Event: Division 4

Opponent Rating Result
Richard Dyce 1502 0 - 1
Poppy Dawson-Best 1247 1 - 0
Pete Anderson 1535 1 - 0
Alan Shaw 1140 ½ - ½
Ben Eyres 1136 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1472 = (6560 + 400 * (3 - 1)) / 5)

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