(;GM[1]FF[4]SZ[19]
GN[Black invades]
PC[http://senseis.xmp.net/?ValueOfAnInvasion]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?ValueOfAnInvasion

Black invades]
PL[B]

AB[lo][mo][no][oo][po][kp][lp][pp][qp][kq][oq][qq][rq][kr][rr][ks][ls][rs]
AW[mp][np][op][lq][mq][pq][lr][or][pr][qr][ms][qs]

;B[ns]C[B1]MN[1]
;W[os]C[W2]MN[2]
;B[mr]C[B3]MN[3]
;W[nq]C[W4]MN[4]

;
)
