295. There are two piles of balls on the table, with 30 balls in each pile. Two players take turns taking any number of balls from the table, but on one turn, from only one of the piles. The winner is the one who takes the last balls from the table. Who and how will win with the correct play?
$\triangle$ The second player wins by taking the same number of balls on each move as the player who starts, but from a different pile. For example, if the player who starts takes 5 balls from the first pile on their first move, the second player should take 5 balls from the second pile in response; if the first player takes, say, 8 balls from the second pile on their second move, the second player should take 8 balls from the first pile on the same move, and so on.

Answer: the second player.

In general, in game problems, it is often (but not always) advantageous to respond to the opponent's move with a symmetric move in some sense.