(;GM[1]FF[4]SZ[19]
GN[also ko]
PC[https://senseis.xmp.net/?GokyoShumyoSection2Problem39/Solution]AP[GoWiki:2009]
DT[2023-01-07]
C[Diagram from https://senseis.xmp.net/?GokyoShumyoSection2Problem39/Solution

also ko]
PL[W]

AB[ca][da][fa][ha][ja][bb][gb][hb][jb][kb][cc][ec][lc][cd][ed][kd][ce][ge][he][jf]
AW[ia][cb][db][eb][ib][fc][gc][hc][ic][jc][hd][id]

;W[fb]C[W1]MN[1]
;B[ga]C[B2]MN[2]
;W[ab]C[W3]MN[3]
;B[bc]C[B4]MN[4]
;W[ba]C[W5]MN[5]

;
)
