namespace {
// Bonus for having the side to move (modified by Joona Kiiski)
- const Score TempoValue = make_score(48, 22);
+ const Score Tempo = make_score(48, 22);
// To convert a Piece to and from a FEN char
const string PieceToChar(" PNBRQK pnbrqk .");
st->key = compute_key();
st->pawnKey = compute_pawn_key();
st->materialKey = compute_material_key();
- st->value = compute_value();
+ st->psqScore = compute_psq_score();
st->npMaterial[WHITE] = compute_non_pawn_material(WHITE);
st->npMaterial[BLACK] = compute_non_pawn_material(BLACK);
st->checkersBB = attackers_to(king_square(sideToMove)) & pieces(~sideToMove);
{
sq = make_square(file, rank);
- if (square_is_empty(sq))
+ if (square_empty(sq))
emptyCnt++;
else
{
if (move)
{
- Position p(*this, thread());
+ Position p(*this, this_thread());
cout << "\nMove is: " << (sideToMove == BLACK ? ".." : "") << move_to_san(p, move);
}
while (pinners)
{
- b = squares_between(ksq, pop_1st_bit(&pinners)) & occupied_squares();
+ b = squares_between(ksq, pop_1st_bit(&pinners)) & pieces();
- // Only one bit set and is an our piece?
- if (b && !(b & (b - 1)) && (b & pieces(sideToMove)))
+ if (b && single_bit(b) && (b & pieces(sideToMove)))
result |= b;
}
return result;
Bitboard Position::attacks_from(Piece p, Square s, Bitboard occ) {
- assert(square_is_ok(s));
+ assert(is_ok(s));
switch (type_of(p))
{
bool Position::move_attacks_square(Move m, Square s) const {
assert(is_ok(m));
- assert(square_is_ok(s));
+ assert(is_ok(s));
Bitboard occ, xray;
Square from = from_sq(m);
Square to = to_sq(m);
Piece piece = piece_moved(m);
- assert(!square_is_empty(from));
+ assert(!square_empty(from));
// Update occupancy as if the piece is moving
- occ = occupied_squares() ^ from ^ to;
+ occ = pieces() ^ from ^ to;
// The piece moved in 'to' attacks the square 's' ?
if (attacks_from(piece, to, occ) & s)
Square to = to_sq(m);
Square capsq = to + pawn_push(them);
Square ksq = king_square(us);
- Bitboard b = (occupied_squares() ^ from ^ capsq) | to;
+ Bitboard b = (pieces() ^ from ^ capsq) | to;
assert(to == ep_square());
assert(piece_moved(m) == make_piece(us, PAWN));
case DELTA_N:
case DELTA_S:
// Pawn push. The destination square must be empty.
- if (!square_is_empty(to))
+ if (!square_empty(to))
return false;
break;
// rank, and both the destination square and the square between the
// source and destination squares must be empty.
if ( rank_of(to) != RANK_4
- || !square_is_empty(to)
- || !square_is_empty(from + DELTA_N))
+ || !square_empty(to)
+ || !square_empty(from + DELTA_N))
return false;
break;
// rank, and both the destination square and the square between the
// source and destination squares must be empty.
if ( rank_of(to) != RANK_5
- || !square_is_empty(to)
- || !square_is_empty(from + DELTA_S))
+ || !square_empty(to)
+ || !square_empty(from + DELTA_S))
return false;
break;
}
// In case of king moves under check we have to remove king so to catch
// as invalid moves like b1a1 when opposite queen is on c1.
- else if (attackers_to(to, occupied_squares() ^ from) & pieces(~us))
+ else if (attackers_to(to, pieces() ^ from) & pieces(~us))
return false;
}
// Promotion with check ?
if (is_promotion(m))
- return attacks_from(Piece(promotion_type(m)), to, occupied_squares() ^ from) & ksq;
+ return attacks_from(Piece(promotion_type(m)), to, pieces() ^ from) & ksq;
// En passant capture with check ? We have already handled the case
// of direct checks and ordinary discovered check, the only case we
if (is_enpassant(m))
{
Square capsq = make_square(file_of(to), rank_of(from));
- Bitboard b = (occupied_squares() ^ from ^ capsq) | to;
+ Bitboard b = (pieces() ^ from ^ capsq) | to;
return (attacks_bb< ROOK>(ksq, b) & pieces( ROOK, QUEEN, us))
| (attacks_bb<BISHOP>(ksq, b) & pieces(BISHOP, QUEEN, us));
Square rfrom = to; // 'King captures the rook' notation
Square kto = relative_square(us, rfrom > kfrom ? SQ_G1 : SQ_C1);
Square rto = relative_square(us, rfrom > kfrom ? SQ_F1 : SQ_D1);
- Bitboard b = (occupied_squares() ^ kfrom ^ rfrom) | rto | kto;
+ Bitboard b = (pieces() ^ kfrom ^ rfrom) | rto | kto;
return attacks_bb<ROOK>(rto, b) & ksq;
}
Key pawnKey, materialKey;
Value npMaterial[2];
int castleRights, rule50, pliesFromNull;
- Score value;
+ Score psq_score;
Square epSquare;
};
st->npMaterial[them] -= PieceValueMidgame[capture];
// Remove the captured piece
- byColorBB[them] ^= capsq;
+ byTypeBB[ALL_PIECES] ^= capsq;
byTypeBB[capture] ^= capsq;
- occupied ^= capsq;
+ byColorBB[them] ^= capsq;
// Update piece list, move the last piece at index[capsq] position and
// shrink the list.
st->materialKey ^= zobrist[them][capture][pieceCount[them][capture]];
// Update incremental scores
- st->value -= pst(make_piece(them, capture), capsq);
+ st->psqScore -= pieceSquareTable[make_piece(them, capture)][capsq];
// Reset rule 50 counter
st->rule50 = 0;
// Move the piece
Bitboard from_to_bb = SquareBB[from] | SquareBB[to];
- byColorBB[us] ^= from_to_bb;
+ byTypeBB[ALL_PIECES] ^= from_to_bb;
byTypeBB[pt] ^= from_to_bb;
- occupied ^= from_to_bb;
+ byColorBB[us] ^= from_to_bb;
board[to] = board[from];
board[from] = NO_PIECE;
^ zobrist[us][PAWN][pieceCount[us][PAWN]];
// Update incremental score
- st->value += pst(make_piece(us, promotion), to)
- - pst(make_piece(us, PAWN), to);
+ st->psqScore += pieceSquareTable[make_piece(us, promotion)][to]
+ - pieceSquareTable[make_piece(us, PAWN)][to];
// Update material
st->npMaterial[us] += PieceValueMidgame[promotion];
}
// Prefetch pawn and material hash tables
- Threads[threadID].pawnTable.prefetch(st->pawnKey);
- Threads[threadID].materialTable.prefetch(st->materialKey);
+ prefetch((char*)Threads[threadID].pawnTable.entries[st->pawnKey]);
+ prefetch((char*)Threads[threadID].materialTable.entries[st->materialKey]);
// Update incremental scores
- st->value += pst_delta(piece, from, to);
+ st->psqScore += psq_delta(piece, from, to);
// Set capture piece
st->capturedType = capture;
// Finish
sideToMove = ~sideToMove;
- st->value += (sideToMove == WHITE ? TempoValue : -TempoValue);
+ st->psqScore += (sideToMove == WHITE ? Tempo : -Tempo);
assert(pos_is_ok());
}
PieceType pt = type_of(piece);
PieceType capture = st->capturedType;
- assert(square_is_empty(from));
+ assert(square_empty(from));
assert(color_of(piece) == us);
assert(capture != KING);
// Put the piece back at the source square
Bitboard from_to_bb = SquareBB[from] | SquareBB[to];
- byColorBB[us] ^= from_to_bb;
+ byTypeBB[ALL_PIECES] ^= from_to_bb;
byTypeBB[pt] ^= from_to_bb;
- occupied ^= from_to_bb;
+ byColorBB[us] ^= from_to_bb;
board[from] = board[to];
board[to] = NO_PIECE;
}
// Restore the captured piece
- byColorBB[them] |= capsq;
+ byTypeBB[ALL_PIECES] |= capsq;
byTypeBB[capture] |= capsq;
- occupied |= capsq;
+ byColorBB[them] |= capsq;
board[capsq] = make_piece(them, capture);
assert(piece_on(rfrom) == make_piece(us, ROOK));
// Remove pieces from source squares
- byColorBB[us] ^= kfrom;
+ byTypeBB[ALL_PIECES] ^= kfrom;
byTypeBB[KING] ^= kfrom;
- occupied ^= kfrom;
- byColorBB[us] ^= rfrom;
+ byColorBB[us] ^= kfrom;
+ byTypeBB[ALL_PIECES] ^= rfrom;
byTypeBB[ROOK] ^= rfrom;
- occupied ^= rfrom;
+ byColorBB[us] ^= rfrom;
// Put pieces on destination squares
- byColorBB[us] |= kto;
+ byTypeBB[ALL_PIECES] |= kto;
byTypeBB[KING] |= kto;
- occupied |= kto;
- byColorBB[us] |= rto;
+ byColorBB[us] |= kto;
+ byTypeBB[ALL_PIECES] |= rto;
byTypeBB[ROOK] |= rto;
- occupied |= rto;
+ byColorBB[us] |= rto;
// Update board
Piece king = make_piece(us, KING);
st->capturedType = NO_PIECE_TYPE;
// Update incremental scores
- st->value += pst_delta(king, kfrom, kto);
- st->value += pst_delta(rook, rfrom, rto);
+ st->psqScore += psq_delta(king, kfrom, kto);
+ st->psqScore += psq_delta(rook, rfrom, rto);
// Update hash key
st->key ^= zobrist[us][KING][kfrom] ^ zobrist[us][KING][kto];
// Finish
sideToMove = ~sideToMove;
- st->value += (sideToMove == WHITE ? TempoValue : -TempoValue);
+ st->psqScore += (sideToMove == WHITE ? Tempo : -Tempo);
}
else
// Undo: point our state pointer back to the previous state
dst->key = src->key;
dst->epSquare = src->epSquare;
- dst->value = src->value;
+ dst->psqScore = src->psqScore;
dst->rule50 = src->rule50;
dst->pliesFromNull = src->pliesFromNull;
st->epSquare = SQ_NONE;
st->rule50++;
st->pliesFromNull = 0;
- st->value += (sideToMove == WHITE) ? TempoValue : -TempoValue;
+ st->psqScore += (sideToMove == WHITE ? Tempo : -Tempo);
}
assert(pos_is_ok());
from = from_sq(m);
to = to_sq(m);
capturedType = type_of(piece_on(to));
- occ = occupied_squares();
+ occ = pieces();
// Handle en passant moves
if (is_enpassant(m))
index[s] = pieceCount[c][pt]++;
pieceList[c][pt][index[s]] = s;
+ byTypeBB[ALL_PIECES] |= s;
byTypeBB[pt] |= s;
byColorBB[c] |= s;
- occupied |= s;
}
Key result = zobCastle[st->castleRights];
for (Square s = SQ_A1; s <= SQ_H8; s++)
- if (!square_is_empty(s))
+ if (!square_empty(s))
result ^= zobrist[color_of(piece_on(s))][type_of(piece_on(s))][s];
if (ep_square() != SQ_NONE)
}
-/// Position::compute_value() compute the incremental scores for the middle
+/// Position::compute_psq_score() computes the incremental scores for the middle
/// game and the endgame. These functions are used to initialize the incremental
/// scores when a new position is set up, and to verify that the scores are correctly
/// updated by do_move and undo_move when the program is running in debug mode.
-Score Position::compute_value() const {
+Score Position::compute_psq_score() const {
Bitboard b;
Score result = SCORE_ZERO;
{
b = pieces(pt, c);
while (b)
- result += pst(make_piece(c, pt), pop_1st_bit(&b));
+ result += pieceSquareTable[make_piece(c, pt)][pop_1st_bit(&b)];
}
- result += (sideToMove == WHITE ? TempoValue / 2 : -TempoValue / 2);
+ result += (sideToMove == WHITE ? Tempo / 2 : -Tempo / 2);
return result;
}
Bitboard b = cr;
while (b)
{
- Key k = zobCastle[1 << pop_1st_bit(&b)];
+ Key k = zobCastle[1ULL << pop_1st_bit(&b)];
zobCastle[cr] ^= k ? k : rk.rand<Key>();
}
}
}
-/// Position::flip_me() flips position with the white and black sides reversed. This
+/// Position::flip() flips position with the white and black sides reversed. This
/// is only useful for debugging especially for finding evaluation symmetry bugs.
-void Position::flip_me() {
+void Position::flip() {
// Make a copy of current position before to start changing
const Position pos(*this, threadID);
clear();
- threadID = pos.thread();
+ threadID = pos.this_thread();
// Board
for (Square s = SQ_A1; s <= SQ_H8; s++)
- if (!pos.square_is_empty(s))
+ if (!pos.square_empty(s))
put_piece(Piece(pos.piece_on(s) ^ 8), ~s);
// Side to move
st->materialKey = compute_material_key();
// Incremental scores
- st->value = compute_value();
+ st->psqScore = compute_psq_score();
// Material
st->npMaterial[WHITE] = compute_non_pawn_material(WHITE);
// The union of the white and black pieces must be equal to all
// occupied squares
- if ((pieces(WHITE) | pieces(BLACK)) != occupied_squares())
+ if ((pieces(WHITE) | pieces(BLACK)) != pieces())
return false;
// Separate piece type bitboards must have empty intersections
// Incremental eval OK?
if (failedStep) (*failedStep)++;
- if (debugIncrementalEval && st->value != compute_value())
+ if (debugIncrementalEval && st->psqScore != compute_psq_score())
return false;
// Non-pawn material OK?
projects / stockfish / blobdiff