Fra pokerTDA:
Rule 44: Re-opening the bet.
Example 1. Series of short all-in wagers that add up to a full raise and thus re-open betting:
NLHE, Blinds 50-100. Postflop, A opens betting for the 100 minimum.
B goes all in for a total of 125. C calls the 125,
D goes all in for 200 total and E calls 200.
Action returns to A who is facing a total raise of 100. Since 100 is a
full raise, the betting is re-opened for A who can fold, call, or raise
here. Note that neither B’s increment of 25 or D’s increment of 75 is
by itself a full raise, but when added together they total a full raise
and thus re-open the betting to “a player who is facing at least a full
raise when the action returns”.
Example 1-A:
At the end of Example 1 above, A smooth calls the 200 total (another
100 to him). The bet is now on C who is only facing a 75 increment. C
called the 125 previously and is now facing 200 total (a 75 increment).
Because 75 is not a full raise, the betting for C is not re-opened and C
can either put out an additional 75 or fold, he cannot raise.
Example 1-B:
At the end of Example 1 above, A raises the minimum (100), and makes it
300 total to C. C already has called 125 so it’s an additional 175 for C
to call. 175 is more than a full raise. Since C already acted and is
“now facing at least a full raise”, the betting is re-opened to C who
can fold, call, or re-raise here.
Example 2. Short all-in, 2 scenarios.
NLHE, Blinds 2000-4000. Pre-flop A calls the BB and puts out 4000. B
folds and C pushes all-in for 7500 total (an increment of 3500 above the
4000 BB). It’s folded around to the SB who also folds.
Example 2-A.
It’s 3500 more to the BB who has not yet acted on his option. The BB
can fold, smooth call the 3500, or raise by at least 4000 for a total of
11,500. The BB smooth calls and it’s 3500 more to A. A has already
acted and is facing 3500 which is not a full raise. Therefore A can only
fold or call the 3500, he cannot raise because it is not “at least a
full bet when the action returns to him”.
Example 2-B.
The BB raises the minimum (4000), for a total of 11500. It is now 7500
to A and because 7500 is more than a full minimum raise, betting is now
re-opened for A who can fold, call, or re-raise.