Event: John Davis 6200 League

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Opponent	Rating	Result
J Newton	1430	0 - 1
Andrew Williams	1365	0 - 1
John Pickering	1415	1 - 0

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

1270 = (4210 + 400 * (1 - 2)) / 3)