(;GM[1]FF[4]SZ[19]
GN[The korner ko]
PC[http://senseis.xmp.net/?SnapbackProblem4/Solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?SnapbackProblem4/Solution

The korner ko]
PL[B]

AB[ea][eb][dc][fc][cd][dd][be][bf][ag][bg]
AW[ca][da][bb][db][cc][ad][bd][ae][af]

;B[ab]C[B1]MN[1]
;W[bc]C[W2]MN[2]
;B[ba]C[B3]MN[3]
;W[aa]C[W4]MN[4]

;
)
