(;GM[1]FF[4]SZ[19]
GN[Counter invasion]
PC[http://senseis.xmp.net/?ThicknessExample7]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?ThicknessExample7

Counter invasion]
PL[B]

AB[gb][fc][jc][qc][cd][gd][ce][qe][cf][df][gf][hf][eg][ch][eh][ci][di][ei][qo][qp][fq][nq][pq]
AW[cc][dc][ec][lc][oc][fd][de][ee][af][bf][ef][ff][ag][bg][cg][dg][gg][ah][bh][dh][qj][ck][pn][qn][po][dp]

;B[bi]C[B1]MN[1]
;W[bd]C[W2]MN[2]
;B[cn]C[B3]MN[3]

;
)
