(;GM[1]FF[4]SZ[19]
GN[If White plays 1  at ''a'']
PC[http://senseis.xmp.net/?BQM5]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?BQM5

If White plays 1  at ''a'']
PL[W]

AB[en][pn][eo][ep][jp][np][qp][dq][mq][oq][pq][lr][nr][pr][os]
AW[dm][dn][do][lo][no][oo][op][cq][lq][cr][mr]

;W[mp]C[W1]MN[1]
;B[kq]C[B2]MN[2]
;W[nq]C[W3]MN[3]
;B[ms]C[B4]MN[4]

;
)
