Here is a problem taken from a game I played on the Dragon Go Server. Black tried to save the three stones I ataried with wR1... a hopeless situation ! this is my first problem here, hope you will enjoy it. any comment is welcome!
(I already modified some sequences, thanks to them!)
(;AB[qr]AB[qq]AB[pq]AB[or]AB[nr]AB[mr]AB[lr]AB[kr]AB[jr]AW[ir]AW[hs]AW[gr]AB[fs]AB[gs]AB[fr]AB[fq]AB[fp]AW[gp]AW[gq]AB[dp]AB[cn]AW[jq]AW[lq]AW[nq]AW[mq]AW[oq]AW[pp]AW[qp]AW[rq]AW[rr]AW[ko]AW[qs]C[Black just answered A to white R1, hoping to save his three stones at the right. White to kill.]AB[pr]LB[pr:A]AW[jp]AW[oo]AP[goproblems]
(;W[js];B[ks]
(;W[ps]
(;B[is]
(;W[hr];B[os];W[ms];B[rs]
(;W[qs]C[correct! Black is dead now.RIGHT])
(;W[js];B[qs]C[wrong, black has got his two eyes now!CHOICE]))
(;W[os];B[hr]C[Wrong, black is safe nowCHOICE]))
(;B[os]
(;W[ms];B[rs]
(;W[qs]C[correct! Black is dead now.RIGHT])
(;W[is];B[qs]C[CHOICE]))
(;W[rs];B[ms]C[Wrong, black is alive.CHOICE])))
(;W[is];B[ps]C[wrong, Black is alive now !CHOICE])
(;W[ms]
(;B[ps]
(;W[ns];B[is];W[hr]C[correct! black is dead now.RIGHT])
(;W[rs];B[ns]C[CHOICE]))
(;B[ns];W[ps];B[os];W[kq];B[ls];W[ms]))
(;W[ns];B[ms]C[wrong, black is alive now!CHOICE]))
(;W[ps];B[os]
(;W[js]
(;B[rs]
(;W[qs];B[ks]
(;W[ms]C[correct! Black is dead now.RIGHT])
(;W[is];B[ms]C[wrong, black has got his two eyes now!CHOICE]))
(;W[ks];B[qs];W[ls];B[ms]C[wrong, black has got his two eyes now!CHOICE]))
(;B[ks]
(;W[ms];B[rs]
(;W[qs]C[correct! Black is dead now.RIGHT])
(;W[is];B[qs]C[CHOICE]))
(;W[rs];B[ms]C[Wrong, black is alive.CHOICE])))
(;W[rs];B[js]C[Wrong, black is alive!]
(;W[ms];B[ls]C[])
(;W[ls];B[ms]))
(;W[ls];B[ms]C[wrong, black is alive now!CHOICE])
(;W[ms];B[rs];W[qs];B[js];W[ls];B[is];W[hr]C[correct! black is dead now.RIGHT]))
(;W[ms]
(;B[js]
(;W[ls];B[ps];W[ns];B[is];W[hr]C[wrong, you only get a seki now!CHOICE])
(;W[ns];B[ls]C[CHOICE]))
(;B[ps]
(;W[ns];B[js];W[ls];B[is];W[hr]C[wrong, you only get a seki now!CHOICE])
(;W[ls];B[ns]C[CHOICE]))))