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

White's threat]
PL[W]

AB[ca][ea][cb][eb][ac][bc][cc][dc]
AW[ba][fa][ab][fb][ec][gc][ad][bd][cd][dd][ed]

;W[db]C[W1]MN[1]
;B[da]C[B2]MN[2]

;
)
