Event: Sheffield Chess Centre U1750

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Opponent	Rating	Result
Michael I Connor	1702	0 - 1
Chris A Fraser	1549	1 - 0
Tim Holt	1769	1 - 0
Roger Greatorex	1743	0 - 1

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

1691 = (6763 + 400 * (2 - 2)) / 4)