Event: 3rd Chess Centre Rapid U1750

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Opponent	Rating	Result
Ian McDonald	1652	0 - 1
Omar Moylayev	804	1 - 0
Kumar Shiralagi	0	0 - 1
Stephen K Lee	1692	0 - 1
Hugh Shipley	0	½ - ½

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

670 = (4148 + 400 * (1 - 3)) / 5)