Summary on the Historical Hnefatafl.
We recognised the Saami Tablut rules by February 2013:
Summary on the Saami Tablut.
The Saami Tablut setup and rules are given directly by the Carl von Linné diary 1732.
The Welsh Tawlbwrdd is described in the Robert ap Ifan manuscript 1587.
We found a best bid on the rules based on the Saami Tablut (May 2016):
Summary on the Welsh Tawlbwrdd.
After shortly testing various possibilities, the Saami rules were found to work best also for Brandubh (March 2015):
Summary on the Irish Brandubh.
All three variants appear to be the same sole game, the historical Iron Age Hnefatafl, only played on various board sizes.
Measured game balances:
Tablut: 110 attackers' wins per 100 defenders' wins.
Tawlbwrdd: 117 attackers' wins per 100 defenders' wins.
Brandubh: 140 defenders' wins per 100 attackers' wins.