A new variant could be made. Maybe called Hivemind chess.
1-You can move enemy pieces that you are attacking.
1.1-You can only move those pieces to a square you are attacking.
2-You can't attack other enemy pieces or your own pieces using a enemy piece.
3-You can't put your king in check by moving a enemy piece.
4-Win by checking the enemy king.
5-All other rules as in chess.
A minor sub-variant of this variant I made here, can be made here:
1-All rules as in hivemind chess.
2-While controlling a enemy piece you can use this piece to capture one of you own pieces, excluding the king, as long the enemy piece end into a attacked square after the capture is done.