Event: St Andrews Intermediate Tournament

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Opponent	Rating	Result
Darren Tomlinson	973	½ - ½
Henrik Salbol	1398	1 - 0
David Atkin	0	½ - ½
Colin Hurst	1023
Ronald Botham	1083	½ - ½

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

964 = (3454 + 400 * (1 - 0)) / 4)