Instant tournaments are on-demand and combine the best of a tournament and a single-player game. You're dealt deals from a previous tournament and your scores are then compared against 14 random competitors who played in that tournament. After each board, you get to know your final score for that board and your current rank in the tournament. Do well and you'll win ACBL Masterpoints®.
Click ACBL World then click on ACBL Instant Tournament then select the ACBL Instant Tournament of your choice.
Each tournament is 12 boards long and you must complete all 12 boards to be included on the leaderboard. There is no time limit for the tournament. However, if you're idle for a long time, you'll be disconnected from BBO and the game may be forfeited.
Games are "Best Hand": you will always have as many or more HCP than the next best hand. It's also "Human Declares", meaning that when your robot partner wins the contract, you will play it.