Event: 4-board Division 3

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Opponent	Rating	Result
William I Wright	1610	0 - 1
Robert Docwra	1651	0 - 1
Ronald Botham	1112	1 - 0
Jonathan R Slater	1300	0 - 1
Jacob Jackson	1000	1 - 0
Antony Holgate	850	1 - 0(def)

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

1255 = (6673 + 400 * (2 - 3)) / 5)