A chess game and trainer with a bigger board and side controls on the open Duo
Does ChessLab work on iPhone Duo?
Yes, the developer says so: version 1.9.0, out October 14, 2026, gives the board the open Duo's room, moves the controls beside it and hides the navigation sidebar during play, analysis and training.
- Developer claimedThe developer, in the App Store release notes for version 1.9.0 (released October 14, 2026): open, the Duo takes the iPad layout, with a sidebar of modes and a detail column, and the board takes the full height; the sidebar steps aside during play, analysis and training, and the controls move to the right of the board whenever the display is wider than tall. Closed, it stays in portrait like on any iPhone. The same notes are in the app's source code.
Adapted for the fold
We're waiting on details of exactly what ChessLab changes for the fold. Are you the developer? Tell us.
About ChessLab
ChessLab is a chess game and training app. Version 1.9.0, released October 14, 2026, adapts it to the iPhone Duo, the developer’s notes say: open, the large display takes the iPad layout, with a sidebar of modes and a detail column, and the board takes the full height; the controls move to the right of the board when the display is wider than tall, and the sidebar steps aside during play, analysis and training. Closed, it stays in portrait as on any iPhone.
On the ideas wall
All ideasChessLab: board left, moves and controls right
ChessLab 1.9, from Thierry Maeder, on the open Duo: the board on the left, the moves and controls on the right. This version isn't on the App Store yet; the store still has 1.8.1.
Related guides
iPhone Duo games: what's coming, and what the fold does for play
Which games have been shown on iPhone Duo, how un-updated games look on the open display, and the new kinds of play builders are making with the hinge, the half fold and two screens.
The best iPhone Duo apps so far (October 2026)
The apps worth installing now that iPhone Duo is on sale, from the apps Apple named as launch partners to indie apps whose developers have shown a real iPhone Duo layout, picked for what they do when you open the phone.
Do your apps work on iPhone Duo? What happens before they're updated
Every iPhone app opens on iPhone Duo, but only updated ones fill the inner display. What an app looks like before its developer adapts it, how to tell which are ready, and which popular apps have said so.
Is this your game?
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Sources: Original Duo game and analysis screenshots (github.com) · Thierry Maeder's iPhone Duo implementation commit (github.com) · ChessLab 1.9.0 source release notes (github.com) · ChessLab on the App Store (apps.apple.com)
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