 0, 2, -7,
0, 0, 0, 0, 0, 0, 0, 0]
MG_KNIGHT = [
-167, -89, -34, -49, 61, -97, -15, -107,
-73, -41, 72, 36, 23, 62, 7, -17,
-47, 60, 37, 65, 84, 129, 73, 44,
-9, 17, 19, 53, 37, 69, 18, 22,
-13, 4, 16, 13, 28, 19, 21, -8,
-23, -9, 12, 10, 19, 17, 25, -16,
-29, -53, -12, -3, -1, 18, -14, -19,
-105, -21, -58, -33, -17, -28, -19, -23]
EG_KNIGHT = [
-58, -38, -13, -28, -31, -27, -63, -99,
-25, -8, -25, -2, -9, -25, -24, -52,
-24, -20, 10, 9, -1, -9, -19, -41,
-17, 3, 22, 22, 22, 11, 8, -18,
-18, -6, 16, 25, 16, 17, 4, -18,
-23, -3, -1, 15, 10, -3, -20, -22,
-42, -20, -10, -5, -2, -20, -23, -44,
-29, -51, -23, -15, -22, -18, -50, -64]
MG_BISHOP = [
-29, 4, -82, -37, -25, -42, 7, -8,
-26, 16, -18, -13, 30, 59, 18, -47,
-16, 37, 43, 40, 35, 50, 37, -2,
-4, 5, 19, 50, 37, 37, 7, -2,
-6, 13, 13, 26, 34, 12, 10, 4,
0, 15, 15, 15, 14, 27, 18, 10,
4, 15, 16, 0, 7, 21, 33, 1,
-33, -3, -14, -21, -13, -12, -39, -21]
EG_BISHOP = [
-14, -21, -11, -8, -7, -9, -17, -24,
-8, -4, 7, -12, -3, -13, -4, -14,
2, -8, 0, -1, -2, 6, 0, 4,
-3, 9, 12, 9, 14, 10, 3, 2,
-6, 3, 13, 19, 7, 10, -3, -9,
-12, -3, 8, 10, 13, 3, -7, -15,
-14, -18, -7, -1, 4, -9, -15, -27,
-23, -9, -23, -5, -9, -16, -5, -17]
MG_ROOK = [
32, 42, 32, 51, 63, 9, 31, 43,
27, 32, 58, 62, 80, 67, 26, 44,
-5, 19, 26, 36, 17, 45, 61, 16,
-24, -11, 7, 26, 24, 35, -8, -20,
-36, -26, -12, -1, 9, -7, 6, -23,
-45, -25, -16, -17, 3, 0, -5, -33,
-44, -16, -20, -9, -1, 11, -6, -71,
-19, -13, 1, 17, 16, 7, -37, -26]
EG_ROOK = [
13, 10, 18, 15, 12, 12, 8, 5,
11, 13, 13, 11, -3, 3, 8, 3,
7, 7, 7, 5, 4, -3, -5, -3,
4, 3, 13, 1, 2, 1, -1, 2,
3, 5, 8, 4, -5, -6, -8, -11,
-4, 0, -5, -1, -7, -12, -8, -16,
-6, -6, 0, 2, -9, -9, -11, -3,
-9, 2, 3, -1, -5, -13, 4, -20]
MG_QUEEN = [
-28, 0, 29, 12, 59, 44, 43, 45,
-24, -39, -5, 1, -16, 57, 28, 54,
-13, -17, 7, 8, 29, 56, 47, 57,
-27, -27, -16, -16, -1, 17, -2, 1,
-9, -26, -9, -10, -2, -4, 3, -3,
-14, 2, -11, -2, -5, 2, 14, 5,
-35, -8, 11, 2, 8, 15, -3, 1,
-1, -18, -9, 10, -15, -25, -31, -50]
EG_QUEEN = [
-9, 22, 22, 27, 27, 19, 10, 20,
-17, 20, 32, 41, 58, 25, 30, 0,
-20, 6, 9, 49, 47, 35, 19, 9,
3, 22, 24, 45, 57, 40, 57, 36,
-18, 28, 19, 47, 31, 34, 39, 23,
-16, -27, 15, 6, 9, 17, 10, 5,
-22, -23, -30, -16, -16, -23, -36, -32,
-33, -28, -22, -43, -5, -32, -20, -41]
MG_KING = [
-65, 23, 16, -15, -56, -34, 2, 13,
29, -1, -20, -7, -8, -4, -38, -29,
-9, 24, 2, -16, -20, 6, 22, -22,
-17, -20, -12, -27, -30, -25, -14, -36,
-49, -1, -27, -39, -46, -44, -33, -51,
-14, -14, -22, -46, -44, -30, -15, -27,
1, 7, -8, -64, -43, -16, 9, 8,
-15, 36, 12, -54, 8, -28, 24, 14]
EG_KING = [
-74, -35, -18, -18, -11, 15, 4, -17,
-12, 17, 14, 17, 17, 38, 23, 11,
10, 17, 23, 15, 20, 45, 44, 13,
-8, 22, 24, 27, 26, 33, 26, 3,
-18, -4, 21, 24, 27, 23, 9, -11,
-19, -3, 11, 21, 23, 16, 7, -9,
-27, -11, 4, 13, 14, 4, -5, -17,
-53, -34, -21, -11, -28, -14, -24, -43]
# fmt: on
MG_PESTO = {
chess.PAWN: MG_PAWN,
chess.KNIGHT: MG_KNIGHT,
chess.BISHOP: MG_BISHOP,
chess.ROOK: MG_ROOK,
chess.QUEEN: MG_QUEEN,
chess.KING: MG_KING,
}
EG_PESTO = {
chess.PAWN: EG_PAWN,
chess.KNIGHT: EG_KNIGHT,
chess.BISHOP: EG_BISHOP,
chess.ROOK: EG_ROOK,
chess.QUEEN: EG_QUEEN,
chess.KING: EG_KING,
}
############
# Tapered Evaluation: https://www.chessprogramming.org/Tapered_Eval
# Phase values are used to determine on what phase of the game
# we're currently at.
############
PAWN_PHASE = 0
KNIGHT_PHASE = 1
BISHOP_PHASE = 1
ROOK_PHASE = 2
QUEEN_PHASE = 4
TOTAL_PHASE = (
PAWN_PHASE * 16
+ KNIGHT_PHASE * 4
+ BISHOP_PHASE * 4
+ ROOK_PHASE * 4
+ QUEEN_PHASE * 2
)
PHASE_VALUES = [
PAWN_PHASE, PAWN_PHASE,
KNIGHT_PHASE, KNIGHT_PHASE,
BISHOP_PHASE, BISHOP_PHASE,
ROOK_PHASE, ROOK_PHASE,
QUEEN_PHASE, QUEEN_PHASE
]
def count_pieces(board: chess.Board) -> List[int]:
"""
Counts the number of each piece on the board.
:param
board: The board to count the pieces on.
:return:
A list of tuples containing the number of pieces of that type
and their phase value.
"""
wp = len(board.pieces(chess.PAWN, chess.WHITE))
wn = len(board.pieces(chess.KNIGHT, chess.WHITE))
wb = len(board.pieces(chess.BISHOP, chess.WHITE))
wr = len(board.pieces(chess.ROOK, chess.WHITE))
wq = len(board.pieces(chess.QUEEN, chess.WHITE))
bp = len(board.pieces(chess.PAWN, chess.BLACK))
bn = len(board.pieces(chess.KNIGHT, chess.BLACK))
bb = len(board.pieces(chess.BISHOP, chess.BLACK))
br = len(board.pieces(chess.ROOK, chess.BLACK))
bq = len(board.pieces(chess.QUEEN, chess.BLACK))
return [
wp,
bp,
wn,
bn,
wb,
bb,
wr,
br,
wq,
bq,
]
def get_phase(board: chess.Board) -> float:
"""
Calculates the phase of the game based on the number of pieces
on the board.
:param
pieces: A list of tuples containing the number of pieces of
that type and their phase value.
:return:
The phase of the game.
"""
pieces = count_pieces(board)
phase: float = TOTAL_PHASE
for piece_count, piece_phase in zip(pieces, PHASE_VALUES):
phase -= piece_count * piece_phase
phase = (phase * 256 + (TOTAL_PHASE / 2)) / TOTAL_PHASE
return phase
BOARD_EVALUATION_CACHE = {}
def board_evaluation_cache(fun):
def inner(board: chess.Board):
key = board.fen()
if key not in BOARD_EVALUATION_CACHE:
BOARD_EVALUATION_CACHE[key] = fun(board)
return BOARD_EVALUATION_CACHE[key]
return inner
@board_evaluation_cache
def board_evaluation(board: chess.Board) -> float:
"""
This functions receives a board and assigns a value to it, it acts as
an evaluation function of the current state for this game. It returns
Arguments:
- board: current board state.
Returns:
- total_value(int): integer representing
current value for this board.
"""
phase = get_phase(board)
mg = {
chess.WHITE: 0,
chess.BLACK: 0,
}
eg = {
chess.WHITE: 0,
chess.BLACK: 0,
}
# loop through all squares and sum their piece values for both sides
for square in range(64):
piece = board.piece_at(square)
if piece is None:
continue
if piece.color == chess.WHITE:
mg[piece.color] += (
MG_PESTO[piece.piece_type][square ^ 56]
+ MG_PIECE_VALUES[piece.piece_type]
)
eg[piece.color] += (
EG_PESTO[piece.piece_type][square ^ 56]
+ EG_PIECE_VALUES[piece.piece_type]
)
if piece.color == chess.BLACK:
mg[piece.color] += (
MG_PESTO[piece.piece_type][square]
+ MG_PIECE_VALUES[piece.piece_type]
)
eg[piece.color] += (
EG_PESTO[piece.piece_type][square]
+ EG_PIECE_VALUES[piece.piece_type]
)
# calculate board score based on phase
mg_score = mg[board.turn] - mg[not board.turn]
eg_score = eg[board.turn] - eg[not board.turn]
eval = ((mg_score * (256 - phase)) + (eg_score * phase)) / 256
return eval
def evaluate_piece(board: chess.Board, square: chess.Square, phase: float) -> float:
"""
Evaluates a piece on a given square.
Arguments:
- board: current board state.
- square: square to evaluate.
- phase: current phase of the game.
Returns:
- value(float): float representing
current value for this piece on this square.
"""
mg_score = 0
eg_score = 0
# get mid and end game score for single piece
piece = board.piece_at(square)
if piece is not None:
if piece.color == chess.WHITE:
mg_score += (
MG_PESTO[piece.piece_type][square ^ 56]
+ MG_PIECE_VALUES[piece.piece_type]
)
eg_score += (
EG_PESTO[piece.piece_type][square ^ 56]
+ EG_PIECE_VALUES[piece.piece_type]
)
if piece.color == chess.BLACK:
mg_score += (
MG_PESTO[piece.piece_type][square] + MG_PIECE_VALUES[piece.piece_type]
)
eg_score += (
EG_PESTO[piece.piece_type][square] + EG_PIECE_VALUES[piece.piece_type]
)
# evaluate piece value based on phase
eval = ((mg_score * (256 - phase)) + (eg_score * phase)) / 256
return eval
def evaluate_capture(board: chess.Board, move: chess.Move, phase: float) -> float:
"""
Evaluates a capture move based phase of the game.
Arguments:
- board: current board state.
- move: move to evaluate.
- phase: current phase of the game.
Returns:
- value(float): float representing
value for this capture.
"""
mg_score = 0
eg_score = 0
# en passant score
if board.is_en_passant(move):
return 0
capturing_piece = board.piece_at(move.from_square).piece_type # type: ignore
captured_piece = board.piece_at(move.to_square).piece_type # type: ignore
# get mid and end game difference of scores between captured
# and capturing piece
if capturing_piece is not None and captured_piece is not None:
mg_score += MG_PIECE_VALUES[captured_piece] - MG_PIECE_VALUES[capturing_piece]
eg_score += EG_PIECE_VALUES[captured_piece] - EG_PIECE_VALUES[capturing_piece]
# evaluate capture based on game's phase
eval = ((mg_score * (256 - phase)) + (eg_score * phase)) / 256
return eval