Quote Originally Posted by sarbox68
I think this is an easy question... which probably means I've got the wrong answer...

I vote for 12 because that means he's only getting 3:1 to call, and is 4.75:1 against (I think something like that...) to his flush on the river.

Betting the 30bb overbets the bot IMO, and at $10NL, he's more than likely to call regardless. The larger bet is very unlikely to increase my chance of pushing him off of the hand. So when the scare club hits on the river, I've got a bigger pot to bet into to test whether he was indeed on the flush draw and I'm going to end up losing more money.

So... 12bb takes the odds away. Means (assuming he only calls), that I can go with a 18-20bb river bet if the 3rd club hits and fold to a raise.
Take some time to really consider the part I put in bold text here. If you knew without a doubt that he's going to call the 30bb bet every single time then that's easily the best play because it REALLY gives him bad odds to call, but since you don't know that, why is the 12bb bet better?

Also, assume you know what villain's cards are. Obviously then you're not going to bet the river if he hits a club, but what's your play if he misses?