After a womanising snowboarder tricks a vengeful witch into sleeping with him by making outlandish promises, she curses him and the only cure is to fulfill every one of his deceptive vows.

lol, you beat me to it Valentin, The Witch should be the mother of the girl he tricks into bed :)

When a womanising snowboarder sweet talks a naive gypsy virgin into bed, his victim's mother, a powerful witch curses him and the only way to lift it is to convince her daughter to marry him and stay faithful to her for a full year.

So, it's outlandish promises, now, instead of threats of self-destructive acts per version 1.0? If so, that makes more sense.

But I do have a problem with the lack of specificity. What was the nature of the vows? Did he make them to her, that is, was she to be the beneficiary? Why else would she fall for the con? Why else would she respond so strongly to his failure to follow through?

I presume the guy is the protagonist but I gotta wonder: what kind of witch would fall for the bait? What character flaw of hers did his con hook into? As a character, I find her more interesting than the guy. Snowboarders --even womanizing ones -- are not uncommon and unique -- but a witch?

And does the plot pivot on his being a snowboarder? He's a manipulative, womanizing guy -- isn't that enough for the purpose of the logline?