Lots of impossible 3x3 patterns

your pattern expansion for the 3x3 patterns you end up with a lot of patterns that have one or two blanks or that have blanks that aren't 3 on an edge.

[pasky]

Can you given an example, and explain why is coming up with impossible patterns an issue anyway?

Here is a commit that eliminates the impossible patterns..

#11

I'm working on a replication of AlphaGo, and one of the features is the 3x3 patterns.

An example of an impossible pattern might be

"Xx x.x x " #cut 1 pattern unprotected cut