/*
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
- Copyright (C) 2004-2021 The Stockfish developers (see AUTHORS file)
+ Copyright (C) 2004-2023 The Stockfish developers (see AUTHORS file)
Stockfish is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
+#include "movegen.h"
+
#include <cassert>
+#include <initializer_list>
-#include "movegen.h"
+#include "bitboard.h"
#include "position.h"
namespace Stockfish {
namespace {
- template<GenType Type, Direction D>
- ExtMove* make_promotions(ExtMove* moveList, Square to, Square ksq) {
+ template<GenType Type, Direction D, bool Enemy>
+ ExtMove* make_promotions(ExtMove* moveList, [[maybe_unused]] Square to) {
- if (Type == CAPTURES || Type == EVASIONS || Type == NON_EVASIONS)
+ if constexpr (Type == CAPTURES || Type == EVASIONS || Type == NON_EVASIONS)
{
*moveList++ = make<PROMOTION>(to - D, to, QUEEN);
- if (attacks_bb<KNIGHT>(to) & ksq)
+ if constexpr (Enemy && Type == CAPTURES)
+ {
+ *moveList++ = make<PROMOTION>(to - D, to, ROOK);
+ *moveList++ = make<PROMOTION>(to - D, to, BISHOP);
*moveList++ = make<PROMOTION>(to - D, to, KNIGHT);
+ }
}
- if (Type == QUIETS || Type == EVASIONS || Type == NON_EVASIONS)
+ if constexpr ((Type == QUIETS && !Enemy) || Type == EVASIONS || Type == NON_EVASIONS)
{
*moveList++ = make<PROMOTION>(to - D, to, ROOK);
*moveList++ = make<PROMOTION>(to - D, to, BISHOP);
- if (!(attacks_bb<KNIGHT>(to) & ksq))
- *moveList++ = make<PROMOTION>(to - D, to, KNIGHT);
+ *moveList++ = make<PROMOTION>(to - D, to, KNIGHT);
}
return moveList;
constexpr Direction UpRight = (Us == WHITE ? NORTH_EAST : SOUTH_WEST);
constexpr Direction UpLeft = (Us == WHITE ? NORTH_WEST : SOUTH_EAST);
- const Square ksq = pos.square<KING>(Them);
- Bitboard emptySquares;
+ const Bitboard emptySquares = ~pos.pieces();
+ const Bitboard enemies = Type == EVASIONS ? pos.checkers()
+ : pos.pieces(Them);
Bitboard pawnsOn7 = pos.pieces(Us, PAWN) & TRank7BB;
Bitboard pawnsNotOn7 = pos.pieces(Us, PAWN) & ~TRank7BB;
- Bitboard enemies = (Type == EVASIONS ? pos.checkers():
- Type == CAPTURES ? target : pos.pieces(Them));
-
// Single and double pawn pushes, no promotions
- if (Type != CAPTURES)
+ if constexpr (Type != CAPTURES)
{
- emptySquares = (Type == QUIETS || Type == QUIET_CHECKS ? target : ~pos.pieces());
-
Bitboard b1 = shift<Up>(pawnsNotOn7) & emptySquares;
Bitboard b2 = shift<Up>(b1 & TRank3BB) & emptySquares;
- if (Type == EVASIONS) // Consider only blocking squares
+ if constexpr (Type == EVASIONS) // Consider only blocking squares
{
b1 &= target;
b2 &= target;
}
- if (Type == QUIET_CHECKS)
+ if constexpr (Type == QUIET_CHECKS)
{
- b1 &= pawn_attacks_bb(Them, ksq);
- b2 &= pawn_attacks_bb(Them, ksq);
-
- // Add pawn pushes which give discovered check. This is possible only
- // if the pawn is not on the same file as the enemy king, because we
- // don't generate captures. Note that a possible discovered check
- // promotion has been already generated amongst the captures.
- Bitboard dcCandidateQuiets = pos.blockers_for_king(Them) & pawnsNotOn7;
- if (dcCandidateQuiets)
- {
- Bitboard dc1 = shift<Up>(dcCandidateQuiets) & emptySquares & ~file_bb(ksq);
- Bitboard dc2 = shift<Up>(dc1 & TRank3BB) & emptySquares;
-
- b1 |= dc1;
- b2 |= dc2;
- }
+ // To make a quiet check, you either make a direct check by pushing a pawn
+ // or push a blocker pawn that is not on the same file as the enemy king.
+ // Discovered check promotion has been already generated amongst the captures.
+ Square ksq = pos.square<KING>(Them);
+ Bitboard dcCandidatePawns = pos.blockers_for_king(Them) & ~file_bb(ksq);
+ b1 &= pawn_attacks_bb(Them, ksq) | shift< Up>(dcCandidatePawns);
+ b2 &= pawn_attacks_bb(Them, ksq) | shift<Up+Up>(dcCandidatePawns);
}
while (b1)
// Promotions and underpromotions
if (pawnsOn7)
{
- if (Type == CAPTURES)
- emptySquares = ~pos.pieces();
-
- if (Type == EVASIONS)
- emptySquares &= target;
-
Bitboard b1 = shift<UpRight>(pawnsOn7) & enemies;
Bitboard b2 = shift<UpLeft >(pawnsOn7) & enemies;
Bitboard b3 = shift<Up >(pawnsOn7) & emptySquares;
+ if constexpr (Type == EVASIONS)
+ b3 &= target;
+
while (b1)
- moveList = make_promotions<Type, UpRight>(moveList, pop_lsb(b1), ksq);
+ moveList = make_promotions<Type, UpRight, true>(moveList, pop_lsb(b1));
while (b2)
- moveList = make_promotions<Type, UpLeft >(moveList, pop_lsb(b2), ksq);
+ moveList = make_promotions<Type, UpLeft, true>(moveList, pop_lsb(b2));
while (b3)
- moveList = make_promotions<Type, Up >(moveList, pop_lsb(b3), ksq);
+ moveList = make_promotions<Type, Up, false>(moveList, pop_lsb(b3));
}
// Standard and en passant captures
- if (Type == CAPTURES || Type == EVASIONS || Type == NON_EVASIONS)
+ if constexpr (Type == CAPTURES || Type == EVASIONS || Type == NON_EVASIONS)
{
Bitboard b1 = shift<UpRight>(pawnsNotOn7) & enemies;
Bitboard b2 = shift<UpLeft >(pawnsNotOn7) & enemies;
while (bb)
{
Square from = pop_lsb(bb);
-
Bitboard b = attacks_bb<Pt>(from, pos.pieces()) & target;
+
+ // To check, you either move freely a blocker or make a direct check.
if (Checks && (Pt == QUEEN || !(pos.blockers_for_king(~Us) & from)))
b &= pos.check_squares(Pt);
constexpr bool Checks = Type == QUIET_CHECKS; // Reduce template instantiations
const Square ksq = pos.square<KING>(Us);
Bitboard target;
-
- if (Type == EVASIONS && more_than_one(pos.checkers()))
- goto kingMoves; // Double check, only a king move can save the day
- switch (Type)
+ // Skip generating non-king moves when in double check
+ if (Type != EVASIONS || !more_than_one(pos.checkers()))
{
- case CAPTURES:
- target = pos.pieces(~Us);
- break;
- case QUIETS:
- case QUIET_CHECKS:
- target = ~pos.pieces();
- break;
- case EVASIONS:
- target = between_bb(ksq, lsb(pos.checkers()));
- break;
- case NON_EVASIONS:
- target = ~pos.pieces(Us);
- break;
+ target = Type == EVASIONS ? between_bb(ksq, lsb(pos.checkers()))
+ : Type == NON_EVASIONS ? ~pos.pieces( Us)
+ : Type == CAPTURES ? pos.pieces(~Us)
+ : ~pos.pieces( ); // QUIETS || QUIET_CHECKS
+
+ moveList = generate_pawn_moves<Us, Type>(pos, moveList, target);
+ moveList = generate_moves<Us, KNIGHT, Checks>(pos, moveList, target);
+ moveList = generate_moves<Us, BISHOP, Checks>(pos, moveList, target);
+ moveList = generate_moves<Us, ROOK, Checks>(pos, moveList, target);
+ moveList = generate_moves<Us, QUEEN, Checks>(pos, moveList, target);
}
- moveList = generate_pawn_moves<Us, Type>(pos, moveList, target);
- moveList = generate_moves<Us, KNIGHT, Checks>(pos, moveList, target);
- moveList = generate_moves<Us, BISHOP, Checks>(pos, moveList, target);
- moveList = generate_moves<Us, ROOK, Checks>(pos, moveList, target);
- moveList = generate_moves<Us, QUEEN, Checks>(pos, moveList, target);
-
-kingMoves:
if (!Checks || pos.blockers_for_king(~Us) & ksq)
{
Bitboard b = attacks_bb<KING>(ksq) & (Type == EVASIONS ? ~pos.pieces(Us) : target);
} // namespace
-/// <CAPTURES> Generates all pseudo-legal captures plus queen and checking knight promotions
-/// <QUIETS> Generates all pseudo-legal non-captures and underpromotions (except checking knight)
-/// <EVASIONS> Generates all pseudo-legal check evasions when the side to move is in check
-/// <QUIET_CHECKS> Generates all pseudo-legal non-captures giving check, except castling
-/// <NON_EVASIONS> Generates all pseudo-legal captures and non-captures
-///
-/// Returns a pointer to the end of the move list.
+// <CAPTURES> Generates all pseudo-legal captures plus queen promotions
+// <QUIETS> Generates all pseudo-legal non-captures and underpromotions
+// <EVASIONS> Generates all pseudo-legal check evasions
+// <NON_EVASIONS> Generates all pseudo-legal captures and non-captures
+// <QUIET_CHECKS> Generates all pseudo-legal non-captures giving check,
+// except castling and promotions
+//
+// Returns a pointer to the end of the move list.
template<GenType Type>
ExtMove* generate(const Position& pos, ExtMove* moveList) {
static_assert(Type != LEGAL, "Unsupported type in generate()");
- assert((Type == EVASIONS) == (bool)pos.checkers());
+ assert((Type == EVASIONS) == bool(pos.checkers()));
Color us = pos.side_to_move();
template ExtMove* generate<NON_EVASIONS>(const Position&, ExtMove*);
-/// generate<LEGAL> generates all the legal moves in the given position
+// generate<LEGAL> generates all the legal moves in the given position
template<>
ExtMove* generate<LEGAL>(const Position& pos, ExtMove* moveList) {
moveList = pos.checkers() ? generate<EVASIONS >(pos, moveList)
: generate<NON_EVASIONS>(pos, moveList);
while (cur != moveList)
- if ( ((pinned && pinned & from_sq(*cur)) || from_sq(*cur) == ksq || type_of(*cur) == EN_PASSANT)
+ if ( ((pinned & from_sq(*cur)) || from_sq(*cur) == ksq || type_of(*cur) == EN_PASSANT)
&& !pos.legal(*cur))
*cur = (--moveList)->move;
else
projects / stockfish / blobdiff