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evaluation.cpp
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evaluation.cpp
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#include "evaluation.hpp"
#include "util.hpp"
#include <cassert>
#include <cmath>
#include <iostream>
#include <stdexcept>
ADD_BASE_OPERATORS_FOR(chess::Rank);
ADD_BASE_OPERATORS_FOR(chess::File);
ADD_INCR_OPERATORS_FOR(chess::Rank);
ADD_INCR_OPERATORS_FOR(chess::File);
ADD_INCR_OPERATORS_FOR(chess::PieceType);
int evaluate_basic(const chess::Board& board) {
int ret = 0;
for (chess::PieceType pt = chess::PieceType::PAWN; pt <= chess::PieceType::QUEEN; ++pt) {
ret += chess::builtin::popcount(board.pieces(pt, board.sideToMove())) * get_value(pt);
ret -= chess::builtin::popcount(board.pieces(pt, ~board.sideToMove())) * get_value(pt);
}
return ret;
}
int evaluate_nnue(const nnue::Board& board) {
return prophet_utter_evaluation(board.get_prophet(), (uint8_t) board.sideToMove());
}
int evaluate(const chess::Board& board, bool debug) {
// Material value
int mv = 0;
int our_mv = 0;
int their_mv = 0;
for (chess::PieceType pt = chess::PieceType::PAWN; pt <= chess::PieceType::QUEEN; ++pt) {
our_mv += chess::builtin::popcount(board.pieces(pt, board.sideToMove())) * get_value(pt);
their_mv += chess::builtin::popcount(board.pieces(pt, ~board.sideToMove())) * get_value(pt);
}
mv += our_mv;
mv -= their_mv;
GameProgress progress = get_progress(our_mv, their_mv);
// Color advantage
int ca = 0;
if (progress == MIDGAME) {
ca = (board.sideToMove() == chess::Color::WHITE) ? 15 : -15;
}
// Center control
int cc = 0;
if (board.at(chess::SQ_D5) != chess::Piece::NONE) cc += (board.color(board.at(chess::SQ_D5)) == board.sideToMove()) ? 25 : -25;
if (board.at(chess::SQ_E5) != chess::Piece::NONE) cc += (board.color(board.at(chess::SQ_E5)) == board.sideToMove()) ? 25 : -25;
if (board.at(chess::SQ_D4) != chess::Piece::NONE) cc += (board.color(board.at(chess::SQ_D4)) == board.sideToMove()) ? 25 : -25;
if (board.at(chess::SQ_E4) != chess::Piece::NONE) cc += (board.color(board.at(chess::SQ_E4)) == board.sideToMove()) ? 25 : -25;
// Knight placement
static constexpr chess::Bitboard edges_mask =
chess::movegen::MASK_FILE[(int) chess::File::FILE_A] |
chess::movegen::MASK_RANK[(int) chess::Rank::RANK_1] |
chess::movegen::MASK_FILE[(int) chess::File::FILE_H] |
chess::movegen::MASK_RANK[(int) chess::Rank::RANK_8];
int np = 0;
np -= chess::builtin::popcount(board.pieces(chess::PieceType::KNIGHT, board.sideToMove()) & edges_mask) * 50;
np += chess::builtin::popcount(board.pieces(chess::PieceType::KNIGHT, ~board.sideToMove()) & edges_mask) * 50;
// Bishop placement
static constexpr chess::Bitboard black_squares = 0xAA55AA55AA55AA55;
int bp = 0;
BOTH_COLORS {
unsigned short white_square_count = 0;
unsigned short black_square_count = 0;
chess::Bitboard bishops = board.pieces(chess::PieceType::BISHOP, color);
while (bishops) {
chess::Square bishop = chess::builtin::poplsb(bishops);
if ((black_squares >> bishop) & 1) {
black_square_count++;
} else {
white_square_count++;
}
if (white_square_count && black_square_count) {
bp += color == board.sideToMove() ? 50 : -50;
break;
}
}
}
// Rook placement
int rp = 0;
rp += chess::builtin::popcount(board.pieces(chess::PieceType::ROOK, board.sideToMove()) & chess::movegen::MASK_RANK[(int) (board.sideToMove() == chess::Color::WHITE ? chess::Rank::RANK_7 : chess::Rank::RANK_2)]) * 30;
rp -= chess::builtin::popcount(board.pieces(chess::PieceType::ROOK, ~board.sideToMove()) & chess::movegen::MASK_RANK[(int) (~board.sideToMove() == chess::Color::WHITE ? chess::Rank::RANK_7 : chess::Rank::RANK_2)]) * 30;
// King placement
/*
function distance(x1, y1, x2, y2) {
return Math.hypot(x2 - x1, y2 - y1);
}
let table = [];
for (let y = 7; y > -1; --y) {
for (let x = 0; x < 8; ++x) {
table.push(Math.round(distance(x, y, 3.5, 3.5) * 20));
}
}
table[0] = Math.round(distance(1, 6, 3.5, 3.5) * 20);
table[7] = Math.round(distance(6, 6, 3.5, 3.5) * 20);
table[56] = Math.round(distance(1, 1, 3.5, 3.5) * 20);
table[63] = Math.round(distance(6, 1, 3.5, 3.5) * 20);
*/
static constexpr int king_pcsq_table[64] = {71, 86, 76, 71, 71, 76, 86, 71, 86, 71, 58, 51, 51, 58, 71, 86, 76, 58, 42, 32, 32, 42, 58, 76, 71, 51, 32, 14, 14, 32, 51, 71, 71, 51, 32, 14, 14, 32, 51, 71, 76, 58, 42, 32, 32, 42, 58, 76, 86, 71, 58, 51, 51, 58, 71, 86, 71, 86, 76, 71, 71, 76, 86, 71};
int kp = 0;
if (progress == MIDGAME) {
kp += king_pcsq_table[board.kingSq(board.sideToMove())];
kp -= king_pcsq_table[board.kingSq(~board.sideToMove())];
}
// Doubled pawns
int dp = 0;
for (chess::File file = chess::File::FILE_A; file <= chess::File::FILE_H; ++file) {
dp -= std::max(chess::builtin::popcount(board.pieces(chess::PieceType::PAWN, board.sideToMove()) & chess::movegen::MASK_FILE[(int) file]) - 1, 0) * 75;
dp += std::max(chess::builtin::popcount(board.pieces(chess::PieceType::PAWN, ~board.sideToMove()) & chess::movegen::MASK_FILE[(int) file]) - 1, 0) * 75;
}
// Passed pawns
int pp = 0;
BOTH_COLORS {
chess::Bitboard pawns = board.pieces(chess::PieceType::PAWN, color);
while (pawns) {
chess::Square sq = chess::builtin::poplsb(pawns);
chess::Bitboard pawns_ahead_mask = chess::movegen::MASK_FILE[(int) chess::utils::squareFile(sq)];
if (chess::utils::squareFile(sq) > chess::File::FILE_A) {
pawns_ahead_mask |= chess::movegen::MASK_FILE[(int) chess::utils::squareFile(sq) - 1];
}
if (chess::utils::squareFile(sq) < chess::File::FILE_H) {
pawns_ahead_mask |= chess::movegen::MASK_FILE[(int) chess::utils::squareFile(sq) + 1];
}
if (color == chess::Color::WHITE) {
for (chess::Rank rank = chess::Rank::RANK_1; rank <= chess::utils::squareRank(sq); ++rank) {
pawns_ahead_mask &= ~chess::movegen::MASK_RANK[(int) rank];
}
} else if (color == chess::Color::BLACK) {
for (chess::Rank rank = chess::Rank::RANK_8; rank >= chess::utils::squareRank(sq); --rank) {
pawns_ahead_mask &= ~chess::movegen::MASK_RANK[(int) rank];
}
} else {
throw std::logic_error("Invalid color");
}
if (!(board.pieces(chess::PieceType::PAWN, ~color) & pawns_ahead_mask)) {
if (progress == MIDGAME) {
pp += color == board.sideToMove() ? 30 : -30;
} else if (progress == ENDGAME) {
int score = 0;
if (color == chess::Color::WHITE) {
score = (int) (chess::utils::squareRank(sq) - (int) chess::Rank::RANK_1) * 50;
} else if (color == chess::Color::BLACK) {
score = (int) (chess::Rank::RANK_8 - (int) chess::utils::squareRank(sq)) * 50;
} else {
throw std::logic_error("Invalid color");
}
pp += color == board.sideToMove() ? score : -score;
} else {
throw std::logic_error("Invalid game progress");
}
}
}
}
// Isolated pawns
int ip = 0;
if (progress == MIDGAME) {
BOTH_COLORS {
chess::Bitboard pawns = board.pieces(chess::PieceType::PAWN, color);
while (pawns) {
chess::Square sq = chess::builtin::poplsb(pawns);
chess::Bitboard buddies_mask = 0;
if (chess::utils::squareFile(sq) > chess::File::FILE_A) {
buddies_mask |= chess::movegen::MASK_FILE[(int) chess::utils::squareFile(sq) - 1];
}
if (chess::utils::squareFile(sq) < chess::File::FILE_H) {
buddies_mask |= chess::movegen::MASK_FILE[(int) chess::utils::squareFile(sq) + 1];
}
if (!(board.pieces(chess::PieceType::PAWN, color) & buddies_mask)) {
ip += color == board.sideToMove() ? -15 : 15;
}
}
}
}
// Open files
int of = 0;
BOTH_COLORS {
chess::Bitboard rooks = board.pieces(chess::PieceType::ROOK, color);
while (rooks) {
chess::Square sq = chess::builtin::poplsb(rooks);
chess::File file = chess::utils::squareFile(sq);
chess::Bitboard pawns[2] = {
board.pieces(chess::PieceType::PAWN, chess::Color::WHITE) & chess::movegen::MASK_FILE[(int) file],
board.pieces(chess::PieceType::PAWN, chess::Color::BLACK) & chess::movegen::MASK_FILE[(int) file],
};
if (pawns[(uint8_t) ~color]) {
of += color == board.sideToMove() ? -5 : 5; // File is half-open
if (pawns[(uint8_t) color]) {
of += color == board.sideToMove() ? -5 : 5; // File is closed
}
}
}
}
// Sum up various scores
if (debug) {
std::cerr << "Material value " << mv << std::endl;
std::cerr << "Color advantage " << ca << std::endl;
std::cerr << "Center control " << cc << std::endl;
std::cerr << "Knight placement " << np << std::endl;
std::cerr << "Bishop placement " << bp << std::endl;
std::cerr << "Rook placement " << rp << std::endl;
std::cerr << "King placement " << kp << std::endl;
std::cerr << "Doubled pawns " << dp << std::endl;
std::cerr << "Passed pawns " << pp << std::endl;
std::cerr << "Isolated pawns " << ip << std::endl;
std::cerr << "Open files " << of << std::endl;
}
return mv + ca + cc + np + bp + rp + kp + dp + pp + ip + of;
}
int see(const chess::Board& board, const chess::Move& move, bool debug) {
assert(move.typeOf() != chess::Move::PROMOTION && move.typeOf() != chess::Move::ENPASSANT);
const chess::Square attacked_sq = move.to();
chess::Bitboard occ = board.occ();
chess::Bitboard attackers = attackers_for_side(board, attacked_sq, chess::Color::WHITE, occ) |
attackers_for_side(board, attacked_sq, chess::Color::BLACK, occ);
chess::Bitboard diagonal_sliders = board.pieces(chess::PieceType::BISHOP) | board.pieces(chess::PieceType::QUEEN);
chess::Bitboard orthogonal_sliders = board.pieces(chess::PieceType::ROOK) | board.pieces(chess::PieceType::QUEEN);
int ret = 0;
chess::PieceType attacked_pt;
{
const chess::Square attacker_sq = move.from();
const chess::PieceType attacker_pt = board.at<chess::PieceType>(attacker_sq);
occ &= ~(1ULL << attacker_sq);
attackers &= ~(1ULL << attacker_sq);
attacked_pt = attacker_pt;
if (attacker_pt == chess::PieceType::PAWN ||
attacker_pt == chess::PieceType::BISHOP ||
attacker_pt == chess::PieceType::QUEEN) {
diagonal_sliders &= ~(1ULL << attacker_sq);
attackers |= chess::movegen::attacks::bishop(attacked_sq, occ) & diagonal_sliders;
}
if (attacker_pt == chess::PieceType::PAWN ||
attacker_pt == chess::PieceType::ROOK ||
attacker_pt == chess::PieceType::QUEEN) {
orthogonal_sliders &= ~(1ULL << attacker_sq);
attackers |= chess::movegen::attacks::rook(attacked_sq, occ) & orthogonal_sliders;
}
}
if (board.at(move.to()) != chess::Piece::NONE) {
ret += get_value(board.at<chess::PieceType>(attacked_sq));
if (debug) std::cout << "S1 starts by gaining " << get_value(board.at<chess::PieceType>(attacked_sq)) << std::endl;
}
for (chess::Color side_to_move = ~board.sideToMove();; side_to_move = ~side_to_move) {
bool attacked = false;
for (chess::PieceType attacker_pt = chess::PieceType::PAWN; attacker_pt <= chess::PieceType::KING; ++attacker_pt) {
chess::Bitboard attacker = attackers & board.pieces(attacker_pt, side_to_move);
if (attacker) {
if (attacker_pt == chess::PieceType::KING && (attackers & board.them(~side_to_move))) {
break;
}
ret += side_to_move == board.sideToMove() ? get_value(attacked_pt) : -get_value(attacked_pt);
if (debug) {
std::cout << (side_to_move == board.sideToMove() ? "S1" : "S2") << " gains " << get_value(attacked_pt) << std::endl;
std::cout << "Net gains for S1: " << ret << std::endl;
}
const chess::Square attacker_sq = chess::builtin::lsb(attacker);
occ &= ~(1ULL << attacker_sq);
attackers &= ~(1ULL << attacker_sq);
attacked_pt = attacker_pt;
if (attacker_pt == chess::PieceType::PAWN ||
attacker_pt == chess::PieceType::BISHOP ||
attacker_pt == chess::PieceType::QUEEN) {
diagonal_sliders &= ~(1ULL << attacker_sq);
attackers |= chess::movegen::attacks::bishop(attacked_sq, occ) & diagonal_sliders;
}
if (attacker_pt == chess::PieceType::PAWN ||
attacker_pt == chess::PieceType::ROOK ||
attacker_pt == chess::PieceType::QUEEN) {
orthogonal_sliders &= ~(1ULL << attacker_sq);
attackers |= chess::movegen::attacks::rook(attacked_sq, occ) & orthogonal_sliders;
}
attacked = true;
break;
}
}
if (!attacked) {
break;
}
}
return ret;
}
int mvv_lva(const chess::Board& board, const chess::Move& move) {
static constexpr int scores[] = {
105,
104,
103,
102,
101,
100,
205,
204,
203,
202,
201,
200,
305,
304,
303,
302,
301,
300,
405,
404,
403,
402,
401,
400,
505,
504,
503,
502,
501,
500,
605,
604,
603,
602,
601,
600,
};
if (move.typeOf() == chess::Move::ENPASSANT) {
return scores[(uint8_t) chess::PieceType::PAWN * 6 + (uint8_t) chess::PieceType::PAWN];
} else if (board.at(move.to()) != chess::Piece::NONE) {
return scores[(uint8_t) board.at<chess::PieceType>(move.to()) * 6 + (uint8_t) board.at<chess::PieceType>(move.from())];
} else {
throw std::invalid_argument("Move must be a capture");
}
}