Event: Doncaster Handicap League

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Opponent Rating Result
Gordon Harrison 105 ½ - ½
Neil S Shaw 115 0 - 1
Alan J Smith 111 0 - 1
Robbie Merc 104 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

9 = (435 + 400 * (1 - 2)) / 4)

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