Definition of HU

There are also heads-up tournaments. These tournaments are shootouts. Once you have beaten an opponent, you are paired with another opponent, until only one player remains, the winner of the tournament. This is also known as heads-up play in sit'n'gos and tournaments. When there are only two players left in a tournament or sit'n'go, the tournament is called heads-up. This is an intense moment in the tournament because the first place payout in tournaments is often much bigger than the second place payout.

HU (Heads-up)