// Evaluation weights, initialized from UCI options
enum { Mobility, PawnStructure, PassedPawns, Space, KingDangerUs, KingDangerThem };
- Score Weights[6];
+ struct Weight { int mg, eg; } Weights[6];
typedef Value V;
#define S(mg, eg) make_score(mg, eg)
const Score Tempo = make_score(24, 11);
const Score RookOn7th = make_score(11, 20);
- const Score QueenOn7th = make_score( 3, 8);
const Score RookOnPawn = make_score(10, 28);
- const Score QueenOnPawn = make_score( 4, 20);
const Score RookOpenFile = make_score(43, 21);
const Score RookSemiopenFile = make_score(19, 10);
const Score BishopPawns = make_score( 8, 12);
const int BishopCheck = 2;
const int KnightCheck = 3;
- const int UnsupportedPinnedPiece = 2;
-
// KingDanger[Color][attackUnits] contains the actual king danger weighted
// scores, indexed by color and by a calculated integer number.
Score KingDanger[COLOR_NB][128];
Score evaluate_unstoppable_pawns(const Position& pos, Color us, const EvalInfo& ei);
Value interpolate(const Score& v, Phase ph, ScaleFactor sf);
- Score apply_weight(Score v, Score w);
- Score weight_option(const std::string& mgOpt, const std::string& egOpt, Score internalWeight);
+ Score apply_weight(Score v, const Weight& w);
+ Weight weight_option(const std::string& mgOpt, const std::string& egOpt, Score internalWeight);
}
score += MinorBehindPawn;
}
- if ( (Pt == ROOK || Pt == QUEEN)
- && relative_rank(Us, s) >= RANK_5)
+ if (Pt == ROOK)
{
- // Major piece on 7th rank and enemy king trapped on 8th
+ // Rook on 7th rank and enemy king trapped on 8th
if ( relative_rank(Us, s) == RANK_7
&& relative_rank(Us, pos.king_square(Them)) == RANK_8)
- score += Pt == ROOK ? RookOn7th : QueenOn7th;
+ score += RookOn7th;
- // Major piece attacking enemy pawns on the same rank/file
- Bitboard pawns = pos.pieces(Them, PAWN) & PseudoAttacks[ROOK][s];
- if (pawns)
- score += popcount<Max15>(pawns) * (Pt == ROOK ? RookOnPawn : QueenOnPawn);
- }
+ // Rook piece attacking enemy pawns on the same rank/file
+ if (relative_rank(Us, s) >= RANK_5)
+ {
+ Bitboard pawns = pos.pieces(Them, PAWN) & PseudoAttacks[ROOK][s];
+ if (pawns)
+ score += popcount<Max15>(pawns) * RookOnPawn;
+ }
- // Special extra evaluation for rooks
- if (Pt == ROOK)
- {
// Give a bonus for a rook on a open or semi-open file
if (ei.pi->semiopen(Us, file_of(s)))
score += ei.pi->semiopen(Them, file_of(s)) ? RookOpenFile : RookSemiopenFile;
// the pawn shelter (current 'score' value).
attackUnits = std::min(20, (ei.kingAttackersCount[Them] * ei.kingAttackersWeight[Them]) / 2)
+ 3 * (ei.kingAdjacentZoneAttacksCount[Them] + popcount<Max15>(undefended))
+ + 2 * (ei.pinnedPieces[Us] != 0)
- mg_value(score) / 32;
// Analyse the enemy's safe queen contact checks. Firstly, find the
if (b)
attackUnits += KnightCheck * popcount<Max15>(b);
- // Penalty for pinned pieces not defended by a pawn
- if (ei.pinnedPieces[Us] & ~ei.attackedBy[Us][PAWN])
- attackUnits += UnsupportedPinnedPiece;
-
// To index KingDanger[] attackUnits must be in [0, 99] range
attackUnits = std::min(99, std::max(0, attackUnits));
}
// apply_weight() weights score v by score w trying to prevent overflow
- Score apply_weight(Score v, Score w) {
+ Score apply_weight(Score v, const Weight& w) {
- return make_score((int(mg_value(v)) * mg_value(w)) / 0x100,
- (int(eg_value(v)) * eg_value(w)) / 0x100);
+ return make_score(mg_value(v) * w.mg / 256, eg_value(v) * w.eg / 256);
}
// weight_option() computes the value of an evaluation weight, by combining
// two UCI-configurable weights (midgame and endgame) with an internal weight.
- Score weight_option(const std::string& mgOpt, const std::string& egOpt, Score internalWeight) {
-
- // Scale option value from 100 to 256
- int mg = Options[mgOpt] * 256 / 100;
- int eg = Options[egOpt] * 256 / 100;
+ Weight weight_option(const std::string& mgOpt, const std::string& egOpt, Score internalWeight) {
- return apply_weight(make_score(mg, eg), internalWeight);
+ Weight w = { Options[mgOpt] * mg_value(internalWeight) / 100,
+ Options[egOpt] * eg_value(internalWeight) / 100 };
+ return w;
}
switch (idx) {
case PST: case IMBALANCE: case PAWN: case TOTAL:
ss << std::setw(20) << name << " | --- --- | --- --- | "
- << std::setw(6) << to_cp(mg_value(wScore - bScore)) << " "
- << std::setw(6) << to_cp(eg_value(wScore - bScore)) << " \n";
+ << std::setw(5) << to_cp(mg_value(wScore - bScore)) << " "
+ << std::setw(5) << to_cp(eg_value(wScore - bScore)) << " \n";
break;
default:
ss << std::setw(20) << name << " | " << std::noshowpos
<< std::setw(5) << to_cp(eg_value(wScore)) << " | "
<< std::setw(5) << to_cp(mg_value(bScore)) << " "
<< std::setw(5) << to_cp(eg_value(bScore)) << " | "
- << std::showpos
- << std::setw(6) << to_cp(mg_value(wScore - bScore)) << " "
- << std::setw(6) << to_cp(eg_value(wScore - bScore)) << " \n";
+ << std::setw(5) << to_cp(mg_value(wScore - bScore)) << " "
+ << std::setw(5) << to_cp(eg_value(wScore - bScore)) << " \n";
}
}
std::memset(terms, 0, sizeof(terms));
Value v = do_evaluate<true>(pos);
+ v = pos.side_to_move() == WHITE ? v : -v; // White's point of view
std::stringstream ss;
- ss << std::showpoint << std::showpos << std::fixed << std::setprecision(2)
- << " Eval term | White | Black | Total \n"
- << " | MG EG | MG EG | MG EG \n"
- << "---------------------+-------------+-------------+---------------\n";
+ ss << std::showpoint << std::noshowpos << std::fixed << std::setprecision(2)
+ << " Eval term | White | Black | Total \n"
+ << " | MG EG | MG EG | MG EG \n"
+ << "---------------------+-------------+-------------+-------------\n";
format_row(ss, "Material, PST, Tempo", PST);
format_row(ss, "Material imbalance", IMBALANCE);
format_row(ss, "Passed pawns", PASSED);
format_row(ss, "Space", SPACE);
- ss << "---------------------+-------------+-------------+---------------\n";
+ ss << "---------------------+-------------+-------------+-------------\n";
format_row(ss, "Total", TOTAL);
- ss << "\nScaling: " << std::noshowpos
- << std::setw(6) << 100.0 * ei.mi->game_phase() / 128.0 << "% MG, "
- << std::setw(6) << 100.0 * (1.0 - ei.mi->game_phase() / 128.0) << "% * "
- << std::setw(6) << (100.0 * sf) / SCALE_FACTOR_NORMAL << "% EG.\n"
- << "Total evaluation: " << to_cp(v);
+ ss << "\nTotal Evaluation: " << to_cp(v) << " (white side)\n";
return ss.str();
}
projects / stockfish / blobdiff