FIXED PRACTICE BOARD
Tents & Trees study 8
Solve at your own pace. Ask what follows from the position before applying the suggested move.
| C11 | C21 | C31 | C41 | C50 | C62 | |
|---|---|---|---|---|---|---|
| R11 | ||||||
| R21 | ||||||
| R31 | ||||||
| R42 | ||||||
| R50 | ||||||
| R61 |
Loading interactive controls…
Work from the current board
Activate a non-tree square to cycle unknown → tent → grass.
Tab to any control and use Enter or Space.
Interactive help is separate from the written starting-board solution below.
What did this solve teach?
You met the complete win condition. Compare the written route below with your own moves. Identify one deduction you can explain without looking at the answer, and one place where a changed mark could invalidate the next conclusion.
Rules and proof limits
Put one tent beside each tree, directly above, below, left or right. Each tent belongs to one different tree. Tents cannot touch, even diagonally. The row and column counts give the required number of tents. Mark grass where a tent cannot go.
An adjacent tree is necessary for a tent but does not prove the square must contain one. A tent beside two trees cannot serve both. Completed counts and non-touching tents still require a valid one-to-one matching. The introductory exercises do not teach every matching deduction needed by harder boards.
Show the checked route from the starting position (9 steps)
This route starts from the original study position. It does not describe moves you made differently. Use “Explain a next step” for a deduction from your current marks.
- A row or column clue of zero allows no tents. Mark R2C5, R3C5, R4C5, R5C1, R5C2, R5C4, R5C5, R6C5 as grass; tree squares stay unchanged.
- R1C1, R1C2, R2C1, R2C2, R2C3, R2C6, R3C2, R3C3, R3C4, R3C6, R4C4, R6C4 have no tree directly above, below, left or right. A diagonal tree is not sufficient, so these squares are grass.
- Row 2 needs 1 tents and already has 0. Its 1 remaining candidate square must all be tents because every candidate is needed.
- The tent at R2C4 excludes all touching squares, including diagonals. Mark R1C3 as grass.
- Row 1 needs 1 tents and already has 0. Its 1 remaining candidate square must all be tents because every candidate is needed.
- Row 3 needs 1 tents and already has 0. Its 1 remaining candidate square must all be tents because every candidate is needed.
- The tent at R3C1 excludes all touching squares, including diagonals. Mark R4C2 as grass.
- Row 4 needs 2 tents and already has 0. Its 2 remaining candidate squares must all be tents because every candidate is needed.
- Column 2 needs 1 tents and already has 0. Its 1 remaining candidate square must all be tents because every candidate is needed.
| C11 | C21 | C31 | C41 | C50 | C62 | |
|---|---|---|---|---|---|---|
| R11 | ||||||
| R21 | ||||||
| R31 | ||||||
| R42 | ||||||
| R50 | ||||||
| R61 |
Final check
Row and column counts match, tents do not touch, and a complete one-to-one assignment exists between trees and adjacent tents.