(;SZ[19]AB[cl]AB[cm]AB[cn]AW[co]AW[bp]AW[dp]AW[dn]AW[dm]AW[dl]AB[dk]AB[ek]AW[ck]AB[ch]TR[ck]C[how should black deal with the marked white stone?]GM[1]FF[4]CA[UTF-8]RU[Japanese]KM[0]TM[1800,0,30,5]PW[]PB[]AE[en]AE[el]AE[em]AE[fk]AE[dj]AE[dh]AE[cj]AE[do]AE[cp]AE[ep]
(;B[cj];W[bk]
(;B[bl];W[bj]
(;B[bi]C[
white capturedRIGHT])
(;B[ci];W[bn]))
(;B[bj];W[bl]
(;B[bm];W[bn];B[am];W[an])
(;B[bn];W[bm];B[am];W[bo];B[an];W[ao])))
(;B[bk];W[cj]
(;B[bj];W[di]
(;B[eh]C[
this works for blackRIGHT])
(;B[ei];W[dh]C[black split])
(;B[dh];W[ei]C[black split])
(;B[ci];W[dj];B[eh];W[ej];B[fj];W[fk];B[el];W[fl];B[em];W[en]C[ladder]))
(;B[dj];W[bj]
(;B[bl]C[this leaves problems for black])
(;B[al];W[bn];B[bm];W[an];B[am];W[aj])))
(;B[bj];W[bk]
(;B[bl];W[cj];B[bi];W[al];B[am];W[ak];B[bn];W[ao];B[bo];W[ap];B[dj];W[an])
(;B[cj];W[bl];B[bm];W[bn];B[am];W[an]))
(;B[di];W[bk])
(;B[bn];W[bk]C[trouble for black]))