Monthly record of yamamotos's rank (dan/kyu)
month dan/kyu win/lose win ratio
2023 /08 2.45 Kyu 14 win 12 lose .538
2023 /06 3.07 Kyu 22 win 23 lose .488
2023 /05 9.00 Kyu 1 win 1 lose .500
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