constexpr Bitboard Center = (FileDBB | FileEBB) & (Rank4BB | Rank5BB);
constexpr Bitboard KingFlank[FILE_NB] = {
- QueenSide, QueenSide, QueenSide,
+ QueenSide ^ FileDBB, QueenSide, QueenSide,
CenterFiles, CenterFiles,
- KingSide, KingSide, KingSide
+ KingSide, KingSide, KingSide ^ FileEBB
};
// Threshold for lazy and space evaluation
S(0, 0), S(0, 24), S(38, 71), S(38, 61), S(0, 38), S(36, 38)
};
- // ThreatByKing[on one/on many] contains bonuses for king attacks on
- // pawns or pieces which are not pawn-defended.
- constexpr Score ThreatByKing[] = { S(30, 62), S(-9, 160) };
-
// PassedRank[Rank] contains a bonus according to the rank of a passed pawn
constexpr Score PassedRank[RANK_NB] = {
- S(0, 0), S(4, 17), S(7, 20), S(14, 36), S(42, 62), S(165, 171), S(279, 252)
+ S(0, 0), S(5, 18), S(12, 23), S(10, 31), S(57, 62), S(163, 167), S(271, 250)
};
// PassedFile[File] contains a bonus according to the file of a passed pawn
constexpr Score PassedFile[FILE_NB] = {
- S( 11, 14), S( 0, -5), S(-2, -8), S(-25,-13),
- S(-25,-13), S(-2, -8), S( 0, -5), S( 11, 14)
+ S( -1, 7), S( 0, 9), S(-9, -8), S(-30,-14),
+ S(-30,-14), S(-9, -8), S( 0, 9), S( -1, 7)
};
// PassedDanger[Rank] contains a term to weight the passed score
- constexpr int PassedDanger[RANK_NB] = { 0, 0, 0, 2, 7, 12, 19 };
-
- // KingProtector[PieceType-2] contains a penalty according to distance from king
- constexpr Score KingProtector[] = { S(4, 6), S(6, 3), S(1, 0), S(0, -2) };
+ constexpr int PassedDanger[RANK_NB] = { 0, 0, 0, 3, 7, 11, 20 };
// Assorted bonuses and penalties
- constexpr Score BishopPawns = S( 3, 5);
- constexpr Score CloseEnemies = S( 8, 0);
- constexpr Score Connectivity = S( 3, 1);
+ constexpr Score BishopPawns = S( 3, 7);
+ constexpr Score CloseEnemies = S( 6, 0);
constexpr Score CorneredBishop = S( 50, 50);
- constexpr Score Hanging = S( 52, 30);
- constexpr Score HinderPassedPawn = S( 5, -1);
+ constexpr Score Hanging = S( 57, 32);
+ constexpr Score HinderPassedPawn = S( 8, 0);
+ constexpr Score KingProtector = S( 6, 6);
constexpr Score KnightOnQueen = S( 21, 11);
- constexpr Score LongDiagonalBishop = S( 22, 0);
+ constexpr Score LongDiagonalBishop = S( 46, 0);
constexpr Score MinorBehindPawn = S( 16, 0);
- constexpr Score Overload = S( 10, 5);
- constexpr Score PawnlessFlank = S( 20, 80);
- constexpr Score RookOnPawn = S( 8, 24);
+ constexpr Score Overload = S( 13, 6);
+ constexpr Score PawnlessFlank = S( 19, 84);
+ constexpr Score RookOnPawn = S( 10, 30);
constexpr Score SliderOnQueen = S( 42, 21);
- constexpr Score ThreatByPawnPush = S( 49, 30);
+ constexpr Score ThreatByKing = S( 23, 76);
+ constexpr Score ThreatByPawnPush = S( 45, 40);
constexpr Score ThreatByRank = S( 16, 3);
- constexpr Score ThreatBySafePawn = S(165,133);
+ constexpr Score ThreatBySafePawn = S(173,102);
constexpr Score TrappedRook = S( 92, 0);
constexpr Score WeakQueen = S( 50, 10);
- constexpr Score WeakUnopposedPawn = S( 5, 26);
+ constexpr Score WeakUnopposedPawn = S( 5, 29);
#undef S
mobility[Us] += MobilityBonus[Pt - 2][mob];
- // Penalty if the piece is far from the king
- score -= KingProtector[Pt - 2] * distance(s, pos.square<KING>(Us));
-
if (Pt == BISHOP || Pt == KNIGHT)
{
// Bonus if piece is on an outpost square or can reach one
else if (bb &= b & ~pos.pieces(Us))
score += Outpost[Pt == BISHOP][bool(attackedBy[Us][PAWN] & bb)];
- // Bonus when behind a pawn
- if ( relative_rank(Us, s) < RANK_5
- && (pos.pieces(PAWN) & (s + pawn_push(Us))))
+ // Knight and Bishop bonus for being right behind a pawn
+ if (shift<Down>(pos.pieces(PAWN)) & s)
score += MinorBehindPawn;
+ // Penalty if the piece is far from the king
+ score -= KingProtector * distance(s, pos.square<KING>(Us));
+
if (Pt == BISHOP)
{
// Penalty according to number of pawns on the same color square as the
* (1 + popcount(blocked & CenterFiles));
// Bonus for bishop on a long diagonal which can "see" both center squares
- if (more_than_one(Center & (attacks_bb<BISHOP>(s, pos.pieces(PAWN)) | s)))
+ if (more_than_one(attacks_bb<BISHOP>(s, pos.pieces(PAWN)) & Center))
score += LongDiagonalBishop;
}
: AllSquares ^ Rank1BB ^ Rank2BB ^ Rank3BB);
const Square ksq = pos.square<KING>(Us);
- Bitboard weak, b, b1, b2, safe, unsafeChecks;
+ Bitboard kingFlank, weak, b, b1, b2, safe, unsafeChecks;
// King shelter and enemy pawns storm
Score score = pe->king_safety<Us>(pos, ksq);
+ // Find the squares that opponent attacks in our king flank, and the squares
+ // which are attacked twice in that flank but not defended by our pawns.
+ kingFlank = KingFlank[file_of(ksq)];
+ b1 = attackedBy[Them][ALL_PIECES] & kingFlank & Camp;
+ b2 = b1 & attackedBy2[Them] & ~attackedBy[Us][PAWN];
+
+ int tropism = popcount(b1) + popcount(b2);
+
// Main king safety evaluation
if (kingAttackersCount[Them] > 1 - pos.count<QUEEN>(Them))
{
unsafeChecks &= mobilityArea[Them];
kingDanger += kingAttackersCount[Them] * kingAttackersWeight[Them]
- + 64 * kingAttacksCount[Them]
- + 183 * popcount(kingRing[Us] & weak)
- + 122 * popcount(pos.blockers_for_king(Us) | unsafeChecks)
- - 860 * !pos.count<QUEEN>(Them)
- - 7 * mg_value(score) / 8
- + 17 ;
+ + 69 * kingAttacksCount[Them]
+ + 185 * popcount(kingRing[Us] & weak)
+ + 129 * popcount(pos.blockers_for_king(Us) | unsafeChecks)
+ + 4 * tropism
+ - 873 * !pos.count<QUEEN>(Them)
+ - 6 * mg_value(score) / 8
+ - 30;
// Transform the kingDanger units into a Score, and subtract it from the evaluation
if (kingDanger > 0)
}
}
- Bitboard kf = KingFlank[file_of(ksq)];
-
// Penalty when our king is on a pawnless flank
- if (!(pos.pieces(PAWN) & kf))
+ if (!(pos.pieces(PAWN) & kingFlank))
score -= PawnlessFlank;
- // Find the squares that opponent attacks in our king flank, and the squares
- // which are attacked twice in that flank but not defended by our pawns.
- b1 = attackedBy[Them][ALL_PIECES] & kf & Camp;
- b2 = b1 & attackedBy2[Them] & ~attackedBy[Us][PAWN];
-
- // King tropism, to anticipate slow motion attacks on our king
- score -= CloseEnemies * (popcount(b1) + popcount(b2));
+ // King tropism bonus, to anticipate slow motion attacks on our king
+ score -= CloseEnemies * tropism;
if (T)
Trace::add(KING, Us, score);
constexpr Direction Up = (Us == WHITE ? NORTH : SOUTH);
constexpr Bitboard TRank3BB = (Us == WHITE ? Rank3BB : Rank6BB);
- Bitboard b, weak, defended, nonPawnEnemies, stronglyProtected, safeThreats;
+ Bitboard b, weak, defended, nonPawnEnemies, stronglyProtected, safe;
Score score = SCORE_ZERO;
// Non-pawn enemies
// Enemies not strongly protected and under our attack
weak = pos.pieces(Them) & ~stronglyProtected & attackedBy[Us][ALL_PIECES];
+ // Safe or protected squares
+ safe = ~attackedBy[Them][ALL_PIECES] | attackedBy[Us][ALL_PIECES];
+
// Bonus according to the kind of attacking pieces
if (defended | weak)
{
score += ThreatByMinor[type_of(pos.piece_on(s))];
if (type_of(pos.piece_on(s)) != PAWN)
score += ThreatByRank * (int)relative_rank(Them, s);
+
+ else if (pos.blockers_for_king(Them) & s)
+ score += ThreatByRank * (int)relative_rank(Them, s) / 2;
}
- b = (pos.pieces(Them, QUEEN) | weak) & attackedBy[Us][ROOK];
+ b = weak & attackedBy[Us][ROOK];
while (b)
{
Square s = pop_lsb(&b);
score += ThreatByRook[type_of(pos.piece_on(s))];
if (type_of(pos.piece_on(s)) != PAWN)
score += ThreatByRank * (int)relative_rank(Them, s);
+
+ else if (pos.blockers_for_king(Them) & s)
+ score += ThreatByRank * (int)relative_rank(Them, s) / 2;
}
- b = weak & attackedBy[Us][KING];
- if (b)
- score += ThreatByKing[more_than_one(b)];
+ if (weak & attackedBy[Us][KING])
+ score += ThreatByKing;
score += Hanging * popcount(weak & ~attackedBy[Them][ALL_PIECES]);
- // Bonus for overload (non-pawn enemies attacked and defended exactly once)
- b = nonPawnEnemies
- & attackedBy[Us][ALL_PIECES] & ~attackedBy2[Us]
- & attackedBy[Them][ALL_PIECES] & ~attackedBy2[Them];
+ b = weak & nonPawnEnemies & attackedBy[Them][ALL_PIECES];
score += Overload * popcount(b);
}
if (pos.pieces(Us, ROOK, QUEEN))
score += WeakUnopposedPawn * pe->weak_unopposed(Them);
- // Our safe or protected pawns
- b = pos.pieces(Us, PAWN)
- & (~attackedBy[Them][ALL_PIECES] | attackedBy[Us][ALL_PIECES]);
-
- safeThreats = pawn_attacks_bb<Us>(b) & nonPawnEnemies;
- score += ThreatBySafePawn * popcount(safeThreats);
-
// Find squares where our pawns can push on the next move
b = shift<Up>(pos.pieces(Us, PAWN)) & ~pos.pieces();
b |= shift<Up>(b & TRank3BB) & ~pos.pieces();
- // Keep only the squares which are not completely unsafe
- b &= ~attackedBy[Them][PAWN]
- & (attackedBy[Us][ALL_PIECES] | ~attackedBy[Them][ALL_PIECES]);
+ // Keep only the squares which are relatively safe
+ b &= ~attackedBy[Them][PAWN] & safe;
// Bonus for safe pawn threats on the next move
- b = pawn_attacks_bb<Us>(b)
- & pos.pieces(Them)
- & ~attackedBy[Us][PAWN];
-
+ b = pawn_attacks_bb<Us>(b) & pos.pieces(Them);
score += ThreatByPawnPush * popcount(b);
+ // Our safe or protected pawns
+ b = pos.pieces(Us, PAWN) & safe;
+
+ b = pawn_attacks_bb<Us>(b) & nonPawnEnemies;
+ score += ThreatBySafePawn * popcount(b);
+
// Bonus for threats on the next moves against enemy queen
if (pos.count<QUEEN>(Them) == 1)
{
Square s = pos.square<QUEEN>(Them);
- safeThreats = mobilityArea[Us] & ~stronglyProtected;
+ safe = mobilityArea[Us] & ~stronglyProtected;
b = attackedBy[Us][KNIGHT] & pos.attacks_from<KNIGHT>(s);
- score += KnightOnQueen * popcount(b & safeThreats);
+ score += KnightOnQueen * popcount(b & safe);
b = (attackedBy[Us][BISHOP] & pos.attacks_from<BISHOP>(s))
| (attackedBy[Us][ROOK ] & pos.attacks_from<ROOK >(s));
- score += SliderOnQueen * popcount(b & safeThreats & attackedBy2[Us]);
+ score += SliderOnQueen * popcount(b & safe & attackedBy2[Us]);
}
- // Connectivity: ensure that knights, bishops, rooks, and queens are protected
- b = (pos.pieces(Us) ^ pos.pieces(Us, PAWN, KING)) & attackedBy[Us][ALL_PIECES];
- score += Connectivity * popcount(b);
-
if (T)
Trace::add(THREAT, Us, score);
assert(!(pos.pieces(Them, PAWN) & forward_file_bb(Us, s + Up)));
- bb = forward_file_bb(Us, s) & pos.pieces(Them);
- score -= HinderPassedPawn * popcount(bb);
+ if (forward_file_bb(Us, s) & pos.pieces(Them))
+ score -= HinderPassedPawn;
int r = relative_rank(Us, s);
int w = PassedDanger[r];
template<Tracing T> template<Color Us>
Score Evaluation<T>::space() const {
+ if (pos.non_pawn_material() < SpaceThreshold)
+ return SCORE_ZERO;
+
constexpr Color Them = (Us == WHITE ? BLACK : WHITE);
constexpr Bitboard SpaceMask =
Us == WHITE ? CenterFiles & (Rank2BB | Rank3BB | Rank4BB)
: CenterFiles & (Rank7BB | Rank6BB | Rank5BB);
- if (pos.non_pawn_material() < SpaceThreshold)
- return SCORE_ZERO;
-
// Find the available squares for our pieces inside the area defined by SpaceMask
Bitboard safe = SpaceMask
& ~pos.pieces(Us, PAWN)
int outflanking = distance<File>(pos.square<KING>(WHITE), pos.square<KING>(BLACK))
- distance<Rank>(pos.square<KING>(WHITE), pos.square<KING>(BLACK));
- bool pawnsOnBothFlanks = (pos.pieces(PAWN) & QueenSide)
+ bool pawnsOnBothFlanks = (pos.pieces(PAWN) & QueenSide)
&& (pos.pieces(PAWN) & KingSide);
// Compute the initiative bonus for the attacking side
+ 12 * outflanking
+ 16 * pawnsOnBothFlanks
+ 48 * !pos.non_pawn_material()
- -136 ;
+ -118 ;
// Now apply the bonus: note that we find the attacking side by extracting
// the sign of the endgame value, and that we carefully cap the bonus so
projects / stockfish / blobdiff