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p.boxed
  | Pieces generally move like an orthodox queen,
  | but capturing rules are quite complex.

p
  | Note: 'Baroque' is the initial name thought by the author,
  | but 'Ultima' is also largely adopted. 
  a(href="https://www.chessvariants.com/people.dir/abbott.html")
    | He prefers 'Baroque'
  | , and I think me too.

h4 Pieces names

p Pieces names refer to the way they capture, which is described later.
ul
  li Pawn : Pawn or Pincer
  li Rook : Coordinator
  li Knight : Long Leaper
  li Bishop : Chameleon
  li Queen : Withdrawer
  li King : King (same behavior as in standard chess)
p.
  Besides, a new piece is introduced: the immobilizer, written by the letter
  'm' in FEN diagrams and PGN games. It is represented by an upside-down rook:

figure.diagram-container
  .diagram
    | fen:8/8/4m3/8/8/8/3M4/8:
  figcaption Immobilizers on d2 and e6.

h3 Non-capturing moves

p.
  Pawns move as orthodox rooks, and the king moves as usual,
  one square in any direction.
  All other pieces move like an orthodox queen.

p.
  When a piece is adjacent to an enemy immobilizer, it cannot move unless
  the enemy immobilizer is adjacent to a friendly immobilizer or chameleon
  (cancelling the powers of the opponent's immobilizer).
p
  | Note : this corresponds to the "pure rules" described on 
  a(href="http://www.inference.org.uk/mackay/ultima/ultima.html") this page
  | , which slightly differ from the initial rules.
  | The aim is to get rid of the weird suicide rule by weakening the
  | immobilizers lock. In particular, in the original rules two adjacent
  | immobilizer are stuck forever until one is captured. Note that it's still
  | the case if all chameleons disappeared.

h3 Capturing moves

p.
  Easy case first: the king captures as usual, by moving onto an adjacent
  square occupied by an enemy piece. But this is the only piece following
  orthodox rules, and also the only one which captures by moving onto an
  occupied square. All other pieces capture passively: they land on a free
  square and captured units are determined by some characteristics of the
  movement.

p Note 1: the immobilizer does not capture.

p.
  Note 2: for passive captures, a 'X' is added at the end of the move notation,
  to indicate that something was taken (replaying the game is necessary to know
  where).

h4 Pawns/Pincers

p.
  If at the end of its movement a pawn is horizontally or vertically adjacent
  to an enemy piece, which itself is next to a friendly piece (in the same
  direction), the "pinced" unit is removed from the board.

figure.diagram-container
  .diagram
    | fen:7k/5ppp/2N5/2n5/3rB3/8/PPP5/K7:
  figcaption 1.Pc2c4 captures both coordinator and long leaper.

h4 Coordinators (rooks)

p.
  Imagine that rook and king of the same color are two corners of a rectangle
  (this works if these two pieces are unaligned).
  If at the end of a rook move an enemy piece stands in any of the two
  remaining corners, it is captured.

figure.diagram-container
  .diagram
    | fen:8/2b4K/2q5/3p1N1p/8/8/2R5/k7:
  figcaption 1.Rc5 captures on c7 and h5.

h4 Long leapers (knights)

p.
  A knight captures exactly as a queen in international draughts game: by
  jumping over its enemies, as many times as it can/want but always in the same
  direction. In this respect it is less powerful than a draughts' queen:
  on the following diagram c8 or f6 cannot be captured.
  However, the knight does not have to maximize the number of captured units
  (as is the case in draughts).

figure.diagram-container
  .diagram
    | fen:2n4k/3r4/5b2/3p4/1m6/3b4/3N4/K7 d4,d6,d8,a5:
  figcaption All marked squares captures are playable from d2.

h4 Withdrawer (queen)

p.
  The queen captures by moving away from an adjacent enemy piece, in the
  opposite direction (without jumping, the path must be free).

figure.diagram-container
  .diagram
    | fen:7k/8/8/3Qr3/8/8/8/K7 a5,b5,c5:
  figcaption 1.Qa5, 1.Qb5 or 1.Qc5 captures the black rook.

h4 Chameleon (bishop)

p The chameleon captures pieces in the way they would capture. So, it
ul
  li pinces pawns (if moving like a pawn),
  li withdraws from withdrawers,
  li leaps over long leapers,
  li coordinates coordinators.
p ...and these captures can be combined.

p.
  Remark: the move indicated on the diagram doesn't capture the black pincer
  on e5, since it is a diagonal move (not like a pawn).

figure.diagram-container
  .diagram
    | fen:7k/8/8/r3pP2/2n5/8/B7/K7 a5,c4:
  figcaption 1.Bd5 captures the two marked pieces.

p.
  Besides, chameleon immobilizes immobilizers (but cannot capture them since
  they do not capture).

p.
  A chameleon captures the king in the same way the king captures, which means
  that a chameleon adjacent to a king gives check.

h3 End of the game

p.
  The game ends by checkmate or stalemate as in standard chess. Note however
  that checks are more difficult to see, because of the exotic capturing rules.
  For example, on the following diagram the white king cannot move to e5
  because then the black pawn could capture by moving next to it.

figure.diagram-container
  .diagram
    | fen:7k/8/8/p4r/4K3/8/8/8 e5:
  figcaption 1.Ke5 is impossible

h3 More information

p
  | A good starting point is the 
  a(href="https://en.wikipedia.org/wiki/Baroque_chess") Wikipedia page
  | , which also gives pointers to other interesting pages (including
  | chessvariants.com, as usual).

p Inventor: Robert Abbott (1963)