Monthly record of hirotanaka's rank (dan/kyu)
month dan/kyu win/lose win ratio
2014 /10 3.19 Kyu 15 win 21 lose .416
2014 /05 4.00 Kyu 6 win 9 lose .400
2014 /04 2.54 Kyu 36 win 31 lose .537
2014 /03 3.05 Kyu 18 win 18 lose .500
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