I mean, looks pretty checkmate to me.

[![enter image description here](https://i.stack.imgur.com/XbSRx.png)](https://i.stack.imgur.com/XbSRx.png)

Everywhere I look this up, they never speak about the fact that it is at least theoretically possible to win with just a bishop and a king. Why is that? I mean shouldn't they at least mention it?

Same goes for knight and pawn:

[![enter image description here](https://i.stack.imgur.com/1b8w5.png)](https://i.stack.imgur.com/1b8w5.png)

[![enter image description here](https://i.stack.imgur.com/2ZfEo.png)](https://i.stack.imgur.com/2ZfEo.png)