Fendo, as played here, does not follow the official rules. When a recent game of Fendo ended, there still was a large open area. Also, one of the players had not placed all of his figures on the board.

The rules should be exactly according to the official rules. There is no rule that all the stones have to be laid on the board.

If you are talking about this game:

https://www.littlegolem.net/jsp/game/game.jsp?gid=2374797

It's a good question why the game ended immediately after White's (Blue's) turn with a loss for White. Is it because the game can look ahead one turn and know White had no possible move left?

It is according to rules: https://spielstein.com/games/fendo/rules

The entire territory is divided among the players. The last territory that contained multiple stones belonged to only one color.

That's interesting. And it makes sense!

But I do not see that end condition in the rules.

==

“The game ends as soon as the open area is cleared away by placement of a fence, i.e., only closed regions with single pieces inside exist. Players may still have pieces in their stocks.”

In the game I linked, “… only closed regions with single pieces inside exist” does not exist, haha.

I've got a question about Fendo that doesn't seem to be covered by the rules:

What if a player has no legal moves?

I'm guessing that they have to pass. Just to give a concrete example, consider a 7-1 corridor with white to move:

R R . W . R R

I'm guessing that the way this plays out is that white passes, then the red must play to separate their stones (on one side or the other) like so:

R:R . W . R R

I was wondering what would happen if neither side could play, but now I've convinced myself that that isn't possible.