Event: Kenneth Appleby (U1700)

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Opponent	Rating	Result
Hugh Thornton	1605	½ - ½
Chris Hare	0	1 - 0
Peter J Clark	0	0 - 1
Stephen Forbes	1492	0 - 1

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

674 = (3097 + 400 * (1 - 2)) / 4)