This is a good move and 100% legal a cool. I'm not taking into account the bets so far. But let's just say as you flopped the nut str8 and go to the turn. If the turn brings the 4th card to a straight without completing the flush. Let say the turn is J
If you bet and villains calls or if he bets and you just call it becomes obvious you got unlucky and he may have now a straight too. So, you two got to split the pot at the end. But you don't do that. What you do is just before the dealer peals the river card you say: "pair the board - Baby!" -representing a set and if the board gets paired at the river ..., Wow! ... you shove all in, shove the entire deep stack. If villain is a nit tight player donkey he may find a fold and you take the pot that belongs to you by right. .., wtf .., (LOL) - if he calls you split
Sometimes in some special situations it becomes obvious you two guys have the same hand so you ask the dealer to pair the board at the end. And, if he did pair it, you shove. Usually in 4 card str8 on the turn you can figure if villain got that straight that you also have it. So, just ask for the magic paired board.
Last edited by outdonked; 07-18-2017 at 05:03 PM.