(;GM[1]FF[4]SZ[19]
GN[Black chooses 'a' 3.]
PC[http://senseis.xmp.net/?XuanxuanQijingProblem13/Solution]AP[GoWiki:2009]
DT[2013-04-01]
C[Diagram from http://senseis.xmp.net/?XuanxuanQijingProblem13/Solution

Black chooses 'a' 3.]
PL[B]

AB[aa][bb][fb][hb][ac][fc][gc][ic][jc][bd][be][ce][ee][fe][ie][cf][df][hf][fg]
AW[cb][db][gb][bc][cc][ec][hc][cd][dd][ed][fd][gd][hd][de]

;B[ga]C[B1]MN[1]
;W[eb]C[W2]MN[2]
;B[fa]C[B3]MN[3]
;W[ca]C[W4]MN[4]
;B[ab]C[B5]MN[5]
;W[ea]C[W6]MN[6]

;
)
