(;GM[1]FF[4]SZ[19]
GN[Approach ko (B11 at a, W12 at b)]
PC[https://senseis.xmp.net/?GokyoShumyoSection6Problem72/Solution]AP[GoWiki:2009]
DT[2023-01-22]
C[Diagram from https://senseis.xmp.net/?GokyoShumyoSection6Problem72/Solution

Approach ko (B11 at a, W12 at b)]
PL[B]

AB[cb][ib][dc][hc][ic][cd][hd][kd][fe][ge][ke][df][ff][if][jf][gg][hg]
AW[eb][hb][ec][gc][kc][lc][ed][gd][id][jd][he][ie][gf][hf]
LB[ea:b][db:a]

;B[gb]C[B1]MN[1]
;W[jb]C[W2]MN[2]
;B[ha]C[B3]MN[3]
;W[jc]C[W4]MN[4]
;B[fa]C[B5]MN[5]
;W[ja]C[W6]MN[6]
;B[ia]C[B7]MN[7]
;W[fb]C[W8]MN[8]
;B[fd]C[B9]MN[9]
;W[fc]C[W10]MN[10]

;LB[ea:b][db:a]
)
