(;GM[1]FF[4]SZ[19]
GN[Black attacks]
PC[http://senseis.xmp.net/?QuadrupleKoFight]AP[GoWiki:2009]
DT[2010-03-30]
C[Diagram from http://senseis.xmp.net/?QuadrupleKoFight

Black attacks]
PL[B]

AB[fh][gh][hh][ih][jh][kh][lh][mh][nh][fi][hi][ji][li][ni][ej][gj][ij][oj][ek][ok][el][fl][gl][hl][il][jl][kl][ll][ml][nl][ol]
AW[eg][fg][gg][hg][ig][jg][kg][lg][mg][ng][og][eh][oh][ei][ki][mi][oi][fj][hj][jj][lj][nj][fk][gk][hk][ik][jk][kk][lk][mk][nk]

;B[kj]C[B1]MN[1]
;W[gi]C[W2]MN[2]
;B[mj]C[B3]MN[3]
;W[ii]C[W4]MN[4]

;
)
