I HAVE A NEW VARIANT: Unicorns, Yeehawers, and Horses.

 Horse can move just like a rook. The Horse can jump over pieces.

So it goes like this: It's normal chess. But with a twist. On the 3rd rank, your pawn promotes to a Unicorn (it's a colorful pink knight with a horn). They can go any direction, they can jump over pieces, they can take pieces, everything except going in an L-shape like a knight (simply because that is too common). They can also promote to a Yeehawer in the same rank. A Yeehawer is just a brown cowboy hat. They can move one square around them, just like the king. They can't jump over pieces, they can take pieces to promote to a Horse. A Horse can move just like a rook. The Horse can jump over pieces. That's it! I just need to know where I can make it

So it goes like this: It's normal chess. But with a twist. On the 3rd rank, your pawn promotes to a Unicorn (it's a colorful pink knight with a horn). They can go any direction, they can jump over pieces, they can take pieces, everything except going in an L-shape like a knight (simply because that is too common). They can also promote to a Yeehawer in the same rank. A Yeehawer is just a brown cowboy hat. They can move one square around them, just like the king. They can't jump over pieces, they can take pieces to promote to a Horse. A Horse can move just like a rook. The Horse can jump over pieces. That's it! I just need to know where I can make it

They can do it only if they need it

Unfortunately you can't here because chess.com's editor is more 'make fairy custom position!' than 'code it yourself'

you could try other websites or program the thing yourself