Although invincible in Japan, he has never lost in challenging martial artists abroad.
But it happened that he lost to an "old man surnamed Chen" in Hong Kong.
This kind of thing, others may not be accurate, but I admit that it must be true.
It's just that he left only one sentence, "Old Chen".
As for who the old man really is and what genre he belongs to, there is no clue.
Many people take the old man's surname as Chen and beat Dashan with flexible circle movements.
I think he should be a descendant of Chen Taiji's biography.
However, this is still inconclusive.