Nested-board redirect
Use a local move to choose the opponent’s next board while competing for a line of won boards.
Shape & spatial thinking
- Players
- 2 players; optional partner advisors
- Time
- 20–35 minutes
- Materials
- Nine 3×3 boards arranged in a 3×3 map, pencils X/O and a destination marker.
Prepare
Label the nine large-board positions A1–C3. Inside every local board use the same A1–C3 labels. X and O alternate marking one empty local cell; nobody moves or erases a previous mark. X’s first move may use any board. Put a destination marker beside the board the next person must use.
Play
The cell just marked chooses the next board by its label. For example X marks inner C1 on board B2; O must now play somewhere on board C1. If O selects inner A3 there, X must go to board A3. The cell address, not the current board address, is what redirects play.
Worked example
Three X or three O in a row, column or diagonal wins that local board for that player. Mark its large-board label with the winner and close all unused cells there. A full local board without a winner closes as a draw, shown D. A closed board cannot receive more marks. If the redirect names any closed board, the next player may choose any open board instead.
Finish and check
Win the entire game by owning three local boards in one large-board row, column or diagonal. A drawn board belongs to neither player. Check for this large line after every local win. If all nine boards close without a large line, the game is a draw. End immediately on a large win; remaining empty cells are irrelevant.
Adaptation and limits
Use a pencil destination marker and speak both addresses aloud before writing. Beginners can practise the two-move B2/C1 then C1/A3 example before resetting. Up to two people may advise each player, but there are only two sides. This is a manual routing game; the sheet has no automatic legality checker or opponent.
Purpose, observation and provenance
Within this activity: Use a local move to choose the opponent’s next board while competing for a line of won boards.
Name a legal action, record the changed state and explain the check. One session does not measure lasting ability.
Our rules, examples and printable diagrams are separately prepared. The earliest inventor of the broader mechanism is not established here.
Free alternative: Copy the supplied grids, labels and cards onto reused paper. No specialist product is needed. Adults may prepare pieces or act as a scribe.
Printable materials
Preview at 100% scale, with browser headers and footers off. Cut with suitable help. Keep host keys separate. This is a manual tabletop kit, not an online opponent, automatic judge or solver.
Rules to keep beside the materials
- Label the nine large-board positions A1–C3. Inside every local board use the same A1–C3 labels. X and O alternate marking one empty local cell; nobody moves or erases a previous mark. X’s first move may use any board. Put a destination marker beside the board the next person must use.
- The cell just marked chooses the next board by its label. For example X marks inner C1 on board B2; O must now play somewhere on board C1. If O selects inner A3 there, X must go to board A3. The cell address, not the current board address, is what redirects play.
- Three X or three O in a row, column or diagonal wins that local board for that player. Mark its large-board label with the winner and close all unused cells there. A full local board without a winner closes as a draw, shown D. A closed board cannot receive more marks. If the redirect names any closed board, the next player may choose any open board instead.
- Win the entire game by owning three local boards in one large-board row, column or diagonal. A drawn board belongs to neither player. Check for this large line after every local win. If all nine boards close without a large line, the game is a draw. End immediately on a large win; remaining empty cells are irrelevant.
- Use a pencil destination marker and speak both addresses aloud before writing. Beginners can practise the two-move B2/C1 then C1/A3 example before resetting. Up to two people may advise each player, but there are only two sides. This is a manual routing game; the sheet has no automatic legality checker or opponent.
Nested-board redirect — play materials
A3
B3
C3
A2
B2
C2
A1
B1
C1
| Large board | Winner X/O or closed draw D |
|---|---|
| A1 | |
| B1 | |
| C1 | |
| A2 | |
| B2 | |
| C2 | |
| A3 | |
| B3 | |
| C3 |
Host check — keep private until finished
Board B2 / cell C1 sends the next move to board C1. A closed destination grants a free choice among open boards. Three owned subboards in a large line wins.
These are model answers or legal examples, not records of an experiment or learner outcomes.
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