Do you realize Fischer almost never has any bad pieces? He exchanges them, and the bad pieces remain with his opponents.
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[Event "rated untimed match"]
[Site "USSR"]
[Date "1974.??.??"]
[Round "?"]
[White "Sapkin"]
[Black "USAEV"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "r4Nk1/1p2pp1p/p1np2p1/3N4/P3PPn1/8/1bPKBqPP/R2Q1R2 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
{ A classic blockade tactic. } 1... Qd4+ 2. Bd3 ( { White can try: } 2. Ke1 Bc3+ 3. Nxc3 Qxc3+ 4. Qd2 Qxa1+ 5. Qd1 Qxd1+ 6. Bxd1 Nf6 7. Nxh7 Kxh7 { Black wins
with a large material advantage. } ) 2... Bc3+ 3. Ke2 ( { White dare not try: } 3. Nxc3 Qe3# ) ( { White can try: } 3. Kc1 Bxa1 { Black wins with a large material
advantage. } ) 3... Qe3+ { Making the knight blockade his king. } 4. Nxe3 Nd4# 0-1