Event: Division 2

Opponent Rating Result
Simon Walton 1644 0 - 1
Peter J R Oliver 1589 1 - 0
David J Friend 1609 0 - 1
David W Fone 1597 1 - 0
Steven R Colwell 1548 ½ - ½
Leslie Andrews 1536 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1521 = (9523 + 400 * (2 - 3)) / 6)

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