(;AB[qd]AB[pf]AB[qj]AB[qm]AB[ld]AW[qo]AW[pq]AW[kq]AW[ko]AW[nd]AW[oc]AW[qb]AW[id]AW[fd]AW[dd]AW[cc]AB[bd]AB[cf]AB[ci]AB[cp]AB[ep]AB[io]AB[iq]LB[nf:a]LB[dj:b]LB[cq:c]C[FORCE]AP[goproblems]
(;W[nf]C[]LB[nf:1]LB[fj:a];B[fj]LB[nf:1]LB[fj:2]LB[gl:a];W[gl]LB[nf:1]LB[fj:2]LB[gl:3]LB[el:a];B[el]C[White 3 is the deepest that white can invade, but black secures solid profit in the left with 4. However, white has failed to secure any profit with his moves.]LB[nf:1]LB[fj:2]LB[gl:3]LB[el:4])
(;W[dj]C[]LB[dj:1]LB[cj:a];B[cj]LB[dj:1]LB[cj:2]LB[dk:a];W[dk]LB[dj:1]LB[cj:2]LB[dk:3]LB[eh:a];B[eh]LB[dj:1]LB[cj:2]LB[dk:3]LB[eh:4]LB[gj:a];W[gj]C[RIGHT]LB[dj:1]LB[cj:2]LB[dk:3]LB[eh:4]LB[gj:5])
(;W[cq]LB[cq:1]))