両先手
Meanings
1
double sente; move that is sente for either player
In go, a move that gives the initiative (sente) to whichever player plays it; both sides gain an advantage by taking it. Compare 両後手 (double gote).
This corner move is double sente, so whichever side plays it gains an advantage.
You should play a double-sente point early, or your opponent will take it.