(;GE[endgame]DI[3d]DP[11]SO[Eryth]CO[0]C[다음 수는 어디일까요?]AB[ra]AB[rb]AB[rc]AB[qd]AB[pd]AB[nd]AB[od]AB[me]AB[le]AB[kd]AB[kc]AB[kb]AW[lb]AW[lc]AW[ld]AW[nc]AW[oc]AW[pc]AW[qb]AW[qa]AB[ib]C[]AP[goproblems];B[pb];W[mb]C[See variations why white has to answer here];B[qc];W[ob];B[pa];W[md];B[oa];W[na])