can you explain what that is to all of us who weren't there?
plunderchess

It's like normal chess except that whenever a piece is captured, the capturing piece has the option of "plundering" the ability of the captured piece. Then a donut-shaped token is placed on the piece which identifies it of having that power, in adition to its own. Once the piece uses up an ability given to it by that token, the token is removed. A piece can only plunder from another piece if it gains an ability it doesn't already have. For instance, a queen cannot plunder from a bishop. (But it can plunder from a pawn, and gain the ability to capture en passant.)
I had the opportunity to play it with a friend of mine recently. It definitely adds an additional strategic element to the game. It's often a disadvantage to be the one that initiates an exchange, if the other player can recapture with a piece that can plunder. It's also interesting in that a king can actually deliver check, or even checkmate, if it has plundered from a long-range piece.

when a piece captures another piece, it gets that other piece's powers for 1 time use
So what you meant was 1.e4 Nf6 2.e5 d5 3.exf6+?
everyone who went to the supernationals, did you like plunderchess?