(;GM[1]FF[4]SZ[19]
GN[Example 5b: White first]
PC[https://senseis.xmp.net/?Corridor]AP[GoWiki:2009]
DT[2019-12-25]
C[Diagram from https://senseis.xmp.net/?Corridor

Example 5b: White first]
PL[W]

AB[ei][fi][gi][hi][ji][ki][li][mi][ek][fk][gk][hk][jk][kk][lk][mk]
AW[di][ii][ni][dj][ij][nj][dk][ik][nk]

;W[ej]C[W1]MN[1]
;B[mj]C[B2]MN[2]
;W[jj]C[W3]MN[3]
;B[kj]C[B4]MN[4]

;
)
