You play South. Partner (North) is played by the computer using ACOL rules. West may double or overcall your opening if their hand qualifies, and North will respond to that interference accordingly.

Open your hand, then respond to partner's bids to reach a contract. Once West has intervened, your rebid isn't marked right or wrong — bid your best shot and the auction will continue.

At the end, Double Dummy analysis shows how many tricks are available with best play on both sides.