Event: Belper Club Championship

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Opponent	Rating	Result
Kenelm Acons	1523	1 - 0
Vaughan WG Smith	1568	0 - 1
Michael O'Brien	1359

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

1546 = (3091 + 400 * (1 - 1)) / 2)