(;AB[ar]AB[br]AW[aq]AW[bq]AW[ao]AW[bo]AW[bp]AB[am]AB[bm]AB[cn]AB[co]AB[cp]AB[cq]AW[cr]AW[ds]AB[dq]AB[er]TR[cr]AP[goproblems] (;B[dr];W[bs] (;B[cs];W[ek]C[Play at K to answer White's ko threatFORCE]LB[dk:K];B[dk];W[cr];B[es];W[as];B[br] (;W[ar];B[cs]C[Both you and White have no more ko threats but it's White's turn to find one, so White dies. Congratulations!!CHOICERIGHT]) (;W[cs];B[ar]C[RIGHT])) (;B[es];W[as] (;B[br];W[ar];B[cs];W[ek]C[Play at K to answer White's ko threatFORCE]LB[dk:K];B[dk];W[ds]C[Both you and White have no more ko threats but it's your turn to find one, so White lives.]) (;B[cs];W[br]C[White lives unconditionally]))) (;B[es];W[bs];B[dr];W[as] (;B[br];W[ar];B[cs];W[ek]C[Play at K to answer White's ko threatFORCE]LB[dk:K];B[dk];W[ds]C[Both you and White have no more ko threats but it's your turn to find one, so White lives.]) (;B[cs];W[br]C[White lives unconditionally])) (;B[bs];W[cs];B[es];W[as]) (;B[cs];W[bs];B[es];W[as];B[br];W[cs];B[dr];W[ar]) (;B[bn];W[bs];B[an];W[as]))