Monthly record of Loser_user's rank (dan/kyu)
month dan/kyu win/lose win ratio
2020 /08 1.00 Dan 10 win 0 lose 1.00
2020 /06 5.00 Kyu 5 win 0 lose 1.00
2019 /05 9.00 Kyu 1 win 0 lose 1.00
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