(;GM[1]FF[4]SZ[19]
GN[The B1 W2 exchange weakens Black follow up at ''a'']
PC[http://senseis.xmp.net/?OneTwoThreeExample5]AP[GoWiki:2009]
DT[2012-01-25]
C[Diagram from http://senseis.xmp.net/?OneTwoThreeExample5

The B1 W2 exchange weakens Black follow up at ''a'']
PL[B]

AB[fc][hc][oc][dd][oe][nf][jg][fh][ih][jh][gi][ki]
AW[jc][mc][he][je][jf][fg][hg][ig][kg][gh]
LB[eg:a]

;B[hh]C[B1]MN[1]
;W[gg]C[W2]MN[2]
;B[fi]C[B3]MN[3]

;LB[eg:a]
)
