today's puzzle?


There are no moves for black. The king has no moves. The only pawn move is g4 but then Bf6 is mate. Therefore the queen must move from f2, but if it leaves the 2nd rank eg Qe1 there is g3 mate because the g2 pawn is no longer pinned to the king. If it doesn't cover the g3 square eg Qe2 there is Bg3 mate. So the only move to prolong the game by one more move is the pointless Qg1+ sacrifice.