Monthly record of file_ptr's rank (dan/kyu)
month dan/kyu win/lose win ratio
2023 /03 7.00 Kyu 3 win 6 lose .333
2022 /04 8.00 Kyu 2 win 4 lose .333
2022 /01 9.00 Kyu 1 win 2 lose .333
2021 /09 7.00 Kyu 3 win 2 lose .600
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