Killable eye shapes

Paths: <= Killing techniques => · <= Life and Death => · <= Shape Collection =>

Keywords: Life & Death

This page discusses all killable eyeshapes, including those where there is more than one White stone inside Black's eye space, but the position is not seki.

Positions with cutting points are not included.
Side or corner positions are not included.
Red circles indicate how White can almost fill the black eye space.
The effective number of internal liberties is included (big eyes).

The diagrams show the minimum number of internal White stones required to kill Black's group. If the shape is empty ...
- 0: ... Black's group is dead as it stands;
- 1: ... Black's group is unsettled. The player with sente will want to play at the vital point;
- 2 or more: ... Black's group is alive as it stands. (See miai and ko threat.)

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One point shapes

Number of internal points: 1
Required number of internal White stones to kill: 0
Remaining internal moves to capture: 1
Total internal liberties: 1

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Two point shapes

Number of internal points: 2
Required number of internal White stones to kill: 0
Remaining internal moves to capture: 2
Total internal liberties: 2

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Three point shapes

Number of internal points: 3
Required number of internal White stones to kill: 1
Remaining internal moves to capture: 2
Total internal liberties: 3
Other names: straight three

Number of internal points: 3
Required number of internal White stones to kill: 1
Remaining internal moves to capture: 2
Total internal liberties: 3
Other names: bent three

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Four point shapes

Number of internal points: 4
Required number of internal White stones to kill: 0
Remaining internal moves to capture: 5
Total internal liberties: 5
Other names: squared four, four in a box?

Number of internal points: 4
Required number of internal White stones to kill: 1
Remaining internal moves to capture: 4
Total internal liberties: 5
Other names: Pyramid Four

Number of internal points: 4
Required number of internal White stones to kill: 2
Remaining internal moves to capture: 3
Total internal liberties: 5
Other names: straight four

Number of internal points: 4
Required number of internal White stones to kill: 2
Remaining internal moves to capture: 3
Total internal liberties: 5
Other names: twisted four, dogleg four

Number of internal points: 4
Required number of internal White stones to kill: 2
Remaining internal moves to capture: 3
Total internal liberties: 5
Other names: bent four

(However, see bent four in the corner.)

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Five point shapes

Number of internal points: 5
Required number of internal White stones to kill: 1
Remaining internal moves to capture: 7
Total internal liberties: 8
Other names: bulky five

Number of internal points: 5
Required number of internal White stones to kill: 1
Remaining internal moves to capture: 7
Total internal liberties: 8
Other names: Crossed Five, Greek Cross

Number of internal points: 5
Required number of internal White stones to kill: 2
Remaining internal moves to capture: 6
Total internal liberties: 8

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Six point shapes

Number of internal points: 6
Required number of internal White stones to kill: 1
Remaining internal moves to capture: 11
Total internal liberties: 12
Other names: Rabbitty Six

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Problems

[ext] https://www.goproblems.com/problems/2295

Number of internal points: 6
Required number of internal White stones to kill: 2
Remaining internal moves to capture: 10
Total internal liberties: 12
Other names: Rectangular Six

(However, see rectangular six in the corner.)

Number of internal points: 6
Required number of internal White stones to kill: 2
Remaining internal moves to capture: 10
Total internal liberties: 12

Number of internal points: 6
Required number of internal White stones to kill: 4
Remaining internal moves to capture: 8
Total internal liberties: 12

Number of internal points: 6
Required number of internal White stones to kill: 4
Remaining internal moves to capture: 8
Total internal liberties: 12
(Different situation in the corner, me ari me nashi, B 2 Bomber seki)

Number of internal points: 6
Required number of internal White stones to kill: 2
Remaining internal moves to capture: 10
Total internal liberties: 12
(Different situation in the corner, me ari me nashi)

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Seven point shapes

Number of internal points: 7
Required number of internal White stones to kill: 2
Remaining internal moves to capture: 15
Total internal liberties: 17

Number of internal points: 7
Required number of internal White stones to kill: 3
Remaining internal moves to capture: 14
Total internal liberties: 17
Other names: Butterfly Seven

Number of internal points: 7
Required number of internal White stones to kill: 3
Remaining internal moves to capture: 14
Total internal liberties: 17

Number of internal points: 7
Required number of internal White stones to kill: 4
Remaining internal moves to capture: 13
Total internal liberties: 17

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An eye in the stomach

From 8 points onwards, there are no killing lumps anymore, and the stones inside the eye must (be able to) make an eye themselves, though not a real eye as we usually understand it. An example:

Number of internal points: 8
Required number of internal White stones to kill: 4

Adding a stone at any of the marked points, Black dies, as White connects at a.
If White starts to actually remove the Black stones from the board, he should not play at a, because this will turn the position into seki.

See also

Killable Eyeshapes - Introductory

Authors

GijsD
Dieter (a few additions)

Paths: <= Killing techniques => · <= Life and Death => · <= Shape Collection =>

Killable eye shapes last edited by Unkx80 on July 7, 2024 - 20:55

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