Last Sunday
You studied it for two hours. Where did it go?
Rereading feels like learning. Recalling is learning.
Forgetting has a shape.
In 1885 Hermann Ebbinghaus measured how quickly he forgot lists he had learned. The result — the forgetting curve — is steep at first and then flattens: most of what you lose, you lose in the first days.
The good news is in the second half of his finding. Every time you successfully recall something, the curve that follows is flatter than the one before. Time it well and a handful of reviews is enough to keep a line for months.
Remember fewer, bigger things.
In a classic 1973 study, Chase and Simon showed that chess masters recall real positions far better than beginners — but no better when the pieces are placed at random. Masters don't have better memories. They see a few meaningful chunks where a beginner sees twenty separate pieces.
You can do the same with an opening. Instead of twelve moves, remember three ideas: a pawn structure, a pin, and a plan. Turn them on below.
The effort of remembering is the exercise.
Testing yourself beats rereading — one of the most reliable findings in learning research.Test yourself. Don't reread.
Retrieval practice — trying to remember before you look — is one of the most reliable findings in learning research. The effort of recalling is what strengthens the memory. Try it: say the move before you flip each card, then grade yourself honestly.
Notice the button labels: Again brings a card back in ten minutes; Good sends it away for a day, then six, then longer. That schedule is the third technique.
Learn it, then miss it.
The first run is new; a slip brings the line straight back ten minutes later, while it is still fresh.
Fix it while it's warm.
A lapse resets the line's schedule. You replay it now, and it starts climbing again tomorrow.
One minute, the next morning.
The first clean recall. The next gap is six days.
Six days later.
Recall is harder now — which is exactly what makes this review count.
Then weeks. Then months.
Each clean recall multiplies the gap. Lines you know drift out of your queue on their own. An illustration of the schedule: due lines appear in your course's review queue.
Review just before you'd forget.
Spaced repetition schedules each line individually. Every clean recall pushes the next review further away; every slip pulls it back. Over time, the lines you know well almost disappear from your queue and your practice time goes where it is needed.
This is the SM-2 schedule the course trainer on this site uses for every line. Play your side of a line below; a clean run is a "Good".
Fifteen minutes a day beats two hours on Sunday.
Spacing works across days, not within one session. A short daily routine keeps every line on schedule:
Reviews first
Play every line that is due today. Don't skip the easy ones — that is how you find out they aren't.
One new line
Understand it, then play it from memory twice. One a day adds up to a full repertoire in a few months.
Then use it
One quick game, or a few minutes against a bot from that position. Recall under a clock is the real test.
Mix where you start. Drilling a line only from move one teaches you the first moves very well and the last ones badly. Start some reviews from the middle of the line.
Questions, answered.
Why do I keep forgetting my chess openings?
Because memories fade unless they are retrieved, and rereading or rewatching isn't retrieval. Lines you play from memory, on a widening schedule, stay; lines you only look at fade within days.
What is spaced repetition in chess?
Reviewing each line just before you would forget it, at growing intervals — for example after one day, six days, then two weeks. Each successful recall makes the memory last longer, so reviews get rarer over time.
How long does it take to memorize an opening?
The first five or six moves of a main line can be solid within a week of short daily drills. Holding a full repertoire takes ongoing, light review — a few minutes a day once the schedule is running.
Should I use flashcards for chess openings?
Yes, if each card shows a position and asks for the move, and you answer before revealing it. Better still is playing the move on a board, which is what a drill trainer does.
Is it better to memorize or understand openings?
Understand first, then memorize. Moves you understand are far easier to recall, and understanding is what carries you once the opponent leaves your preparation.
