Fischer is the strongest player in the world. In fact, the strongest player who ever lived.
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[Event "rated untimed match"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Unknown"]
[Black "Unknown109"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "r7/6P1/5K2/3k4/2pp4/5P2/8/3R4 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Rh1 ( { White can try: } 1. Ra1 Rg8 2. Kf7 Rxg7+ 3. Kxg7 d3 4. f4 c3 5. f5 c2 6. f6 d2 7. f7 d1=Q 8. Rxd1+ cxd1=Q 9. f8=Q { Draw. } ) ( { White can also try: } 1. Rg1 c3 2. g8=Q+ Rxg8 3. Rxg8 c2 4. Rd8+ Kc4 5. Ke5 d3 6. f4 d2 7. Rxd2 c1=Q 8. Rd4+ Kc5 9. Rd5+ Kc6 10. Rd6+ Kc7 { Likely draw. } ) ( { White can also
try: } 1. f4 c3 2. f5 c2 3. Ra1 Rb8 4. Kf7 d3 5. f6 d2 6. g8=Q Rxg8 7. Kxg8 d1=Q 8. Rxd1+ cxd1=Q 9. f7 Qg4+ 10. Kh8 Qh5+ 11. Kg7 Qg5+ 12. Kh8 Qf6+ 13. Kg8 Qg6+ 14. Kh8 Qxf7 { Draw. } ) 1... Rg8 2. Rh8 Rxg7 3. Rd8+ { Hitting black's king
when it cannot advance. } ( { White can try: } 3. Kxg7 c3 4. Rc8 Ke5 5. Kg6 Kf4 6. Rc4 Kxf3 7. Rxd4 Ke2 8. Kf5 c2 9. Rc4 Kd2 10. Ke4 c1=Q 11. Rxc1 Kxc1 { Draw. } ) 3... Kc5 4. Kxg7 c3 5. f4 Kc4 6. f5 d3 7. f6 d2 8. f7 c2 9. f8=Q d1=Q 10. Qf7+ Kb4 11. Qb7+ Kc3 12. Qc7+ Kb2 13. Qb6+ Kc3 14. Qc5+ Kb2 15. Qb4+ Kc1 16. Qa3+ Kb1 17. Rb8# 1-0