The rules and playing methods of Mahjong are as follows:

The basic card types of Mahjong include: tube, strip, ten thousand, east, south, west, north, middle, hair, white, plus In spring, summer, autumn and winter, there are one card each of plum, orchid, bamboo and chrysanthemum, and two white stones, a total of 146 cards. The five standard states of mahjong are "eating", "bumping", "gang", "listening" and "hu".

If the upper player plays a card that exactly forms a straight with the lower player's card, he can take it. Someone else plays a card, and if he has two identical cards in his hand that exactly form a set, he can touch them. Others play a card, and you have three identical cards in your hand, which is a kong card, called an open kong. You fall down this kong, then grab a card at the end of the row and play out the unnecessary card in your hand.

There are three identical cards in the hand, and another identical card is drawn, which is called a concealed kong. No one knows what card it is, and then another card is drawn at the end of the row. The required card is played. "Open Kong" has priority over "Picking". If the card you want to Kong happens to be the card that the player who played the card wants to capture, then the Capture card will fail and the Kong card will succeed.

When you have compiled all the cards in your hand into useful cards, you only need to add the last one to make the draw, and you can enter the stage of listening. You cannot eat after listening. Peng, Kong, and only the cards drawn in this round can be played.

Score calculation:

There are a total of 14 mahjong cards, m and n coefficients, AAA represents the same three, and ABC represents three consecutive ones. DD means two identical ones. So the way to draw cards is to add DD when m=0, n=4.

Or add DD when m=1, n=3, or add DD when m=2, n=2, or add DD when m=3.n=1. Whoever draws the cards first among the four players wins, and the score is multiplied by the base score.