Event: Division 2

Opponent Rating Result
Andrew Mowat 1743 0 - 1
Roger Bray 1530 ½ - ½
Luke Sullivan 1546 1 - 0
David W Fone 1589 ½ - ½
Geoffrey C Rosser 1630 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1528 = (8038 + 400 * (1 - 2)) / 5)

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