(;GM[1]FF[4]SZ[19]
GN[Black must find a ko threat]
PC[http://senseis.xmp.net/?QuadrupleKoSeki]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?QuadrupleKoSeki

Black must find a ko threat]
PL[B]

AB[ga][ka][gb][jb][kb][gc][ic][kc][gd][jd][kd][ge][ie][ke][gf][jf][kf][gg][ig][kg][gh][jh][kh][gi][hi][ii]
AW[ha][ja][la][hb][ib][lb][hc][lc][hd][id][ld][he][le][hf][if][lf][hg][lg][hh][ih][lh][ji][ki][li]
LB[ia:a]

;W[je]C[W8]MN[8]

;LB[ia:a]
)
