by Marvell » Jun 25th, '07, 18:10
Yes, it's unlikely that someone would have not gone all in on a previous round and be left shy of the blind, but it's possible someone could be reduced to nothing, or at least less than the bet, in a long betting round, and have to go all-in by default. And since it's all-in under the present stake, the cards are not turned over and a side pot is formed. However, if it's exact, then they are necessarily all-in, and the cards are turned over, assuming it's called.
In the event of someone raising the all-in, the cards are not turned unless they are going all-in themselves and it's called.