(;GM[1]FF[4]SZ[19]
GN[Black first]
PC[http://senseis.xmp.net/?BeginnerExercise123/Solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?BeginnerExercise123/Solution

Black first]
PL[B]

AB[jf][gg][hg][ig][kg][mg][gh][kh][mh][fi][mi][fj][mj][fk][gk][hk][lk][mk][il][jl][hm][km][lm][mm]
AW[hh][ih][jh][gi][ii][ki][li][gj][hj][lj][ik][kk][kl]

;B[jj]C[B1]MN[1]
;W[jk]C[W2]MN[2]
;B[ij]C[B3]MN[3]
;W[hi]C[W4]MN[4]

;
)
