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

Staircase: ladder]
PL[B]

AB[kp][gq][jq]
AW[jp][iq]

;B[ip]C[B1]MN[1]
;W[jo]C[W2]MN[2]
;B[ir]C[B3]MN[3]
;W[kq]C[W4]MN[4]
;B[hq]C[B5]MN[5]
;W[lp]C[W6]MN[6]

;
)
