Gentlemen,
I've come to the conclusion that the rules are written as they are, just so we can debate what they are really trying to say.
The following should be considered for amending TDA Rule #37 Raises…This would replace the last sentence in the existing rule.
How does this sound?... Check -raise is permitted in all games only after a complete legal bet has been made on that betting round. Any short all-in bet ( action only), will not reopen betting options to any player that has checked, or bet, prior to the all-in wager.
Once a player has acted by checking or betting, they may not re-open the betting on that round unless another player makes a full bet or raise.
The standard amount considered necessary for an all-in bet to qualify as a full bet will be governed by the limit for that game.
limit: The all-in must be at least 50% of the required amount for that round.
No limit: Because there is no fixed amount for any betting round, only the minimum, the required amount necessary to re-open a round of betting must be 100% of the bet or raise.