Event: OTB "Friendly" Matches

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Opponent Rating Result
Huw D Jacob 1495 ½ - ½
Alfie Green 1697 1 - 0
Michael GA Wilson 1670 0 - 1
Jay Sharman 1624 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1522 = (6486 + 400 * (1 - 2)) / 4)

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