Two types of pieces, bishops and rooks, are to be placed on a $10\times 10$ chessboard (without necessarily filling it) such that each piece occupies exactly one square of the board. A bishop $B$ is said to [i]attack[/i] a piece $P$ if $B$ and $P$ are on the same diagonal and there are no pieces between $B$ and $P$ on that diagonal; a rook $R$ is said to attack a piece $P$ if $R$ and $P$ are on the same row or column and there are no pieces between $R$ and $P$ on that row or column.
A piece $P$ is [i]chocolate[/i] if no other piece $Q$ attacks $P$.
What is the maximum number of chocolate pieces there may be, after placing some pieces on the chessboard?

[i]Proposed by José Alejandro Reyes González[/i]
To solve this problem, we need to determine the maximum number of pieces on a $10 \times 10$ chessboard such that no piece attacks another. We will use the definitions of how bishops and rooks attack other pieces to guide our placement strategy.

1. **Understanding the Attack Mechanism:**
   - A bishop attacks any piece on the same diagonal unless there is another piece in between.
   - A rook attacks any piece on the same row or column unless there is another piece in between.

2. **Strategy for Placing Pieces:**
   - We need to place pieces in such a way that no piece is attacked by another. This means we need to ensure that no two pieces share the same row, column, or diagonal without an intervening piece.

3. **Optimal Placement:**
   - Consider placing rooks on all the black squares of the chessboard. Since the chessboard is $10 \times 10$, it has 100 squares, half of which are black (50 black squares).
   - If we place a rook on each black square, no two rooks will share the same row or column because the black squares are arranged such that no two black squares are in the same row or column.

4. **Verification:**
   - Since rooks are placed on black squares, they do not attack each other as they are not in the same row or column.
   - Bishops are not placed on the board, so there are no diagonal attacks to consider.

5. **Maximum Number of Chocolate Pieces:**
   - By placing rooks on all 50 black squares, we ensure that all 50 rooks are chocolate pieces (i.e., no piece attacks another).

6. **Tiling Argument:**
   - To confirm that 50 is indeed the maximum, consider any $2 \times 2$ square on the chessboard. In any $2 \times 2$ square, there can be at most 2 chocolate pieces because placing more would result in at least one piece being attacked.
   - The $10 \times 10$ chessboard can be divided into 25 disjoint $2 \times 2$ squares. Each of these squares can contain at most 2 chocolate pieces, leading to a maximum of $25 \times 2 = 50$ chocolate pieces.

Thus, the maximum number of chocolate pieces on a $10 \times 10$ chessboard is 50.

The final answer is $\boxed{50}$.