Any pieces that has poor scope or position should be traded quickly.
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[Event "rated untimed match"]
[Site "?"]
[Date "1787.??.??"]
[Round "?"]
[White "Legal"]
[Black "Saint-Bris"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[ECO "C23"]
[TimeControl "0"]
[WhiteElo "0"]
{ Legal's Mate:|This game was played in 1787. It is one of the shortest
and prettiest games ever played. The final position was named after the
winning player, Legal's Mate. } 1. e4 e5 2. Bc4 d6 3. Nf3 Nc6 4. Nc3 Bg4 { We
reach the critical position where the knight on f3 is pinned against white's
queen. However, the pin is not absolute. } 5. Nxe5 { What is this? The knight
moves exposing its queen. } ( { Later in 1929, The French master Cheron was
aware of the incorrectness of the immediate Nxe5 and played this line against
an amateur. } 5. h3 Bh5 6. Nxe5 Bxd1 ( { Better, but still losing is: } 6... Nxe5 7. Qxh5 Nf6 8. Qe2 { Leaving white a whole center pawn up. } 8... Nxc4 9. Qxc4 Qd7 10. O-O Be7 11. d4 O-O ) 7. Bxf7+ Ke7 8. Nd5# ) 5... Bxd1 { Black's greed is
quickly punished. } ( { You don't need to be a grandmaster to see that this line
goes a solid knight up for a pawn. } 5... Nxe5 6. Be2 Bxe2 7. Qxe2 { Black
wins with a large material advantage. } 7... Nc6 8. O-O Be7 9. Qb5 Qd7 10. Qxb7 Rb8 11. Qa6 Nf6 12. Qe2 O-O 13. d3 ) 6. Bxf7+ Ke7 7. Nd5# 1-0