I'm black and on move #25, why does white just sacrifice his queen? A 1500? A mouse slip I guess...
If he's anything like me then he probably got his thought processes in a tangle, thinking about exd6, leaving the e7 pawn pinned to the black king by the rook on e1, then decided that with the rook pinning the e7 pawn, it was safe to play Qxd6. Maybe?!