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Referenced by
ButterflySeven
BigEyeLiberties
AStaticTreatiseOn...
UnsettledEyeshapes
TheEmptyTriangleI...
FarmerSHatEyeSpace
KanazawaSolution41
KanazawaSolution31
KanazawaSolution36
BeginnerExercise3...
GoTerms
KanazawaSolution11
35PointLowApproac...
ChineseGoTerms
July28Solution2
KanazawaVariations46
BQM42
AttritionMethodAp...
KanazawaProblem20...

 

Farmer's Hat
Path: KillingShapes   · Prev: SquareFour   · Next: BulkyFive
  Difficulty: Beginner   Keywords: Shape, Go term

[Diagram]
The farmer's hat

The farmer's hat is a bad shape, for the same reason that the empty triangle is bad. You can think of this shape as two empty triangles.

The liberty at a (and similarly for b) is inefficient (see The Empty Triangle is Bad page for more detail).

If White plays at a or b, it actually would improve Black's shape. If both points are filled then the shape is really good.


[Diagram]
Very bad shape for Black

In situations like this, the farmer's hat is really ridiculous.

The marked stone has to be at a.


[Diagram]
Black cannot cut at 'a'.

Black's bad shape allows White to play W1. Black cannot cut at a. Furthermore the circled point is a false eye.



Phlegmatic: One good use for the Farmer's Hat (continuing the Killing Shape discussion):

[Diagram]
The Farmer's Hat as Killing Shape.

By playing at the marked point, White will be killed when Black plays at B1 in the subsequent diagram, so White is dead.


[Diagram]
White is dead.


I've heard this also called the Soldier's Helmet. -- BlueWyvern

I've also seen Napoleon's Hat -- Nico

It is often mentioned as the "pyramid" too -- ddom

Yes, in Holland we use the term "pyramid".


Perhaps we might divide this page into FilledFarmersHat?, EmptyFarmersHat? and FarmersHatAsAKillingShape?? -- Dieter

Deebster: Is there enough content to justify that? It's a pretty short page as is...



Path: KillingShapes   · Prev: SquareFour   · Next: BulkyFive
This is a copy of the living page "Farmer's Hat" at Sensei's Library.
(OC) 2003 the Authors, published under the OpenContent License V1.0.