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

White connects in sente]
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]

;W[be]C[W1]MN[1]
;B[ad]C[B2]MN[2]

;
)
