Event: 5th Simon Bartlett Memorial Major

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Opponent	Rating	Result
Tim Jones	1838	1 - 0
Mark V Abbott	1885	0 - 1
Mark Thomas	1912	0 - 1
Thomas Merchant	1582	0 - 1

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

1604 = (7217 + 400 * (1 - 3)) / 4)