(;GM[1]FF[4]SZ[19]
GN[What can Black do?]
PC[http://senseis.xmp.net/?BQM564]AP[GoWiki:2009]
DT[2012-03-30]
C[Diagram from http://senseis.xmp.net/?BQM564

What can Black do?]
PL[W]

AB[po][qo][pp][pq]
AW[on][pn][qn][oo][op][oq]

;W[pr]C[W1]MN[1]
;B[qr]C[B2]MN[2]
;W[ro]C[W3]MN[3]
;B[or]C[B4]MN[4]

;
)
