Put the screen in the middle
Chess does not need two phones. Sit together, let White move first, then pass the device. You can stop to talk about a move without a clock shouting at you.
One device, two sides
White moves first. After a move, the board waits for the other color. No internet is required, which makes it easy at a table or on a sofa.
Teaching is allowed to be slow
If you are showing someone the pieces, undo a move and try the idea again. The board can be a serious game or a position you keep rearranging.
The same rules as a tournament set
Castling, en passant, and promotion work on this board. You are not playing a simplified cousin of chess.
2people, one device
0network required
8×8full board
Undowhen you want to talk