Event: Open-Rapid-play

Opponent Rating Result
Tony Preece 1841 ½ - ½
David Thomson 1914 1 - 0
Tony Preece 1841 ½ - ½
David Thomson 1914 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1878 = (7510 + 400 * (1 - 1)) / 4)

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