(;GM[1]FF[4]SZ[19]
GN[reason (B3 elsewhere)]
PC[https://senseis.xmp.net/?BeginnerExercise25/Solution]AP[GoWiki:2009]
DT[2024-08-27]
C[Diagram from https://senseis.xmp.net/?BeginnerExercise25/Solution

reason (B3 elsewhere)]
PL[B]

AB[bo][bp][cp][dp][ep][eq][er][gr]
AW[ap][bq][cq][dq][ar][br][dr][es]
LB[ds:a]

;B[cs]C[B1]MN[1]
;W[cr]C[W2]MN[2]
;W[bs]C[W4]MN[4]

;LB[ds:a]
)
