Match the winning target to the board size
On a 3×3 board, three matching marks in a row win. On 6×6, the target is four. On 11×11, it is five. You do not need to fill an entire row of six or eleven cells. A winning run may occupy only part of a row, column or diagonal.
These are the board formats and rules used in Happy Games. X starts a normal empty-board match, and the players alternate placing one mark in an empty cell. Existing marks stay where they are. A completed winning line ends the match immediately; if the board fills without one, the result is a draw.
| Board | Target | Still too short |
|---|---|---|
| 3×3 | 3 in a row | 2 in a row |
| 6×6 | 4 in a row | 3 in a row |
| 11×11 | 5 in a row | 4 in a row |
Count consecutive marks, not every mark nearby
A winning line runs horizontally, vertically or diagonally in either direction. Every cell in the run must contain the same player's mark. An empty cell or the opponent's mark interrupts it. Four X marks scattered across a 6×6 board are not a win, and a row containing X, X, an empty cell and X has a gap that must be filled.
Lines do not turn corners. An L-shaped group does not count as one continuous run, and marks at opposite edges do not connect around the board. When checking a move, look along its row, column and both diagonals. Count the connected marks on both sides of the new cell: filling a gap can join two shorter groups.
Set up the same gap on both larger boards
For the examples in this guide, label columns from left to right: a to f on 6×6, or a to k on 11×11. Number rows from bottom to top, starting at 1. These are our explanation coordinates; a3 is the leftmost cell in the third row from the bottom.
Start an empty board and follow this alternating sequence: X a3 → O f6 → X b3 → O f4 → X d3 → O f2. All six moves are legal on either larger board. It is now X's turn. X occupies a3, b3 and d3; O occupies f6, f4 and f2. Every other cell is empty.
Along row 3, from a3 through f3, the cells contain X, X, empty, X, empty, empty. The missing c3 separates a3–b3 from d3. This is an illustrative sequence, not a forced opening: O's choices deliberately leave the gap available.
On 6×6, X c3 completes the game
Place X on c3. The new mark joins a3–b3 to d3, making the consecutive run a3–b3–c3–d3. Its length is four, so X wins immediately on 6×6. The empty cells e3 and f3 do not matter: the winning segment does not have to reach the right edge.
Notice what changed. X already had three marks in this row, but they were split into groups of two and one. Placing a fourth mark somewhere else would not necessarily win. The decisive cell is c3 because it connects the existing groups into one uninterrupted line.
On 11×11, the same c3 move is only a threat
Replay the same six opening moves on 11×11, then place X on c3. X again has a3–b3–c3–d3, but four is below this board's target of five. The game remains active and it is O's turn. X cannot place a second mark immediately to finish the line.
If O now chooses k11, X can answer on e3. The run a3–b3–c3–d3–e3 contains five X marks, so that move wins. O k11 is an example of missing the threat, not an unavoidable reply. O could instead occupy e3 and stop this particular completion.
There is no cell to the left of a3, so e3 is the only one-move extension of this horizontal run. Blocking e3 prevents this row from winning on X's next turn, but it does not establish the eventual result of the whole game. Other moves and future lines still have to be assessed.
| After X c3 | 6×6 | 11×11 |
|---|---|---|
| Connected X marks | 4 | 4 |
| Required length | 4 | 5 |
| Game state | X wins | O to move |
| What happens next? | The match is over | O can block e3 |
A longer run also counts
The target is a minimum, not an exact-length limit. Joining five marks on 6×6 still wins because the run includes at least four consecutive marks. The same principle applies to a run longer than five on 11×11.
To see how a longer run can appear without an earlier win, start a separate 6×6 game: X a3 → O f6 → X b3 → O f4 → X d3 → O f2 → X e3 → O a6. X now has two separate pairs, a3–b3 and d3–e3. Neither is long enough to win. X c3 joins them into five consecutive marks from a3 to e3, and X wins on that move.
An opponent's mark in c3 would behave differently from an empty gap. You cannot replace it, and it would keep the two X groups separate along this row. Count only the uninterrupted segment on each side; adding their sizes across O would give a false winning total.
Check immediate wins before planning a longer line
Before moving, check whether you can reach the current board's target now. Then check whether your opponent has a one-move completion. On 6×6 a run of three with a usable finishing cell is an immediate threat; on 11×11 the corresponding threat needs four. A gap inside a line can be just as urgent as an open end.
Do not automatically transfer a 3×3 tactic to a larger board. The larger target and extra cells change which moves threaten an immediate win. Our earlier guide on 3×3 forks explains two simultaneous finishing squares; here the first job is to identify the correct target and count the actual consecutive marks.
The guided demo and “New 3×3 game” below use the small board. They are useful for practising turns and line recognition, but they do not reproduce these 6×6 and 11×11 examples. For the larger formats, open Happy Games in Telegram, choose Tic-Tac-Toe and select the board size.