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

White can force]
PL[W]

AB[hc][jc][kc]
AW[id]
LB[lc:b][kd:a]

;W[ic]C[W1]MN[1]
;B[ib]C[B2]MN[2]
;W[jb]C[W3]MN[3]
;B[hb]C[B4]MN[4]

;LB[lc:b][kd:a]
)
