(;GM[1]FF[4]SZ[19]
GN[When black plays contact, white gets stronger]
PC[http://senseis.xmp.net/?HowToAttack]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?HowToAttack

When black plays contact, white gets stronger]
PL[B]

AB[dd]
AW[cj]
CR[cj]
LB[di:a]

;B[ci]C[B1]MN[1]
;W[dj]C[W2]MN[2]

;CR[cj]
LB[di:a]
)
