The third side is the whole game
How to play Dots & Boxes with a friend
- Draw one lineTap the gap between two dots. That is your move; then it is your rival's.
- Close a boxThe line that completes a box's fourth side claims it for you.
- Draw againClosing a box gives you another line straight away — and closing another gives you another.
- Fill the fieldTwenty-five boxes on a standard board. The game ends when the last one is claimed.
- Count them upMore boxes wins. Equal is a draw.
Never draw the third side
A box with two sides is safe. A box with three is a gift: whoever moves next closes it, gets another move, and often closes the next one too. The opening is a long, polite refusal to be the one who draws a third side anywhere.
Eventually every safe line is gone and someone has to give. That moment — who is forced to open the first chain — is what the whole opening has been about.
Chains: why a gift is sometimes a trap
Boxes join into corridors. Open one and your rival can run down the whole chain, closing box after box in a single turn. That is how a game swings 13–12 to 20–5 in one move.
The strong reply is the double-cross: take all but the last two boxes of a chain, then draw the line that hands those two back. Your rival gets two boxes and has to open the next chain for you. Giving up two to win the next eight is the best trade on the board.
Count the chains, not the boxes
Once the safe lines run out, the game is decided by how many long chains there are and whose turn it is. An odd number favours one player; an even number the other. Skilled players spend the opening steering that count.
You do not need the theory to enjoy it. But the first time you see a chain coming three moves early and hold it shut, the game changes shape.
Three things that actually help
- Keep every box at two sides or fewer until you cannot. The player who runs out of safe lines first loses tempo.
- Before you close a long chain, check what you are opening next. Leaving the last two boxes can be worth more than taking them.
- A closed box is a free move. Chain them, but do not forget the move at the end of the chain still has to go somewhere.
Dots & Boxes questions
Do I have to draw again after closing a box?+
Yes — the extra line is part of the move, not a choice. Sometimes that is the problem: the line has to go somewhere.
How big is the board?+
Five boxes by five, twenty-five in all, on a six-by-six grid of dots.
Does my friend need to be online?+
No. Draw your line and put the phone down; they are told it is their turn and answer when they like. Or catch each other online and play it out in one sitting.