The non-dealer plays the first card. The players then take turns, each putting one card face up and saying the new running total.
Aces count 1, the cards from 2 to 10 count their face value, and jacks, queens and kings count 10. After each card you say the total of all the cards played so far in this count. The total may never go over 31.
If you cannot play a card without going over 31, you say “go” and do not play. Your opponent then plays on, if they can, and carries on playing cards for as long as they fit.
1 point, often called “one for last” or “one for go”. When neither player can add another card without passing 31, the player who played the last card scores it. If that last card made exactly 31, you score 2 for the 31 instead, never both.
Playing a card that makes the total exactly 31 scores 2 points.
2 points, for playing the card that makes the running total exactly 15.
9♠♠6♦♦
9 and 6: the second card makes 15, 2 points.
Playing a card of the same rank as the one just before it is a pair: 2 points. A third in a row is a pair royal: 6 points. A fourth is a double pair royal: 12 points. Only the same rank pairs: a king and a queen do not, even though both count 10.
7♥♥7♠♠7♦♦
Three sevens in a row: a pair royal, 6 points.
If the last three or more cards played make a run, you score 1 point per card. The cards can be played in any order (a 5, then a 3, then a 4 is a run of three), but no other card may come in between. Aces are always low.
5♣♣3♥♥4♠♠
Played in the order 5, 3, 4: a run of three, 3 points.
No. The ace is always low. A-2-3 is a run, but Q-K-A is not.
The count starts again from zero. The opponent of the player who played the last card leads the new count, and runs, pairs and fifteens start afresh. The play carries on until all the cards have been played.