Event: OTB "Friendly" Matches

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Opponent Rating Result
Eitan Eisen 1335 0 - 0
Eitan Eisen 1335 0 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

0 = (0 + 400 * (0 - 0)) / 0)

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Opponent Rating Result
Freddie Bonnar 1167 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1567 = (1167 + 400 * (1 - 0)) / 1)