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Farmer's Hat
  Difficulty: Beginner   Keywords: Shape, Go term

[Diagram]
Diag.: The farmer's hat

The farmer's hat is a bad shape, for the same reason that the empty triangle is bad.

Actually, you can think of this shape as two empty triangles.

White playing a and b reduces the liberties for the group drastically, and a black stone at a or b is wasted as he'd be better off extending up or down.



Generally the idea is alright but your explanation misses the point. If White plays at a or b she actually would improve Black's shape. If both points are filled then the shape is really good.

[Diagram]
Diag.: Very bad shape for Black

It is actually in situations like this that the farmer's hat is really ridiculous.

The marked stone has to be at a.


[Diagram]
Diag.: Black cannot cut at 'a'.

Black's bad shape allows White to play 1. Black cannot cut at a. Furthermore the circled point is a false eye.



Minor note, but I've heard this also called the Soldier's Helmet. --BlueWyvern



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