[Fantam]

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Better way to look at the situation:

"One of my opponents probably has spades. What do I have to bet such that he can never properly call the turn with spades, even if I call his push on a spade river 100% of the time?"

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this is the kinda thing im struggling with so far

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Its not too hard to do the maths.

There is 120 in the pot on the turn and Hero has 335 left. Therefore the most that villian can win is 455 if Hero is pot committed and will always shove on the river.

Next, villain has 8 outs to the nut flush, as the 8s makes a full house for hero. (Ty to earlier poster for noticing this.)

Villain's odds of making the nut flush with 1 card to come are therefore 46:8 or 4.75:1.

That means that a bet of 455/5.75 = the breakeven point = 79.

So any bet of 80 or above by hero would make calling with a fd -EV for villain.

Of course, random villains often will make -EV calls, and so it is still difficult for hero to know what to do if the 3rd flush card falls on the river.