To get the exquisite Olive Belt, our students simply need to execute a "backrow."

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A backrow is the situation on a chess board when you checkmate your opponent's king when they are still hemmed in by their own pieces. Here is the classic example:

Note that once the white queen moves to the green square, the black king is in check and has no legal move to end the check. You have effected a backrow!

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Backrows usually take a more complicated form than this. In the situation below, can you spot the sequence that backrows?

Right! The F3 rook moves to F8 beginning a forced sequence of captures that culminates in a backrow. Notice that the white bishop's control of the B7 square helps out with this backrow. 

As you can see, once the rook checks at the red square, the black rook has to capture since that is the only legal move. When the other white rook captures that black rook, the poor black queen again is forced to capture the black rook, since that is also the only legal move. After the black queen captures that rook, the white queen captures the black queen, backrowing black. Backrowing is easy and fun, and the only way to acquire that Olive Belt!