(;GM[1]FF[4]SZ[19]
GN[Better defense]
PC[https://senseis.xmp.net/?KyuExercise60/Solution]AP[GoWiki:2009]
DT[2024-09-24]
C[Diagram from https://senseis.xmp.net/?KyuExercise60/Solution

Better defense]
PL[B]

AB[ba][ca][ab][cb][db][eb][dc][ad][bd][cd][ae][de][ee][ef][ff][fg][gg][gh][ei][gi][ej][fj][gj][ek][al][am][bm][bn][cn][bo][do][bp][cp][dq][cr][er][es][fs]
AW[da][ea][fa][bb][fb][bc][ec][dd][ed][fd][be][ce][af][bf][df][dg][eg][eh][fh][di][fi][dj][ak][dk][bl][cl][el][cm][em][dn][eo][dp][ep][eq][gq][fr][gs]

;B[bk]C[B1]MN[1]
;W[bj]C[W2]MN[2]
;B[aj]C[B3]MN[3]
;W[bi]C[W4]MN[4]

;
)
