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Portal Chess

My first attempt at making some kind of Portal chess game. It's equidistant on both sides, so it's just as hard to get to the opponent no matter which way you go. Special thanks goes to MrNobodyX3 for inspiring me to make this board, and you should definitely check his version out as well :)

The rules are basically the same as regular chess. Pawns move in the directions of the arrows, other pieces can move in any particular direction. Essentially all you have to do is pretend that the two portals are continuations of the board, and as such you can check through the portals.

The dots on the edges show the starting bases, and as soon as any pawn reaches the other start point, they are eligible for promotion.

Recap for those who are newer (Stolen and modified from Wikipedia because I have no shame):
The king moves exactly one square horizontally, vertically, or diagonally. A special move with the king known as castling is allowed only once per player, per game (see below).
A rook moves any number of vacant squares in a horizontal or vertical direction. It also is moved when castling.
A bishop moves any number of vacant squares in any diagonal direction.
The queen moves any number of vacant squares in a horizontal, vertical, or diagonal direction.
A knight moves to the nearest square not on the same rank, file, or diagonal. (This can be thought of as moving two squares horizontally then one square vertically, or moving one square horizontally then two squares vertically—i.e. in an "L" pattern.) The knight is not blocked by other pieces: it jumps to the new location.

Pawns have the most complex rules of movement:
A pawn moves straight forward one square, if that square is vacant. If it has not yet moved, a pawn also has the option of moving two squares straight forward, provided both squares are vacant. Pawns cannot move backwards.
Pawns are the only pieces that capture differently from how they move. A pawn can capture an enemy piece on either of the two squares diagonally in front of the pawn (but cannot move to those squares if they are vacant).
The pawn is also involved in the two special moves en passant and promotion. (See below)

Castling consists of moving the king two squares towards a rook, then placing the rook on the other side of the king, adjacent to it. Castling is only permissible if all of the following conditions hold:

The king and rook involved in castling must not have previously moved;
There must be no pieces between the king and the rook;
The king may not currently be in check, nor may the king pass through or end up in a square that is under attack by an enemy piece (though the rook is permitted to be under attack and to pass over an attacked square);
The king and the rook must be on the same rank

En Passant:
When a pawn advances two squares from its original square and ends the turn adjacent to a pawn of the opponent's on the same rank, it may be captured by that pawn of the opponent's, as if it had moved only one square forward. This capture is only legal on the opponent's next move immediately following the first pawn's advance.

Promotion:
If a player advances a pawn to its eighth rank, the pawn is then promoted (converted) to a queen, rook, bishop, or knight of the same color at the choice of the player (a queen is usually chosen). The choice is not limited to previously captured pieces. Hence it is theoretically possible for a player to have up to seventeen queens or up to eighteen rooks, bishops, or knights if all of their pawns are promoted.