It's not a double checkmate, it's a checkmate by double check. What would be really impressive is a discovered checkmate, where the piece discovering the attack also gives a check, but a check that is irrelevant, since any discovered check would mate anyway.
Double Checkmates

Doh! You roped me in here to see if a double checkmate was actually possible and its just a double check and mate! False advertising, you!

I'm trying to imagine a position in which both White and Black are simultaneously checkmated. I suppose it's possible to construct, but I think the last move would have to be moving a piece pinned to the King to give mate the other way.
Under the rules, that would be an illegal move. But I suppose if such a unique position were achieved, one could argue that the game is, or ought to be, a draw!

I conjecture that a true double checkmate is impossible - we'll call it the sandmaster conjecture. Sorry for the false advertising, but does anyone have any other such pics?
P.S. Anna girl this happened because I played a very aggresive game vs the computer one day and *WHAM* managed to get this lovely checkmate. I don't remember the exact seuqnece of moves, but I think the CPU moved his castle to e1 and I moved my knight straight after my queen was under threat.

I'm trying to imagine a position in which both White and Black are simultaneously checkmated. I suppose it's possible to construct, but I think the last move would have to be moving a piece pinned to the King to give mate the other way.
Under the rules, that would be an illegal move. But I suppose if such a unique position were achieved, one could argue that the game is, or ought to be, a draw!
something like this?
1...Be4 ## lol!!
EDIT: hmm...now that I think of it...I should remove the f2 pawn lol!!
It's impossible to get a double checkmate. think about it. if white moved a piece that checkmated black but also his own king, then the move would be illegal. same with black. you cannot put your own king into check.

Hey, check this game ending I managed to get whilst playing the computer, rather beautiful I think.
Does anyone else have pictures of such "double checkmates"? I'd love to see them.