Event: Folkestone Club Championship

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Opponent	Rating	Result
Oliver White	0	0 - 1
Matt Davies	1100	1 - 0
James PW Smith	1400	0 - 1
Tim Waggott	1233	0 - 1
Thomas Milligan	1405	0 - 1

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

788 = (5138 + 400 * (1 - 4)) / 5)