Question about the half-bet minimum to reraise

[TomCowley]

All of the games around town use the rule that an all-in raise for less than half of the amount of the previous bet or raise doesn't count as a raise. So if I bet $100 on the flop, player B calls, and player C goes all in for $140 total, neither of us can reraise (we can just call $40 or fold). That's easy.

We had a related situation last night that I can't figure out.

preflop, UTG raised to $20. I reraised $100 more to a total of $120. CO went all in for $162 total, a $42 raise after my raise of $100. This is less than half of my raise, so it's clear that if it gets around to me, I can't reraise. However it was ruled that *UTG* couldn't reraise either, even though he hadn't yet acted on my $100 raise, because he had already acted in that betting round (but the button would have been able to raise since he hadn't acted in that round). Robert's Rules indicate that only the players who have acted on ALL OTHER BETS are restricted from reraising (they also say this rule is for limit, but whatever.. it can clearly be used in NL), and UTG hadn't acted on my bet.

It doesn't seem logical to me to prohibit UTG from reraising here, and I couldn't find any justification for it in a quick search online. Is this in fact a standard rule, and if it is, why is it this way?

[Lottery Larry]

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All of the games around town use the rule that an all-in raise for less than half of the amount of the previous bet or raise doesn't count as a raise. So if I bet $100 on the flop, player B calls, and player C goes all in for $140 total, neither of us can reraise (we can just call $40 or fold). That's easy.

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Is this a big-bet game? (NL/PL) If so, the half-bet raise rule is unusual. This is usually a LIMIT game rule.

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preflop, UTG raised to $20. I reraised $100 more to a total of $120. CO went all in for $162 total, a $42 raise after my raise of $100. This is less than half of my raise, so it's clear that if it gets around to me, I can't reraise.

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Good so far- betting is reopened for UTG, but not for you, unless UTG reraises to at least $170 (assuming an all-in)

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However it was ruled that *UTG* couldn't reraise either, even though he hadn't yet acted on my $100 raise, because he had already acted in that betting round (but the button would have been able to raise since he hadn't acted in that round). Robert's Rules indicate that only the players who have acted on ALL OTHER BETS are restricted from reraising (they also say this rule is for limit, but whatever.. it can clearly be used in NL), and UTG hadn't acted on my bet.

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BZZZZZ!!! Wrong answer, thanks for playing (whomever the floorperson was).

UTG's ability to raise was only affected by YOUR initial raise, not any other bet/reraise after that. UTG can reraise here. Someone screwed up.

This is true for limit, NL and whether you're using the half-bet or full-bet raise rule.

One KITN for the floor, please.

[PantsOnFire]

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All of the games around town use the rule that an all-in raise for less than half of the amount of the previous bet or raise doesn't count as a raise.

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Actaully, that is a rule in Limit Holdem. In NL, the all-in doesn't count as a raise even if it is one chip shy of a min-raise.

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Robert's Rules indicate that only the players who have acted on ALL OTHER BETS are restricted from reraising...

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The answer is right there. UTG has not acted on your raise to $100. He has the right to reraise here. Pretend CO had exactly $120 and he called your raise. Would UTG be able to reraise?

The bottom line is that when you bet and get raised, you always have a chance to respond.

[GiantBuddha]

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Actaully, that is a rule in Limit Holdem. In NL, the all-in doesn't count as a raise even if it is one chip shy of a min-raise.

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This is standard, but some places definitely count a half raise as an official raise in NL. Make sure you find out the rules of the club or casino you're playing in.