In short
Pieces are worth different amounts. A pawn is 1, a knight or bishop 3, a rook 5 and the queen 9. The king can’t be traded, so he has no number.
What you learn here
- Pawn 1, knight and bishop 3, rook 5, queen 9.
- Take the free piece, or the bigger one.
- When you’re ahead, trade pieces.