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.
Number of internal points: 1
Required number of internal White stones to kill: 0
Remaining internal moves to capture: 1
Total internal liberties: 1
Number of internal points: 2
Required number of internal White stones to kill: 0
Remaining internal moves to capture: 2
Total internal liberties: 2
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
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
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: Farmers Hat Eyespace
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
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
Number of internal points: 5
Required number of internal White stones to kill: 2
Remaining internal moves to capture: 6
Total internal liberties: 8
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
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
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: 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
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
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, she should not play at a, because this will turn the position into seki.
See also
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