(;GM[1]FF[4]SZ[19]
GN[Attaching under - black gets a base, but white is strengthened]
PC[http://senseis.xmp.net/?BQM521]AP[GoWiki:2009]
DT[2011-02-22]
C[Diagram from http://senseis.xmp.net/?BQM521

Attaching under - black gets a base, but white is strengthened]
PL[B]

AB[iq][lq]
AW[no][gq][nq]

;B[gr]C[B1]MN[1]
;W[fr]C[W2]MN[2]
;B[hr]C[B3]MN[3]
;W[fq]C[W4]MN[4]

;
)
