Event: B Division

Opponent Rating Result
Bill March 1578 ½ - ½
Dave Frank 1552 0 - 1
David Smith 1465 1 - 0
Paul Frank 1540 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1434 = (6135 + 400 * (1 - 2)) / 4)

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