4 players, each dealt 13 cards from a standard 52-card deck. Whoever holds ♦3 leads first; their first play MUST include the ♦3.

Card order: Rank low → high: 3 < 4 < 5 < 6 < 7 < 8 < 9 < 10 < J < Q < K < A < 2. Suit low → high: ♦ < ♣ < ♥ < ♠. Ties on identical rank are broken by suit.

Play: Each turn: play a legal hand that beats the active trick (same size, higher power) or pass. Hand sizes allowed are 1, 2, 3, or 5 cards only — there is no 4-card hand. After everyone else passes consecutively, the trick clears and the last player to play leads next with any size. First to empty their hand wins the round.

Legal hands:

• Single — any card
• Pair — two of the same rank
• Triple — three of the same rank
• Straight (順子) — five consecutive ranks (no wrap; 2 cannot top a straight)
• Flush (同花) — five of the same suit, non-consecutive
• Full house (俘虜) — three of a kind + a pair
• Four of a kind (四條) — four + 1 kicker
• Straight flush (同花順) — five consecutive same-suit (highest 5-card power)

5-card power (low → high): straight < flush < full house < four-of-a-kind < straight flush. A higher-power 5-card hand beats a lower-power one regardless of card values.

Scoring: Each loser pays a penalty of cards-left × multiplier:

• 0–7 cards left — × 1
• 8–9 cards left — × 2 (大相)
• 10–12 cards left — × 3 (大大相)
• 13 cards left (no card ever played) — × 4 (全相)

Winner collects the sum of all loser penalties. Each round is independent — scores reset when a new round starts.

Redeal (重新派牌): A hand with exactly 2 face cards (J / Q / K), 0 aces, and 0 twos — 「雙公無煙Dee」— has near-zero winning odds. The holder may call a redeal before the first play; if accepted, all four hands are reshuffled while keeping the round number.

Match structure: Each match is one or more independent rounds. After a round finishes, the host may start the next round with whichever seats are filled (refill AI as needed). The lifetime leaderboard tracks finishing positions per player across all matches (🥇 🥈 🥉 4️⃣).