Event: D Division

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Opponent	Rating	Result
Conor Hicks	1523	0 - 1
Khalid Khokhar	1515	0 - 1
Paul Shilton	1100	1 - 0

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

1246 = (4138 + 400 * (1 - 2)) / 3)