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

 

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".


See also connect and die farmer's hat gives one eye in gote.


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.