Event: Derby Long play

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Opponent	Rating	Result
David Smith	153	1 - 0
Andre Cockburn	119	0 - 1
Adrian J Dibble	88	0 - 1
Shah Hussain	127
Luke Woodward	36	½ - ½

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

-1 = (396 + 400 * (1 - 2)) / 4)