The plan of a picture gallery is a chequered figure where each square is a room, and every room can be reached from each other by moving to rooms adjacent by side. A custodian in a room can watch all the rooms that can be reached from this room by one move of a chess rook (without leaving the gallery). What minimum number of custodians is sufficient to watch all the rooms in every gallery of $n$ rooms ($n > 1$)?
1. **Coloring the Polyomino:**
   - We start by 2-coloring the polyomino according to the parity of the sum of coordinates of each tile. This means that tiles sharing a side will get opposite colors.
   - Let's denote the two colors as black and white. Each tile will be either black or white, and adjacent tiles will have different colors.

2. **Placing the Rooks:**
   - We choose the color with the smaller number of tiles. Since the polyomino is connected, the number of tiles of each color will differ by at most one.
   - We place rooks on all tiles of the chosen color. This ensures that there are at most $\lfloor \frac{n}{2} \rfloor$ rooks, where $n$ is the total number of tiles.

3. **Guarding the Tiles:**
   - Because the polyomino is connected, every tile shares a side with at least one other tile. Therefore, every tile is guarded by at least one of the rooks placed on the chosen color tiles.

4. **Constructing a Polyomino Requiring $\lfloor \frac{n}{2} \rfloor$ Rooks:**
   - For every positive integer $n$, we can construct a polyomino such that the minimum number of rooks needed to guard it is $\lfloor \frac{n}{2} \rfloor$.
   - For even $n = 2m$, we construct a polyomino with one center column and individual tiles attached on either side, alternating between left and right.
   - For odd $n = 2m+1$, we construct a polyomino by placing a tile on the bottom-most part of the center column of the polyomino with $n-1$ tiles.

5. **Verification:**
   - In the constructed polyomino, there are exactly $\lfloor \frac{n}{2} \rfloor$ tiles not in the center column, and no two of these can be guarded by the same rook.
   - This proves that $\lfloor \frac{n}{2} \rfloor$ rooks are necessary and sufficient to guard the polyomino.

\[
\boxed{\lfloor \frac{n}{2} \rfloor}
\]