Module: Chess::WinAndDraw

Included in:
Game
Defined in:
lib/chess/game/win_and_draw.rb

Overview

WinAndDraw

Instance Method Summary collapse

Instance Method Details

check if any legal move available

Parameters:

Returns:

  • (Boolean) 


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# File 'lib/chess/game/win_and_draw.rb', line 63

def any_legal_move?(board)
  pieces = if board.current_player == 'w'
             board.white_pieces
           else
             board.black_pieces
           end
  total_moves = []
  pieces.each do |piece|
    total_moves += valid_moves(piece, board)
  end
  total_moves != []
end

#checkmate?(board) ⇒ Boolean

check if player is in checkmate

Parameters:

Returns:

  • (Boolean) 


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# File 'lib/chess/game/win_and_draw.rb', line 31

def checkmate?(board)
  in_check = if board.current_player == 'w'
               board.white_king.in_check
             else
               board.black_king.in_check
             end
  return false unless in_check

  return false if any_legal_move?(board)

  true
end

#detect_win_or_draws(board) ⇒ nil, Integer

detects wins or draws and exits the game

Parameters:

Returns:

  • (nil, Integer) —

    nil or Exit Code 0



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# File 'lib/chess/game/win_and_draw.rb', line 11

def detect_win_or_draws(board) # rubocop:disable Metrics/MethodLength
  if checkmate?(board)
    puts 'Checkmate!'
    return game_exit
  end

  if stalemate?(board)
    puts 'Stalemate!'
    return game_exit
  end

  return unless fifty_move_draw?(board)

  puts 'draw'
  game_exit
end

#fifty_move_draw?(board) ⇒ Boolean

check if there’s a fifty_move draw (100 half moves)

Parameters:

Returns:

  • (Boolean) 


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# File 'lib/chess/game/win_and_draw.rb', line 79

def fifty_move_draw?(board)
  board.half_move >= 100
end

#game_exit ⇒ Integer

exits the game

Returns:

  • (Integer) —

    Exit Code 0



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# File 'lib/chess/game/win_and_draw.rb', line 94

def game_exit
  pp 'exiting...'
  0
end

#save_and_exit(board) ⇒ Integer

save and exit the game

Returns:

  • (Integer) —

    Exit Code 0



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# File 'lib/chess/game/win_and_draw.rb', line 101

def save_and_exit(board)
  save_game(board)
  game_exit
end

#save_game(board) ⇒ Object

save the game

Parameters:



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# File 'lib/chess/game/win_and_draw.rb', line 86

def save_game(board)
  save_name = prompt_save_name
  fen = generate_fen_code(board)
  save(save_name, fen)
end

#stalemate?(board) ⇒ Boolean

check if player is in stalemate

Parameters:

Returns:

  • (Boolean) 


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# File 'lib/chess/game/win_and_draw.rb', line 47

def stalemate?(board)
  in_check = if board.current_player == 'w'
               board.white_king.in_check
             else
               board.black_king.in_check
             end
  return false if in_check

  return false if any_legal_move?(board)

  true
end