Event: WMA Spring League Division 2

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Opponent	Rating	Result
Arnold G Kirkland	70	½ - ½
J Wojciech Czopek	0	1 - 0
AD (Tony) Williams	0	½ - ½
John Foxall	70	½ - ½
Tim A Lane	0	½ - ½
James Munns	0	0 - 1
Arnold G Kirkland	70	1 - 0
J Wojciech Czopek	0	0 - 1
AD (Tony) Williams	0	½ - ½
John Foxall	70	½ - ½
Tim A Lane	0	0 - 1
James Munns	0	1 - 0

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

23 = (280 + 400 * (3 - 3)) / 12)