In blackjack, it is generally frowned upon to split a nine. This is because the house edge on nine-deck blackjack is 0.77%. This means that for every 10 hands played, the house will win 7.
7 hands and lose 2.3 hands. In other words, splitting a nine increases your expected loss by almost 3%. Therefore, if you are playing for money, it is generally best to avoid splitting a nine. .
However, there are some exceptions to this rule. If you are playing for fun or to improve your skills, then it may be worth splitting a nine in order to reduce your chances of losing money.
However, before you do this, make sure that you understand the risks involved and that you are comfortable with them.
