Event: D&DCL Div 2

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Opponent	Rating	Result
Stephen G Wootton	1607	0 - 1
Martin Cobham	1750	0 - 1
Owen Dale	1643	1 - 0

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

1533 = (5000 + 400 * (1 - 2)) / 3)