(;AB[rc]AB[qd]AB[pd]AB[oc]AB[ob]AB[oa]AB[mb]AB[lb]AW[kc]AW[lc]AW[od]AW[pc]AW[qc]AW[pb]AW[pa]AW[rb]AW[re]AW[oe]AW[md]C[Black to play]AP[goproblems] (;B[rd];W[ra] (;B[sb];W[qe]C[Too slow, black cant approach]) (;B[qb];W[qa];B[sb];W[qe]C[Too slow. Black cant approach]) (;B[sc];W[sb])) (;B[sb] (;W[ra] (;B[rd];W[qe]C[Too slow, black cant approach]) (;B[sc];W[rd])) (;W[rd] (;B[sd];W[se]) (;B[sc];W[sd]) (;B[ra];W[sc]) (;B[qb];W[sc]))) (;B[qb];W[qa] (;B[rd];W[sb]C[White is alive]) (;B[sb];W[rd] (;B[sd];W[se]) (;B[sc];W[sd]))) (;B[ra];W[rd]) (;B[qa];W[qb] (;B[rd];W[ra];B[sb];W[qe]C[Too slow. Black cannot approach]) (;B[sb];W[ra];B[rd];W[qe]C[Too slow. Black cannot approach]) (;B[ra];W[sa] (;B[rd];W[qe] (;B[ra];W[qa];B[sb];W[sc];B[sd];W[pe];B[sb]C[Ko is correct. Well done.RIGHT]) (;B[sc];W[pe]C[Black cant approach]) (;B[sb];W[sc];B[sd]C[Approach Ko only. Black can do better. (You are almost there...)];W[se])) (;B[ra];W[rd]C[Black has lost everything]))))