Event: D Division

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Opponent	Rating	Result
Joel Prittie	1490	0 - 1
Dan Burgess	1461	½ - ½
Joe Barratt	1428	1 - 0

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

1460 = (4379 + 400 * (1 - 1)) / 3)