Monthly record of rubybook's rank (dan/kyu)
month dan/kyu win/lose win ratio
2020 /12 7.00 Kyu 3 win 5 lose .375
2020 /11 8.00 Kyu 2 win 2 lose .500
2020 /10 4.61 Kyu 10 win 16 lose .384
2020 /09 4.24 Kyu 22 win 28 lose .440
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