Each card has a residue = face value mod 7. Your hand residue is the sum of card residues, mod 7. Goal: reach residue 0.
SURGE
When you HIT, if the drawn card's residue matches any card already in your hand, you surge (bust) and lose your ante. The dealer can also surge. Use the surge risk indicator to gauge your odds.
| Result | Payout |
|---|---|
| Natural Zero (2 cards) | 3:1 |
| Zero (3+ cards) | 1:1 |
| Win (lower residue) | 1:1 |
| Dealer Surge | 1:1 |
| Push (same residue) | 0 |
| Loss | -ante |
| Player Surge | -ante |
| Fold (before 1st hit) | -½ ante |
ACTIONS
DOUBLE doubles your ante, draws one card (can surge!), then auto-stands. Available before your first hit.
SIDE BETS
| Bet | Condition | Pay |
|---|---|---|
| COMP | (r₁+r₂)%7=0 | 2:1 |
| PRIME | #cards∈{2,3,5,7} | 5:1 |
| SPEC | All 4 suits | 10:1 |
| EQUIV | All same res | 8:1 |
CARD RESIDUES (mod 7)
Dealer hits on residue ≥4, stands on ≤3 (can surge). INVERT flips a card's residue to (7−r)%7, costs 1× ante.
Your balance hit zero. Time to reload.
1, 7=0, King=6. Your hand's residue is the sum mod 7.