
Solution

1… Qd1+ 2. Kg2 Qxg4+
The point is that the white queen is absolutely pinned on the g-file, which makes 2. Qxd1 an illegal move since the white king will be in check by the black rook on g7.
Structured Chess Training
1… Qd1+ 2. Kg2 Qxg4+
The point is that the white queen is absolutely pinned on the g-file, which makes 2. Qxd1 an illegal move since the white king will be in check by the black rook on g7.
I missed this one. Looking at it when the answer is known, the solution seems so obvious. I need to look at the whole board.
This is a tricky one, I occasionally miss this type of pin where a pinned piece is pinning another piece.