The Alfred G. Vanderbilt Handicap is an American Thoroughbred horse race held annually near the end of July at Saratoga Race Course in Saratoga Springs, New York. A Grade I event open to horses age three and older, it is a six furlong sprint raced on dirt.
A six year old horse can not participate in the event
According to the statement any horse over three is allowed in the event. So a six year old horse should be able to race with the best of them. This makes my statement false. I think the model might have been tripped up by the word six, or maybe how I structured my question tripped it up.
( z0 possible :ARG1 ( z1 participate :ARG0 ( z2 horse :age ( z3 temporal-quantity :quant 6 :unit ( z4 year ) ) ) :ARG1 ( z5 event ) ) :polarity - )
(z0 / possible-01
    :ARG1 (z1 / participate-01
              :ARG0 (z2 / horse
                        :age (z3 / temporal-quantity
                                 :quant 6
                                 :unit (z4 / year)))
              :ARG1 (z5 / event))
    :polarity -)
A six year old horse can not participate in the event
z3 :quant 1
z3 :unit z4
z2 :age z3
z0 :polarity 0
z0 :ARG1 z1
z1 :ARG0 z2
z1 :ARG1 z5