Checkmate the Competition: Front Row Puzzle Solution?

1. Chess pieces that can only move forward
2. They’re the first line of defense on a chessboard
3. They’re usually sacrificed to protect more valuable pieces
4. The most numerous pieces on a chessboard
5. They can be promoted to higher-ranked pieces if they make it to the end of the board
6. They’re often used to block opponents’ moves
7. They can only capture diagonally