Event: Maidstone Players Trophy

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Opponent	Rating	Result
Robert E Lane	140	0 - 1
Petko Kunev	110	1 - 0
Nigel Osina	91	0 - 1

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

-20 = (341 + 400 * (1 - 2)) / 3)