The game of chess is not merely an idle amusement. Several very valuable qualities of the mind, useful in the course of human life, are to be acquired or strengthened by it.
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[Event "rated untimed match"]
[Site "Stockholm"]
[Date "2014.??.??"]
[Round "?"]
[White "Volkov, Sergey"]
[Black "Grandelius, Nils"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "8/2P2pk1/N1q2bpp/1p2p3/2b5/5PQ1/5P1P/3R2K1 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
{ This is an exceptionally difficult tactic for human players to find. } 1. Rc1 ( { White can try: } 1. Qg4 Be6 2. Qb4 Qxa6 3. Rd8 Bxd8 4. cxd8=Q Qa1+ 5. Kg2 Bh3+ 6. Kxh3 Qf1+ 7. Kg3 Qg1+ 8. Kh3 Qf1+ 9. Kg3 Qg1+ 10. Kh3 Qf1+ { Draw by
repetition of position. } ) 1... Qxa6 2. Rxc4 bxc4 3. Qh3 ( { White can try: } 3. Qg4 h5 4. Qh3 Qa1+ 5. Kg2 Qd4 6. c8=Q Bh4 7. Qhd7 Qxf2+ 8. Kh3 Qxf3+ 9. Kxh4 Qf4+ 10. Kh3 Qf3+ 11. Kh4 Qf4+ { Draw by repetition of position. } ) 3... Qa1+ 4. Kg2 e4 5. c8=Q { White wins with a large material advantage. } 1-0