The board above is live. Two people, one device, take turns: that's the whole thing. No menu to get through first, no account to make, nothing to download onto the machine you're using.
One honest note about the word "unblocked": no website can promise it gets past every school or office filter. Those lists are set by whoever runs your network. What this page can do is say exactly what it is and what it loads, so you can judge whether it's likely to get through.
Most of what filters object to on a gaming site isn't the game. It's everything bolted around it: a login wall, a chat window, a friends list, an app you're asked to install. This site has none of that. It's one small web page with a chess board drawn in it, running in the tab you already have open.
There's no account system, so there's nothing to sign into and no email to hand over. There's no chat and no way to be matched with a stranger — the only person you can play is someone sitting next to you or someone you send a link to yourself. Nothing installs: no app store step, no extension, no plugin. And it's one small page load, which a slow school connection handles fine.
One feature does depend on the network: playing someone on a different device. That uses a WebSocket, a long-lived connection the browser keeps open to a server, and it's one of the things stricter filters cut off. If you tap "Play a Friend Online" and the game never connects, that's almost certainly what happened, and there's nothing this site can do from its end.
The rest of it doesn't care. Once this page has loaded, the board runs entirely inside your browser (it's a progressive web app), so it keeps working with the connection off. Two people on one screen can play a full game on a network that blocks everything else.
If the other player is right there, this is the simpler way anyway. One of you moves, you hand the laptop or phone over, they move, you get it back. Every move is checked against the real rules, and checkmate, stalemate and draws are called for you. There's a flip button for when you're sitting opposite each other, so whoever's about to move sees their own pieces at the bottom. 2 player chess offline is the same board written up around that way of playing.
If your friend is on another device, you start a game, send the link, and you're both looking at the same board. Nobody signs up on either end. Worth trying even on a filtered network, since plenty allow it. That's the play chess online with a friend page.
The short version: pawns go straight ahead, bishops on diagonals, rooks in lines, the knight in an L, the queen in both, the king one square at a time. Castling, en passant and pawn promotion are handled for you, so there's no rule to remember mid-game. For a proper walkthrough with a board you can move pieces on, see the chess pieces and how they move.
Often, but nobody can promise it: filters are set per network. This is a plain page with no login, no chat and nothing to install, which is what usually gets a game site blocked, so it stands a better chance than most.
No. There is nothing to sign into and no email to give. Open the page and the board is already there.
Two people on one device, yes. After the page has loaded once it runs in your browser and needs no connection. Playing someone on another device does need one.
Yes, and it's the default here. Take turns clicking or tapping on the same screen — no second device, no link to send.
Online games use a WebSocket connection, which some school and workplace filters block. If it stalls, the board on this page still works for two people on one device.
No. It's a web page. You can add it to a home screen if you like, but that's optional.
Yes. The whole board is free to use, with nothing to buy and no trial.