Event: Bottom Half A&B Division

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Opponent Rating Result
Stephen J jnr Roe 1673 0 - 1
Jim A Rogers 1615 0 - 1
Stephen Rodgers 1645 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1511 = (4933 + 400 * (1 - 2)) / 3)

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