Life and Death common shape rules if thumb

2nd line (edge)

8 lives

Liberties from oversided eyes

3 is 3

4 is 5

5 is 8

6 is 12

2nd line (corner)

6 lives

One space notchers (edge)

7 is seki at worst, 8 is alive

1 space notchers (corner)

5 lives

2 space notchers (edge)

7 lives

2 space notchers (corner)

6 lives, but 5 can be live/seki if you have the liberties to survive the eye-stealing tesuji

UFO shape (edge)

8 lives

6 is dead, but if the roof and one wing each have an outside liberty

UFO shape (corner)

6 lives

3 space notcher (edge)

5 and 6 are both dead/seki undecided

7 lives

3 space notcher (corner)

5 dies, 6 lives

Comb (edge)

5 lives

Fishhook status (edge and corner)

On the edge it’s dead

In the corner it is unsettled, unless it has enough liberties to push for a seki

Door shape

+1, +2, +hane, -corner(s)

Dead

Door + 1 is unsettled

Door + 2 is alive

Door + a hane is dead/seki unsettled

Not having the corners makes the shape significantly weaker

Downward dog shape?

Alive in the corner (on the 2×2) unsettled if white has an extra decent stone on the right side. It’s the tripod after defending against this push

Tripod group

Alive. Not the lack of 2nd line white stones

L group with feet

If one foot is on the ground, it is unsettled, assuming you have some sort of outside liberties.

Two feet is alive as long as you have 2+ outside liberty. If 1 liberty, it’s alive/ko. And at 0 it’s alive/dead.

L group

Dead

L group with hanes

Still dead, hanes dont help

Long L (8 field instead of 6)

Unconditionally alive if there are any outside liberties. If no outside liberties it is alive/thousand-year-ko based on sente.