Life In 19x19

thanks everyone for the replies !

Drew wrote:I don't recognize that Android app. Which is it?

Hactar Go Lite

Hi, I'm a beginner and I installed an android app with go problems and solutions, one of the problems is
http://s15.postimg.org/7a24edzuv/image.jpg

white has to capture black, and one of the solutions is
http://s22.postimg.org/atatn57ot/image.jpg

please explain ...