Table of contents | Table of diagrams The J+1 group. Hane. Placement. Another placement. Endgame play. Sente. Seki. The J+1 group with descent. Tesuji. White is dead. |
The J+1 group on its own is unconditionally alive.
If makes a hane,
lives.
The placement at is answered by
.
This placement does not work either.
The usual endgame play by Black is the placement at . After
,
makes a descent, and
is the only way to gurantee unconditional life. Now
makes a throw-in, allowing
to capture a stone.
If decides to capture
, then
is sente.
If connects, then
and
makes seki. White is definitely worse off in this diagram.
When Black descends at , it changes things. To say the conclusion first,
is sente, so White needs a move at a.
The throw-in at followed by the placement at
is tesuji. The White corner becomes a bent four in the corner dead shape.
Subsequently, and
are miai, and
and
are also miai.
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