(;GM[1]FF[4]SZ[19]
GN[Clamping and sacrifice tactics]
PC[https://senseis.xmp.net/?44PointLowApproachHighExtensionInvasion]AP[GoWiki:2009]
DT[2020-04-23]
C[Diagram from https://senseis.xmp.net/?44PointLowApproachHighExtensionInvasion

Clamping and sacrifice tactics]
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[kc]C[B1]MN[1]
;W[kd]C[W2]MN[2]
;B[mc]C[B3]MN[3]
;W[md]C[W4]MN[4]
;B[oc]C[B5]MN[5]
;W[nb]C[W6]MN[6]
;B[nd]C[B7]MN[7]
;W[ne]C[W8]MN[8]
;B[od]C[B9]MN[9]
;W[jc]C[W10]MN[10]

;
)
