(;GM[1]FF[4]SZ[19]
GN[Infinite ko threats (W4 at WC)]
PC[https://senseis.xmp.net/?DoubleKo]AP[GoWiki:2009]
DT[2024-10-13]
C[Diagram from https://senseis.xmp.net/?DoubleKo

Infinite ko threats (W4 at WC)]
PL[B]

AB[ba][oa][cb][db][eb][ob][pb][dc][fc][qc][bd][cd][qd][rd][ae][ce][se][bf][cf][qf][rf][ag][dg][eg][og][pg][qg][ch]
AW[pa][ra][ab][bb][qb][sb][bc][cc][ec][rc][sc][ad][dd][de][fe][df][ff][sf][bg][cg][rg][sg][ah][bh][ph][qh][ci][ri]
CR[pa]

;B[qa]C[B1]MN[1]
;W[af]C[W2]MN[2]
;B[ac]C[B3]MN[3]

;CR[pa]
)
