Event: A Division

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Opponent Rating Result
Andy Corbyn 151 ½ - ½
Andrew Killick 155 0 - 1
Geoffrey Howsden 89 ½ - ½
Brian Whitaker 107 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

126 = (502 + 400 * (1 - 1)) / 4)

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