Given a subscheme X of ℙn1x...xℙnm this method computes [X] in the Chow ring of ℙn1x...xℙnm.
R=makeProductRing({6})
x=gens(R)
J=ideal(x_0*x_2-x_4*x_5)
clX=chowClass(J,Strategy=>"prob")
clX2=chowClass(J,ring(clX))
clX==clX2