On the fields of a chesstable of dimensions $ n\times n$, where $ n\geq 4$ is a natural number, are being put coins. We shall consider a [i]diagonal[/i] of table each diagonal formed by at least $ 2$ fields. What is the minimum number of coins put on the table, s.t. on each column, row and diagonal there is at least one coin? Explain your answer.
1. **Understanding the Problem:**
   We need to place coins on an \( n \times n \) chessboard such that each row, column, and diagonal (with at least 2 fields) contains at least one coin. We aim to find the minimum number of coins required for both even and odd \( n \).

2. **Counting Diagonals:**
   - There are \( 2n - 1 \) diagonals in each direction (from upper left to bottom right and from upper right to bottom left).
   - Excluding the main diagonals (which overlap), there are \( 2n - 3 \) diagonals in each direction that need to be covered.

3. **Initial Coin Placement:**
   - Place coins along the top row and the left-most column, except for the corner square. This uses \( 2n - 4 \) coins.
   - This placement covers all rows except the bottom row and all columns except the right-most column.
   - All diagonals except the main diagonals are covered.

4. **Adjusting Coin Placement:**
   - For each diagonal above the main diagonal (which are covered twice), move one coin to the opposite side of the board:
     - If the coin is in the top row, move it to the same column in the bottom row.
     - If the coin is in the left column, move it to the same row in the right column.
   - Ensure that not all coins are moved from the top row or left column to maintain coverage.

5. **Covering Main Diagonals:**
   - For \( n \) odd: Place one coin in the center of the board.
   - For \( n \) even: Place one coin on each main diagonal.

6. **Conclusion:**
   - For \( n \) odd, the total number of coins required is \( 2n - 3 \).
   - For \( n \) even, the total number of coins required is \( 2n - 2 \).

The final answer is \( \boxed{ 2n - 3 } \) for \( n \) odd and \( 2n - 2 \) for \( n \) even.