I find the internet has these translations which are "wonderful" and "ingenious". I find the latter closer to the essence of the 妙。But I think something is amiss.
妙 has the meaning of subtlety in it and has the connotation that when you understand why it's "妙" then there is the feeling satisfaction. None of these subtle aspects is captured by "ingenious".
What is some good translation of the word 妙? I am thinking in the context of playing Go/Weiqi/Baduk.
Agree - it’s hard to find a word to capture the subtle meaning of 妙. This is the beauty of Chinese. In some context, I think maybe we can also use “smart”.
There is a Go Dictionary that contains two terms that begin with 妙.
妙手 which is defined:
excellent move
and 妙着 [sic?] which is also defined:
excellent move
Here 妙 is consistently translated “excellent.”
“Clever,” might also be a option.
I play chess, so when I see a move that's particularly clever, I like to say it's beautiful. Many chess players also use this, such as Kasparov.
妙 is an adjective used to express better than expected. 妙 is composed of 女 and 少, 少女means young girl, just one 妙 means wonderful.
None of these subtle aspects is captured by "ingenious".This is incorrect, and you should ask this at English StackExchange.