Life In 19x19

That situation is called a "snap-back." The rule in go is that you can play a move that would be suicide if it would capture an enemy's stone(s). If that is the case then the move is not suicide, instead the enemy's stone(s) are captured.

You can think of it like the standard ko situation ...

Hello,

So this is a basic problem for super beginners..

http://i.imgur.com/Ei8zzkl.png

The solution says to play the next black move exactly where the black stone just got captured, so black captures 4 white stones, which makes sense.

but when white played 1, what made it that it was the black ...