def performanceSystem(first_strategy, board=None,
second_strategy=DEFAULT_STRATEGY):
if not board:
board = GameBoard()
i = len(board.trace)
while not board.gameEnded():
player, strategy = GameBoard.X, second_strategy
if i % 2:
player, strategy = GameBoard.O, first_strategy
x, y = board.chooseMove(strategy, player)
board.addMove(player, x, y)
i += 1
