Can the king be checked simultaneously by more than 2 enemies?

Ok, so there is double check.  I'm wondering if a triple (or more) check is ever possible?

It seems not possible because in order to have a triple check because following the requirements of a double check (and extending it), there must be 2 discovered checks with a single movement (which creates its own check), which is impossible.

But, maybe there's some rule or something I've not considered?  (E.g. I didn't know about the promotion rule just a few months back, so I didn't know that you can have more than 1 queen in your army).   Is it possible?

you can fork three kings

Thanks; it confirms what I thought WRT triple checks.

It's funny in that you think you know the chess rules until you start to write a chess program, then you realize all the details that you didn't know.  Each program I write I learn something (like the finer details of castling, 50 no-progress moves, how the 3-repeat draw can be claimed, etc.)  This question probably sounded silly, but it is actually needed for another program where I need to check for checkmate (in the past, I just ask all enemy chessmen whether each is checking the check; this time around, I must be efficient so I search from the king and knowing that only 2 checks are possible can stop the search quicker).  Oh, another interesting thing about writing chess programs is that I've learned most of the terms used in chess (e.g. pawns are not pieces : )

Yes, I actually already know about the triple chess in Chinese chess which can have 2 discovered checks via its cannon piece.

If you can show an example, that'd be really useful.  Like a proof, a single counter is all it's needed.

This program is for a portable electronic chessboard; and if I can stop the search at 2, then that can save power.  Currently, software is "complete", in the sense that it works but you can't slide pieces (I think it is possible to support that so next version... iterative improvement : )  The board hardware is lagging right now.  Once done, I'll publish the specs so folks can make their own eboards at ~$50 AND use own chess set with it.

If allowed more than 1 king, then can't you fork up to 7 with a knight?

Yes, thanks. I was mainly worried that there may be yet another chess rule that I was unaware of.

Why does this question keep popping up?

It is an honest question!  Well, I never really thought about triple checks, etc. always believed that double checks is the max until I must get it right, and the answer isn't all that obvious due to all the strange rules in chess.

I think a bold statement right at the beginning of the chapter on checkmates in beginner chess books... something like "There can be at most 2 simultaneous checks on the king" can help eliminate this sort of question.