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Ilya M Gurevich vs Kangugi Karanja
New York (USA) (1987)
Alekhine Defense: Modern. Alburt Variation (B04)  ·  1-0

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Nov-01-17  zlatko krezic: Nice and easy!
Nov-01-17  Walter Glattke: Final: 25.-Bxh6 26.Qf7# otherwise e.g. 25.-Rxa1 26.Qxg7# 21.Rxa8 Nxa8 Computer, also possible
21.Nxh7 Rxa1 22.Rxa1 Qe8 23.Nxf8 Kxf8
24.Qg4 Nd7 25.Bxg6 Qd8 26.Qf4+ Nf6 27.exf6 exf6 wins.
Nov-01-17  scholes: 23 qxg6 also wins
Nov-01-17  claudi: 21...Rf5 was the best move for Blacks
Nov-01-17
Premium Chessgames Member
  Once: <Walter Glattke: Final: 25.-Bxh6 26.Qf7#>

The Rf5 is guarding against Qf7#. After 25...Bxh6 the killer move is 26. Qh8#

Nov-01-17  AlicesKnight: Found this fairly quickly; Black's central Ps make a barrier preventing rescue of the beleaguered monarch.
Nov-01-17  Cheapo by the Dozen: Yep. Nice, easy Wednesday. Material is dead even, so refusing the knight is an unpleasant option. And the game line is forcing enough that Black never has a chance to seriously defend g7 (especially not in a way that doesn't then promptly allow a disaster at h8).
Nov-01-17  gofer: Okay, we can start with a knight sacrifice, but I don't think black should accept!

<21 Nxh7 ...>

21 ... Kxh7
22 Qh5+ Kg8
23 Bxg6 Rf6! (Rf5/Rf7 24 Qh7+ Kf8 25 Bh6 mating)

24 Qh7+ Kf8
25 exf6 exf6
26 Rxa8 Ncxa8 (Nbxa8 27 Bh6 wins the queen)
27 Ra1 Nc7 (any other move 28 Rxa8 Nxa8 29 Bh6 wins the queen) 28 Ra7 +-

The queen will be overworked, defending Nc7 and Bg7.

<21 ... Rf5>

This POTD now becomes a much more difficult nut to crack. Black gives up a pawn and an exchange, but avoids losing immediately and potentially undoubles his e pawns.


click for larger view

White is winning at a canter. Stockfish gives the following evaluation (after 6 seconds), but this is hardly the stuff of usual <Wednesday> POTDs.

+6.35 (26 ply)

22.Rxa8+ Ncxa8
23.Ng5 Bh6
24.Nf3 Bxe3
25.Qxe3 Qe8
26.Nh4 Nc7
27.g4 Rf7
28.Bxg6 Qf8
29.Qg5 Qg7
30.Bxf7+ Kxf7
31.Qh5+ Kg8
32.f4 Qh7
33.Qxh7+ Kxh7
34.Kf2 Kg7
35.Nf3 Na4
36.Rb1 Kg6
37.h4 Kh6
38.Ke3 Ne8


click for larger view

Nov-01-17  Lambda: As soon as black is unable to take the knight and is reduced to playing 21 ... Rf5, it's obvious that 21 Nxh7 is right.
Nov-01-17
Premium Chessgames Member
  morfishine: <21.Nxh7+> and if White accepts the sacrifice 21...Kxh7, then <22.Qh5+> (takes advantage of the pin on the g-pawn> and after 22...Kg8, then <23.Bxg6>

*****

Nov-01-17  Walter Glattke: 21.Nxh7 Rf5 22.Rxa8 N6xa8 23.Bxf5 was enough for advantage.
Nov-01-17  The Kings Domain: Nice puzzle, pretty combo.
Nov-01-17
Premium Chessgames Member
  malt: 21 N:h7 K:h7 22.Qh5+ Kg8 23.B:g6 Rf5 24.Qh7+ Kf8 25.Bh6 mating
Nov-01-17
Premium Chessgames Member
  Sneaky: I didn't think about 23..Rh5, but I already got two pawns for my piece; and if the opponent is ready to give up the exchange on top of his new problems, I say the sac worked.
Nov-01-17
Premium Chessgames Member
  whiteshark: What <lost in space> said...
Nov-01-17  Marmot PFL: Easy puzzle, as white has a standard sacrifice, and black has no counterplay as a result of passive opening play (fatal in Alekhine's Defense, which is hard enough for black even with better play).
Nov-01-17
Premium Chessgames Member
  kevin86: The knight sac breaks up black's guard of the king.
Nov-01-17
Premium Chessgames Member
  PawnSac: < FSR: 21.Nxh7 Kxh7 22.Qh5+ Kg8 23.Bxg6 Rf5 (other rook moves, apart from ...Rf7 or ...Rf6, which hang the rook, are met similarly) 24.Qh7+ Kf8 25.Bh6 and wins. >

precisely.. one must see Bh6 also. If black was not able to vacate f8 for the K it would be a monday, possibly tuesday puzzle.

Nov-01-17  BOSTER: <claidi>:<21...Rf5 was the best move for Black>. This is correct. But maybe 20...Re8 and 21...Nf8 protecting h7 pawn was good too.
Nov-01-17  BOSTER: Corrrection:19...Re8 and 20...Nf8
Nov-01-17  cormier: 1) +0.26 (36 ply) 7.exd6 cxd6 8.O-O O-O 9.h3 Nc6(T) 10.Re1 Bf5 11.d5 Na5 12.Na3 Nxb3 13.axb3 Re8 14.c3 a6 15.Be3 e5 16.dxe6 Bxe6 17.b4 d5 18.Bd4 f6 19.Bxb6 Qxb6 20.Nc2 Bf7 21.Qd2 Re4 22.Ncd4 Rae8 23.Nb3 R4e7 24.Rxe7 Rxe7 25.Nc5 Qd6 26.Re1 Rxe1+ 27.Nxe1

2) +0.24 (36 ply) 7.Qe2 Nc6 8.O-O O-O 9.h3 Na5 10.Nc3 Nxb3 11.axb3 h6 12.Re1 Be6 13.Ne4 Nd7 14.Rd1 Qc8 15.Bf4 a6 16.Bh2 dxe5 17.Nxe5 Rd8 18.b4 Nxe5 19.Bxe5 Bxe5 20.dxe5 Rxd1+ 21.Rxd1 Kg7 22.f4 a5 23.bxa5 Rxa5 24.b3 Ra8 25.c4 b6

3) +0.22 (35 ply) 7.O-O O-O 8.exd6 cxd6 9.h3 Nc6(T)

60.0 minute analysis by Stockfish 8

Nov-01-17  cormier: 1) +0.35 (28 ply) 7...O-O 8.O-O Nc6
Nov-01-17  cormier: 1) +0.75 (35 ply) 8.O-O a5 9.a4 O-O 10.h3 Bf5 11.Rd1 Nc6 12.Na3 Qc8 13.Re1 Bd7 14.Be3 Nb4 15.Nb1 Bf5 16.Rd1 f6 17.c3 Nc6 18.Na3 Qd7 19.Re1 Be4 20.exf6 exf6 21.Nh4 Rfe8 22.f3 Bf5 23.Nxf5 Qxf5 24.Qf2 Qe6 25.Nb5 Qd7 26.Bf4

2) +0.66 (35 ply) 8.a4 a5 9.O-O O-O 10.h3 Bd7 11.Re1 Na6 12.Bd2 Nb4 13.Bg5 c6 14.Be3 Na6 15.Qd2 Nc7 16.Nc3 Ne6 17.Ne2 Qc8 18.Nf4 Nc4 19.Bxc4 Nxf4 20.Bf1 Ne6 21.c3 f5 22.exf6 exf6 23.Bd3 Qd8 24.Bh6 Re8 25.Bxg7

60.0 minute analysis by Stockfish 8

Nov-01-17
Premium Chessgames Member
  Bubo bubo: The black queen and knights loiter at the queenside, while the white queen and minor pieces are fueled up and ready to go for a kingside attack, starting with 21.Nxh7:

After 21...Kxh7 (otherwise Black loses at least a second pawn) 22.Qh5+ Kg8 23.Bxg6 Black has to move the Rf8 to lift the threat of Qh7#, but moves like 23...Rfb8 fail to 24.Qh7+ Kf8 25.Bh6 with an unstoppable mate (25...Ne8 26.Bxg7+ Nxg7 27.Qh8#). Hence Black's only chance is 23...Rf6, attacking the bishop, but after 24.exf6 exf6 he is down the exchange and a pawn.

Nov-02-17
Premium Chessgames Member
  ajk68: <patzer2: ...
P.S.: For an improvement for Black, I'd start in the opening. Our Opening Explorer indicates Black has had no success with 7...d5?! 8. 0-0 (+0.87 @ 19 ply, Stockfish 8)>

I ran a deeper analysis as the original was only 19 ply: (+0.75 @ 35 ply, Stockfish 8)

Opening explorer now reflects this.

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