(;GM[1]FF[4]SZ[19]
GN[Diagram 21.4: Solution]
PC[http://www.go4go.net/]
AP[GoWiki:2009]
DT[2023-12-04]
C[Diagram from http://www.go4go.net/

Diagram 21.4: Solution]
PL[B]

AB[qo][qp][pq][pr]
AW[ql][pn][qn][rn][op][pp][lq][oq][or]

;B[rr]C[B1]MN[1]
;W[rp]C[W2]MN[2]
;B[ro]C[B3]MN[3]
;W[so]C[W4]MN[4]
;B[rq]C[B5]MN[5]
;W[sp]C[W6]MN[6]
;B[sq]C[B7]MN[7]
;W[sn]C[W8]MN[8]
;B[qq]C[B9]MN[9]

;
)
