Event: Division 4

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Opponent	Rating	Result
Richard Barnes	1453	½ - ½
Samson Main	1881	0 - 1
Noel E Hendricks	1615	½ - ½
Brian Crewe	1627	½ - ½
Nicholas Woods	1351	1 - 0
Thomas Booth	1388	1 - 0
Elmira Walker	1602	1 - 0
Kanagasabai Balasubramaniam	1328	1 - 0

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

1681 = (12245 + 400 * (4 - 1)) / 8)