(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[0.00]
PB[Black to play]C[Just play through the moves to move 14 which is the problem position. 
These do not represent a game sequence!]
;B[oq]
;W[or]
;B[nr]
;W[nq]
;B[mq]
;W[np]
;B[mp]
;W[op]
;B[mr]
;W[pr]
;B[os]
;W[po]
;B[jq]
;W[qn]C[This is the problem position. Black to play.]
(;B[ps]C[The crawl is the usual edge move]
;W[qs]
;B[ns]
;W[qr]C[But only a small incursion is made.])
(;B[qs]C[This looks like a tesuji]
;W[ps]
(;B[ns]C[Black obviously can't connect here])
(;B[pq]C[Black can try this]
;W[qr]
;B[qq]
;W[rr]
;B[rq]
;W[rs]
;B[sr]
;W[rp]
;B[sq]
;W[ns]
;B[ss]
;W[sp]
;B[ms]
;W[qp]
;B[os]
;W[pp]C[But the invading black stones get captured]))
(;B[qr]C[The nose tesuji is the correct move and should
a move you think about often.]
(;W[ps]
;B[pq]C[Clearly white cannot resist])
(;W[qq]
;B[ps]
;W[pq]
;B[rr]
;W[rq]
;B[sr]
;W[sq]C[Black gets all the way into the corner.])))
