Black thought his group was safe and ignored white's move at A. Now white has played the marked stone, help black resolve this situation.
Note that black has no ko threats.
(;AB[es]AB[fs]AB[fr]AB[gr]AB[gq]AB[hq]AB[ip]AB[jp]AB[ko]AB[lo]AB[lp]AB[lq]AB[mq]AB[mr]AB[ms]AW[ds]AW[dr]AW[er]AW[eq]AW[fq]AW[fp]AW[gp]AW[hp]AW[io]AW[jo]AW[jn]AW[kn]AW[ln]AW[mn]AW[mo]AW[mp]AW[np]AW[nq]AW[ns]AW[nr]LB[hp:A]AW[iq]TR[iq]AP[goproblems]
(;B[ir];W[jq]
(;B[jr];W[kp];B[kq];W[jp]C[NOTE: White's last move is gote and is only worth 1.5 points so normally such moves would wait.RIGHT])
(;B[kp];W[jr]
(;B[hs];W[ls]
(;B[kr];W[ks];B[is];W[js])
(;B[lr];W[ks];B[is];W[js])
(;B[js];W[ks]
(;B[is];W[kr])
(;B[kr];W[is]C[No ko threats, black dies.]))
(;B[ks];W[kr];B[lr];W[js];B[is];W[ls]C[No ko threats, half the group dies.]))
(;B[js];W[ks]
(;B[is];W[hs])
(;B[ls];W[is])
(;B[kr];W[is])
(;B[kq];W[is])
(;B[hs];W[is]))
(;B[is];W[hs]
(;B[kq];W[js])
(;B[kr];W[js])
(;B[ks];W[js])
(;B[js];W[ks])
(;B[lr];W[js])
(;B[ls];W[js])
(;B[hr];W[js])
(;B[gs];W[hr])))
(;B[kq];W[jr];B[hs];W[kr]
(;B[js];W[kp];B[jp];W[ks];B[is];W[ip])
(;B[lr];W[kp])
(;B[ks];W[js]
(;B[is];W[kp];B[jp];W[lr];B[ip];W[kp];B[jp];W[ip])
(;B[lr];W[kp];B[jp];W[ip])))
(;B[kr];W[jr];B[js];W[kp];B[kq];W[hs]
(;B[is];W[jp])
(;B[jp];W[ip];B[is];W[kp])
(;B[hr];W[is];B[gs];W[is];B[hs];W[is])
(;B[gs];W[is];B[hr];W[is];B[hs];W[is]))
(;B[hs];W[ks]
(;B[kr];W[jr]
(;B[ls];W[js];B[kq];W[kp])
(;B[kq];W[kp])
(;B[kp];W[ls];B[is];W[js]))
(;B[js];W[jr];B[is];W[kp];B[kr];W[ls];B[lr];W[ks];B[ls];W[kq];B[ks])))
(;B[jq];W[ir];B[jr];W[hr];B[is];W[gs]C[Not good enough.])
(;B[jr];W[ir];B[hr];W[hs];B[jq];W[gs]C[Not good enough.]))