Event: Ladder Tournament

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Opponent Rating Result
David Websdale 1427 ½ - ½
Ian Patterson 1169 0 - 1
Roger Beeson 1122 1 - 0
Jack O'Hare 1299 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1154 = (5017 + 400 * (1 - 2)) / 4)

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