Compare with http://goproblems.com/prob.php3?id=2622
(;SZ[19]AW[hp]AW[ip]AW[jp]AW[fq]AW[gq]AW[jq]AW[er]AB[eo]AB[fp]AB[gp]AB[cq]AB[dq]AB[eq]AB[hq]AB[iq]GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]RU[Japanese]KM[0.00]PW[White]PB[Black]
(;B[hr];W[gr]
(;B[gs];W[fr]
(;B[jr];W[is]
(;B[js];W[kr]
(;B[dr];W[ks];B[es];W[ir];B[fs];AW[be]AW[cf]AW[cg]AW[dh]AW[di]AW[cj]AW[dj]AB[cc]AB[cd]AB[ce]AB[ee]AB[df]AB[dg]AB[ch]AB[ci]LB[bh:A]C[OK, good so far, now play at A]PL[B];B[bh];W[ag]C[How do you deal with this move?]
(;B[af];W[bf]
(;B[bj];W[bk]
(;B[ai];W[ak]
(;B[bg];W[aj];B[bd]C[RIGHT])
(;B[ah];W[aj];B[bg];W[bi]C[Ko, black can do better.])
(;B[aj];W[bg];B[bd];W[ae];B[ad]C[Seki, black can do betterRIGHT])
(;B[bd]C[RIGHT]))
(;B[bg];W[ae]
(;B[ai];W[ak];B[bd];W[aj];B[ad]C[RIGHT])
(;B[ah];W[ai];B[af]C[Ko, black can do better]))
(;B[aj];W[ak];B[bg];W[ae];B[ah];W[ai];B[af];W[bi])
(;B[bl];W[aj];B[ai];W[bi]C[Ko, black can do better])
(;B[ak];W[ah])
(;B[ah];W[ae];B[bg];W[ai];B[af]C[Ko, black can do better]))
(;B[bg];W[bi])
(;B[ah];W[ai];B[bj];W[bg];B[bi];W[bk])
(;B[ai];W[bj];B[bg];W[ae];B[bd];W[bi]))
(;B[ah];W[bf]
(;B[bg];W[ai];B[af];W[bi])
(;B[bj];W[bk]
(;B[bg];W[ai];B[af];W[ae];B[bd];W[ag]C[Ko, black can do better.])
(;B[ai];W[ak];B[bg];W[aj];B[af];W[bi]C[Ko, black can do better.]))
(;B[af];W[ai];B[bj];W[bg];B[bi];W[bk])
(;B[ai];W[bj];B[bg];W[bi];B[af];W[aj]))
(;B[bj];W[ai]
(;B[bg];W[bf];B[bi];W[bk])
(;B[aj];W[bk];B[bg];W[bf];B[bd];W[ah]))
(;B[bg];W[bf]
(;B[ah];W[ai];B[af];W[bi])
(;B[bj];W[ah];B[bi];W[bk])
(;B[ai];W[bj];B[ah];W[aj]))
(;B[ai];W[bj]
(;B[ah];W[bf];B[bg];W[aj])
(;B[bg];W[bf]
(;B[af];W[bi])
(;B[ah];W[aj]))
(;B[af];W[bf];B[bd];W[bi]
(;B[ah];W[ae])
(;B[ad];W[ae]))))
(;B[hs];W[fs];B[ir];W[ks];B[dr];W[is])
(;B[ir];W[ks];B[hs];W[fs];B[dr];W[is]))
(;B[hs];W[fs];B[ir];W[kr];B[js];W[ks];B[dr];W[is])
(;B[dr];W[ir]
(;B[hs];W[fs])
(;B[es];W[hs]))
(;B[ir];W[kr]
(;B[hs];W[fs];B[js];W[ks];B[dr];W[is])
(;B[ks];W[ls]
(;B[dr];W[js];B[es];W[hs])
(;B[fs];W[js];B[hs];W[es])))
(;B[kr];W[ir];B[hs];W[fs]))
(;B[dr];W[ir])
(;B[hs];W[is];B[dr];W[ir];B[es];W[fs]))
(;B[hs];W[is]
(;B[gs];W[fr];B[dr];W[ir];B[es];W[fs])
(;B[jr];W[gs];B[ir];W[kr];B[js];W[ks];B[fs];W[is])
(;B[js];W[gs];B[ir];W[jr]))
(;B[jr];W[hs];B[ir];W[kr])
(;B[is];W[jr];B[gs];W[fr];B[dr];W[ir]))
(;B[jr];W[gr]
(;B[hr];W[hs];B[ir];W[kr])
(;B[ir];W[kr]
(;B[hs];W[hr])
(;B[hr];W[hs])
(;B[ks];W[lr];B[hs];W[hr];B[gs];W[fr];B[dr];W[is];B[js];W[ls]))
(;B[hs];W[hr];B[ir];W[kr])
(;B[is];W[hr];B[ir];W[kr];B[gs];W[fs]))
(;B[ir];W[gr]
(;B[hs];W[jr];B[gs];W[js];B[fs];W[is];B[hr];W[fr])
(;B[jr];W[kr]
(;B[hs];W[hr])
(;B[hr];W[hs])
(;B[ks];W[lr];B[hs];W[hr];B[gs];W[fr];B[dr];W[is];B[js];W[ls]))
(;B[gs];W[hr];B[hs];W[fr];B[dr];W[jr]))
(;B[gr];W[fr]
(;B[hr];W[gs]
(;B[jr];W[hs];B[ir];W[kr])
(;B[hs];W[is];B[fs];W[ir])
(;B[is];W[jr];B[dr];W[ir]))
(;B[ir];W[hs]
(;B[is];W[jr])
(;B[jr];W[kr]
(;B[gs];W[fs];B[hr];W[js])
(;B[dr];W[hr])))
(;B[jr];W[hs]
(;B[ir];W[kr];B[fs];W[hr])
(;B[is];W[gs]
(;B[ir];W[kr])
(;B[kr];W[ir]))
(;B[kr];W[ir]))))