Monthly record of koshihara's rank (dan/kyu)
month dan/kyu win/lose win ratio
2014 /08 3.76 Kyu 12 win 18 lose .400
2014 /07 3.54 Kyu 38 win 34 lose .527
2014 /06 4.44 Kyu 6 win 10 lose .375
2014 /04 8.00 Kyu 2 win 4 lose .333
2014 /03 9.00 Kyu 1 win 3 lose .250
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