(;GM[1]FF[4]SZ[19]
GN[White threat I]
PC[http://senseis.xmp.net/?BeginnerExercise315/Solution]AP[GoWiki:2009]
DT[2012-11-16]
C[Diagram from http://senseis.xmp.net/?BeginnerExercise315/Solution

White threat I]
PL[W]

AB[jg][hh][jh][kh][ii][li][hj][jj][lj][hk][ik][lk][ll]
AW[jf][kf][gg][hg][ig][kg][gh][lh][mh][mi][gj][mj][gk][jk][mk][il][jl][kl][ml][gm][hm][lm]
LB[kk:a]

;W[ih]C[W1]MN[1]
;B[hi]C[B2]MN[2]
;W[kj]C[W3]MN[3]

;LB[kk:a]
)
