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 "?"]
[Date "????.??.??"]
[Round "?"]
[White "Svacina"]
[Black "Muller"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[ECO "A02"]
[FEN "8/8/4k3/2Kp1p1p/3Pp1p1/4P1P1/5PP1/8 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... f4 2. exf4 ( { White can try: } 2. gxf4 h4 3. f5+ Kxf5 4. Kxd5 h3 5. gxh3 gxh3 6. Kc6 h2 7. d5 h1=Q 8. d6 Ke6 9. d7 Qc1+ 10. Kb5 Kxd7 { Black wins with
a large material advantage. } ) 2... h4 3. gxh4 ( { White can try: } 3. f5+ Kxf5 4. Kxd5 hxg3 ( 4... h3 5. gxh3 gxh3 6. g4+ Kxg4 7. Kxe4 h2 8. f3+ Kg3 9. d5 h1=Q { Black wins with a large material advantage. } ) 5. fxg3 e3 6. Kc6 e2 7. d5 e1=Q 8. d6 Ke6 9. d7 Qc3+ 10. Kb5 Kxd7 { Black wins with a large material
advantage. } ) 3... g3 4. fxg3 e3 5. h5 e2 6. h6 e1=Q { Black wins with a large
material advantage. } 0-1