Event: GP2 - October

Opponent Rating Result
Oliver Balp 1487 1 - 0
James Lumsden 1748 ½ - ½
William H Luxton 1589 1 - 0
Luke Chapman 1873 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1774 = (6697 + 400 * (2 - 1)) / 4)

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