Daily challenge ·
What happened next?
Five real charts with no name and no prices. You see 40 weeks, I cover the next 8, and you call what happened. Two minutes. At the end you find out what someone answering at random scores.
Free rounds do not use up today’s challenge and do not count towards your streak. Same rules, different charts.
What do you want to play with?
Why there is no difficulty filter
There is no easy/hard filter, and there will not be one. Each round’s threshold is that asset’s own median 8-week move, so exactly half of its history lands on each side: a quiet currency and a wild coin are equally hard to call. This filter is about what you feel like looking at, not about difficulty.
Bringing in today’s charts…
Today’s charts did not come through. It is my data provider, not you.
Round 1 of 5
The shaded part is hidden. What did this chart do in those 8 weeks?
Your result
Answering at random scores 3.75 out of 10 on average. That is the number that matters here.
Almost everyone lands near the dice, and that is the point: eight weeks out, a price is close to a coin flip. That is why the lessons here are not about calling the next move — they are about time, costs and not selling on the worst day.
One honest detail: across these five years of data the charts rose more often than they fell, so always answering “it rose” beats the dice by a little. That is a lesson too, and it is the one that holds up long-term investing — not a way to guess the next two months.
What gets copied is the grid, your score, the date and your streak — and the link, so whoever opens it plays the same challenge. Nothing else about you leaves this browser.
A new challenge every day, at midnight Mexico City time.
Yahoo Finance weekly closes loading…
Your streak
Nothing here yet. Play today’s challenge and this fills in on its own.
- Current streak
- 0
- Best streak
- 0
- Days played
- 0
- Rounds nailed
- 0
One square per day. Filled in means you played; the stronger the colour, the more points you got.
This lives in this browser only: no account, and nothing about it is sent anywhere. Switching phone or clearing your browsing data starts it from zero, and that is the honest price of not asking you to sign up.
Delete your streak, your calendar and your totals? This cannot be undone.
How today’s challenge is picked
- The only ingredient is today’s date in Mexico City: “…”. Not the time, not your language, not your device.
- That date seeds a small reproducible random generator (xmur3 + mulberry32, 30 lines, no libraries).
- With it we shuffle the 12 assets and take five, and then draw five cut points along their five years of weekly closes.
- So the same day gives the same challenge to everyone, anywhere, and yesterday’s can be rebuilt from the date alone. No server and no account are involved.
The rules are one file with tests: src/lib/challenge/reto.mjs.
What you learn here
- To read the shape of a chart without the asset’s name telling you what to expect.
- That “a lot” and “a little” depend on the asset: 8 % in two months is routine for bitcoin and an earthquake for the peso. That is why every round sets its own threshold.
- That two months out a price looks a lot like a coin flip — which is exactly why the serious strategies are the boring ones.
Educational challenge built on real historical data. Something having happened does not mean it happens again: this predicts nothing, it is not a recommendation to buy or sell, and it is not financial advice. Nothing is wagered and nothing is won here.