(;GM[1]FF[4]SZ[19]
GN[Descent follow-up (W6 error)]
PC[http://senseis.xmp.net/?XuanxuanQijingProblem2/Solution]AP[GoWiki:2009]
DT[2013-04-01]
C[Diagram from http://senseis.xmp.net/?XuanxuanQijingProblem2/Solution

Descent follow-up (W6 error)]
PL[B]

AB[eb][bc][cc][dc]
AW[bb][cb][db][fb]

;B[ea]C[B1]MN[1]
;W[ec]C[W2]MN[2]
;B[fc]C[B3]MN[3]
;W[ed]C[W4]MN[4]
;B[gb]C[B5]MN[5]
;W[da]C[W6]MN[6]
;B[fa]C[B7]MN[7]

;
)
