(;GM[1]FF[4]SZ[19]
GN[White to play]
PC[http://senseis.xmp.net/?DroppingBackProblem1]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?DroppingBackProblem1

White to play]
PL[W]

AB[bb][cb][db][ac][cc][bd][dg][eg][gg][eh][di][gi][bj][dj]
AW[eb][dc][ec][cd][gd][id][ae][ce][ee][df][ch][dh][ei][ej][ck][dk][ek]
CR[di][bj][dj]


;CR[di][bj][dj]
)
