Which is more valuable: Bishop or Knight?

hem so difficult to knew value the knight and bishop ?

but i think we needed to know the situation about the games

if you got the large position you have to use of the Bishop

if you got the not large position you have to use of the Knight

but it's so not easy to decide the situation Ok

Nimzovich said "Develop the Knights in open games rather than Bishops"

Ok what is the valuable in here just you and the situation

FIDE value

1.Bishops = 3 -> because this can hold the 3 Pawns

2.Knigth = 3 -> because this can hold the 3 Pawns

Bishop, if you have both of them

stwils

I must admit I do like knights but it all depends on the position ... because if all the pawns are on the same side in an end game knights tend to be very useless! I am not very good with my bishops either

Cool. But knights still rule!

I would say go with the average value that guides you to better decision making.

  "World Correspondence Chess Champion Hans Berliner gives the following valuations, based on experience and computer experiments:

• knight = 3.2
• bishop = 3.33" 
  

http://en.wikipedia.org/wiki/Chess_piece_relative_value

So, until my ability to judge a piece's relative value improves, I like to think in terms of 3 1/4 pawns per minor piece.  Otherwise I might make a bad exchange like trading 2 minor pieces (3+3) for a rook and pawn (5+1) in the early middlegame.