The idiom Hundred blows of goldsmith is comparable to one blow of iron-smith
comes from a hindi idiom "Sau sunar ki, ek lohar ki". Literal meaning is
One powerful blow is comparable to a hundred smaller blows.
The figurative meaning is
One tactic from a smart man is equal to the hundreds tactics of an idiot.
Or can be used in a fighting/boxing
One knockout is better than hundred punches.
I'm looking for another idiom or small phrase to use.
Best Answer
A nice Biblical analog is from Ecclesiasties 10:10.
Not quite along the same lines, but similar imagery to your idiom comes up in Proverbs 17:10.