The concept of good bishops and bad bishops is something very minor that can make a significant advantage or even winning the game. So, what did i mean by good and bad bishops? Taking a look at this position below, white's bishop is very bad. What do i mean about this? Look at white's pawns, they are all fixed on dark squares and white has a dark squared bishop. The pawns block the bishop from ever getting into the Black position. This technically doesn't lower the bishop's true value in points but his value indirectly diminished because of the pawns. Now take a look at Black's dark squared bishop. He is considered the good bishop. Black's pawns are fixed on light squares meaning that they don't get in the way of the bishop. This gives great light square control by the pawns and great dark square control by the bishop. White does have excellent dark square control but is very weak on the light. Due to having the better bishop, black was able to capture the H pawn and win the game.
The concept of good bishops and bad bishops is something very minor that can make a significant advantage or even winning the game. So, what did i mean by good and bad bishops? Taking a look at this position below, white's bishop is very bad. What do i mean about this? Look at white's pawns, they are all fixed on dark squares and white has a dark squared bishop. The pawns block the bishop from ever getting into the Black position. This technically doesn't lower the bishop's true value in points but his value indirectly diminished because of the pawns. Now take a look at Black's dark squared bishop. He is considered the good bishop. Black's pawns are fixed on light squares meaning that they don't get in the way of the bishop. This gives great light square control by the pawns and great dark square control by the bishop. White does have excellent dark square control but is very weak on the light. Due to having the better bishop, black was able to capture the H pawn and win the game.