p.boxed
  | If a piece is checkmated (as if it was a king), it is captured.

p.
  If a piece is attacked and no orthodox move can prevent its (normal) capture,
  it is considered to be mated and is removed from the board.
  If such an orthodox move exists, it doesn't have to be played
  (it could even be illegal because normal captures are forbidden):
  the piece is not captured.
  Thus, kings and other pieces may remain under check.

p.
  If after a mate-capture another is made possible thanks to some pieces
  removal, then the new mate-capture is applied and the process goes on.

figure.diagram-container
  .diagram.diag12
    | fen:1rb1n1r1/1ppp1pkp/pn4p1/4p3/3qN2Q/4bP2/PPP1P1PP/R2BKR1N:
  .diagram.diag22
    | fen:1rb1n1r1/1ppp1pkp/pn6/4p1Q1/3qN3/5P2/PPP1P1PP/R2BKR1N:
  figcaption.
    Before and after 1.Qg5X, which takes first the bishop on e3,
    and then the pawn on g6.

p.
  Pieces cannot be taken in the normal way, only by the "mate-capture"
  described above.

p The game ends when a king is "mate-captured".

figure.diagram-container
  .diagram
    | fen:rnbqkbnr/p1pppppp/8/8/1P6/2N5/P1PPPPPP/RNBQKBNR:
  figcaption After 1.b4 b5 2.Nc3X the b5 pawn is "mate-captured"

p.
  Note about moves notation: since captures do not occur on final squares,
  an "X" mark is appended to the move to indicate a capture.
  To keep notation short the potential list of captured squares is not written.

h3 "Suicide" note

p.
  In the current implementation, all pieces except kings can "commit suicide",
  that is to say move or be left on a square where they are mated.

h3 Source

p
  a(href="https://www.chessvariants.com/difftaking.dir/allmate.html")
    | Allmate chess
  |  on chessvariants.com.

p Inventor: Dr. Chris Taylor (1979)