Event: Summer Max 560 Division

Opponent Rating Result
Dave M Davies 150 0 - 1
John Grant 111 ½ - ½
Dave M Davies 150 0 - 1
John Grant 111 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-170 = (522 + 400 * (0 - 3)) / 4)

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