Module: Checkers::Board::Score

Included in:
Checkers::Board
Defined in:
lib/checkers/board/score.rb

Instance Method Summary collapse

Instance Method Details

#movable_pieces(player:) ⇒ Object 



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# File 'lib/checkers/board/score.rb', line 47

def movable_pieces(player:)
  opponent = opponent(player)
  opponent_pieces = 0
  player_pieces = 0

  board.each_with_index do |piece, row, col|
    next if piece.zero?

    if player_pieces(player).include?(piece) && movable_squares(row: row, col: col, player: player).any?
      player_pieces += 1
    elsif movable_squares(row: row, col: col, player: opponent).any?
      opponent_pieces += 1
    end
  end

  opponent_pieces - player_pieces
end

#number_of_pieces(player:) ⇒ Object 



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# File 'lib/checkers/board/score.rb', line 6

def number_of_pieces(player:)
  opponent = opponent(player)
  player_pieces = board.count { |piece| player_pieces(player).include?(piece) }
  opponent_pieces = board.count { |piece| player_pieces(opponent).include?(piece) }
  opponent_pieces - player_pieces
end

#number_of_pieces_on_opponets_side(player:) ⇒ Object 



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# File 'lib/checkers/board/score.rb', line 13

def number_of_pieces_on_opponets_side(player:)
  opponent = opponent(player)

  player_pieces = board.each_with_index.count do |piece, row, _col|
    next if row >= 3

    player_pieces(player).include?(piece)
  end

  opponent_pieces = board.each_with_index.count do |piece, row, _col|
    next unless row == 5

    player_pieces(opponent).include?(piece)
  end

  opponent_pieces - player_pieces
end

#number_of_unoccupied_promotion_squares(player:) ⇒ Object

for kings implementation



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# File 'lib/checkers/board/score.rb', line 32

def number_of_unoccupied_promotion_squares(player:)
  opponent = opponent(player)
  opponent_squares = 0
  player_squares = 0

  board.each_with_index do |square, row, _col|
    next if player_pieces(player).include?(square) || player_pieces(opponent).include?(square)

    opponent_squares += 1 if row == 7
    player_squares += 1 if row.zero?
  end

  opponent_squares - player_squares
end