(;GM[1]FF[4]SZ[19]
GN[easy ko]
PC[https://senseis.xmp.net/?GokyoShumyoSection3Problem72/Solution]AP[GoWiki:2009]
DT[2023-01-02]
C[Diagram from https://senseis.xmp.net/?GokyoShumyoSection3Problem72/Solution

easy ko]
PL[B]

AB[bp][cp][dq][ar][dr]
AW[bo][co][dp][ep][eq][br][er]

;B[bs]C[B1]MN[1]
;W[cs]C[W2]MN[2]
;B[cr]C[B3]MN[3]

;
)
