Where should black play to put white in atari without risking his own stones?
(;AB[ma]AB[mb]AB[mc]AB[md]AB[ld]AB[kd]AB[ne]AB[nf]AB[pf]AB[qe]AB[qd]AB[pc]AB[pb]AB[ob]AW[nc]AW[na]AW[nb]AW[nd]AW[oc]AW[oe]AW[pe]AW[pd]AW[me]AW[le]AW[ke]AW[jd]AW[kc]AW[lb]AP[goproblems]
(;B[oa]C[Congratulations!!! You just put 5 white stones in atari. No matter what white does he cannot escape. RIGHT])
(;B[of]C[CHOICEFORCE];W[la]C[Ooops . . . white has just put 6 of your stones in atari, and there is no way for you to save them.FORCE]))