I have a lover, I love her so
She has a special name as we all do
But I wish, from me to you, not to tell
A secret kept is a secret kept well
But if you truly want to know
I shall soon reveal her name to you
However, first, let's a game, a test
Let's see if I am, by you, get bested
Tell you what, I'll give you a puzzle Not just any one of course
It's made from chess, all normal rules apply
Though there lies a couple twists
For one, you must do the reverse
Force your opponent to win
Seems silly I know, but stick with me
Assume that they try not to win in defense
So from the position on the board
Tell two things to me and you'll win
In how many moves can White force Black to win?
And if you tell the theme, you shall have guessed my lover's name!
And to break your world perspective, please also explain the title!
CLARIFICATIONS: Seeing the number of responses that I received overnight, here are some clarifications.
The name is not a regular word and it not a chess term/terminology. It is a chess THEME.
The name is an actual one, like Morgan or Ruby, with English letters, although it is not necessarily an American one.
Solving the puzzle first will help you find the name. Within the solution, the theme is to be observed by the motion of the pieces.
Hint Regarding The Solution:
As for the selfmate’s solution, users @Firecase and @ObiObi correctly found the full solution together in the comments section: 1. Nd3+ Kc2 2. Rc5+ Kxd3 3. Qd6+ Ke4 4. Nc3+ bxc3 5. Qe5+ Kd3 6. O-O-O Rd2#