Twin King Chess - @eryxc VS @PixelByPixel

Twin King Chess is a variant in which the Queen is replaced by another King! In this variant, you must keep both Kings safe: if one is put in check, you cannot sacrifice it! Castling is like normal, and both Kings can castle, but they can't both castle longways (that would require moving one of them out of the way). If both Kings are put in check, then you must capture the offending piece -- otherwise, you would lose a King! Also, if an opponent's piece pins one of your Kings against the other, you must block or capture the offending piece. Finally, you may not promote your pawn to a Queen.

@eryxc plays white. Good luck!

Another name is dual chess. 

In "weak dual chess" you can sacifice one of the king and the remaning become royal. 

Oh... Well, there are no sacrifices here!

Also:

https://www.chess.com/forum/view/chess960-chess-variants/dual-chess

This is not the same as your variant.

E4

Nc3.

Bc4

e6.

Nf3

f5.

xf5

The remarkable thing about this game is that it doesn't seem to matter whether you start with a single King or with two. When I played this with one side giving 'King odds', the match was a complete wash. Apparently the advantage of a second King in a Pawn ending is cancelled exactly by the extra liability in the middle-game.

xf5.

D4

Nf6.

0-0

Bd6.

Re1

Ne4.

Ng5