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

Solution is approach ko.]
PL[W]

AB[bb][fb][dc][fc][gc][ic][jc][bd][ce][ee][fe][ie][cf][df][hf][fg]
AW[cb][db][ec][cd][dd][ed][fd][gd][hd][de]

;W[bc]C[W1]MN[1]
;B[ac]C[B2]MN[2]
;W[ab]C[W3]MN[3]
;B[cc]C[B4]MN[4]
;W[ba]C[W5]MN[5]
;B[aa]C[B6]MN[6]

;
)
