(;GM[1]FF[4]SZ[19]
GN[(After exchanging a ko threat and a response)]
PC[http://senseis.xmp.net/?GokyoShumyoSection6Problem55/Attempts]AP[GoWiki:2009]
DT[2014-01-27]
C[Diagram from http://senseis.xmp.net/?GokyoShumyoSection6Problem55/Attempts

(After exchanging a ko threat and a response)]
PL[W]

AB[ca][ga][ia][db][eb][ib][dc][hc][dd][ed][gd][id][de][ge][gf]
AW[ea][cb][fb][gb][hb][bc][gc][cd][fd][be][ee][fe][cf][eg][gg]

;W[ec]C[W3]MN[3]
;B[ha]C[B4]MN[4]
;W[fa]C[W5]MN[5]
;B[da]C[B6]MN[6]

;
)
