p.boxed
  | Captures swap pieces. Goal is to bring enemy king to your first row.

p.
  When a piece is taken it is not removed from the board, but moved instead
  to the square that was initially occupied by the capturing piece.

p.
  It is forbidden to "un-do" a capture right after it was played:
  in the diagram position, 3...Bxg7 is not allowed.

figure.diagram-container
  .diagram
    | fen:rnbqk1nr/ppppppBp/6p1/8/8/1P6/PbPPPPPP/RN1QKBNR:
  figcaption After 1.b3 g6 2.Bb2 Bg7 3.Bxg7

ul
  li.
    The king cannot move at all, except by being captured by one of the
    opponent's pieces. There is no castling.
  li Taking a king has no effect besides moving it.

p.
  Pawns don't promote, but instead just stay on the back rank where they
  can't move. A pawn can still re-enter play after this happens,
  by being captured.

h3 End of the game

p The goal is to "suck" the opponent's king to your own first rank.

figure.diagram-container
  .diagram
    | fen:2Pb3r/1rP3nq/1p2p2p/p1p2NpP/1P2R2k/P3p2P/pN1PP1B1/R1BnQ1Kb:
  figcaption White can win with 1.Qxh4

h3 Source

p
  a(href="https://www.chessvariants.com/rules/suction-chess") Suction chess
  |  on chessvariants.com.

p Inventor: Nathaniel Virgo (2018)