Box Claim: dots and boxes rules and winning strategy
Published October 27, 2026 · Updated November 2, 2026
Box ClaimDots and boxes — close a box, go againPlay now
Dots and boxes is won by the player who is forced to give away the smaller chains, not by the one who grabs boxes first. The rules are simple: take turns drawing one line between two neighbouring dots, and whoever draws the fourth side of a box claims it and draws again. The strategy is just as short. Never draw the third side of a box unless you have to, count the chains before the safe lines run out, and when you must give boxes away, give the shortest chain. Below are the rules as Box Claim plays them, the opening, the chain fight at the end, and the double-dealing trick the computer uses on higher levels.
The rules in one minute
Box Claim is the pen-and-paper classic on a small bright board. Players take turns. On your turn you draw one line between two neighbouring dots: tap between them on a phone, or click on a computer, where a faint line shows where the click will go. Close the fourth side of a box and you claim it, the box fills with a star tile in your colour, and you draw again.
That extra turn is the whole game. A box you can close is not just a point, it also keeps you on the move, and a chain of boxes can fall in one go. When the grid is full, the player with the most boxes wins. The board grows from 3×3 to 5×6 as you climb through the levels, and you can also pick 2 players and take turns with a friend on one screen.
Never draw the third side
A box with three sides drawn is a gift: the next player closes it and moves again. So the first rule of the opening is to draw lines that give no box a third side. Every line you add to a box with one side makes it a box with two, and a box with two sides is safe only as long as nobody adds a third.
In the first moves the board is wide open and you can play almost anywhere. Look at the box on each side of the line you are about to draw before you tap. If either of them already has two sides, the line will hand it over. Keep to the lines that touch only boxes with none or one side, and keep playing them for as long as you can. This opening feels slow, but it matters: the safe lines are a shared supply, and the real game starts when the supply runs out.
Count the chains before the safe lines run out
Sooner or later every remaining line gives something away, and that is the moment the game is decided. The boxes on the board have by then formed chains: strings of boxes where claiming one lets you claim the next. Whoever has to draw the first line into a chain gives it to the opponent.
So the question is who runs out of safe moves first, and you can influence it. Before the safe lines are gone, look at the board and count the chains and how long each one is. Long chains decide the game, so try to be the one who receives them. If the number of safe moves left means you will be the one forced to open the first chain, think about a move that changes the parity: a line that joins two short chains into one, or splits one in two, can shift who has to open first.
Do not count only the boxes you can see. A line that looks harmless may be the one that decides the order. When in doubt, take the move that keeps the most safe lines available for your next turn.
When you must give boxes away, give the smallest chain
Once every move gives something away, you stop playing for boxes and start playing for the smallest loss. Open the shortest chain on the board. A chain of one or two boxes costs you very little, while opening a chain of five hands your opponent a big lead and the move that follows.
The same thinking helps when the computer opens a chain for you. You can take every box, but remember that after the last one you must draw again, and that line may open the next chain. Look before you take: sometimes it is better to stop short of the end.
The double-dealing trick
The strongest move in dots and boxes looks like a mistake. When your opponent opens a long chain, you can take all but the last two boxes and then draw the line that leaves those two as a pair for them. They take the pair, but then they must move first and open the next chain for you. You give up two boxes to keep control of everything that follows.
Box Claim's computer learns this trick on higher levels, and it explains the question players ask most: why did the computer leave two boxes to me? Taking them would make you give it the next, longer chain. The answer is to check the cost before you accept. If the rest of the board is a long chain or two, decline the pair when you can, and if you are the one with control, use the trick yourself.
As a rule of thumb, leaving the last two boxes of a chain makes sense when the chains still left are long. If only short chains remain, taking everything and moving on is usually better, because the two boxes you give up are worth more than the control.
Playing a friend and the star ratings
The same ideas work in 2 players. Against a person, the opening is where mistakes happen, because someone will eventually draw a third side without noticing. Watch the box counts on your friend's lines and take what is offered.
In Levels, you earn stars by how clearly you win: three stars need a win by at least a quarter of the board's boxes. Play the opening safely, count the chains early, and use the double-dealing trick when the chains are long, and the margin follows. If you like turn-based board games with a counting puzzle at the end, Seed Bowl is a good next stop.
Seed BowlMancala — sow, capture, fill your storePlay nowFrequently asked questions
How do you win at dots and boxes?
Claim more boxes than your opponent. Avoid drawing the third side of a box, count the chains before the safe lines run out, and give away the shortest chain when you must open one.
Who goes first in Box Claim, and does it matter?
The opening is played with safe lines, so the order matters less than who runs out of safe moves first. Count the safe lines left and the chains that have formed.
Why does the computer leave two boxes to me?
It is the double-dealing move. If you take the two boxes you must move next, and that gives the computer the next, longer chain.
What is a chain in dots and boxes?
A string of boxes where claiming one lets you claim the next. Whoever opens a chain gives it to the opponent, which is why the length of the chains decides most games.
How do I get three stars in Box Claim?
Win by at least a quarter of the board's boxes.
Can I play Box Claim with a friend?
Yes. Choose 2 players and take turns on one screen.