First those horse-like pieces are called "Knight"

Is very differcult to understand what you try to share with us without notation, so why don't you try to change a few things and write it again?

to get rooks you have to use your knight and bring him up in a up left position then move it in up right position then in a up left position to take his pawn and that will make him move his king then you take the rook

the knight you use is the one near the queen this will not work if the enemy queen has not moved because he will take your horse