(;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 26 which is the problem position. These do not represent a game sequence!]
;B[ps]
;W[qr]
;B[pr]
;W[qq]
;B[pq]
;W[rr]
;B[qp]
;W[rp]
;B[ro]
;W[sq]
;B[qo]
;W[pp]
;B[op]
;W[po]
;B[nq]
;W[oo]
;B[pn]
;W[qm]
;B[]
;W[rm]
;B[]
;W[pl]
;B[]
;W[nl]
;B[]
;W[mm]C[This is the problem position. Black to play.]
(;B[no]C[This is atari...]
;W[on]
;B[om]
;W[nn]
;B[mn]
;W[nm]C[But clearly the ladder does not work.])
(;B[on]C[Black can push out this way]
;W[no]
;B[nn]
;W[mo]
;B[mn]
;W[qn]
;B[lo]
;W[so]
;B[mp]
;W[rn]C[But loses 3 stones on the edge or worse.])
(;B[nn]C[This the correct move - it's a type of net.]
(;W[no]
;B[mo]
;W[np]
;B[mp]
;W[oq]
;B[on]C[This way white quickley runs out of liberties])
(;W[np]
;B[no]
;W[oq]
;B[on]
;W[op]
;B[mp]
;W[or]
;B[nr]
;W[os]
;B[ns]C[Even if white plays the atari and captures one stone
he still gets them all lost.])
(;W[on]
;B[om]
;W[no]
;B[mo]
;W[np]
;B[mp]C[Pushing through loses another liberty so white
dies even quicker.])))
