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L+1 group
Path: LifeAndDeath · Prev: LGroup · Next: LongLGroup
Keywords: Life & Death
An L+1 group is an L group with a leg. The leg can be at the short side or the long side of the L shape. In both cases the group lives or dies according to who has sente. First L+1 Group
The first L+1 group lives or dies according to who has sente.
Black can live by playing on the 1-2 point as shown.
White can kill by playing hane at 1. This reduces the shape to the standard L group, which we already know is dead. Second L+1 Group
If the leg is on the other side, again the position depends on who has sente.
Now the 2-2 point is the vital point for Black.
Erock: Can Black also live by playing the 1-2 point?
Answer to Erock: Jared Beck: In "Black lives 1" black lives, and white has 3 ko threats for a later time. In "Black lives 2" black also lives, but white has 4 ko threats.
Jared Beck: If Black chooses to give up a few points, he doesn't have to suffer the burden of a fourth ko threat. Jared Beck: Please double-check this, I just looked at it briefly.
Again, reducing Black to a basic L group by a hane, kills the corner. Second L+1 Group, weak leg
The second L+1 group with a weak leg is also unsettled. White can kill at a or Black can live by playing at a.
Second L+1-group, hane
The extra hane gives some degree of security. The squared stone provides an outward escape.
The throw-in at
The attachment at
Third L+1 Group?
Hikaru79 Assuming it's White's play next, can this shape be killed? No. Only if there are white stones at a and b, White can kill with Wc, Bd, We.
Joonas Tyystjärvi: I'm quite probably missing something here, but I don't think white has even a ko threat here. After ChrisSchack: I'd be more inclined to call this a J+1 group or something, take a look at the J Group... Path: LifeAndDeath · Prev: LGroup · Next: LongLGroup This is a copy of the living page "L+1 group" at Sensei's Library. ![]() |