Event: Sheffield Chess Centre U1750

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Opponent	Rating	Result
John Gillett	1390	0 - 1
David C Dunne	1427	0 - 1
Mohammed Rohman	1483	0 - 1
Kirin Harrington	1341	0 - 1

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

1010 = (5641 + 400 * (0 - 4)) / 4)