(;GM[1]FF[4]SZ[19]
GN[Black to play]
PC[http://senseis.xmp.net/?BeginnerExercise201]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?BeginnerExercise201

Black to play]
PL[W]

AB[ch][dh][eh][bi][ci][bj][cj][bk][dk][fk][dl][dm][cn]
AW[bg][cg][dg][eg][fg][bh][fh][ai][di][ei][fi][dj][ck][bm]

;W[aj]C[W1]MN[1]
;B[ak]C[B2]MN[2]
;W[cl]C[W3]MN[3]

;
)
