To that comes that the board can contain a throne square or not. The game with a throne will be called Brandubh, and the game with no throne will be called "Brandubh throneless".
This makes in all 6 possible initial setups for the Brandubh 7x7 game. In any case the Brandubh king is armed, is captured from two sides and wins in corner.
|Board setup||Brandubh throneless||Brandubh (throne)|
||-2.75 (30 games)||+1.40|
||-4.00 (30 games)||+1.47|
The measured game balances confirm, that a throne square protects the king and is a help to the defenders.
The best balanced setup was found to be Brandubh cross.
As for historical evidence, the Ballinderry board has marked corner squares and a marked throne. Our test games show that the Brandubh cross setup fits this board.
More about the Irish Brandubh in our forum.