3 Fun Chess Variants #1: Spoiler Alert!

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This is Variant 1 of the 3 Fun New Chess Variants.

Name:  Spoiler Alert

Objective: Checkmate

This requires 3 players so there is no example. 

Find something that can fit on one of the squares of your chessboard. The Spoiler always starts on one of the 4 central squares. The Spoiler moves like a queen and serves you queen if you catch her! (You can place her on any free square like Bughouse)