(;GM[1]FF[4]SZ[19]
GN[Why the diagonal response]
PC[http://senseis.xmp.net/?InvasionOfThirdLineThreeSpaceExtension]AP[GoWiki:2009]
DT[2012-09-11]
C[Diagram from http://senseis.xmp.net/?InvasionOfThirdLineThreeSpaceExtension

Why the diagonal response]
PL[B]

AB[gq][kq]
AW[iq]
LB[lo:a]

;B[hp]C[B1]MN[1]
;W[ip]C[W2]MN[2]
;B[io]C[B3]MN[3]
;W[jp]C[W4]MN[4]

;LB[lo:a]
)
