RangeSharp
RangeSharp
The science behind why cramming solver output fails, and how spaced repetition builds permanent recall.
You spent three hours last weekend studying PioSolver output. You had BTN vs BB defense ranges down cold. You even wrote notes. Then you sat down Tuesday night, got dealt K8s on the button, and froze. Fold? Raise? You had this. Didn't you?
You did. For about 48 hours. Then your brain threw most of it away.
This happens to everyone. It's not a poker problem. It's a memory problem. And we've known how to solve it since 1885.
Hermann Ebbinghaus was a German psychologist who spent years memorizing nonsense syllables and tracking when he forgot them. His work produced something called the forgetting curve. The short version: without review, you lose roughly 70% of new information within 24 hours. By day 2, you've forgotten more. By day 7, most of it's gone.
The curve isn't fixed. Review changes it. Every time you successfully recall something, the curve flattens. The next forgetting interval gets longer. Fail to recall, and the curve stays steep. Your brain is basically doing triage. It keeps what you use. It dumps what you don't. The problem with one-off study: you're never "using" the information in a way that signals importance. You looked at it once. Your brain files it under "maybe" and then purges it when space gets tight.
This applies to solver ranges the same way it applies to vocabulary words or anatomy terms. When you study for three hours on Sunday, you're loading your short-term memory. It feels solid. You're making decisions, checking answers, feeling smart. But short-term memory is temporary. Your brain doesn't treat "K8s is a raise from the button" as important until you prove it by recalling it successfully at intervals. If you don't, it gets dumped. There's no room for everything.
Cramming is the worst way to learn. You pack a ton in, feel like you've got it, and then watch it evaporate. The retention curve looks like a cliff. I used to do Sunday marathon sessions. By Wednesday I was back to guessing on the same spots. It was frustrating and pointless. I blamed the spots for being hard. The spots weren't the problem. My study method was.
Here's the part that changed how I study. The most efficient time to review something is right before you're about to forget it. Too soon, and you're wasting time. You already know it. Too late, and you've forgotten. You're relearning from scratch. The sweet spot is that moment when recall is possible but not effortless.
Spaced repetition systems find that sweet spot. They show you something. You answer. If you get it right, they wait longer before showing it again. If you get it wrong, they bring it back soon. Over time, each piece of information gets reviewed at the optimal interval. Things you know well drift to longer intervals (days, then weeks). Things you mess up keep coming back until they stick.
The research backs this up. Studies on spaced repetition versus massed practice show roughly 2-3x better long-term retention for spaced learning. It's not a small improvement. It's the difference between actually knowing something a month later and having to look it up again.
Medical students run Anki decks for thousands of flashcards. Anatomy, pharmacology, pathology. The entire curriculum gets broken into recallable chunks. They're not smarter than you. They're using a method that works with how memory actually works.
Language learners use spaced repetition for vocabulary. Duolingo, Memrise, and dozens of other apps lean on the same principle. New words appear. You see them again when you're about to forget. Over months, you build a working vocabulary instead of a pile of words you looked up once.
Poker ranges are the same structure. Each spot is like a flashcard. "What do you do with 76s from the cutoff when UTG opens?" That's one card. "What's your 3-bet range from the BB vs a BTN steal?" Another. The algorithm doesn't care about the domain. It cares about whether you recalled correctly and when to show you again.
Every preflop spot you study is a discrete piece of information. BTN open. CO vs BTN 3-bet. BB vs SB squeeze. You can study them in a block and forget most of it. Or you can train them with spaced repetition and build something permanent.
When you get a hand wrong in a spaced repetition system, it comes back sooner. Maybe tomorrow. Maybe in two days. When you get it right repeatedly, the interval grows. One day, then three, then seven, then fourteen. Eventually, the spots you've mastered only show up every few weeks. They're still in your head. You're just not wasting time reviewing what you already know.
The goal is automatic recall. At the table, you don't have time to think "was 98s a call or a fold from the BB vs a CO open?" You need to know. Spaced repetition gets you there by forcing recall at the right times until the answer is automatic.
FreeRangeLab uses FSRS (Free Spaced Repetition Scheduler), the same algorithm family as Anki. It's well-tested. The implementation treats each hand in each spot as a reviewable item. You train in Decision mode (deal hand, choose action) or Recall mode (paint the whole range from memory). Wrong answers get scheduled sooner. Right answers get spaced out. Your dashboard tracks mastery per spot so you can see where you're weak.
I used to think the problem was effort. If I just studied harder, the ranges would stick. So I'd block out a full afternoon, open PioSolver, run every position, and take pages of notes. By the end I had a headache and a false sense of competence. I could recite ranges back to myself. That's not the same as recalling them under pressure.
The real problem was timing. I was loading everything into short-term memory at once. No rehearsal. No spaced retrieval. No chance for my brain to consolidate. When I showed up at the table two days later, the information had already faded. The worst part: I couldn't tell. I thought I knew it. Overconfidence on top of forgetting.
Don't try to learn every position in one session. Pick one spot. BTN open, for example. Study the range first. Understand why hands are in or out. Then start training. Let the algorithm handle the scheduling.
Consistency beats volume. Twenty minutes daily beats a three-hour Sunday session. Your brain needs those repeated touchpoints. One long cram and then nothing for a week is the worst possible schedule. I switched to daily training about six months ago. The difference in retention is obvious. Spots I used to re-learn every month now show up once every few weeks for a quick check. They're in there.
Focus on the edges. Obvious folds (72o) and obvious raises (AA) don't need drilling. The borderline hands (K9s, QJo, 65s in various spots) are where you leak. Those are the ones that should show up most in your review queue. The algorithm learns which hands you mess up. Let it. Don't fight it by only reviewing the easy stuff.
Review your mistakes. When you get something wrong, look at why. Was it a genuine memory lapse or did you never really understand the hand's inclusion? If it's the latter, fix the understanding first. The algorithm can't help you memorize something you don't get. I used to blame the trainer when I kept getting 54s wrong from the BB. Turns out I never understood why it was a call. Once I did, the card stopped coming back.
Here's what clicked for me. I was treating range study like a one-time download. Learn it, then move on. That's not how memory works. You have to prove you know it, again and again, at increasing intervals. The forgetting curve is real. Spaced repetition is the antidote.
Your preflop spots are flashcards. Treat them that way, and they'll stick. Treat them like a Sunday afternoon binge, and they won't.
The algorithm needs data to work. Your first few sessions might feel random. You're building a history. After a week or two, the scheduling starts to make sense. Wrong answers appear when you need them. Right answers drift to longer intervals. Trust the process. It's the same one that gets med students through anatomy and language learners through conjugations. If you've been studying for months and your ranges still feel wobbly, the method is probably the issue. Try spaced repetition for four weeks. Same spots. Twenty minutes a day. See if the recall improves.
Master your preflop ranges.