Event: Ladder Tournament

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Opponent Rating Result
Roger Beeson 1180 0 - 1
Oscar Brown 1423 0 - 1
David Hasen 1228 1 - 0
Neville T Rowden 1265 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1274 = (5096 + 400 * (2 - 2)) / 4)

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