What is this called? If they can't block / remove both checking pieces at the same time, that's checkmate right?

It's not possible.

If it is, it's a double check.

easily possible. if you have your bishop and your queen and other person's king lined up on a file, then you move bishop sideways one square aiming at king, your queen is behind it also aiming at king. You should delete your first comment. it make it hard to trust your opinion, and you haven't answered my checkmate question anyway.

It's called double check, but it's not checkmate if the K can move. 

Then it'd be in check already.

So no, I won't delete it.

Also, don't be entitled @wollyhood. I don't have to remove the post.

Ok thanks guys, like if the K is still in check after they do one move, then that's it I must win. Obviously I win. I just never heard or seen of it before, not anything like this anyway

I guess the fundamental rule is ... if you can't get out of check the other person wins via checkmate.

Well don't be redundant then MouseOnDrugs. Or take better drugs or something.

The game is shaping up quite nicely for me I'll show you a pic. Of course that discovered double check is a lot further along in my wild dreams xD

I guess it's going so well for me because I made their own bishop so bad and they castled onto their bad side or something, now their powerful pieces are all a bit stuffed right now

¯\_(ツ)_/¯

I think this one game is showing me how powerful that pawn on e5 is for me too, even by itself which is very enlightening.

enlightening indeed. I hope both of us ascend to a greater plane as a result of the e5 pawn's power

Powerrrrrrrrrrrrrrrrrr... Reveal your true form sadkid2008 have been super impressed by your elevated rating this week xD

Yep, it's a double check. 2 of the 3 ways to get out of check are unavailable to you if you get double-checked (capturing the opponent's piece and blocking the check). The only way out of a double check is to move the king - if you can't, it's checkmate!

We cover this tactical theme and many more on the "Tactical Training" video on chesspathways.com - feel free to check it out if interested, I'd love to get your feedback!

An illustration to explain Blakey's point.

Both the knight and the bishop can be captured, and the check from the bishop can be easily parried. Alas, the rules of chess only allow for one move to be made at a time, and thus we cannot eliminate the two simultaneous attacks by the knight and the bishop in a single turn by capturing or by defensive interference.

Hence, the king is forced to escape on his own. Ironically, the same queens in charge of capturing the knight and defending against the bishop actually block the king's escape squares and the king cannot run out to b7 since the b7 square is also under attack by the same bishop. This leaves Black with no legal move left to escape the check. Hence, the double-check cannot be parried effectively, and the position is a checkmate.

In this second case, the White king has escape squares to escape the double check, and hence, the position is not an immediate checkmate (but it will be in a matter of moments).

Double-check. Sometimes, can result in checkmate.