(;GM[1]FF[4]SZ[19]
GN[Black to play]
PC[http://senseis.xmp.net/?InsideOpponentsTerritoryProblem2/Solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?InsideOpponentsTerritoryProblem2/Solution

Black to play]
PL[B]

AB[sm][sn][qo][ro][qp][qq][pr][rr][ps][rs]
AW[rl][sl][rm][on][qn][rn][po][pp][pq][or][sr][os]

;B[so]C[B1]MN[1]
;W[qr]C[W2]MN[2]
;B[sq]C[B3]MN[3]
;W[qs]C[W4]MN[4]

;
)
