Event: St Andrews Intermediate Tournament

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Opponent	Rating	Result
David Atkin	0	1 - 0
David P Thrun	1345	0 - 1
Ronald Botham	1083	1 - 0
Darren Tomlinson	973	1 - 0
Colin Hurst	1023

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

1050 = (3401 + 400 * (3 - 1)) / 4)