Event: Margate Rapid-Play

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Opponent	Rating	Result
Clive J Le Baigue	99	0 - 1
John L Clarke	92	0 - 1
Roy F Dawson	53	1 - 0

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

-52 = (244 + 400 * (1 - 2)) / 3)