Alekhine vs Koenig
[Event "Vienna"] [Site "?"] [Round "0"] [White "Alekhine"] [Black "Koenig"] [Result "1-0"] [ECO "A50"] [Opening "Indian: Queen's Indian Accelerated"] 1. d4 Nf6 2. c4 b6 {A move of doubtful value since Black will be unable to stop White from gaining control of the center with pawn e4. Better was 2... e6 which prepares for a future fight for the central square d5.} 3. Nc3 Bb7 4. Qc2 {After this move Black will be unable to prevent White from gaining control of the center with pawn e4.} 4... d5 5. cxd5 Nxd5 6. Nf3 {Before gainin g the pawn center with e4 White first stops any counterplay Black might get if he can advance his pawn from e7 to e5.} 6... e6 7. e4 Nxc3 8. bxc3 Be7 9. Bb5+ c6 10. Bd3 O-O 11. e5 { White uses his better development to start a kingside attack.} 11... h6 12. h4 {With the idea of bringing the rook into the attack with Rh3 followed by Rg3.} 12... c5 {12...Nd7 13.Ng5 c5 14.Bh7+ Kh8 15.Bg8 With the threat of mate on h7 would bring White material rewards.} 13. Rh3 {13.Ng5 cxd4 14.Bh7+ Kh8 15.Bg8 d3 would block the mate on h7 while winning the bishop trapped on g8.} 13... Kh8 {Black removes his king from the g-file. However, it's not enough to save the king.} 14. Bxh6 { With no Black pieces to defend the king White removes Black's pawn cover.} 14... f5 {14...gxh6 15.Qd2 By threatening 16.Qxh6+, White wins material for example 15...Kg7 16.Rg3+} 15. exf6 Bxf6 16. Bg5 { White has won a pawn while keeping his kingside initiative.} 16... cxd4 17. Ne5 {This move takes advantage of Black's dark squared bishop being pinned to the queen.} 17... Nc6 18. Qe2 g6 { 18...Nxe5 would allow White a forced mate in four.} 19. Bxg6 Kg7 20. Bh6+ Kg8 { 20...Kxh6 would allow White a forced mate in two.} 21. Nxc6 { White trades down to a winning ending.} 21... Bxc6 22. Qxe6+ Kh8 23. Bxf8 Qxf8 24. Qxc6 {Black resigned since he is a rook down with no compensation.} 1-0
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OpeningA50 — Indian: Queen's Indian Accelerated