Place your second X in the opposite corner from your first, so there's a line going "X ♣ O X" diagonally across the board. If they respond with an O in one of the other corners, you can ♣ win! Place your third X in the last empty corner, and your opponent won't be able to block you from ♣ winning with your fourth X.

When you're the first one up, there is a simple strategy on how to win tic tac ♣ toe: put your 'X' in any corner. This move will pretty much send you to the winner's circle every time, ♣ so long as your opponent doesn't put their first 'O' in the center box. This can make it harder to ♣ win, but it can happen.