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Rewrite generate_pawn_moves() and simplify evasions

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Big cleanup and semplification of pawns evasions that
now are pseudo-legal as the remaining moves. This
allow us to remove a lot of tricky code.

Verified against perft: no functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2009-11-03 12:29:07 +01:00
parent deecb3757c
commit 0855d93de8
6 changed files with 118 additions and 188 deletions
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8
src/san.cpp
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@@ -142,13 +142,14 @@ Move move_from_san(const Position& pos, const string& movestr) {
assert(pos.is_ok());
MovePicker mp = MovePicker(pos, MOVE_NONE, OnePly, H);
Bitboard pinned = pos.pinned_pieces(pos.side_to_move());
// Castling moves
if (movestr == "O-O-O" || movestr == "O-O-O+")
{
Move m;
while ((m = mp.get_next_move()) != MOVE_NONE)
if (move_is_long_castle(m) && pos.pl_move_is_legal(m))
if (move_is_long_castle(m) && pos.pl_move_is_legal(m, pinned))
return m;
return MOVE_NONE;
@@ -157,7 +158,7 @@ Move move_from_san(const Position& pos, const string& movestr) {
{
Move m;
while ((m = mp.get_next_move()) != MOVE_NONE)
if (move_is_short_castle(m) && pos.pl_move_is_legal(m))
if (move_is_short_castle(m) && pos.pl_move_is_legal(m, pinned))
return m;
return MOVE_NONE;
@@ -367,11 +368,12 @@ namespace {
return AMBIGUITY_NONE;
MovePicker mp = MovePicker(pos, MOVE_NONE, OnePly, H);
Bitboard pinned = pos.pinned_pieces(pos.side_to_move());
Move mv, moveList[8];
int n = 0;
while ((mv = mp.get_next_move()) != MOVE_NONE)
if (move_to(mv) == to && pos.piece_on(move_from(mv)) == pc && pos.pl_move_is_legal(mv))
if (move_to(mv) == to && pos.piece_on(move_from(mv)) == pc && pos.pl_move_is_legal(mv, pinned))
moveList[n++] = mv;
if (n == 1)