Event: Durham League Division 1

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Opponent	Rating	Result
Kevin J Wilson	0	0 - 1
Douglas J Smith	0	1 - 0
Ethan Sanitt	0	½ - ½
Brian Towers	0	1 - 0
John M Findlay	0	1 - 0

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

160 = (0 + 400 * (3 - 1)) / 5)