I have been having a hard time finding the full rules of fixed-limit poker pertaining to all-ins.

For example,

Scenario #1:

Fixed bet size of $20, capped at 4 bets.

Player 1 bets all-in for $5.

Player 2 raises all in to $10.

Player 3 has a full stack and wishes to raise. What size is the raise? $20? $30?

Scenario #2:

Fixed bet size of $20, capped at 4 bets.

Player 1 bets all-in for $5.

Player 2 raises all in to $10.

Player 3 re-raises all-in to $15.

Player 4 re-raises all-in to $20.

Is player 5 allowed to re-raise? Technically there has already been a bet and three raises, for a total of 4 bets so is the action capped?

I understand these scenarios are extremely rare but I have not been able to find the exact rules for these situations.

Also, I understand the rules may vary from card room to card room, but I'd assume they are uniform across online poker software.

As always, house rules vary. But generally speaking in fixed limit games, a player facing a less-than-limit bet cannot raise, but has the option to complete the partial bet to a full bet, which can then be raised by later players. So in your first scenario, player 3 could complete to $20, player 4 could raise to $40, etc., and the 3-raise cap would happen at $80.

That said, there are some rooms that use a "half bet" rule; that is, if the incomplete bet is half or more of the limit, then it is considered complete. In this case, player 3 would make it $30, and this would be considered the first raise, the next being $50, and the cap being $70 (assuming no other half-bets).

In scenario 2 under standard rules, player 4 has completed the first bet, and player 5 may raise to $40, and the cap is $80. Under half-bet rules, player 5 may raise to $30 (because player 2's $10 bet is the first complete bet), and the cap would be $70.

In your first example, player 2 is not raising, but rather calling, as the minimum bet is $20. So player 3 would have the option of raising to $40.

Example 2 is similar. None of the first 4 players are technically raising, so player 5 does have the option to raise to $40.

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