Monthly record of ookuma's rank (dan/kyu)
month dan/kyu win/lose win ratio
2020 /05 10 Kyu 0 win 1 lose .000
2017 /08 7.00 Kyu 3 win 0 lose 1.00
2017 /06 10 Kyu 0 win 1 lose .000
2017 /02 10 Kyu 0 win 1 lose .000
2016 /12 9.00 Kyu 1 win 0 lose 1.00
2016 /11 9.00 Kyu 1 win 0 lose 1.00
2016 /10 9.00 Kyu 1 win 0 lose 1.00
2016 /03 10 Kyu 0 win 1 lose .000
2015 /09 9.00 Kyu 1 win 0 lose 1.00
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