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LibChess+Chess: Ensure no pawns have moved when invoking 50 move rule
The 50 and 75 move rules are no longer invoked if a pawn has advanced in the last 50 or 75 moves respectively.
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2 changed files with 5 additions and 3 deletions
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@ -774,9 +774,11 @@ Board::Result Board::game_result() const
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});
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if (are_legal_moves) {
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if (m_moves_since_capture >= 75 * 2)
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if (m_moves_since_capture >= 75 * 2 && m_moves_since_pawn_advance >= 75 * 2)
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return Result::SeventyFiveMoveRule;
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if (m_moves_since_capture == 50 * 2)
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if ((m_moves_since_capture >= 50 * 2 && m_moves_since_pawn_advance == 50 * 2)
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|| (m_moves_since_pawn_advance >= 50 * 2 && m_moves_since_capture == 50 * 2))
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return Result::FiftyMoveRule;
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auto repeats = m_previous_states.get(Traits<Board>::hash(*this));
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