Event: 5th Somerset New Year Minor

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Opponent	Rating	Result
Patrick P Sartain	0	1 - 0
Richard Brenton	0	1 - 0
Martyn J Maber	1508	1 - 0
Aiden Chivers	0	0 - 1
Richard Collis	0	1 - 0

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

542 = (1508 + 400 * (4 - 1)) / 5)