A few hints on endgames for U2000 players

I am bad at some endgames, but I really like rook endgames and some rook endgames I am good at (Though not all rook endgames, I am also bad at some rook endgames, including "theoretical" ones).
Rook endings have brought me many points since years, from equal or lost positions.

Knowing your weaknesses is good because then you can either work on them (Or ignore them, to quote famous guitarist Steve Vai at some master class "I ignore my weaknesses") or you can try to avoid them in your chess games.

Which endgames you should be careful with :

1. Pawn endgames. Pawn endgames usually require precise calculation, and one mistake can mean a direct loss, or throwing a win into a draw.
2. Knight endgames. Botvinnik said something that "knight endgames are essentially pawn endgames", and because a lot of knight moves can be more difficult to calculate than for example bishop or rook moves in endgames, make sure to not just go into a knight endgame, unless you have enough time to calculate and you feel confident that you will either draw or win.

A few hints about rook endgames :

1. Activity, either rook or king activity, is super important.
2. Passive defense is usually bad in rook endgames, but there are exceptions.
3. When material up, it is recommended to swap a pair of rook
4. Rooks like to gobble up pawns and are also very good pieces to attack pawns. If there is no target then try to force the opponent to weaken their pawn structure so that you will have a target.
5. When you are behind in material it makes usually sense to keep all rooks on the board, because if you have still two rooks it will be easier to put pressure on a target (pawn) or create a checkmate net.

Here a game I played today. I had more active rooks though my king was cut off. The position was equal but I tried to create a weakness, and then my opponent blundered, and I won an important pawn. After that I swapped a pair of rooks and converted the advantage.

Here a famous rook ending game.
Botvinnik versus Fischer. 19 year old Fischer was not yet at his peak, and incorrectly went for the rook ending. Then the game was adjourned and Fischer apparently thought it was an easy win. Then Botvinnik, after the adjournment, did not give up, and apparently analysed with his team till 5:30 in the morning. Then Efim Geller found the drawing idea, going for a rook ending with a and h pawn, which is drawn.