(;AB[pd]AB[dd]AB[id]AB[qj]AW[pp]AW[dp]AW[qc]LB[pc:A]LB[qd:B]C[Of the two ways A and B to answer the invasion, which is best?FORCE]AP[goproblems]
(;B[pc];W[qd]LB[qe:A]C[Please keep playing on the indicated spot...FORCE];B[qe];W[re]LB[qf:A]C[FORCE];B[qf];W[rf]LB[qg:A]C[FORCE];B[qg];W[pb]LB[ob:A]C[FORCE];B[ob];W[qb]LB[nc:A]C[FORCE];B[nc]C[Black has built a strong wall that works nice with the marked stone, building up a moyo while White still has just isolated stones. It is far away enough to not be overconcentrated.RIGHT]MA[id])
(;B[qd];W[pc]C[Please keep playing on the indicated spot...FORCE]LB[oc:A];B[oc];W[ob]LB[nc:A
]C[FORCE];B[nc];W[nb]LB[mc:A]C[FORCE];B[mc];W[rd]LB[re:A]C[FORCE];B[re];W[rc]LB[qf:A]C[FORCE];B[qf]MA[qj]C[This way the wall does not work well with Blackｴs moyo at the top: it is faced towards the side stone which is now actually too close to the Black wall to be really effective. Black has already lost some of the initial advantage of playing first.]))
