Event: Derby Long play

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Opponent	Rating	Result
Luke Woodward	36	0 - 1
Chris Sharp	100	0 - 1
Shah Hussain	127
Craig Harrison	109	½ - ½
Nikki Jovanovic	0	½ - ½

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

-139 = (245 + 400 * (0 - 2)) / 4)