Bishop versus knight

Bishop versus knight describes a lasting difference in the available pieces that gives each side different plans. The pieces are usually assigned similar value, but they work differently. A bishop acts at long range and can move quickly from one side of the board to the other, although it controls only one color of square. A knight jumps over pieces and can reach squares of both colors over successive moves, but it needs time to cross the board.

Open positions with few pawn barriers and play on both sides of the board often favor the bishop. A closed position may favor the knight because it can jump over blockades. These are guides, not verdicts: a bad knight with no useful route may be inferior to a bishop even in a closed center, while a bishop blocked by its own pawns may perform worse.

Factors to compare

• Stable squares for the knight and the time needed to reach them.
• Open diagonals for the bishop and its ability to attack targets on both wings.
• The color of fixed pawns, which cannot easily advance or be exchanged: a bishop can attack enemy pawns on its color, while friendly pawns on that color may restrict it.
• King activity, passed pawns, meaning pawns with no enemy pawn ahead on the same or adjacent files, and the possibility of changing the pawn structure.

The bishop's plan often opens lines, creates distant targets, and plays on two wings. The knight's plan often closes lines, blockades pawns, and occupies a protected central square. Every exchange and pawn move can change the evaluation.