Monthly record of book_room's rank (dan/kyu)
month dan/kyu win/lose win ratio
2020 /12 10 Kyu 0 win 1 lose .000
2020 /11 9.00 Kyu 1 win 1 lose .500
2020 /05 5.19 Kyu 7 win 11 lose .388
2020 /04 6.00 Kyu 4 win 9 lose .307
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