(;AP[goproblems]AB[br]AB[bq]AB[bp]AB[bo]AB[co]AB[dn]AB[en]AB[fn]AB[gn]AB[go]AB[fq]AB[gq]AB[hq]AB[hr]AB[hs]AW[do]AW[eo]AW[fo]AW[fp]AW[cp]AW[cq]AW[cr]AW[dq]AW[eq]AW[fr]AW[gr]C[12. White dies](;B[cs](;W[ds];B[er];W[es](;B[gs]LB[cs:1]LB[ds:2]LB[er:3]LB[es:4]LB[gs:5]C[There is death in the hane, as the saying goes. If White responds at 2, Black 3 and 5 do him in. RIGHT])(;B[fs]C[RIGHT]))(;W[es];B[gs];W[ds];B[er]LB[cs:1]LB[es:2]LB[gs:3]LB[ds:4]LB[er:5]C[If White responds with 2 here, Black plays the same combination in reverse, RIGHT]))(;B[er];W[es](;B[fs];W[dr];B[gs];W[cs];B[er];W[fr];B[gr];W[er]C[CHOICE])(;B[gs];W[dr];B[fs];W[cs];B[er];W[fr];B[gr];W[er]C[CHOICE]))(;B[gs];W[er](;B[ds];W[cs])(;B[cs];W[ds]))(;B[fs];W[er](;B[cs];W[ds])(;B[ds];W[cs](;B[gs];W[es])(;B[es];W[gs])))(;B[gp];W[er](;B[ds];W[cs])(;B[cs];W[ds]))(;B[ep];W[er](;B[ds];W[cs])(;B[cs];W[ds])(;B[gp];W[dp](;B[ds];W[cs])(;B[cs];W[ds]))))
