For Tensho, long before I had the chance to learn the form I had studied a series of Chinese Short Range striking from my friend Ernest Rothrock.
When I learnt Tensho I immediately realized they were just tactical application of those techniques with the principles underlying them, specifically how one parry turns into the following strike.
In the sense today I'm only concerned with Sanchin as a superior way to disrupt an attack, and see Tensho in the same way, I find no difference in my practice.
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victor smith
bushi no te isshinryu
offering free instruction for 30 years