(;GM[1]FF[4]SZ[19]
GN[If black tries to avoid ko...]
PC[http://senseis.xmp.net/?GokyoShumyoSection3Problem77/Attempts]AP[GoWiki:2009]
DT[2011-01-06]
C[Diagram from http://senseis.xmp.net/?GokyoShumyoSection3Problem77/Attempts

If black tries to avoid ko...]
PL[B]

AB[ca][bb][db][dc][gc][hc][bd][cd][ae][ee][fe][bf][cf][df]
AW[da][ea][eb][ec][dd][ed][be][ce][de][ef][bg][cg][dg][eg]

;B[af]C[B1]MN[1]
;W[ab]C[W2]MN[2]
;B[ac]C[B3]MN[3]
;W[ag]C[W4]MN[4]
;B[ad]C[B5]MN[5]
;W[cc]C[W6]MN[6]

;
)
