The battle of Beijing for snowboarder Keiji Okamoto ended Friday with a 13th-place finish in the banked slalom event, but the Japanese Paralympic debutant departs China with his head held high and knowing how he must improve.Okamoto, a former able-bodied snowboard pro, competed in the SB-LL2 classification at Genting Snow Park in Zhangjiakou, northern China, and finished eighth in the snowboard cross event for the same class earlier in the week."To be honest with you, I am not satisfied with the result," said the 40-year-old after Friday's race in which compatriots Takahito Ichikawa finishe…READ FULL ARTICLE