How to calculate whether the eight characters of two people match?

Believe in yourself whether you like it or not. If the result doesn't match at all, will you not pursue it? There is some truth in eight characters, which is definitely the essence of experience summed up over thousands of years, but why not be afraid that this is the only inaccurate part? What a pity it is to lose the happiness of a lifetime because of a small mistake! People live their own lives and give up if they don't fight for it. This is not right! Come on anyway! ! !