- Is the position open or closed? If it's closed I may prefer to own the knights. If it's open the bishops may be a good bet.
- Will there be support points available for his knights. If there are, then other questions arise:
- can his knights get to them?
- if the knights do get to these squares, does it matter? in other words, if his support point is on the queenside but all the play is taking place on the kingside then you would actually encourage him to stick hi knight on that far away post!
- can the bishops reach similar or superior squares?
Be sure to answer these questions before the trade.