The option to run it twice occurs when everyone in the hand is all in. (It’s also possible to run it three, four, five, or as many times as cards left in the deck, but online play is limited only to twice.) You can only run it twice at a cash table. The pot is then split into two, half for the first set of community cards, and the other half for the second. Simply put, running it twice allows all-in players to see the remaining cards twice instead of once. However, that is changed because now anyone can choose to run it twice online at ACR Poker.
Running it twice has been around for years, but until recently, was only common at the highest stakes games in a B&M casino.
