(;AB[pd]AB[pp]AB[cn]AB[cq]AW[dp]AW[cl]AW[dd]C[Which way is better for you to play?FORCE]LB[cp:A]LB[dq:B]AP[goproblems] (;W[cp];B[dq]LB[ep:A]C[(B3 also possible..)];W[ep];B[bp]LB[bo:A];W[bo];B[bq]LB[co:A];W[co];B[fq]C[Well done ;) (Often left like this, possible continatios marked..)RIGHT]LB[dn:a]LB[go:b]LB[gp:c]) (;W[dq];B[cp]LB[do:B];W[do];B[bn]LB[em:B];W[em];B[jq]C[(B4 also payable for black) The white wall is somewhat wasted! Black gets more this way. This sequence is better if white has somethin in the direction which the new create thickness faces! See problem 808 by unkx for such a case.]))