Basically, It's a Pick-4... BUT in this bet, all you need is you horse to SHOW in the first three legs.. You must have the winner in the last leg to cash.
I played a ticket on Saturday, here's how it went:
Gorella, Pomme Frites/Too Much Bling, Songster/Ermine/Cacique
this bet is $4 for a $1 bet.
I had it at $40 for a $10 bet.
Unfortunately, Ermine missed in the Third Leg.  The Payout ended up being $49+ per winning ticket(for a $2 bet).  I nearly had it 20x!!!  That would have been nice.  
I love this bet when there's a horse that I really like in the last leg, but don't think I'll get better than 2-1 on.  By Playing the Grand Slam, I nearly had Cacique at 24-1 to win instead of the 2-1 he went off at posttime.  That being said, I've played the Grand Slam 3-4 times so far, and have not cashed yet!!  But it's interest non-the-less.
