Why is this move legal?


#1

Dear Go players!
Could you please tell me why is this move legal? Isn’t it a suicidal move? I’m a complete novice)

Screenshot

Thanks a lot!


#2

It’s not a suicidal move - it captures opposing groups, which gives it the liberties it needs.


#3

That move is legal because it is the last liberty of the two black groups. You need at least two eyes in a group in order to make that group alive. A4 in that example, is referred to as a false eye. So the black group had zero eyes, and the reason why white could kill everything.


#4

Thank you! Go is amazing!


#5

Here’s also some resources that may help you.
For an overall resource for life and death https://senseis.xmp.net/?LifeAndDeath
two eyes: https://senseis.xmp.net/?TwoEyes
false eyes: https://senseis.xmp.net/?FalseEye


#6

This series is great: https://online-go.com/puzzle/2312

This page describes your situation: https://online-go.com/puzzle/2318

The pages leading up to it give you the basics you need to understand that.