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Anatoly Karpov vs Mikhail Tal
October Revolution 60th Anniversary (1977), Leningrad URS, rd 12, Jul-10
English Opening: Agincourt Defense. Keres Defense (A14)  ·  1/2-1/2

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
Jan-03-18  Sularus: TN 16. Bxe7 as per CG
Jan-03-18  Sularus: 37. ... Qe5?! [+1.7]

Better was Qe1+

Jan-03-18  Sularus: 42. ... a5?? [+6.3]

Better was Qe6

Jan-03-18  Sularus: 43. Rd5?? [+1.2]

Better was Rg4+

Jan-03-18
Premium Chessgames Member
  shalgo: To amplify on the mutual blunders at moves 42/43: the point is that after 42...a5 43.Rg4+ the d6-square is available to White's queen. (That is why 42...Qe6 was necessary.)

After 43.Rg4+ Kf8 44.Qd6#.

Therefore Black has to play 43...Kh8. Here 44.Qd6 still works, because Black can't take the rook: 44...Qxg4 45.Qxf6+ Kg8 46.Qxd8+

If 44...Qxd7 45.Qxf6#
If 44...Rxd7 45.Qf8#

Therefore, Black has to try 44...Qe6.

According to Stockfish, White can then threaten mate on the h-file to tie up the Black pieces: 45.Qf4 Qe7 46.Qh6 Rg8 47.Rh4 Rg7. After that, White can shift his pieces over to force the win of a queen for the rook: 48.Rd4 Qd8 49.Qe3 Rg8 50.Qe4 Kg7 51.Qd5 Kf8 52.Rc4 (threatening Rc8).

This long line wouldn't be easy to see at the board.

Jan-03-18  Howard: I'll have to check the Informant to see if this game made it in there.
Nov-08-19  Straclonoor: <ccording to Stockfish, White can then threaten mate on the h-file....>

Yes

Analysis by Stockfish 051119 64 POPCNT:

+- (12.43): 43.Rg4+ Kh8 44.Qd6 Qe6 45.Qf4 Ra8 46.Rh4 Kg8 47.Qh6 Qf5 48.h3 Rd8 49.Rg4+ Qxg4 50.hxg4 Rxd7 51.Qxf6 Rd5 52.Qxb6 Kg7 53.Qc6 Rg5 54.Qd7 h6 55.Kg2 Kg8 56.f3 Re5 57.Qd8+ Kg7 58.Qd4 f6 59.Qd7+ Kf8 60.Qh7 Rg5 61.Qh8+ Kf7 62.Qxh6 Ke7 63.Qh7+ Kf8 64.Qe4 Re5 65.Qg6 Ke7 66.Qg7+ Ke6 67.f4 Rc5 68.f5+ Kd6 69.Qxf6+ Kc7 70.g5 Kb7 71.g6 Rc6 72.Qe5 Kb6 73.Kh3

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