(;AB[pd]AB[jd]AW[qf]AB[pf]AW[pg]AB[of]AW[qe]AB[qd]AW[pe]AB[oe]C[Help Black connect the marked groups by capturing the cutting stone or by capturing the 3 whites stones.]MA[pd]MA[qd]MA[oe]MA[of]MA[pf]LB[pe:3]LB[qe:3]LB[qf:3]AW[od]LB[od:C]AP[goproblems] (;B[nd];W[oc] (;B[rd]C[threatening r13.] (;W[re]C[CHOICE];B[qg];W[rg];B[qh];W[rh];B[nc];W[pb];B[nb];W[rb] (;B[qb]C[wedjing tesuji];W[qc];B[pc] (;W[ob];B[rc];W[qa];B[oa];W[qc];B[se]C[important local Ko threat];W[rf];B[qb]C[Ko is big its very unlikely white will have enough ko threat to win this KORIGHT]) (;W[qa] (;B[ob];W[rc]C[W corner is alive but the B wall is worth more then the tiny W territory Also B get sente This is succes for BRIGHT]) (;B[rc]C[FORCE];W[ob]C[FORCE];B[qb]C[inferior Ko for black]))) (;B[pc]C[with the S16 S15 exchange all you can get is a bad koFORCE];W[ob]C[FORCE];B[qb]C[FORCE];W[qa] (;B[qc]C[so bad];W[sd]C[catastrophic result for black]) (;B[rc]C[inferior Ko for blackFORCE];W[sd]C[FORCE];B[oa]C[FORCE];W[qc]C[inferior Ko for B]))) (;W[qg];B[nc];W[pb];B[nb];W[rb] (;B[ob];W[pc];B[qb]) (;B[pc];W[ob];B[qb];W[qa];B[qc];W[pa];B[ra]C[Classic tesuji to remove 1 liberty];W[sa];B[na];W[re];B[oa];W[sd];B[ra]C[RIGHT]))) (;B[nc]C[miss the vital point.];W[rd];B[ob];W[rc];B[pc]C[white has trimmed the corner and has sente.])) (;B[oc]C[Wrong direction];W[nd]C[this is complicated but the 3 black stones are more in trouble then the whites stones.]TR[oe]TR[of]TR[pf]))