Actually that's exactly what I've been looking for :-) Although I was kinda hoping somebody would find a solution using F so I could make an F2 which doesn't allow the F barrel.
For A Day at the Races - Pick the Winner (bozutyp): xurydag For A Day at the Races - 2 Horse Race (fimigus): jegabap For A Day at the Races - Scratchings (bokedel): duxyced For A Day at the Races - Trifecta (dibugef): paxysib
Interesting puzzles again, Curly!
And very interesting solutions! (jegabap was saved with 0's instead of random crates but it works correctly)