(;GM[1]FF[4]SZ[19]
GN[Solution]
PC[http://senseis.xmp.net/?BasicLadderExercise1/Solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?BasicLadderExercise1/Solution

Solution]
PL[B]

AB[nc][qc][ne][mf][pf][lg][og][kh][nh][ji][mi]
AW[pc][oe][nf][of][mg][ng][lh][mh][qh][ki][li]

;B[od]C[B1]MN[1]
;W[pe]C[W2]MN[2]
;B[qe]C[B3]MN[3]
;W[pd]C[W4]MN[4]

;
)
