(;GM[1]FF[4]SZ[19]
GN[White mistake]
PC[https://senseis.xmp.net/?GokyoShumyoSection5Problem19/Solution]AP[GoWiki:2009]
DT[2022-12-27]
C[Diagram from https://senseis.xmp.net/?GokyoShumyoSection5Problem19/Solution

White mistake]
PL[B]

AB[ha][fb][ib][dc][fc][ad][bd][cd][dd][ed][fd][gd]
AW[fa][ga][db][eb][gb][hb][bc][cc][ec][gc][ic][hd][be][cf][ef][gf][bg]

;B[cb]C[B1]MN[1]
;W[bb]C[W2]MN[2]
;B[ba]C[B3]MN[3]
;W[ab]C[W4]MN[4]
;B[ca]C[B5]MN[5]
;W[ea]C[W6]MN[6]
;B[ac]C[B7]MN[7]

;
)
