Efficient way of improving!

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Bullet6422

Recently I have played a few games in which I have dominated my opponent, to a point where they have nought to do but sit around in their fortress. But what I struggle with is finishing them off. So, in result, completing endgame drills and tactics trainer should in theory be most beneficial to your overall improvement as these skills are used in actually wining the game. Anybody disagree?

Bullet6422

 

Zombiesen

In your puzzle, 22.. ...a2 also wins.. and theoretically, its more sound.