(;GM[1]FF[4]SZ[19]
GN[Gaining forcing moves]
PC[http://senseis.xmp.net/?Sacrifice]AP[GoWiki:2009]
DT[2010-11-07]
C[Diagram from http://senseis.xmp.net/?Sacrifice

Gaining forcing moves]
PL[B]

AB[dn][gn][ho][dp][hp][gq][gr]
AW[fp][gp][ip][kp][fq][hq][iq]

;B[fr]C[B1]MN[1]
;W[eq]C[W2]MN[2]
;B[er]C[B3]MN[3]
;W[dq]C[W4]MN[4]
;B[cq]C[B5]MN[5]
;W[dr]C[W6]MN[6]
;B[cr]C[B7]MN[7]
;W[es]C[W8]MN[8]
;B[fo]C[B9]MN[9]
;W[hr]C[W10]MN[10]

;
)
