Python gameboard class

import copy
 
class GameBoard:
	number_of_rows = 3
	rows = []
	global random_puzzle
 
	def __getstate__(self): 
		return self.rows
 
	def __setstate__(self, rows): 
		self.rows = rows	
 
	def __init__(self):
		return
 
	def getgameboard(self):
		return self.rows
 
	def perform(self, move):
		self.rows.append(move)
		return
 
	def legalmoves(self):
		return ['a1', 'a2', 'a3']
 
seq = 1
gb = GameBoard()
moves = []
while seq < 4:
	possibilities = gb.legalmoves()
	gb.perform(possibilities[0])
	moves.append(copy.deepcopy(gb))
	seq = seq + 1
 
for move in moves:
	print move.getgameboard()