Event: Worcester City Club Rapidplay Championship Prelim

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Opponent	Rating	Result
John Hesketh	1479	1 - 0
John Hesketh	1479	1 - 0
Simon Berry	1356	½ - ½
Rob Sutton	1670	0 - 1
Rob Sutton	1670	0 - 1
Joe Rastall	1608	0 - 1
Joe Rastall	1608	0 - 1

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

1439 = (10870 + 400 * (2 - 4)) / 7)