Event: Division A

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Opponent Rating Result
Graham W Dobson 171 0 - 1
Cliff H Rutlidge 157 1 - 0
Alan Pidcock 136 ½ - ½
Geoffrey Pennington 143 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

252 = (607 + 400 * (2 - 1)) / 4)

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