Event: Reading-Chess-Other-Rated

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Opponent	Rating	Result
Tony Jones	1250	0 - 1
Steve Bartle	1865	0 - 1
Dragos Strugar	1900	0 - 1

performance = (sum(opponents ratings) + 400(wins-losses)) / games

1272 = (5015 + 400 * (0 - 3)) / 3)