I believe it is not advisable to split 10s in blackjack, as a total of 20 is a strong hand. By splitting, you risk weakening your position and potentially ending up with two weaker hands. Most strategies suggest keeping the 20 and playing it as is, since it usually has a high chance of winning against the dealer's hand. However, some players may choose to split 10s in specific situations or for fun, but from a basic strategy standpoint, it's typically best to not split them.