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Fix bug in move_is_pseudolegal #18

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Merged
Aryan1508 merged 1 commit into from
May 29, 2021
Merged

Fix bug in move_is_pseudolegal #18

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14 changes: 14 additions & 0 deletions Bit-Genie/src/position.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -670,6 +670,20 @@ bool Position::move_is_pseudolegal(Move move)
Rank start_rank = side == White ? Rank::two : Rank::seven;
Direction forward = side == White ? Direction::north : Direction::south;
Square forward_sq = from + forward;
uint64_t prom_rank = side == White ? BitMask::rank7 : BitMask::rank2;
uint64_t from_sq_bb = 1ull << from;

if (flag == MoveFlag::promotion)
{
if ((prom_rank & from_sq_bb) == 0)
return false;
}

if (from_sq_bb & prom_rank)
{
if (flag != MoveFlag::promotion)
return false;
}

// Normal and promotions
if (flag == MoveFlag::normal || flag == MoveFlag::promotion)
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