(;GM[1]FF[4]SZ[19]
GN[Correct defense: Ko]
PC[https://senseis.xmp.net/?XuanxuanQijingProblem201/Solution]AP[GoWiki:2009]
DT[2023-02-04]
C[Diagram from https://senseis.xmp.net/?XuanxuanQijingProblem201/Solution

Correct defense: Ko]
PL[W]

AB[bo][co][do][dp][dq][eq][fq][cr][gr]
AW[bl][bn][cn][dn][en][eo][ep][fp][gq][hq][dr][er][fr]

;W[br]C[W1]MN[1]
;B[ds]C[B2]MN[2]
;W[cq]C[W3]MN[3]
;B[bs]C[B4]MN[4]

;
)
