(This is a port of the real life board game Mur to Tékumel)
Svá, meaning "heirs" is a two-player game of court intrigue from Bednalljan times. It is played on a circular board with eight spokes and three rungs. There is a central spot, but the spokes leading to it are deleted and often the spot is occupied by art. The outer rung is often stylized differently, sometimes as a river, sometimes as a wall. There are 15 identical light pieces (the "sons") and 15 identical dark pieces (the "daughters"), and one slightly larger piece in a bright color, called the Old Man.
Setup
The board is cleared. One player takes the sons, the other takes the daughters. The Old Man is placed on the center spot. The sons player goes first.
Victory
Victory is achieved by trapping the Old Man, or trapping three total enemy pieces.
Play
Players go back and forth taking turns. On a player's turn they may take one of the following actions:
1. Place a piece on an empty intersection
Simple as.
2. Move a piece.
Pieces belonging to one player that are connected adjacently have a rank that is equal to the size of a group. Thus a piece by itself is a "rank 1" while each of four connected pieces is "rank 4". The Old Man is considered to be rank 4.
The player picks one piece, and moves it an exact number of spaces equal to its rank, in a straight line, "bouncing" off the outer wall back inwards if necessary, to an empty space, or a space occupied by a piece of an equal or lower rank.
If the space is occupied, the piece already there is "bumped" to the nearest unoccupied spot along the same line of travel (again, possibly bouncing off the outer wall).
It is not allowed to move a piece into a spot where it would be trapped (see below), unless that would trap the Old Man or an opponent's piece.
3. Surrender a trapped piece.
A piece is trapped if all its adjacent pieces are occupied by the other player's pieces. Thus the Old Man cannot be part of a trap.
If, at the start of your turn, any rank 1 piece is trapped -- all adjacent spaces taken up by pieces of the opposing player -- then you must remove it, as your turn. Removed pieces can be re-placed on the board.
Only rank 1, unconnected pieces, can be trapped.
Edge Cases
If a player does not have a move, or does a move that does not change the board state, they must remove one of their pieces as their turn, instead.
If a player is faced with a board that is identical (a repeat) from up to four turns ago, they must remove their piece as their turn, instead.
Match Play
It is common to play a continuous set of games. After a game is won, the board is only partially reset: all extraneous trapped pieces are removed (without counting as further scores), and the Old Man is moved back to the center. First move alternates between the two players.