A board split across two screens
Chess on two phones and checkers split the 8 × 8 between two phones laid top edge to top edge: each phone shows its own player's 8 × 4 half, your pieces nearest you, and a move can land on the other screen. Prefer to see everything? Whole board shows all 64 squares on both phones, each turned to its own player.
Islands is played differently: each phone shows the whole sheet of grid paper and scrolls and zooms it on its own, so the phones don't need to touch.
The rules you know
Chess is classic chess, with castling, en passant and promotion, and it also plays three on a hexagon. Checkers offers Russian rules by default, where men capture backwards and kings fly, or English draughts. Islands is the dots game played on grid paper: place dots in turn, ring the other player's dots, and each capture scores more the bigger it is.
All three have a move timer, and Chess and Checkers add an optional chess clock of 5, 10 or 15 minutes each.
One screen, or the computer
No second phone? Every board game here plays pass and play on one device, and the board never turns, so nobody has to pick it up. Playing alone, add a bot: each game has one that moves after a short pause.
A friend far away can still play. In Chess and Checkers their device shows the whole board, and in Islands everyone has their own view of the sheet anyway: send them the table's link or its four-letter code.
Questions
Can we play chess on two phones?
Yes, lay them top edge to top edge and each shows its own half of the board, or pick Whole board to see all of it on both.
Can three people play?
Yes, Chess plays three on a hexagonal board, and Checkers plays three or four.
Can I play against the computer?
Yes, every game here has a bot that moves after a short, human-like pause.
Do we need accounts?
No, open bigboard.games and play; nobody signs up.