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.
Exercise #5
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.