I tried to ask Chat GPT about the method my grandpa might've been using. The AI told me about Nikolai Zaharov's method, but gave me two or three or even more various calculations for his method. Of course, it wouldn't give me any source for descriptions of the method's variants. It just said the method is for fun and has no scientific merit and it pisses me off, because I'm not looking for confirmation it works, I'm looking for info how to use the method. And it won't give me anything XD When I google Zaharov's method for calculating baby's gender, it just gives me all the wrong methods and all the wrong Zaharov people
At first, it was a mix of maths and numerology, but it made the rules unclear. And it was nothing like my grandpa's method. It was about adding up numbers in birth dates and even or odd numbers. But then it made a mistake on just one example I asked to calculate (not that the result was wrong, but when describing the method, it said you look at parents' added numbers, and then it looked at the baby's, and I was like... are you dumb? you told me the other thing

).
Then, the next day, I asked about Zaharov's method. It gave me something simplified that very much looks like the Chinese gender calendar. Then I asked for more, and it gave me something that is pretty similar to what my grandpa used.
The exact Zaharov's method (according to chat GPT, which I don't think can be trusted at all...) is about people's blood changing every few years. Which is what I remember my grandpa used to say when explaining his method (except he talked about genes, not blood). In Zaharov's a woman's blood changes every 3 years while a man's every 4 years. My grandpa used to add every 3 years for a woman, but only 2 years for a man.
But I'm not sure at this point that I remember correctly.
Then everything kind of goes its separate ways between the two. GPT said Zaharov took the age of a parent at conception and divided by 3 or 4 depending on the parent. Whichever parent had younger blood at conception was most likely to determine the baby's gender.
My grandpa, however, would not consider conception at all. He would take the mom's birth date and add for every 3 years until the nearest year for when the baby comes. Same for dad, but added every two years (IF I remember correctly). Sometimes he had to account for the birth months, and in some cases even days.
And the next catch is, he considered whose genes were older, not younger. Then there was another catch with leap years, and that's what I was trying to figure out but then nothing made sense with my calculations.
So I'm thinking:
A) I remembered some detail(s) wrong from when grandpa explained his method
B) He took Zaharov's method and slightly changed or improved it?
C) Chat GPT made some shit up and now I'm confused because it won't give me any sources. If your source is just word of mouth but you're an AI and you somehow know about it, then someone must've written about it online. Give me that. It doesn't have to be scientific or medically approved. You're good enough to give me old wives' tales, but no info about one method? Shame.
D) I'll try my grandpa's method as I remember it, but with adding 4 years for the dad, not just 2, and/or other variations like taking the younger instead of older "genes".
Sorry for the text wall, I'm determined to figure out how my grandpa was always right xD
@Ashe: See, that's an interesting method but why divide by 7? Has is been explained? And what about someone who's changed their birth name (like me), I assume I'd have to take my originally given name? There's nuance to everything and I'm obsessed atm xD