Absolute Pinned Queen Can still be a Defender for Checkmate?

I cannot always trust the Internet, but I'm pretty sure I can trust the chess.com forum <grin>:  

A puzzle has me doubting the solution which involves an absolutely pinned queen serving as a defender for a checkmating rook.  Is it true?  Can a pinned piece still serve as a defender of another piece?  It just doesn't seem right, but maybe my perspective is wrong?

No guessing please.

(the puzzle for context:  3r1r1k/p4pR1/7p/1pp1P3/8/3Q1P1P/1qPK4/6R1 w - - 1 25)

Sorry, maybe I should have been more clear: Of course, the absolutely pinned queen is already defending a piece (my king). But, may it also then simultaneously service as a defender from the opposing king of another piece (a rook involved in a check[mate])?

Yes it can.

All absolute pinned pieces can still defend a piece that is checkmating.

Not a guess.

Thanks much!

The World Chess Federation is called FIDE (Federation Internationale d'Echecs) and is the ultimate authority on the rules of the game.

FIDE Rules article 3.9

... makes it clear that a PINNED piece can still participate in a checkmate by guarding the mating piece.

ze position in question

yeah if it could not you are basically saying "white has to keep his king out of check (by not moving the queen), so blacks king can go into check(by taking the rook)"

thats a double standard basically

Many thanks for the generosity of the respondents' time and kindness of their replies.

It has been suggested to me to consider a perspective of timing:

My queen would not abandon defense of my king, because my checkmate on the opposing king is executed first (before my queen could theoretically "abandon" an absolute pinned position).

Mind expanded.

Another way to imagine is that checkmate means the capture of a king is unavoidable on the next move, and the capture of a king ends the game. It doesn't matter if your king can be taken on the very next move, whoever captures the enemy king first wins.

Thanks

I'm a GM.............................................................................................................................. Just kidding i'm not

So, if The queen Is pinned, there is no way to defend the checkmate, unless... if that piece is not PP on the PP then there's actually a way to stop checkmate by controlling that square that's threatning checkmate, so.... THERE IS ABSOLUTELY NO WAY A PINNED PIECE TO DEFEND CHECK AND MATE!

oh oh i messed up..

i thinked that the queen needs to defend the checkmate that the opponent is threatning, sorry..

An absolute pinned piece can defend the piece that is doing check and mate!

Even the piece that delivers mate can be pinned.

yeah, kinda because the piece pinning the queen

is pinned

if it were not, this would be only check because- it could capture the queen!