Event: William Jeffrey Cup - Margate 30

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Opponent	Rating	Result
John L Clarke	1362	0 - 1
Harry J Sharples	1651	0 - 1
John L Clarke	1362	0 - 1
Joseph Morris	1383	1 - 0
Keith C Findley	1765	0 - 1
Keith C Findley	1765	½ - ½
James Cole	1553	1 - 0
James Cole	1590	½ - ½

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

1454 = (12431 + 400 * (2 - 4)) / 8)