50NL: Playing a straight with a flush on board

[f1sh4d1nner]

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set-two pair? maybe im an idiot but yeah.

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With this board i think only a poor player with set would call your raise , with 2 pairs 99% decent players will fold.
I will call his bet on the river with my straight but that's it, a raise is not worth here.

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But are 99% of the players playing 50nl all decent above average players?