Only Way to Grow
This part-found ship can only continue one way — every ship still in the fleet that could cover it agrees on where it goes.
How it works
- 1Suppose every submarine is already placed, so the smallest ship still missing is 2 cells long — which means this lone cell is only part of a ship, not a whole one.
- 2Its diagonals are already water, so Diagonal Water has nothing left to say here.
- 3It has water above, below and to its left, and a ship can't bend, so whatever covers it must run to the right.
- 4The 2-ship and the 3-ship both start it the same way, so the cell to its right is ship whichever one this turns out to be.
- Ship segment
- Water
- Cells that establish the pattern
- Where the conclusion lands