Monthly record of yamatsuta's rank (dan/kyu)
month dan/kyu win/lose win ratio
2021 /05 0.12 Kyu 21 win 18 lose .538
2017 /06 6.00 Kyu 4 win 2 lose .666
2015 /10 9.00 Kyu 1 win 0 lose 1.00
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