Event: Silver Rook

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Opponent Rating Result
Paul Howden 1666 1 - 0
Robert Oldfield 1552 1 - 0
Bertie Leatham 1330 0 - 1
Martin Baxter 1655 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1551 = (6203 + 400 * (2 - 2)) / 4)

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