I got to there river. Now what?

[Dreamer]

Lets look at the action.

The opponent is checking and calling all the way which suggests a draw or weaker holding (bad kicker?)
The only likley draw is diamonds but we get just a call on the turn.
(If he would have made diamonds ther is no way a player just calls the turns especially as he would not have the nut flush)

To my mind those who say check and fold get bluffed out of a lot of pots on scary boards like this when they should be the ones doing the semi-bluffing.
If you check and your opponents bets there is $190 in the pot for you call.
Given the opponent is checking all the way and a scary board I think a bluff bet when checked to is automatic by a lot of players let alone 15%

D.

[DeeJ]

Bet and fold to a raise. Clarkmeister applies. He has no idea whether you have a diamond or not.

[brick]

In the hand David check-called his hand was not good.

[1800GAMBLER]

I bet even clarkmeister would say his theorm doesn't apply here.

[astroglide]

is clark's theorem bet and fold to a raise on a 4flush board? it's not going to work in this game.

[theBruiser500]

here is a new idea for all you LHE players that you are not familiar with. check/fold. your opponent probably has you beat and if he is considering a bluff he must think you checked with the intention of calling