Event: Division 2

Opponent Rating Result
Steve Whatmore 1820 ½ - ½
Peter J Leary 1788 0 - 1
Steve Tyler 1721 0 - 1
Bowie Carter 1624 ½ - ½
Simon Walton 1662 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1643 = (8615 + 400 * (1 - 2)) / 5)

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