(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[0.00]
PB[Black to play]AW[cl][dl][fl][em][fn][gn][do][ho][cp][fp][hp][jp][cq][fq][gq][er][jr][fs][gs]AB[bl][cm][cn][fo][go][bp][gp][bq][hq][br][cr][fr][gr][hr]C[This is the problem position. Black to play.]
(;B[eq]C[If black tries to rescue his 4 stones by playing here...]
;W[ep]
;B[dq]
;W[dr]
;B[ds]
;W[dp]C[White captures with no worries])
(;B[dr]
;W[eq]C[This black move clearly makes it too easy for white])
(;B[hs]
(;W[es]
;B[eq]
;W[ep]
;B[dq]
;W[dr]C[This sequence seem to work for black but white has erred])
(;W[dr]C[If white plays here instead of connecting black still get 
away]
(;B[es]
;W[ds])
(;B[ds]
;W[es]
;B[dq]C[White short of liberties]))
(;W[eq]C[This is the correct defense against the black move.]
;B[es]
;W[ds]C[So is there a better move for black to start with?]))
(;B[ds]C[The diagonal move is the one that connects.
This is the correct answer.]
(;W[eq]C[If white connects this time black can cut on the edge.]
;B[es])
(;W[es]C[If white connects...]
;B[eq]C[... now this move does work.]
;W[ep]
;B[dq]
(;W[dp]C[White has to atari on top]
;B[dr])
(;W[dr]C[This is self-atari.]))
(;W[dr]C[If this defense white is caught short of liberties]
;B[hs]
;W[es]
;B[dq]
;W[cs]
;B[eq])))
