(;AW[kr]AW[kq]AW[kp]AW[mp]AW[mq]AB[mr]AB[lr]AB[lq]AB[lp]AW[lo]AB[jo]AB[ko]AB[ip]AB[jp]AB[hp]AB[hr]AB[hq]AB[gp]AW[kn]AW[jn]AW[ho]AW[io]AW[go]AW[fp]AW[fq]AW[gq]AW[gr]AW[ln]AW[mn]AW[nn]AB[mo]AB[no]AB[on]AB[op]AB[oq]AW[fn]AB[fr]AB[er]AW[hs]MA[hs]C[White has just played the marked stone. How should black respond?]AP[goproblems]
(;B[jr];W[js]
(;B[ir];W[is])
(;B[jq];W[ks]))
(;B[ks];W[js])
(;B[js];W[ir])
(;B[is];W[gs]
(;B[jr];W[ks]
(;B[ls];W[nr])
(;B[jq]C[RIGHT]))
(;B[ir]
(;W[nr]C[]
(;B[np]C[NOTTHIS])
(;B[nq];W[ls];B[np];W[jq]C[seki]))
(;W[ls]C[CHOICE]
(;B[nr];W[jq]C[seki])
(;B[nq];W[jq])
(;B[jq];W[nr])))
(;B[ks];W[ir];B[jr];W[js]C[You didn't need to lose these points.]))
(;B[ir];W[is];B[js];W[nr]
(;B[np]C[NOTTHIS])
(;B[nq];W[gs]
(;B[ks]C[You lost too many points.])
(;B[jr];W[ks]MA[jq]MA[ls]C[Black has a shortage of liberties.])
(;B[jq];W[ks]))))