It is stipulated in the law that playing mahjong between relatives and friends is not responsible. It will be a crime to play mahjong with unrelated people outside and win or lose a large amount. The crime of gambling is subjective and intentional, and it is for profit. That is to say, the actors gather to gamble or always participate in gambling in order to obtain money, not for entertainment. For the purpose of making profits, it does not mean that the actor must win money. As long as it is for the purpose of obtaining money, even if he fails to win or even lose money, it does not affect the subjective elements of gambling crime.
legal basis: article 33 of the criminal law of People's Republic of China (PRC), whoever gathers people to gamble or gamble for a business, shall be sentenced to fixed-term imprisonment of not more than three years, criminal detention or public surveillance, and shall also be fined. Whoever opens a casino shall be sentenced to fixed-term imprisonment of not more than three years, criminal detention or public surveillance, and shall also be fined; If the circumstances are serious, he shall be sentenced to fixed-term imprisonment of not less than three years but not more than ten years and shall also be fined.