ur.py

# import pygame
import random

def get_moves(player, opponent, speed):
	if speed == 0: # No move that can be made will have any effect, so why allow any?
		return []
	
	valids = []
	
	# Get a piece.
	for i in range(6):
		# Check the validity of the spot it would go to.
		if player[i] + speed <= 15 and player[i] + speed not in player:
				if player[i] + speed in opponent:
					if player[i] == 8: # Is the contested position the the shared rosetta?
						valids.append([i, opponent.index(player[i])]) # Add legal move to list.
				else:

					valids.append([i, None])
	
	return valids

def choose_move(choices):
	while True:
		try:
			choice = int(input("Which move will you make? [0, " + str(choices) + "]: "))
			if 0 <= choice <= choices:
				return choice
			raise
		except:
			print("Invalid input. Must be an integer within [0, " + str(choices) + "]")

board = [[0, 0, 0, 0, 0, 0], [0, 0, 0, 0, 0, 0]]

# True = White
# False = Black
# None = Game over
turn = True

while turn is not None:
	roll = random.randint(0, 4)
	print(turn, board[True], board[False], roll)
	if turn:
		moves = get_moves(board[True], board[False], roll)
		print(moves)
		if len(moves) == 0:
			print("White cannot move...")
		elif len(moves) == 1:
			print("White only has one valid move.")
			board[True][moves[0][0]] += roll
			if moves[0][1] is not None:
				board[False][moves[0][1]] = 0
		else:
			print("White must choose a piece to move.")
			move = choose_move(len(moves))
			board[True][moves[move][0]] += roll
			if moves[move][1] is not None:
				board[False][moves[move][1]] = 0
	else:
		moves = get_moves(board[True], board[False], roll)
		print(moves)
		if len(moves) == 0:
			print("Black cannot move...")
		elif len(moves) == 1:
			print("Black only has one valid move.")
			board[False][moves[0][0]] += roll
			if moves[0][1] is not None:
				board[True][moves[0][1]] = 0
		else:
			print("Black must choose a piece to move.")
			move = choose_move(len(moves))
			board[False][moves[move][0]] += roll
			if moves[move][1] is not None:
				board[True][moves[move][1]] = 0
	if all(piece == 15 for piece in board[True]):
		turn = None
		print("White wins!")
	elif all(piece == 15 for piece in board[False]):
		turn = None
		print("Black wins!")
	else:
		turn = not turn # Swap turns.