The bet, which won him dinner for four, was regarding the existence and mass of the top quark, an elementary particle discovered in 1995.
The bet was made 10 years after the discovery of the quark.
There is no mention when the bet was made
( z1 bet :time ( z2 after :op ( z3 discover :ARG1 ( z4 quark ) ) :quant ( z5 temporal-quantity :quant 10 :unit ( z6 year ) ) ) )