Per title, I'm wondering when it's a good idea when defending an inferior endgame to seek to trade pieces, and when not to do it.
For example, take this endgame with Black to play:
[FEN "1k2q3/1pp1r3/p2p2p1/P2P3p/5P1P/1PQ3P1/2P5/1K1R4 w - - 3 30"]
With the extra pawn White's position is clearly preferable, but it's not obvious how to make progress, so Black has realistic chances of holding. As Black, is it a good idea to:
- Trade queens?
- Trade rooks?
- Neither, keep all the pieces on the board?
The pure pawn ending is lost, so Black clearly has to keep some pieces on the board to threaten counterplay with. However, which pieces? If Black wants to trade rooks then 1...Re3 forcing 2. Rd3 achieves the trade, but is it a good idea?