In chess, we use a "Point System" to determine if a trade is good or bad. If you give up a Rook (5 points) to capture a Knight (3 points), you have lost material. Here is the standard valuation system used by masters.
| Piece | Points | Strength |
|---|---|---|
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1 | The basic unit. Strong in groups. |
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3 | Jumps over pieces. Good in closed positions. |
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3 | Long range. Good in open positions. |
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5 | Very powerful on open files. |
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9 | The powerhouse (Rook + Bishop combined). |
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∞ | Invaluable. If lost, game over. |
Although both are worth 3 points, experienced players often value the Bishop slightly higher (e.g., 3.25) in "Open Positions" where the board is clear of pawns.
"Winning the Exchange" means you captured a Rook (5) while only losing a minor piece like a Knight or Bishop (3). This gives you a significant +2 point advantage.
No! Points are just a mental tool for making decisions. You do not win by reaching 20 points. You win by Checkmate. It is possible to be "down in material" but still deliver a checkmate.