Event: Bottom Half A&B Division

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Opponent	Rating	Result
Harry Tennant	1543	1 - 0
Joe McGinnis	1679	1 - 0
James Urwin	1638	1 - 0

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

2020 = (4860 + 400 * (3 - 0)) / 3)