A and B play games. The turntable is divided into four squares, each with a coin. A can choose to flip two or one coin at a time, and then B can turn it over.

That's an interesting question, I think so.

Considering the symmetry of the turntable and the symmetry of the front and back of the coin, there are actually only four initial States of the game, as shown in the figure.

If it is in the state of 1, then A wins directly;

If it is state 2, then A can win by flipping the two opposite coins;

If it is in state 3, two coins adjacent to a flip may win directly or enter state 2, but the two coins opposite to a flip are still in state 3;

If it is in state 4, A may win by flipping a coin and turn it into state 2 or state 3, but the two opposite or adjacent to A will still stay in state 4.

Well, the state and the transformation law between them are clear, then A's strategy can be easily determined.

Step 1: Confirm whether you win or not, if yes, terminate, otherwise, enter the second step (non-status 1).

Step 2: flip two opposite coins to confirm whether they win, if so, stop, otherwise, enter the third step (non-state 2).

Step 3: flip the two adjacent ones to confirm whether they win, if so, stop, otherwise, go to step 4.

Step 4: flip two opposite coins to confirm whether they win, if so, stop, otherwise, enter step 5 (non-state 3).

Step 5: Flip a coin to confirm whether you win, if so, stop, otherwise go to step 6.

Step 6: flip two opposite coins to confirm whether you win, if so, stop, otherwise go to step 7.

Step 7: flip the two adjacent ones to confirm whether they win, if so, stop, otherwise, go to step 8.

Step 8: flip two opposite coins, and you win.