p.boxed
  | Checkmating the queen wins too. A queen cannot go or stay under check.

p Just as the king, the queen can be checked and mated. This means that
ul
  li It is not allowed to make a move such that the queen can be captured.
  li.
    When your queen is attacked, you must play a move such that the queen
    is no longer attacked.
  li If it's impossible, then you lose.

p.
  Since the king remains royal, this allows a new way to win: check both
  royal pieces at the same time, like on the following diagram.

figure.diagram-container
  .diagram
    | fen:4Q3/4K3/8/8/3N4/5k2/2q5/8:
  figcaption Both black king and queen are in check: white wins.

h3 Special moves

p.
  If a pawn promotes into a queen, the latter is royal as well.
  So under-promotions might be wiser.

p.
  You can castle with the queen or the king and any of the two rooks,
  under the same conditions as orthodox castling.
  Here is the resulting position after two white small castles and
  one black large castle with the queen:

figure.diagram-container
  .diagram
    | fen:r4rq1/ppppppkp/6p1/8/8/8/PPPPPPPP/1QR2RK1:
  figcaption After two white small castles and one black large castle.

p.
  Note: to castle in a game you need to select
  the king or queen first, and then move it to a rook.

h3 Source

p
  a(href="https://www.chessvariants.com/winning.dir/coregal.html") Coregal Chess
  |  on chessvariants.com.
  | This variant can be played too 
  a(href="https://greenchess.net/rules.php?v=coregal") on greenchess.net
  | .

p Inventor: Vernon R. Parton (1970)