Event: Division 3 West

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Opponent Rating Result
John S O'Neill 132 ½ - ½
Martin I Willis 129 0 - 1
Patrick S Wojcik 114 1 - 0
Martyn J Maber 115 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

23 = (490 + 400 * (1 - 2)) / 4)

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