In the game of Go, this play is that of a probe. Probes usually ask the opponent to make a choice, say between inside territory or outside influence, which allows you to decide your strategy accordingly. A yosu-miru move is, in some sense, a sacrifice of a stone, but is designed to yield a very sophisticated kind of information about a developing group and how best to deal with it, based on its response. Yosu means mood, situation or the state of things, and miru is “to see”, thus “yosu o miru”, to “see how things stand”. When making a yosu-miru move, one maintains his own flexibility and options but forces his opponent to settle on a particular shape or response before he is ready to, thereby reducing his options.