(;GM[1]FF[4]SZ[19]
GN[Global threat]
PC[http://senseis.xmp.net/?MiddleGameExercise4/solution]AP[GoWiki:2009]
DT[2015-08-28]
C[Diagram from http://senseis.xmp.net/?MiddleGameExercise4/solution

Global threat]
PL[B]

AB[jd][pd][de][fe][ge][ie][hf][qp][fq][oq]
AW[dc][gc][hc][gd][id][he][je][dg][cn][dp][hq]
LB[ed:b][eq:c]

;B[hd]C[B1]MN[1]
;W[pq]C[W2]MN[2]
;B[ic]C[B3]MN[3]
;W[pp]C[W4]MN[4]

;LB[ed:b][eq:c]
)
