Is there a hand that should be never split?

Yes, there is. Whenever you have a pair of 10’s in your hand, you should refrain from splitting it. Instead, you should simply stand, regardless of the up card of the dealer. The reason why is that by having such a hand, you are in a great position because you have an extremely strong total. In such cases, the odds are in your favor as a total of twenty can be hardly improved. In fact, you have a 90% chance of winning if you stand as usually, this total is completely sufficient to make you a winner.