Monthly record of sumamura's rank (dan/kyu)
month dan/kyu win/lose win ratio
2020 /10 9.00 Kyu 1 win 0 lose 1.00
2020 /09 9.00 Kyu 1 win 6 lose .142
2020 /08 6.00 Kyu 4 win 10 lose .285
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