3 players · You against two AIs · One deal

Build seven groups with chi, peng, wei, pao and ti. A complete hand also needs at least 15 huxi to win.

1. 1

   Objective

   • A menzi is a group of cards. Huxi is the point value of those groups. Normally, winning requires seven groups worth at least 15 huxi. Groups usually contain three cards. If any group has four cards (ti or pao), exactly one of the seven groups must be a pair.
   • Opening exception: three four-card groups (three ti), or five identical triplets (five kan), allow an immediate heavenly win. The other cards need not form groups. Only those ti or kan contribute huxi.
2. 2

   Setup

   • Use four copies of each small and large numeral from one to ten, eighty cards in total. A random dealer receives 21 cards, the other two players receive 20 each, and 19 remain in the stock. The dealer's final card is public. Initial four-of-a-kind become ti automatically. Initial triplets are locked kan. The dealer discards first, then play follows the order You, Computer 1, Computer 2.
3. 3

   Playing a turn

   • Reveal stock cards one at a time for everyone to see. A revealed card does not go straight into the drawer’s hand. First resolve winning and meld claims. “Identical” below means the same numeral size and rank.
   • Wei and ti are mandatory: when your own revealed draw matches a pair in your hand, form a three-card wei. When it matches three identical cards in your hand, form a four-card ti.
   • Peng and pao are optional: claim a public card with two identical cards from your hand to make a peng. With three identical cards in hand, you may claim another player’s fourth card as pao. An existing wei can become pao with a fourth card from any source. An existing peng can do so only with a card revealed from the stock. You may pass instead of declaring pao.
   • You may chi only a card played by the preceding player or a card you reveal from the stock, not another player’s discard.
   • A chi can be a three-card sequence of all small or all large numerals. Two–Seven–Ten of one numeral size. Or three of the same rank with two large and one small numeral, or two small and one large.
   • Bi is an extra requirement when claiming chi: if your hand still contains copies identical to the claimed card, each copy must also form a legal chi group, exposed at the same time. If you cannot group all of them, you cannot claim chi.
   • After chi or peng, discard one card. An identical triplet held in hand, called kan, cannot be split. You cannot choose chi or peng if it would leave no legal discard. Your second and subsequent pao or ti do not require a discard.
   • If a mandatory meld leaves no card to discard and no winning hand, the hand becomes dead: for the rest of the deal it can only reveal stock cards or make pao or ti, and cannot win.
   • When several players want the same public card, resolve claims in this order: mandatory ti or wei → win → pao or peng → chi.
   • If you pass a chance to chi or peng, or previously discarded that identical card yourself, you may no longer chi or peng it later. You may still win on it.
   • Apart from an opening heavenly win, you can win only on a card publicly revealed from the stock, not on a card discarded from someone’s hand.
4. 4

   Scoring and ending

   • Huxi for identical-card groups, small/large numerals: ti 9/12. Pao 6/9. Wei or an opening kan 3/6. Peng 1/3.
   • One–Two–Three and Two–Seven–Ten score 3 huxi per all-small group or 6 per all-large group. Other sequences, mixed-size groups and pairs score 0 huxi.
   • 15–17 huxi score one tun, 18–20 score two, and every additional three huxi add one tun. Each opponent pays that amount. Exhausting the stock without a winner is a draw.