River Stud

Game Mechanics & Rules

River Stud is a five-card poker variant in which there is no dealer hand. The player receives two hole cards and three community cards are revealed sequentially across three betting streets. The player places the Ante before cards are dealt and may wager 1x-3x the Ante on each of the three streets (3rd Street, 4th Street, 5th Street). Winning hands require a pair of Jacks or better, with payouts scaling to Royal Flush at 500:1.

1. Place your Ante bet. The player receives two face-down hole cards; three community cards are placed face down.
2. The hole cards are revealed. Based on your two-card starting hand, place a 3rd Street bet of 1x-3x the Ante, or fold.
3. The first community card (3rd Street) is turned over. Based on your three-card hand, place a 4th Street bet of 1x-3x the Ante, or fold.
4. The second community card (4th Street) is turned over. Based on your four-card hand, place a 5th Street bet of 1x-3x the Ante, or fold.
5. The final community card (5th Street) is revealed, completing the five-card hand.
6. Hands of a pair of Jacks or better are paid according to the pay table; a pair of 6s through 10s pushes and all active bets are returned; anything lower loses all bets. There is no dealer hand to beat - the pay table determines all outcomes.

Optimal Strategy & Analysis

The game's three betting streets create a complex multi-decision tree. Optimal strategy is defined by expected value calculations at each street given the cards visible. Key thresholds: always raise 3x with a pair of Jacks or better at any street; always raise 3x with a pair of sixes through tens at 3rd Street; disconnected high cards can justify continuing at 3rd Street even without a pair or suited cards.

Draw classification is critical. A hand is a "premium draw" if it contains three or more cards to a straight flush, four cards to a straight, or four cards to a flush. Straight-draw raises depend on ranks and outs. "Marginal draws" - two to a straight flush with gaps, or three low-card straights - warrant 1x bets to maintain pot participation without over-investing. Disconnected high cards can justify continuing at 3rd Street.

Street-by-street EV shifts rapidly. At 3rd Street with two hole cards only, the player has seen 40% of their final hand; decision variance is high. By 5th Street with four cards visible, EV precision is near-complete and bet sizing should align tightly with the final hand completion probability. Players who over-bet at 3rd Street on marginal draws lose proportionally more to missing four- and five-card runouts.

Bankroll requirements in River Stud are substantially higher than single-round games. Maximum commitment per hand is 10x Ante (1 Ante + 3x 3rd Street + 3x 4th Street + 3x 5th Street). A losing hand at maximum bet is a 10-unit loss. A session bankroll of 100-150x Ante is recommended for players intending to use 3x bets on premium draws across all streets.

Provably Fair Verification

River Stud hand generation uses seven counter-suffixed SHA-256 hashes and a Fisher-Yates shuffle for each hand. The shuffled 52-card deck supplies the first two cards as player hole cards and the next three as community cards in street order (3rd, 4th, 5th). All five cards are determined before the hand begins; sequential reveal of community cards does not involve additional randomness draws.

Post-session verification: the player uses the revealed server seed, client seed, and nonce to reproduce the counter-based SHA-256 Fisher-Yates shuffle and reconstruct the complete card sequence. The player's two hole cards and all three community cards can be confirmed from the shuffled deck. Nonce increments per hand maintain uniqueness across sessions using the same seed pair.

Millionaire Mode is a paid $1 Royal Spades side bet that runs alongside the round; it does not reduce your main River Stud payouts. Whatever the seeded deck sequence produces in those positions is exactly what the check sees.

Millionaire Mode Technical Details

Millionaire Mode is a paid $1 Royal Spades side bet added to every round. Main-table payouts are NOT reduced. The required main wager must meet the displayed Millionaire Mode minimum.

Each round, the card sample selected for the side bet is checked. The Royal Spades are the six top spades - 9, 10, Jack, Queen, King and Ace of spades. Every distinct Royal Spade in the sample counts as one hit; a repeated rank does not count twice and printed jokers never count.

Paytable per $1 side bet: 6 hits = $1,000,000; 5 hits = $5,000; 4 hits = $325; 3 hits = $20; 2 hits = $2; 0 or 1 hits pay nothing.

The $1,000,000 prize is pre-funded and paid in a single transaction on six hits. Lower tiers pay alongside the round settlement. Royal Spades pays separately whether your main bet wins or loses.