X-Ray Checkmates

X-ray Pieces.

Sometimes pieces can work through other pieces, X-ray style.

Lets look at an example of an X-ray checkmate.

In the first position black has has just checked the white king with the rook. Normally this would be stupid because the bishop can take the rook, (see the second diagram) but because the black queen can work through the white bishop, mate happens in the end.

Here are the three diagrams!