Wikipedia article say BB vs N endgame is a semi-fortress.
The way i associates a semi-fortress is as follows -> may require pinpoint accuracy to win.
Do you classify following positions as semi-fortress.
[d]2K5/8/2p1k3/3b4/Q1p1n3/4P3/1P6/8 w - - 0 20
[d]1QK5/8/2p1kn2/3b4/2p5/4P3/8/8 w - - 0 18
https://en.wikipedia.org/wiki/Fortress_ ... i-fortress
What does semi-fortress mean?
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Re: What does semi-fortress mean?
I guess the semi-fortress is not a true fortress but a fortress-like position which can be eventually broken (a "pseudo-fortress").
Sometimes, when the fortress collapses, the weaker side tries to rebuild another one elsewhere.
In the BB/N ending if a fortress with Nb2 is broken, the weaker side can be stopped to rebuild it elsewhere (with Ng2, Nb7, or Ng7).
In NN/Q the fortresses have some dynamism and they are constantly destroyed and rebuilt resulting in a draw.
Even a simple endgame like Q/R features semi-fortresses. There are the fourth-rank, third-rank, second-rank defences and finally the Philidor position which one by one must be broken.
Sometimes, when the fortress collapses, the weaker side tries to rebuild another one elsewhere.
In the BB/N ending if a fortress with Nb2 is broken, the weaker side can be stopped to rebuild it elsewhere (with Ng2, Nb7, or Ng7).
In NN/Q the fortresses have some dynamism and they are constantly destroyed and rebuilt resulting in a draw.
Even a simple endgame like Q/R features semi-fortresses. There are the fourth-rank, third-rank, second-rank defences and finally the Philidor position which one by one must be broken.