On the post Dissection of a microdrill Bright Knight commented:
I believe that conscious feedback is important. If you get the solution to a problem wrong, it helps to work out why you got it wrong, and what you could have done to get it right. (Being too slow can be “getting it wrong” in this context.) Finding simple chess tactics is mostly an automatic unconscious process (unless you are a beginner). If you get it right very quickly, so quickly that you did not have time to work it out, that proves that you are doing it on autopilot. If you do not solve a simple problem quickly, you have not demonstrated even temporary success at the skill. You need to find the solution quickly, and have as much time as you need to reflect if you do not. If you fail to get the solution, a fast time limit is bad, because finding the solution for yourself is much more instructive than being told the answer - but spending too long on a problem is bad time management. The number of repetitions is critical. If you do not constantly repeat a complex skill it will disappear. If you want to retain the skill to spot a tactical pattern, you have to practice that skill for the rest of your chess playing life (ideally every time you are just about to lose it). (Being too slow constitutes “losing the skill” here.) If you do not repeat a skill, you do not know whether you still have it. The spacing between repetitions is critical. If you space them too widely you will remember very little, and if you space them too closely you will forget most of what you have learned very quickly.
I can't stress enough that we are talking about two quite different processes here:
- Acquisition of knowledge.
- Acquisition of skill.
Knowledge tend to fade away overtime. So it has to be repeated every now and then. Once acquired, skill doesn't dissappear overtime. Exactly as you never forget how to ride a bike or how to swim.
I told you that there are two critical factors for scandrills:
- Conscious feedback.