When you do Troyis on a daily bases for, say, two hours per day, then you will encounter a plateau in about two weeks. It is next to impossible to break that barrier. I have played it for about a month, in the past.
Troyis learns you to move a knight around in a confined space. And although I plateaued after about two weeks, my knight handling had improved so much, that I scored like a 2600 grandmaster in this test.
It might well be possible to get better at Troyis, but there is no reason for it. If I take my time and analyse the game, I can come up with a few strategies to move more efficient. But that is in a sense a rather artificial way to make progress. You don't break the boundaries, but you shift them. Which in it self is perfectly fine, of course.
From that point of view, it doesn't make sense to push your limits when you reach a plateau. 98% of your energy will be spilled. An educated guess would be that you reach a plateau after 20-30 hours of training in any chess tactics task. In other words, it doesn't make much sense to improve until you plateau, and from there try to become, say, twice as fast as you are, by rabid exercising. Before you know it, you feel banned to the salt mines.
It makes much more sense, to identify the underlying subtasks, and train them in isolation. Until you reach a plateau for that very subtask.
Identifying the subtasks is no sinecure. If you compare for instance FAES easy (Find All Escape Squares) with FAES-hard, it feels like two complete different exercises, albeit the idea behind them is the same. That can only be when FAES-h has a few extra underlying subtasks, which FAES-e has not.
So for me, plateauing is where the exercise ends, not where it begins. And when the exercise ends, the search for underlying subtasks begins.
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