Ninefold Tactics: think on two boards at once
Ninefold Tactics contains nine small tic-tac-toe boards. A move may win or block a local line, but it also chooses the next small board for your opponent. Every move therefore has two consequences.
| Left column | Centre | Right column |
|---|---|---|
| Upper-left | Upper-centre | Upper-right |
| Middle-left | Centre | Middle-right |
| Lower-left | Lower-centre | Lower-right |
The square’s position corresponds to the next small board’s position.
Where your opponent goes next
The position of the square you choose in a small grid indicates the position of the small board where your opponent must play. Choosing the centre sends them to the centre board. Choosing the upper-right square sends them to the upper-right board of the large grid.
Before clicking, inspect that destination board too. Can the opponent complete a local line there immediately? Might it send you back to a useful board? When the indicated board is already won or full, the opponent can choose any open board.
Local wins must form a large line
The goal is not to collect as many unrelated small wins as possible. Three won boards must align in a row, column or diagonal of the large grid. Before spending a move on a local attack, check whether that board belongs to a large line you can still complete.
For example, two won boards in the top row make the third top board especially valuable. A local win elsewhere may look attractive, but it does not end the match unless it completes a line in the large grid.
A quick check before each move
Ask three questions: does this move prevent an immediate local loss, which board will it send the opponent to, and does it help form a line of three won boards? This gives structure without calculating the entire game tree. If the destination board is closed, account for the opponent’s free choice instead of assuming they must play where you want.