Event: James Essinger Trophy - Summer Swiss

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Opponent	Rating	Result
Graham Wilson	1162	1 - 0
Paul Worledge	1925	0 - 1
James Cole	1479	0 - 1
Bob Wallace	1408	0 - 1
Roy J McAloney	1422	0 - 1

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

1239 = (7396 + 400 * (1 - 4)) / 5)