(;CA[utf-8]GM[1]AB[pq][or][qr][fb][ib][jb][kb][ge][fc][gc][hc][kc][lc][pc][ed][hd]
[ec][ie][ke][qe][if][ig][qh][qk][so][cp][dp][qp][rp][fq][iq][oq]AW[me][hf][gf][db]
[eb][lb][dc][jc][mc][nc][dd][fd][gd][jd][kd][ld][de][ee][fe][mg][dj][rm][cn][io]
[mo][qo][ro][op][pp][kq][nq][nr]PL[W]C[Basic position Black to play
The question is about 
Where is the invasion point in white left side moyo]
AP[Drago:4.01]SZ[19]FF[4]MULTIGOGM[1]

(;B[cl]LB[cj:A][bj:B][dl:C]C[This is a standard invasion, White can answer with A, B, C. ])
(;B[ch]C[If black invade here the white plan will be to push the black stone to the white wall]
;W[ci];B[dh];W[fi]LB[cl:A]C[Now is  difficult for black to invade at A])
(;B[cg]LB[dh:A][eh:B][cl:C]C[This is too close to the white wall, White A and B 
try to capture the black stone on large scale but dosen't defend against Black C. ]
(;W[ci]LB[cl:A]C[Use the wall to attack and defend against A. Black is almost capured])
(;W[dh];B[bj];W[bh];B[cl]C[Good result for black])))