蔡政源 is qualified as Bishan Grade 4 Player now .... 碧山象棋会会员棋力分级细则 as shown in the 五周年会庆特辑 蔡政源 is qualified as Bishan Grade 6 Player (first position in under 14 Char Yong Cup in Mar 2007) before 2007 Group B Competition and Bishan Grade 4 Player after 2007 Group B Competition.