(;GM[1]FF[4]SZ[19]
GN[Threatens ko]
PC[http://senseis.xmp.net/?InsideOpponentsTerritoryProblem3/Solution]AP[GoWiki:2009]
DT[2013-11-23]
C[Diagram from http://senseis.xmp.net/?InsideOpponentsTerritoryProblem3/Solution

Threatens ko]
PL[W]

AB[rn][qo][ro][so][qp][qq][pr][rr][os][ps]
AW[qm][rm][sm][on][qn][sn][po][oq][pq][rq][mr][or][ns]
LB[pp:a][sp:b]

;W[qr]C[W1]MN[1]
;B[qs]C[B2]MN[2]
;W[sr]C[W3]MN[3]
;B[rs]C[B4]MN[4]

;LB[pp:a][sp:b]
)
