I recall this happening in an early game, finding the correct move and feeling rather pleased with myself... :)
Little did I know how many challenges lay ahead!
(;AB[jd]AB[kd]AW[ic]AW[kc]AW[lf]AW[kg]AW[jg]AB[kf]AB[jf]AB[ie]AW[he]AW[hd]AB[hf]AW[gf]AW[jh]AB[hg]AW[gg]AW[id]AB[ld]AW[lc]AW[ih]AB[hh]AW[gh]AW[hi]AB[le]AB[mc]AB[jc]AW[jb]AW[md]AW[me]AB[nc]AW[mf]AB[ge]C[]AP[goproblems]
(;B[kb]
(;W[lb]
(;B[ib];W[ka]
(;B[gd]C[The cut at l18 is all important, and lets black live.RIGHT])
(;B[hb];W[gd])
(;B[hc];W[gd]))
(;B[mb];W[ka])
(;B[la];W[ka])
(;B[ka];W[je]
(;B[if];W[ke])
(;B[ke];W[if])))
(;W[ib]))
(;B[if];W[ib])
(;B[ig];W[ib])
(;B[gd];W[ib])
(;B[ib];W[je]
(;B[kb];W[ke])
(;B[ke];W[if])
(;B[hc];W[ke])
(;B[gd];W[ke])
(;B[lb];W[ke]))
(;B[ja];W[ib]))