Event: Silver Rook

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Opponent	Rating	Result
Oliver Tatlow	1607	½ - ½
Tim Pryke	1375	1 - 0
Daniel Geng	1018	1 - 0
Charlie Wainwright	1483	0 - 1
Kenneth L Marsden	1368	1 - 0
Mike Edbury	1648	0 - 1
David Callaghan	1069	1 - 0

performance = (sum(opponents ratings) + 400(wins-losses)) / games

1481 = (9568 + 400 * (4 - 2)) / 7)