Event: St Andrews Intermediate Tournament

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Opponent	Rating	Result
David P Thrun	1345	½ - ½
Ronald Botham	1083	0 - 1
Colin Hurst	1023	1 - 0
Henrik Salbol	1398	0 - 1
David Atkin	0	½ - ½

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

890 = (4849 + 400 * (1 - 2)) / 5)