(;GM[1]FF[4]SZ[19]
GN[B21 at ''a'']
PC[https://senseis.xmp.net/?BigSacrificeToGetAWall]AP[GoWiki:2009]
DT[2024-10-06]
C[Diagram from https://senseis.xmp.net/?BigSacrificeToGetAWall

B21 at ''a'']
PL[B]

AB[qj][pm][qm][pp][mq][pq][or][pr]
AW[qn][po][op][qp][nq][oq][nr]
CR[qn][po][qp]
LB[nm:a]

;B[oo]C[B11]MN[11]
;W[no]C[W12]MN[12]
;B[on]C[B13]MN[13]
;W[qq]C[W14]MN[14]
;B[mr]C[B15]MN[15]
;W[ms]C[W16]MN[16]
;B[mp]C[B17]MN[17]
;W[np]C[W18]MN[18]
;B[ln]C[B19]MN[19]
;W[nn]C[W20]MN[20]

;CR[qn][po][qp]
LB[nm:a]
)
