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Brandub is a game of the hnefatafl family, played by the Irish.  It 
is the smallest known hnefatafl game.  A king and four defenders face 
eight attackers on a board of seven rows of seven points.  The king must
 escape to one of the corner squares, while the attackers must capture 
the king.  All pieces move in straight lines like the rook in chess, and
 capture an enemy by surrounding it on two opposite sides.
History of Brandub
 
    
A diagram of the tenth-century brandub board found at Ballinderry in Ireland.
 
Ireland is one among many countries to which the Norse raiders and 
settlers took their arms, their culture and their game of hnefatafl.  
There has been confusion about what the Irish called this game, but 
literary evidence settles on the name brandub, or brannumh, which means,
 inexplicably, “black raven”.
While the size of hnefatafl boards 
varied from place to place, archaeological finds show that the Irish had
 a preference for the smallest of the boards, 7 squares by 7.  Boards 
found at Downpatrick, Waterford, Antrim, and a famous board from 
Ballinderry, are all of this size.  Poetry also suggests that they 
played with 13 pieces: a branan, or chief, with 4 guards against 8 
attackers.
The game may have been played in Ireland by the 9th 
century.  It was certainly played by the 10th, when the Ballinderry 
board was made.  Some of the poetry dates from the admittedly vague 
period of 1200-1640, showing the game was enjoyed in Ireland for at 
least 300 years, possibly as much as 800.  In all probability, the 
coming of chess to Ireland would have eventually put an end to brandub’s
 popularity.
Rules for Brandub
 
    
Initial layout of a game of brandub.
Nowadays, the game is often played on 
the squares of a board of 7 rows of 7 squares.  The layout here is shown
 with the game played on the lines instead.  Either design of board is 
equally valid.
 
Most of the popular books have been unusually reluctant to propose a 
set of rules for playing brandub.  The rules proposed here are based on 
the poetic and archaeological information from an article by Éoin 
MacWhite in the journal Éigse, from 1946.
1. Brandub is played by 
two players, on the points or intersections of a board of 7 lines by 7, 
using 13 pieces: a king, four defenders and eight attackers.  The 
central and corner points of the board are marked, as shown in the 
diagram.
2. The pieces are placed with the king in the centre, the
 defenders adjacent to him, and the attackers beyond, all forming an 
orthogonal cross reaching to the edges of the board, again as in the 
diagram.
3. The attackers make the first move, followed by the king or defenders, play alternating thereafter until the game is finished.
4.
 A player may move a piece by sliding it along a line in any direction 
to another point, as far as the player pleases, providing that it does 
not turn a corner or jump over another piece.
5. Only the king may come to rest on the central point or one of the four corners, though other pieces may pass the centre.
6.
 An enemy is captured by surrounding it on two opposite sides, along a 
marked line, by two of one's own pieces.  The enemy is then removed from
 the board.
7. The king may act with a defender in making 
captures, and may himself be captured by two attackers, or two defenders
 may take an attacker.
8. If a piece simultaneously traps two or three enemies in different directions, all of the trapped enemies are captured.
9. A piece may move between two enemies without harm.  One of the enemies must move away and back again to capture it.
10.
 Either side may capture an enemy by trapping the enemy between one of 
its own pieces and a marked corner square.  The central square does not 
have this effect.
11. The king and defenders win the game if the king reaches one of the marked corner squares.
12. The attackers win the game by capturing the king.
13.
 If play becomes repetitious, if one player has no legal move, or if the
 players otherwise desire it, then a draw may be declared.
Strategy in Brandub
In larger versions of hnefatafl, the attackers try to construct a 
fully-enclosed blockade around the defenders.  But in brandub this is 
all but impossible.  So instead the attackers must try to restrict the 
defenders' movement in other ways.  Partial blockades can be 
constructed, often such that defenders can break out but not without 
loss.
Defenders need to try to get outside the attackers' 
formation in order to attack it from the rear, as in other versions of 
hnefatafl.  In brandub, however, the small number of pieces means that 
losses cannot be so easily be borne by the defenders.
It is easy 
to assume that brandub will be the easiest hnefatafl game, from the 
smallness of the board and the paucity of pieces.  This couldn't be 
further from the truth.  Fewer pieces means that each must take on a 
greater responsibility, often doing double duty both in attacking the 
enemy and defending comrades.  Short-term tactics like the pin and the 
fork are more devastating in this game than in larger variants.