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

Black plays first]
PL[B]

AB[ar][br][cr][dr][or][pr][qr][rr][as][es][rs]
AW[er][fr][gr][hr][kr][lr][mr][nr][fs][hs][ks]

;B[ns]C[B1]MN[1]
;W[ms]C[W2]MN[2]
;B[os]C[B3]MN[3]
;W[ds]C[W4]MN[4]
;B[cs]C[B5]MN[5]

;
)
