(;AB[pd]C[Please follow the triangle.FORCE]TR[qf]AP[goproblems];W[qf];B[qh]C[FORCE]TR[qd];W[qd];B[qc]C[FORCE]TR[pc];W[pc]
(;B[qe];W[rd];B[od];W[qb];B[re];W[rc]C[This is possible, but obviously good for blackRIGHT])
(;B[oc];W[pb];B[qe];W[rd];B[od];W[qb];B[re];W[rc];B[pf]C[RIGHT])
(;B[qb]C[White has to be careful.]
(;W[pb];B[ob]C[Black's tesuji is too good here.];W[oc];B[od];W[nc];B[qe]C[Black's profit on the left side is too big.])
(;W[oc];B[od]
(;W[nd];B[qe];W[rd];B[re]C[And this is good for white how?])
(;W[nc];B[qe];W[rd];B[re]C[And this is good for white how?]))
(;W[od];B[pe];W[qe];B[oc];W[of];B[pb];W[pf]C[Blacks gets the corner, takes sente, and white is heavy with only potential for only one eye..])
(;W[ob];B[od];W[rb];B[rc];W[rd];B[sb];W[ra];B[qa];W[nc];B[pf]
(;W[qe];B[qg]
(;W[sd]
(;B[rf]
(;W[pb];B[pe];W[sc];B[sa]
(;W[rb]C[RIGHT])
(;W[ra]C[RIGHT]))
(;W[pa];B[sa]
(;W[pb];B[pe])
(;W[sc];B[oc]))
(;W[sc]C[RIGHT])))
(;W[pb];B[sd]C[ko])
(;W[rg]C[NOTTHIS]))
(;W[qg]C[NOTTHIS])
(;W[rg]C[NOTTHIS])
(;W[rf]C[NOTTHIS]))))