The game solved itself. So we made it louder.
In an age when chess has been computationally solved and the game's competitive mystery largely exhausted, one engineer chose to redirect the question — not toward who wins, but toward how the game feels to witness. By fitting every square of a chessboard with a split-flap display, the kind that once announced departures in grand transit halls, the maker known as e4_user has built something that restores a sense of occasion to each move. It is a reminder that not all human effort seeks efficiency; some of it reaches, quite deliberately, for delight.
- Chess engines have grown so dominant that the game's competitive drama has quietly collapsed — leaving makers to ask what remains worth building around it.
- e4_user's split-flap chessboard answers that question with mechanical theater: tiles clatter and spin with each move, turning a solved game into a sensory event.
- The hardware architecture is genuinely ambitious — an ESP32 orchestrates a cascade of Raspberry Pi Picos, one per rank, translating engine decisions into synchronized physical motion.
- The build is unfinished: five of eight rows are complete, black pieces remain absent, and the board exists in that charged space between serious hobby and full obsession.
- Completion would unlock the project's broader potential — open-source documentation that could let other makers replicate the design and bring the clatter of airport boards to their own game tables.
Chess has always had an uneasy relationship with technology. The moment Deep Blue defeated Kasparov in the 1990s marked something more than a match result — it signaled that the machines had, in a meaningful sense, won permanently. Today, a phone app can summon an engine of crushing strength, and the novelty of that has long since faded. So what remains for someone who loves both chess and making things?
For the maker known as e4_user, the answer was to make the board itself worth watching. Posting to the Arduino subreddit, they revealed a chessboard where every square is a split-flap display — the same satisfying mechanical tiles that once announced flights and departures in busy terminals. Each time a piece moves, the relevant squares flip with an audible clatter, rendering the game in physical motion rather than pixels. It is engineering as atmosphere.
The system is architecturally layered: an ESP32 serves as the central controller, while individual Raspberry Pi Picos handle each rank of eight squares. When the chess engine decides on a move, the signal travels down through the hardware and the flaps spin into place — rapid, rhythmic, hypnotic.
The project is still in progress. Five of the eight rows are built; the black pieces have yet to be added, leaving the board able to show only half the game. It sits in that familiar maker's liminal zone — too far along to abandon, not yet finished enough to share fully.
What the project ultimately represents is an argument about why we build things at all. Chess needed none of this. No split-flap display makes the game stronger or faster. But e4_user built it anyway, drawn to the intersection of a timeless game and a deeply satisfying mechanical interface. When the final three rows are complete and the black pieces take their places, the result will serve no optimized purpose. It will simply be genuinely worth watching — and that, it turns out, is reason enough.
Chess has always occupied an odd corner of the technology world. In the 1990s, computers and humans were locked in a kind of arms race—Deep Blue versus Kasparov, the symbolic moment when silicon finally outthought flesh. Then something shifted. The machines didn't just win; they solved the game entirely. Now you can pull up a chess app on your phone and play against an engine so strong it would have required a room full of supercomputers thirty years ago. The novelty wore off. The competition ended. So what's left?
One engineer decided the answer was to make the game itself more interesting to look at. A maker going by e4_user on the Arduino subreddit built a chessboard where every single square is a split-flap display—the kind of mechanical tile you see flipping on airport departure boards. When a piece moves, the relevant tiles flip with a satisfying mechanical clatter, revealing the new position. It's engineering as spectacle, function married to the pleasure of watching something physical happen.
The board runs on an ESP32 microcontroller as its central brain, with individual Raspberry Pi Picos assigned to each rank—each row of eight squares. When the chess engine calculates a move, the signal cascades down through the hardware, and the flaps spin into place. The effect is hypnotic: the rapid-fire takatakataka sound of tiles rotating, the visual confirmation of each move rendered in mechanical motion rather than pixels shifting on a screen.
The project is not yet complete. As of now, e4_user has finished five of the eight rows needed for a full board. The black pieces are still missing from the build, which means the board can display white's position but not black's. It's a work in progress—the kind of thing that exists in that liminal space between hobby and obsession, where the maker has clearly invested significant time and skill but hasn't quite crossed the finish line.
What makes this noteworthy is not just the technical achievement, though that's real. It's the impulse behind it. Chess doesn't need a new way to be played. It doesn't need split-flap displays or mechanical sounds. But the fact that someone built one anyway, that they saw the intersection of a classic game and a satisfying mechanical interface and decided to spend the hours necessary to make it real—that speaks to something about how we relate to technology. Not everything has to be optimized or solved. Sometimes the point is simply to make something that delights to watch and listen to. When e4_user finishes the remaining three rows and fills in the black pieces, they'll have created something that serves no practical purpose beyond being genuinely cool. That's enough.
Notable Quotes
I recently realized that split-flap displays and chess actually make a pretty great combination, so I started building this project as my first engineering project.— e4_user, Arduino subreddit
The Hearth Conversation Another angle on the story
Why a split-flap display for chess specifically? There are a thousand ways to show a board state.
Because it makes a sound. Because it's mechanical. You can hear the game happening, not just see it.
But doesn't that slow things down? Real chess moves happen instantly in digital form.
It does slow it down. That's the point. It forces you to watch. It makes the move real in a way pixels don't.
The builder is only five rows in. Why leave it unfinished?
It's a first engineering project. That's ambitious. Sometimes you learn what you're doing halfway through and have to keep going.
Do you think they'll open-source the design?
If they finish it, probably. That's how maker culture works. You build something cool, you show people how to build it too.
What does this say about where chess goes next?
It says we're not done with it. We're just done competing against machines. Now we're playing with the form itself.