(;GE[life and death]DI[3d]DP[9]SO[marwin]CO[9]AW[rr]AW[rq]AW[qq]AW[pr]AB[pq]AB[pp]AB[qp]AB[rp]AB[po]AB[pn]AB[pm]AB[qm]AB[rm]AW[rl]AW[rk]AW[pl]AW[pk]AW[om]AW[on]AW[oo]AW[oq]AW[nq]AB[sr]C[다음 수는 어디일까요?]AP[goproblems];B[qr];W[qs]C[Right, U had to force white to choose between A or B first.CHOICE]LB[qs:A]LB[rs:B];B[sq];W[rs]C[If white doesn't want to play the ko?CHOICE];B[ro];W[sp]C[CHOICE];B[qn];W[sn];B[sm])