Monthly record of otuma's rank (dan/kyu)
month dan/kyu win/lose win ratio
2021 /05 2.47 Dan 24 win 24 lose .500
2019 /10 9.00 Kyu 1 win 5 lose .166
2019 /02 8.00 Kyu 2 win 2 lose .500
2019 /01 8.00 Kyu 2 win 5 lose .285
2018 /12 7.00 Kyu 3 win 11 lose .214
2018 /05 7.00 Kyu 3 win 2 lose .600
2018 /04 2.01 Dan 13 win 23 lose .361
2018 /02 3.00 Kyu 7 win 9 lose .437
2018 /01 7.00 Kyu 3 win 4 lose .428
2017 /09 2.25 Dan 15 win 20 lose .428
2017 /08 1.00 Kyu 9 win 13 lose .409
2017 /07 1.69 Dan 11 win 28 lose .282
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