Single Comment

I'm glad you got the move borrowing fixed, but there is one small problem. When a piece borrows from another piece that has a borrowing move in the same vector as the vector that the piece is using to borrow the move from, the diagram takes unusually long to render the move when the piece is selected and gets stuck in a frozen position when you try to move it.

For example, lets say that a piece with the move RbxW is directly behind a piece with the move sRfR2bxW. Notice that both have the bxW for borrowing moves. If I click the piece in front and then try to move it, the diagram will freeze.

I think what is happening is that when a piece with x on a final leg borrows a move, it always borrows all the moves of the piece it's borrow from, including borrowing moves. Since the pieces in the example above have the same borrowing move (bxW), when the piece in front borrows the move of the piece in the back, the diagram will generate that move on top of the original, but since the borrowed move included the same borrowing move as the original move and neither piece had moved, the diagram will repeat this procedure over and over, resulting in an infinite loop.

Fortunately, the fix for this little problem is simple. Either don't include any move with x on a final leg when adding the borrowed move to the original, or include an additional condition in the loop for generating moves that prevents the infinite loop.