Event: Derbyshire Individual

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Opponent	Rating	Result
David Smith	153	½ - ½
Martin Cobham	142	½ - ½
David JF Woodhouse	126	½ - ½
Colin Ross	117	1 - 0
Alan F Downham	162	½ - ½

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

220 = (700 + 400 * (1 - 0)) / 5)