Event: Margate Rapid-Play

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Opponent	Rating	Result
Joseph Morris	1045	0 - 1
Roy J McAloney	1263	0 - 1
Leon A Garfield	1300	1 - 0

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

1069 = (3608 + 400 * (1 - 2)) / 3)