(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[0.00]
PB[Black to play]AW[en][fn][do][go][dp][gp][cq][fq][cr][fr]AB[cm][em][fm][gm][dn][hn][co][ho][cp][hp][bq][gq][br][gr][hr]C[This is the problem position. Black to play.]
;B[er]C[This is the correct move - it catches white in damezumari
(liberty shortage).]
(;W[fs]C[If White stops the connection to the right...]
;B[ds]C[... then this is the shape move that ensures
black links out to the left.]
(;W[cs]
;B[dq]
;W[eq]
;B[bs]
;W[dr]
;B[dq]C[The white square needs two moves to make two eyes.])
(;W[eq]
;B[cs]
(;W[dr]C[This is self-atari.]
;B[dq]C[White is dead.])
(;W[es]
;B[dr]
;W[dq]
;B[bs]C[Black just connects - white is dead.])))
(;W[ds]C[This is the hard move for black to handle.]
;B[fs]C[He starts with the edge connection threat.]
;W[es]
;B[fp]C[But this move is atari.]
;W[eq]
;B[ep]C[And this also is atari.]
;W[dr]C[This makes 1 eye on the edge...]
;B[gn]C[... but white is caught in damezumari at the top
so cannot make an eye here.]
;W[fo]
;B[eo]))
