brainGO FAQ: Go, Capture Puzzles, Kids, Seniors — Answered
⏱ Read ~7 min · Updated July 2026 · Part of: Learn Go
Common questions about Go, 4×4 capture puzzles, and brainGO — answered honestly in plain language.
About Go
Is Go really the hardest game in the world?
No — that's Go's reputation, not the reality. Go has remarkably few rules (basically: surround a stone to capture it). What's deep is the strategy that grows from those rules, not the rules themselves. A beginner solves their first 4×4 puzzle in under a minute. See Learn Go.
What age can kids start Go?
Very young. Because Go has no numbers and requires no reading, a pre-literate child (about age 4+) can play 4×4 capture puzzles after one demonstration. The small-board "capture go" tradition is how generations of kids enter Go. See Is Go good for kids?.
Is Go good for seniors?
It can be a great daily brain exercise — visual, no number anxiety, short rounds, calm. We say it gets your brain moving; we don't say it prevents dementia, because evidence is inconclusive. For memory concerns, see a clinician. See Is Go good for seniors?.
Are the rules the same on 4×4 and 19×19?
Exactly the same — liberties, captures, atari, ko. The difference is board size + win condition (capture vs territory). The skill you learn on 4×4 (calculation) transfers to 19×19. See Board sizes.
About brainGO
Is 4×4 Go "real" Go or a toy?
It's a distillation of real Go. Full Go is 19×19 with territory and scoring. But the load-bearing skill — reading liberties and captures a few moves ahead — is pure and complete on 4×4. See Capture go vs full Go.
Do I need to buy a board or anything?
No. brainGO runs in a browser — no app download, no physical board. 4×4 puzzles are generated by an exact engine; every "correct answer" is provably correct.
Does brainGO use Zhang Xu's 4-road Go puzzles?
No. Puzzles are 100% generated by our own solving algorithm — every position is exhaustively searched, the answer is provably correct. We use no one's copyrighted puzzle sets; we're inspired by the teaching philosophy of small-board capture go, not by copying any specific collection.
What are one-stone variations?
brainGO's original feature: same board ±1 stone, the outcome can flip. The engine computes every variation, showing you "which stone is the key stone." Only 4×4 can be fully solved. See One-stone variations.
How are correct answers guaranteed?
The brainGO algorithmic engine exhaustively solves the 4×4 board (16 points, ~43 million states). Every puzzle's answer is the unique provably optimal move — not anyone's opinion, but a computation result.
Is the companion sprite an AI?
The current sprite is a rule-driven companion character (encourages, celebrates, gives hints), not an LLM conversation. Deeper dialogue may come later.
How is brainGO different from other Go apps?
① 4×4 mini-board (not 19×19 match); ② Engine-verified answers (provable); ③ One-stone variations (original); ④ Companion sprite (encourages, doesn't score); ⑤ All ages (zero number/language barrier). See About brainGO.
Can brainGO prevent dementia or make me smarter?
We don't claim that. Brain games are often marketed as preventing cognitive decline, but the science is inconclusive. What we can honestly say: a daily puzzle gets your brain moving, is satisfying, and is a better way to spend a few minutes than scrolling.
Is brainGO free?
The daily puzzle is free. There's an optional family plan (family pays, seniors get unlimited play + activity logs). The core experience won't be paywalled. See Brain games for adults.
I've never played Go — will I get stuck on day one?
No. brainGO's 4×4 puzzles are designed for total beginners: the rule is a single one (surround to capture), all stones are identical and don't move after placement, and the companion sprite walks you through what happens after your first stone. Most beginners solve their first puzzle in under a minute. You don't need to memorize openings or learn theory — just start with "seeing captures."
How long does one puzzle take? I only have spare moments.
Exactly right for it. A 4×4 capture puzzle averages 10–30 seconds; three puzzles take about two minutes, fitting into the cracks of morning coffee or a commute. brainGO deliberately keeps puzzles short, because "short loops + high frequency" compounds thinking skill far better than "one 30-minute session you soon abandon." Two minutes a day, sustained for months, beats a weekly long session.
Where do I start?
One puzzle. Place a stone. The companion sprite will guide you from there.
👉 Play brainGO — your first capture puzzle