[creedofhubris]

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I do not understand at all how you could be certain that you are ahead on the turn and not checkraise.

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He doesn't think he's ahead on the turn, he thinks one of his opponents has the low straight, but the bet is small enough, and he's got enough money behind, to smooth call and try to outdraw him.

As for how to play it: flop looks fine to me.

Turn, what a horrible situation with two very solid opponents; I tend to lead out, but I think your line is fine as well.

River: An open-push is bad if you think Martin will make a play for the pot with a missed draw (this seems quite possible to me), or if you think an opponent with a straight (or overpair?) will check it down, but will call your all-in bet (with the straight, they'll pretty much have to, getting 3:1 on their money.) You have too little behind to value bet anything other than all-in.

All depends on how likely they are to bluff, and to release second-best hands to your all-in; if they're very likely to do both, then check; if unlikely, then bet.

You should consider your game selection ;-)