This shape occurred in one of my games. I was playing white and played one space to the right of 1 (as it happens the game turned out OK) but I now think that white 1 shown here is a better place for W to play.
this is my first problem submitted to goproblems.com and comments from stronger players would be welcome
(;GM[1]FF[4]CA[UTF-8]AP[CGoban:2]ST[2]
PW[White]PB[Black]AW[jm][km][lm][mm][nm][jn][nn][jo][no][hp][ip][jp][np][hq][nq][hr][nr][js][ms][ns]AB[kn][ln][mn][ko][mo][kp][mp][iq][jq][kq][mq][ir][mr][ls]LB[js:1]C[W has just played 1 - where should B respond]PL[B]
(;B[lr]CR[lr]
;W[is]CR[is]
(;B[lp]LB[jr:A][ks:B]CR[lp]C[Black is alive with two points in gote - W can further reduce B to 2 points at 'A' or 'B' later - can do better])
(;B[ks]CR[ks]
;W[jr]CR[jr]
;B[kr]CR[kr]
;W[hs]CR[hs]
;B[lp]CR[lp]C[Black is alive with 2 points in gote - can do better]))
(;B[kr]CR[kr]
;W[is]CR[is]
(;B[ks]CR[ks]C[Black is alive with 4 points, in gote - can do better])
(;B[lr]CR[lr]
;W[lp]CR[lp]C[Black dies]))
(;B[ks]CR[ks]
;W[is]CR[is]
;B[jr]CR[jr]
;W[hs]CR[hs]C[RIGHT]C[B defends and retains 5 points in sente])
(;B[is]CR[is]
;W[lr]CR[lr]
(;B[ks]CR[ks]
;W[kr]CR[kr]
;B[jr]CR[jr]
;W[ks]CR[ks]
;B[lq]CR[lq]
;W[ls]CR[ls]C[Black dies])
(;B[lq]CR[lq]
;W[ks]CR[ks]
;B[kr]CR[kr]
;W[ls]CR[ls]C[Black dies]))
(;B[jr]CR[jr]
;W[ks]CR[ks]
(;B[kr]CR[kr]
;W[lr]CR[lr]
;B[lq]CR[lq]
;W[ls]CR[ls]C[Black dies])
(;B[lr]CR[lr]
;W[is]CR[is]
(;B[lp]CR[lp]
;W[hs]CR[hs]C[Black can do better])
(;B[kr]CR[kr]
;W[hs]CR[hs]
;B[lp]CR[lp]C[Black can do better]))))
