# This code iterates through all of the current player's uncaptured pieces to ensure that
  # at least one has a legal next move (regular move or capture) that resolves check if necessary.
  # Each piece is temporarily moved to each square (and any captured pieces are temporarily
  # captured) while check state is examined. At the end of the loop, all pieces are returned to
  # their original positions.

  def no_legal_next_move?
    friendly_pieces = pieces.where(color: player_turn, captured: false)
    friendly_pieces.each do |piece|
      (1..8).each do |x|
        (1..8).each do |y|
          if piece.valid_move?(x, y)
            original_x = piece.x_position
            original_y = piece.y_position
            captured_piece = pieces.find_by(x_position: x, y_position: y)
            begin
              captured_piece.update(x_position: -1, y_position: -1) if captured_piece
              piece.update(x_position: x, y_position: y)
              reload
              check_state = check
            ensure
              piece.update(x_position: original_x, y_position: original_y)
              captured_piece.update(x_position: x, y_position: y) if captured_piece
              reload
            end
            if check_state.nil?
              return false
            end
          end
        end
      end
    end
    true
  end