Man, it really is hard to come up with a simple, clear rule about this, isn't it?

browser: The test case is whether you CAN remove ANY newly placed chip (i.e. you must disregard any chips already in play because of blinds or previous bets) and still have a valid call. If so, then it is a raise. If not, then it is a call, because of the oversize chip rule [which need not be a single oversize chip].

An illustrative example: bet 200, raise to 600, next player puts in two 500 chips. Is that a call or a raise? It is a call because of the oversized chip rule. Even though two chips were actually used. If you try to remove either one of the two chips, you do not have enough for a call, so by rule it is a call.

The TDA rules adds some additional complexity for no reason by stating that the multiple chips have to also be the same denomination. This isn't really required, but the use cases that demonstrate why are generally not very realistic so it generally doesn't cause much issue.

I like to think of it as only one of the chips was oversized the first 500 wasn't bigger than the bet so it isn't an oversized chip, that leaves 100 of bet remaining and the second 500 is oversize to that 100.

using this line of thinking removes the need for the multichip rule.

They took that language out in the new rule.