Good Knight, Bad Bishop
Bishops and Their Color
Each bishop travels only on squares of one color — a light-squared bishop never touches a dark square, and the reverse for the dark-squared bishop. A bishop is happiest on long, clear diagonals where it can reach across the whole board.
What Makes a Bishop Bad
A bad bishop is one whose own pawns sit on the same color squares it travels on. Those pawns block its diagonals, so it can barely move. It ends up defending pawns instead of attacking, peering at its own roadblocks like a prisoner behind bars.
Crucially, a bishop is not bad just because it is hemmed in for a moment. It is bad when your fixed pawn chain permanently locks it in. If you can free those pawns or trade the bishop off, the problem disappears.
Why a Knight Can Be Better
Knights do not care about open diagonals — they hop. In a closed position full of locked pawns, a nimble knight can route to strong squares while the bad bishop sits useless. A good knight versus bad bishop imbalance is one of the most reliable long-term edges in chess.
Using or Avoiding the Imbalance
If you have the good knight, keep the position closed so the bishop stays buried, and steer your knight toward a secure square in the enemy camp. If you are saddled with the bad bishop, try to trade it for an enemy piece, or push the pawns that block it onto the opposite color.
A simple guideline: place your pawns on the opposite color of your own bishop. That keeps your diagonals open for the bishop and leaves the other color squares guarded by the bishop itself.