(;GM[1]FF[4]SZ[19]
GN[Black's sacrifice]
PC[https://senseis.xmp.net/?TakagiKatoInvasionClampAndSacrifice]AP[GoWiki:2009]
DT[2020-04-22]
C[Diagram from https://senseis.xmp.net/?TakagiKatoInvasionClampAndSacrifice

Black's sacrifice]
PL[B]

AB[lc][pd][pf][ck][ek][pl][ql][om][qm][bn][pn][qo][hp][jp][np][pp][fq][pr]
AW[ec][nc][dd][jd][ld][cf][ci][dn][qn][rn][go][ro][cp][dp][rp][qq][qr]

;B[md]C[B1]MN[1]
;W[mc]C[W2]MN[2]
;B[nd]C[B3]MN[3]
;W[le]C[W4]MN[4]
;B[oc]C[B5]MN[5]
;W[lb]C[W6]MN[6]
;B[kc]C[B7]MN[7]
;W[kb]C[W8]MN[8]
;B[ob]C[B9]MN[9]
;W[jc]C[W10]MN[10]

;
)
