(;GM[1]FF[4]SZ[19]
GN[W1 allows black to make ko.]
PC[http://senseis.xmp.net/?TsumegoFromGames81/Solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?TsumegoFromGames81/Solution

W1 allows black to make ko.]
PL[W]

AB[db][eb][gb][ec][fc][kc][bd][dd][ed][ce][bf][df][ef][cg]
AW[cb][hb][cc][dc][gc][cd][fd][gd][de][ee][fe][le]
CR[fd]
LB[ff:t]

;W[fa]C[W1]MN[1]
;B[ca]C[B2]MN[2]
;W[ba]C[W3]MN[3]
;B[ea]C[B4]MN[4]

;CR[fd]
LB[ff:t]
)
