#include "misc.h"
#include "pawns.h"
#include "thread.h"
+#include "timeman.h"
#include "uci.h"
#include "incbin/incbin.h"
using namespace std;
-using namespace Stockfish::Eval::NNUE;
namespace Stockfish {
else
os << scores[t][WHITE] << " | " << scores[t][BLACK];
- os << " | " << scores[t][WHITE] - scores[t][BLACK] << "\n";
+ os << " | " << scores[t][WHITE] - scores[t][BLACK] << " |\n";
return os;
}
}
namespace {
// Threshold for lazy and space evaluation
- constexpr Value LazyThreshold1 = Value(1565);
- constexpr Value LazyThreshold2 = Value(1102);
- constexpr Value SpaceThreshold = Value(11551);
- constexpr Value NNUEThreshold1 = Value(682);
- constexpr Value NNUEThreshold2 = Value(176);
+ constexpr Value LazyThreshold1 = Value(3130);
+ constexpr Value LazyThreshold2 = Value(2204);
+ constexpr Value SpaceThreshold = Value(11551);
// KingAttackWeights[PieceType] contains king attack weights by piece type
constexpr int KingAttackWeights[PIECE_TYPE_NB] = { 0, 0, 81, 52, 44, 10 };
S(0, 0), S(3, 44), S(37, 68), S(42, 60), S(0, 39), S(58, 43)
};
+ constexpr Value CorneredBishop = Value(50);
+
// Assorted bonuses and penalties
constexpr Score UncontestedOutpost = S( 1, 10);
constexpr Score BishopOnKingRing = S( 24, 0);
constexpr Score BishopXRayPawns = S( 4, 5);
- constexpr Score CorneredBishop = S( 50, 50);
constexpr Score FlankAttacks = S( 8, 0);
constexpr Score Hanging = S( 69, 36);
constexpr Score KnightOnQueen = S( 16, 11);
attackedBy[Us][Pt] = 0;
- while (b1) {
+ while (b1)
+ {
Square s = pop_lsb(b1);
// Find attacked squares, including x-ray attacks for bishops and rooks
{
Direction d = pawn_push(Us) + (file_of(s) == FILE_A ? EAST : WEST);
if (pos.piece_on(s + d) == make_piece(Us, PAWN))
- score -= !pos.empty(s + d + pawn_push(Us)) ? CorneredBishop * 4
- : pos.piece_on(s + d + d) == make_piece(Us, PAWN) ? CorneredBishop * 2
- : CorneredBishop;
+ score -= !pos.empty(s + d + pawn_push(Us)) ? 4 * make_score(CorneredBishop, CorneredBishop)
+ : 3 * make_score(CorneredBishop, CorneredBishop);
}
}
}
Color strongSide = eg > VALUE_DRAW ? WHITE : BLACK;
int sf = me->scale_factor(pos, strongSide);
- // If scale factor is not already specific, scale down via general heuristics
+ // If scale factor is not already specific, scale up/down via general heuristics
if (sf == SCALE_FACTOR_NORMAL)
{
if (pos.opposite_bishops())
// Initialize score by reading the incrementally updated scores included in
// the position object (material + piece square tables) and the material
// imbalance. Score is computed internally from the white point of view.
- Score score = pos.psq_score() + me->imbalance() + pos.this_thread()->contempt;
+ Score score = pos.psq_score() + me->imbalance() + pos.this_thread()->trend;
// Probe the pawn hash table
pe = Pawns::probe(pos);
// Early exit if score is high
auto lazy_skip = [&](Value lazyThreshold) {
- return abs(mg_value(score) + eg_value(score)) / 2 > lazyThreshold + pos.non_pawn_material() / 64;
+ return abs(mg_value(score) + eg_value(score)) > lazyThreshold + pos.non_pawn_material() / 32;
};
if (lazy_skip(LazyThreshold1))
v = (v / 16) * 16;
// Side to move point of view
- v = (pos.side_to_move() == WHITE ? v : -v) + Tempo;
+ v = (pos.side_to_move() == WHITE ? v : -v);
return v;
}
- // specifically correct for cornered bishops to fix FRC with NNUE.
+
+ /// Fisher Random Chess: correction for cornered bishops, to fix chess960 play with NNUE
+
Value fix_FRC(const Position& pos) {
- Value bAdjust = Value(0);
+ constexpr Bitboard Corners = 1ULL << SQ_A1 | 1ULL << SQ_H1 | 1ULL << SQ_A8 | 1ULL << SQ_H8;
- constexpr Value p1=Value(209), p2=Value(136), p3=Value(148);
+ if (!(pos.pieces(BISHOP) & Corners))
+ return VALUE_ZERO;
- Color Us = pos.side_to_move();
- if ( (pos.pieces(Us, BISHOP) & relative_square(Us, SQ_A1))
- && (pos.pieces(Us, PAWN) & relative_square(Us, SQ_B2)))
- {
- bAdjust -= !pos.empty(relative_square(Us,SQ_B3)) ? p1
- : pos.piece_on(relative_square(Us,SQ_C3)) == make_piece(Us, PAWN) ? p2
- : p3;
- }
- if ( (pos.pieces(Us, BISHOP) & relative_square(Us, SQ_H1))
- && (pos.pieces(Us, PAWN) & relative_square(Us, SQ_G2)))
- {
- bAdjust -= !pos.empty(relative_square(Us,SQ_G3)) ? p1
- : pos.piece_on(relative_square(Us,SQ_F3)) == make_piece(Us, PAWN) ? p2
- : p3;
- }
- if ( (pos.pieces(~Us, BISHOP) & relative_square(Us, SQ_A8))
- && (pos.pieces(~Us, PAWN) & relative_square(Us, SQ_B7)))
- {
- bAdjust += !pos.empty(relative_square(Us,SQ_B6)) ? p1
- : pos.piece_on(relative_square(Us,SQ_C6)) == make_piece(~Us, PAWN) ? p2
- : p3;
- }
- if ( (pos.pieces(~Us, BISHOP) & relative_square(Us, SQ_H8))
- && (pos.pieces(~Us, PAWN) & relative_square(Us, SQ_G7)))
- {
- bAdjust += !pos.empty(relative_square(Us,SQ_G6)) ? p1
- : pos.piece_on(relative_square(Us,SQ_F6)) == make_piece(~Us, PAWN) ? p2
- : p3;
- }
- return bAdjust;
+ int correction = 0;
+
+ if ( pos.piece_on(SQ_A1) == W_BISHOP
+ && pos.piece_on(SQ_B2) == W_PAWN)
+ correction += !pos.empty(SQ_B3) ? -CorneredBishop * 4
+ : -CorneredBishop * 3;
+
+ if ( pos.piece_on(SQ_H1) == W_BISHOP
+ && pos.piece_on(SQ_G2) == W_PAWN)
+ correction += !pos.empty(SQ_G3) ? -CorneredBishop * 4
+ : -CorneredBishop * 3;
+
+ if ( pos.piece_on(SQ_A8) == B_BISHOP
+ && pos.piece_on(SQ_B7) == B_PAWN)
+ correction += !pos.empty(SQ_B6) ? CorneredBishop * 4
+ : CorneredBishop * 3;
+
+ if ( pos.piece_on(SQ_H8) == B_BISHOP
+ && pos.piece_on(SQ_G7) == B_PAWN)
+ correction += !pos.empty(SQ_G6) ? CorneredBishop * 4
+ : CorneredBishop * 3;
+
+ return pos.side_to_move() == WHITE ? Value(correction)
+ : -Value(correction);
}
-} // namespace
+} // namespace Eval
/// evaluate() is the evaluator for the outer world. It returns a static
else
{
// Scale and shift NNUE for compatibility with search and classical evaluation
- auto adjusted_NNUE = [&](){
- int mat = pos.non_pawn_material() + 2 * PawnValueMg * pos.count<PAWN>();
- Value nnueValue = NNUE::evaluate(pos) * (641 + mat / 32 - 4 * pos.rule50_count()) / 1024 + Tempo;
+ auto adjusted_NNUE = [&]()
+ {
+ int scale = 903
+ + 32 * pos.count<PAWN>()
+ + 32 * pos.non_pawn_material() / 1024;
+
+ Value nnue = NNUE::evaluate(pos, true) * scale / 1024;
if (pos.is_chess960())
- nnueValue += fix_FRC(pos);
+ nnue += fix_FRC(pos);
- return nnueValue;
+ return nnue;
};
- // If there is PSQ imbalance use classical eval, with small probability if it is small
+ // If there is PSQ imbalance we use the classical eval, but we switch to
+ // NNUE eval faster when shuffling or if the material on the board is high.
+ int r50 = pos.rule50_count();
Value psq = Value(abs(eg_value(pos.psq_score())));
- int r50 = 16 + pos.rule50_count();
- bool largePsq = psq * 16 > (NNUEThreshold1 + pos.non_pawn_material() / 64) * r50;
- bool classical = largePsq || (psq > PawnValueMg / 4 && !(pos.this_thread()->nodes & 0xB));
-
- // Use classical evaluation for really low piece endgames.
- // The most critical case is a bishop + A/H file pawn vs naked king draw.
- bool strongClassical = pos.non_pawn_material() < 2 * RookValueMg && pos.count<PAWN>() < 2;
-
- v = classical || strongClassical ? Evaluation<NO_TRACE>(pos).value() : adjusted_NNUE();
-
- // If the classical eval is small and imbalance large, use NNUE nevertheless.
- // For the case of opposite colored bishops, switch to NNUE eval with
- // small probability if the classical eval is less than the threshold.
- if ( largePsq && !strongClassical
- && ( abs(v) * 16 < NNUEThreshold2 * r50
- || ( pos.opposite_bishops()
- && abs(v) * 16 < (NNUEThreshold1 + pos.non_pawn_material() / 64) * r50
- && !(pos.this_thread()->nodes & 0xB))))
- v = adjusted_NNUE();
+ bool classical = psq * 5 > (750 + pos.non_pawn_material() / 64) * (5 + r50);
+
+ v = classical ? Evaluation<NO_TRACE>(pos).value() // classical
+ : adjusted_NNUE(); // NNUE
}
// Damp down the evaluation linearly when shuffling
/// descriptions and values of each evaluation term. Useful for debugging.
/// Trace scores are from white's point of view
-std::string Eval::trace(const Position& pos) {
+std::string Eval::trace(Position& pos) {
if (pos.checkers())
return "Final evaluation: none (in check)";
std::memset(scores, 0, sizeof(scores));
- pos.this_thread()->contempt = SCORE_ZERO; // Reset any dynamic contempt
+ pos.this_thread()->trend = SCORE_ZERO; // Reset any dynamic contempt
v = Evaluation<TRACE>(pos).value();
ss << std::showpoint << std::noshowpos << std::fixed << std::setprecision(2)
- << " Term | White | Black | Total \n"
- << " | MG EG | MG EG | MG EG \n"
- << " ------------+-------------+-------------+------------\n"
- << " Material | " << Term(MATERIAL)
- << " Imbalance | " << Term(IMBALANCE)
- << " Pawns | " << Term(PAWN)
- << " Knights | " << Term(KNIGHT)
- << " Bishops | " << Term(BISHOP)
- << " Rooks | " << Term(ROOK)
- << " Queens | " << Term(QUEEN)
- << " Mobility | " << Term(MOBILITY)
- << " King safety | " << Term(KING)
- << " Threats | " << Term(THREAT)
- << " Passed | " << Term(PASSED)
- << " Space | " << Term(SPACE)
- << " Winnable | " << Term(WINNABLE)
- << " ------------+-------------+-------------+------------\n"
- << " Total | " << Term(TOTAL);
+ << " Contributing terms for the classical eval:\n"
+ << "+------------+-------------+-------------+-------------+\n"
+ << "| Term | White | Black | Total |\n"
+ << "| | MG EG | MG EG | MG EG |\n"
+ << "+------------+-------------+-------------+-------------+\n"
+ << "| Material | " << Term(MATERIAL)
+ << "| Imbalance | " << Term(IMBALANCE)
+ << "| Pawns | " << Term(PAWN)
+ << "| Knights | " << Term(KNIGHT)
+ << "| Bishops | " << Term(BISHOP)
+ << "| Rooks | " << Term(ROOK)
+ << "| Queens | " << Term(QUEEN)
+ << "| Mobility | " << Term(MOBILITY)
+ << "|King safety | " << Term(KING)
+ << "| Threats | " << Term(THREAT)
+ << "| Passed | " << Term(PASSED)
+ << "| Space | " << Term(SPACE)
+ << "| Winnable | " << Term(WINNABLE)
+ << "+------------+-------------+-------------+-------------+\n"
+ << "| Total | " << Term(TOTAL)
+ << "+------------+-------------+-------------+-------------+\n";
- v = pos.side_to_move() == WHITE ? v : -v;
+ if (Eval::useNNUE)
+ ss << '\n' << NNUE::trace(pos) << '\n';
- ss << "\nClassical evaluation: " << to_cp(v) << " (white side)\n";
+ ss << std::showpoint << std::showpos << std::fixed << std::setprecision(2) << std::setw(15);
+ v = pos.side_to_move() == WHITE ? v : -v;
+ ss << "\nClassical evaluation " << to_cp(v) << " (white side)\n";
if (Eval::useNNUE)
{
- v = NNUE::evaluate(pos);
+ v = NNUE::evaluate(pos, false);
v = pos.side_to_move() == WHITE ? v : -v;
- ss << "\nNNUE evaluation: " << to_cp(v) << " (white side)\n";
+ ss << "NNUE evaluation " << to_cp(v) << " (white side)\n";
}
v = evaluate(pos);
v = pos.side_to_move() == WHITE ? v : -v;
- ss << "\nFinal evaluation: " << to_cp(v) << " (white side)\n";
+ ss << "Final evaluation " << to_cp(v) << " (white side)";
+ if (Eval::useNNUE)
+ ss << " [with scaled NNUE, hybrid, ...]";
+ ss << "\n";
return ss.str();
}
projects / stockfish / blobdiff