TDA rules are:
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B: A player undercalls by declaring or pushing out less than the call amount without first declaring “call”. An undercall is a mandatory full call if made in turn facing 1) any bet heads-up or 2) the opening bet on any round multi-way. In other situations, TD’s discretion applies. The opening bet is the first chip bet of each betting round (not a check). In blind games the posted BB is the pre-flop opener. All-in buttons reduce undercall frequency (See Recommended Procedure 1). This rule governs when players must make a full call and when, at TDs discretion they may forfeit an undercall and fold. For underbets and underraises, see Rule 43.
C: If two or more undercalls occur in sequence, play backs up to the first undercaller who must correct his or her bet per Rule 42-B. The TD will determine how to treat hands of the remaining bettors based on the circumstances.
Section B does not mention anything about action after an undercall. Section C indicates that it is possible to unwind successive undercalls at least, but this is not exactly relevant to an undercall followed by a raise.
Either way, Section B does not obligate the TD to allow the player to forfeit his undercall and fold, merely provides the option. So even if the player behind hadn't raised, the TD could have required the player to complete the call.
And given a player did act behind him, and did make a raise, perhaps that also entered into his thinking. There does not seem to be any rule which would prevent that. Seems like a reasonable, if unfortunate, ruling to me.
As an aside, the RRoP cash game rule is a little bit different.
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8. Because the amount of a wager at big-bet poker has such a wide range, a player who has taken action based on a gross misunderstanding of the amount wagered needs some protection. A bettor should not show down a hand until the amount put into the pot for a call seems reasonably correct, or it is obvious that the caller understands the amount wagered. The decision-maker is allowed considerable discretion in ruling on this type of situation. A possible rule-of-thumb is to disallow any claim of not understanding the amount wagered if the caller has put eighty percent or more of that amount into the pot.
Example: On the end, a player puts a $500 chip into the pot and says softly, “Four hundred.” The opponent puts a $100 chip into the pot and says, “Call.” The bettor immediately shows the hand. The dealer says, “He bet four hundred.” The caller says, “Oh, I thought he bet a hundred.” In this case, the recommended ruling normally is that the bettor had an obligation to not show the hand when the amount put into the pot was obviously short, and the “call” can be retracted. Note that the character of each player can be a factor. (Unfortunately, situations can arise at big-bet poker that are not so clear-cut as this.)
and also
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12. A player who bets or calls by releasing chips into the pot is bound by that action. However, if you are unaware that the pot has been raised, you may withdraw that money and reconsider your action, provided that no one else has acted after you.
Those two rules are similar, but not identical, which is...unfortunate. The first one applies to misunderstanding even the opening bet (as given in the example), the second only to an undercall after a raise, but ideally these would be written more crisply to make it much more clear which rule applies when, and whether rule 12 is also at the floor's discretion or whether they have that option 100% always as a rule (which seems excessive and abusable).
So in a cash game, the fact that a player behind you acted after you undercalled may in fact affect your options (and in particular, might prevent giving you the option to take back your bet and reconsider).
In both situations, the TD has some latitude in his decision making, because of rule 1 if nothing else. IMO a lot depends on the context of the fellow raising behind - does the dealer think he did so purposefully after the dealer had pointed out the issue and was trying to correct it, or was it done in turn at game speed and likely with no bad intentions? No easy answer here.
Last edited by dinesh; 01-13-2019 at 12:40 PM.