River Bet Against Donk?

[Lucky]

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Probably one of the worst boards to double/triple barrell a donk. Not many draws he can have so a lot of his range is Ax which isn't folding ever.

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True, and 6 handed I'd just cbet flop, figuring this guy will give me a lot of credit for ace, and be done with if called. 3 handed confuses situation a little more, but you're probably right that betting river is just spew here.