Grade-5 Stud8 stake: prove it once

'Grade-5 Stud8 stake: prove it once' (stud hi-lo, G5): Scoop and freeroll beat split-hope. Update both halves every upcard.

'Grade-5 Stud8 stake: prove it once' in stud hi-lo (G5): Bricks that kill your low change the math immediately.