01Deal and turn-up
Use a standard 52-card deck. Deal three cards to each player, one at a time, then turn up the next card as the deck card. Its suit matters for Jack and Deuce bonuses and for colours. If it is a Jack or Deuce, the dealer scores four points immediately. The other player begins the count, and the deal alternates.
02Mogging
Before play, both players may offer one card face down. If both agree, they exchange those cards. If either refuses, no cards change hands and the willing player scores one point. A Jack or Deuce offered in a completed exchange scores two points, or four if its suit matches the deck card. This bonus is counted only once.
03Count to 31
Starting with the player who did not deal, take turns laying one card face up and announce the running total. Aces count as 1 or 11, number cards at face value, and Jack, Queen and King as 10. The total cannot exceed 31. If you cannot play, say “Go”; your opponent can continue. A count of 31 scores one point per card in that counting series. Otherwise the player of its last card scores one point. Start a new series if cards remain.
04Scores during play
Reaching 15, 25 or 31 scores one point per card played in the current series. The latest two equal ranks score 2; three equal ranks score 9; four score 18. A run of three or more consecutive ranks also scores one point per card. For a run, cards may arrive in any order, but it must contain no repeated or unrelated rank. Aces are low in runs.
05Score the hand
After all six cards are played, each player's original three-card hand is counted together with the common deck card. Every distinct subset that totals 15, 25 or 31 scores one point per constituent card. Pairs score 2, three of a rank 9, four 18. Each Jack or Deuce in your own hand scores 2, or 4 if it matches the deck-card suit. A card already rewarded when offered is not rewarded twice. Runs do not count in the hand.
06Colours
Three cards of one colour score 2, or 3 if all three have the same suit. With the deck card, four of one colour score 4; if three share a suit, score 5; if all four share a suit, score 6 for “Costly Colours”. Count only the highest applicable colour bonus. You cannot score colours during the count to 31.