Event: Division 1

Opponent Rating Result
Simon Johnson 1913 0 - 1
Ian Paul Stephens 1768 ½ - ½
Ian Nicholson 1581 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1621 = (5262 + 400 * (0 - 1)) / 3)

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