I don't know how the conditional moves work,if it was me.Please explain. To Pun.
Conditional Moves w/ underpromotion

Unless the under-promotion gives check, if he has the opportunity to take he can take, even if the pawn promoted to a smurf.

Yes, I know he can take, but when making a conditional move, the player usu. selects what the pawn is to be promoted to, if he speculates wrong - does the move still carry through?
I don't think it should, but that's just me

P_U_N wrote:
Yes, I know he can take, but when making a conditional move, the player usu. selects what the pawn is to be promoted to, if he speculates wrong - does the move still carry through? I don't think it should, but that's just me
It may not seem like much of a deal but I agree with you. The threat is different depending on the promotion, your opponent should be prompted with the following move so he has a choice to make. (Unless of course when he was scripting his conditional moves he specified that you would underpromote.)
I don't remember being in this situation yet but I think he would have had to.
Could be wrong..

i don't think one should use conditional moves on important moves, like opening, promotions or risky tactics....

I actually like the old rules where you had the option of leaving the piece as a pawn, or even promoting to a piece of the opposite color. See
http://en.wikipedia.org/wiki/Promotion_(chess)

yes, I am pretty sure that when using the conditional move you are asked what the promotion is and that, if the move was conditionally followed through, your opponent must have predicted the under-promotion. Usually it is fairly obvious to both players when an under promotion is the best thing to do.
I just made a move in a game, where Underpromoted a piece ( i chose a knight instead of a queen), and my opponent had a conditional move in to take the promoted pawn, I'm wondering though, (unless he predicted I would underpromote) if the conditional move should still hold true in the case of a pawn promotion that is not a queen.