Paco Sacco , how to play the rules are the same as regular chess except for these changes for a refresher of those rules .
Check out this video .
The object of the game is to be the first player to create a union between one of your pieces and your opponent's king pieces .
Do not capture opponents pieces .
Instead , they form unions by connecting the pieces together on the same square pieces in unions may be moved by both players .
However , each player may only move the union piece with the movement ability of the piece they control in the union .
Union pieces may not join in union with other pieces and pieces may not leave a union unless the union is taken over to take over a union .
Move a piece that isn't in a union to a union space and replace your piece in that space with the new one .
Now immediately move that freed piece to another available space using its normal movement , which may include forming a new union or taking over another union .
You can chain together as many takeover moves as you want that are available in a single turn .
However , you may not endlessly chain , an infinite loop .
You are only allowed to take over a union with your own piece .
You may not replace an opponent's piece .
Pawns can only join a union with a diagonal attack move .
If a pawn is returned to its starting first or second row , it regains its double step move .
Option on Paan is allowed like normal by creating a union on the Passover space .
A pawn already in a union may not perform on Paan .
Pawns in unions promote like normal regardless of which player moved them to their farthest row .
The king is not allowed to create unions , take over existing unions or partake in a union chain .
When you threaten to unite with your opponent's king on the next turn , whether directly or through a chain that King is in Sacco , players do not need to inform their opponent of Sacco .
If the threat of a union is inevitable , then the king is in Paco and they lose .
Castling is allowed like normal .
So long as the king isn't in Sacco passes through Sacco or ends in Sacco .
The first player to unite one of their pieces with their opponent's king wins .
If it is impossible for either player to do this , then the game ends in a draw .