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

Long threat]
PL[B]

AB[lg][fi][ji][ki][li][gj][jj][fk][ik][fl][hl][il][fm][gm][km][hn][in][jn][kn]
AW[if][ih][jh][ii][hj][kj][mj][gk][hk][kk][mk][gl][jl][hm][im][jm]

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

;
)
