Page "Betting in poker" Paragraph 45

: For example, with the full bet rule in effect, a player opens the betting round for $ 20, and the next player has a total stake of $ 30.

He may raise to $ 30, declaring himself all in, but this does not constitute a " real " raise, in the following sense: if a third player now calls the $ 30, and the first player's turn to act comes up, he may now call the additional $ 10, but he does not have the right to re-raise further.

The all-in player's pseudo-raise was really just a call with some extra money, and the third player's call was just a call, so the initial opener's bet was simply called by both remaining players, closing the betting round ( even though he must still equalize the money by putting in the additional $ 10 ).

If the half bet rule were being used, then that raise would count as a genuine raise and the first player would be entitled to re-raise if he chose to ( creating a side pot for the amount of his re-raise and the third player's call, if any ).