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Devaki V Prasad vs Krishnamoorthy Murugan
India (1992)
Caro-Kann Defense: Advance Variation. Van der Wiel Attack (B12)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
Apr-10-21  stacase: I got the first two moves, the Rook is the living dead so what to take on the way out? Looks like 18.Rxf7 does the most damage. And then 19.Nxf5 seems to be in order but then 20.Nh6+ or 20.Ne7+? I went with 20.Ne7+ maybe I should have reasoned that 20.Ne7+ puts White's Knight closer to the center of the board. Well anyway I was happy to get the first two moves on a Saturday.
Apr-10-21
Premium Chessgames Member
  al wazir: I got the first two moves too. But the tricky part is the sequel.

Even though the game lasted another 15 moves, black is helpless because all his pieces are in the wrong place! I've looked at a lot of alternative lines, and nothing saves the defense.

Apr-10-21  ajax333221: I spent like 5 minutes looking into every possible move and found nothing until I finally see the potential for the Rook sac.

However my initial idea was: 18. Rxf7 Kxf7 19. Bd8

Attacking the Queen with the Bishop in hopes that freeing the g5 square with a tempo for the f3 Knight to jump into the battle.

I guess this was not as good as the main line, well I tried and at least got the first move.

Apr-10-21
Premium Chessgames Member
  An Englishman: Good Evening: White might have known about Botvinnik vs Portisch, 1968, and when his opportunity for brilliance arrived did not fail to seize the moment. The Big Question: when did White conceive of the sacrifice? Whilst contemplating 14.Rxb7? Or was it an act of desperate inspiration after 16...Nc4?
Apr-10-21
Premium Chessgames Member
  opus: 18. Rxf7 Kxf7 19. Nxf5 g6 20. Nd6+ Kg7 21. Qf7# or 18...Kxf7 19. Be7 Bxe7 20. Ng5+ Kg8 21. Nxf5 exf5 22. Qxf5 Bf6 23. exf6 gxf6 24. Qe6+ Kf8 25. Re1 Ne3 26. Rxe3 Re8 27. Qxf6+ Kg8 28. Rxe8#
Apr-10-21  Brenin: The R on c7 is doomed, and it was not hard to see that it can do the most damage to Black's position with 18 Rxf7 Kxf7 19 Nxf5, since 19 ... exf5 allows 20 Qxf5+ Kg8 (Ke8 21 Qe6+ followed by mate) Kg8 21 Qe6+ Kh7 22 Bc1!, preventing Qb2 and threatening Ng5 mate). What to do if Black declines to recapture on moves 18 or 19 was less obvious, and I had to rely on instinct that White had enough to win.
Apr-10-21  Walter Glattke: 18.Rxf7 Kxf7 19.Nxf5 exf5 20.Qxf5+ Kg8 (Ke8 Qe6+ Be7 Qe7#) 21.Qe6+ Kh7 22.Bf6 gxf6 (Kh6 Bd8+ g6 Bxb6) 23.Qf7+ Bg7 24.exf6 Qc7 25.Ng5+ Kh6 26.Qxc7 Bxf6 27.Nf7+ Kg6 28.Nxh8+ Rxh8 Q+2P for N + B B) 18.-Be7 19.Nxf5 Bxg5 20.Qxg5 Kxf7 21.Qxg7+ Ke8 22.Qe7# C) the match 18. Rxf7 Kxf7 19.Nxf5 Kg8 20.Be7 Qc7 21.Looks cmplicated, so 20.Ne7+ Kh7 Looks complicated as well I think, black is helpless (AlWazir) also after D) (ajax) 19.Bd8 Qxd8 20.Nxf5 Ke8 21.Ng5 exf5 22.Qxf5 Qe7 23.e6
Apr-10-21  AlicesKnight: I saw the break-in and was probably expecting 19. ... exf5, not seeing <Brenin>'s 22.Bc1 after the chase in the corner. The picture after White's 31st is fascinating - all steps on the e-file queening road are protected and there is no quick route back for the Black pieces.
Apr-10-21  malt: The rook is trapped, hence 18.R:f7 K:f7
19.N:f5 ef5 20.Q:f5+ Kg8 21.Qe6+ Kh7 22.Bf4
Δ 23.♘g5#
22...g6 23.Qf7+ Bg7 24.Ng5+ Kh6
25.Ne6+ and #

19...Kg8 the best move.

Apr-10-21  RandomVisitor: Stockfish would play 20.Nd6


click for larger view

Stockfish_21033108_x64_modern:

<39/64 04:23 +3.31 20.Nd6> Qc7 21.Nxc4 dxc4 22.Qe4 Qb7 23.Kh2 Rb8 24.Rd1 Qd7 25.Qe2 c3 26.Qc4 Qd5 27.Qxc3 c5 28.Be3 c4 29.Ng5 Rb6 30.Nh3 Bb4

39/61 04:23 +1.69 20.Ne7+ Bxe7 21.Bxe7 Qb2 22.Rc1 Qb7 23.Bc5 Qf7 24.Qxf7+ Kxf7 25.Ng5+ Kg6 26.Nxe6 a5 27.Kh2 Rab8 28.Kh3 Rb2 29.Nf4+ Kh7 30.a4 Nd2

Apr-10-21
Premium Chessgames Member
  chrisowen: Hubs vims Rxf7 gabs ablush vims lunch on a hive rescue guvs hubs muff forked it throb bars brassy i vams rail nail wail airs lain pegs quip covert its dig vims guvs hercules vest vims oz it wily pubs mixed it ova addinups guv ebbs vibe either aids ie dot it was each vims Rxf7 either;
Apr-10-21  mel gibson: I wasn't sure -
I could see the White Rook was doomed.

Stockfish 13 says:

18. Rxf7

(18. Rxf7 (♖c7xf7
♔e8xf7 ♘g3xf5 ♔f7-g8 ♘f5-d6 ♕b6-c7 ♘d6xc4 d5xc4 ♕f4-e4 ♕c7-b7 ♔g1-h2 ♖a8-b8 ♖a1-d1 ♕b7-d7 ♕e4-e2 c4-c3 ♕e2-c4 ♕d7-d5 ♕c4xc3 c6-c5 ♗g5-e3 c5-c4 ♘f3-g5 ♖b8-b7 ♘g5-h3 ♗f8-b4 ♕c3-a1 ♔g8-h7 c2-c3 ♗b4-e7 ♗e3-g5 ♖h8-f8 ♗g5xe7 ♖b7xe7 ♕a1-b1+ ♖f8-f5 ♘h3-f4 ♕d5-b7 ♕b1-c2 g7-g6 ♘f4-h3 ♔h7-g7 ♘h3-g5 ♕b7-c6 ♖d1-b1 ♖f5-f8 f2-f3 ♖e7-e8 ♕c2-e4 ♕c6xe4 f3xe4 ♔g7-g8 ♔h2-g3) +3.02/43 263)

score for White + 3.02 depth 43.

Apr-10-21
Premium Chessgames Member
  agb2002: The trapped rook and uncastled king invite to play 18.Rxf7:

A) 18... Kxf7 19.Nxf5

A.1) 19... exf5 20.Qxf5+ Kg8 (20... Ke8 21.Qe6+ Be7 22.Qxe7#) 21.Qe6+ Kh7 22.Bf4 (threatens 23.Ng5#)

A.1.a) 22... g6 23.Qf7+ Bg7 24.Ng5+ Kh6 25.Ne6+ and 26.Qxg7#.

A.1.b) 22... g5 23.Qf7+ as above.

A.1.c) 22... Be7 23.Qxe7

A.1.c.i) 23... Qb2 24.Ng5+ Kh6 (24... Kg8 25.Qf7#; 24... Kg6 25.Qe6#) 25.Ne6+ Kg6 (25... Kh7 26.Qxg7#) 26.Qxg7+ Kf5 27.Qf7+ Kg4 (27... Ke4 28.Qg6#) 28.Qg6+ Kxh4 29.Bg3#.

A.1.c.ii) 23... Rhe8 24.Ng5+ Kh8 (24... Kh6 25.Ne6+ as above; 24... Kg6 25.Qf7+ Kh6 26.Ne6+ and mate next; 24... Kg8 25.Qf7+ Kh8 26.Qxh5+ Kg8 27.Qh7+ Kf8 28.Qh8+ Ke7 29.Qxg7+ wins decisive material) 25.Qf7 looks similar as the last subline.

A.1.d) 22... Rg8 23.Ng5+ Kh8 24.Qg6 and mate in two.

A.2) 19... Qb2 20.Nd6+ Kg6(8) 21.Qf7+ Kh7 22.Bc1 Qxa1 23.Ng5+ Kh6 24.Qxe6+ g6 25.Nf5#.

A.3) 19... Ke8 20.Ne3, unclear.

B) 18... Nxg3 19.fxg3, with the idea Rf1-Ne1 and Rxf8+ or Rxg7-Qf7#, looks good for White.

C) 18... Qb2 19.Rf1 may be similar to previous lines.

Apr-10-21
Premium Chessgames Member
  chrisowen: Liquid as words and you know jesus as f7 you seeking it is on can't be bad only hope?
Apr-10-21
Premium Chessgames Member
  drollere: if you can't protect a piece, find a useful way to burn it. therefore, Rxf7.

after Kxf7 the N is pinned, and declining the recapture after Nxf5 (exf5, Qxf5+ Kg8) forestalls the likely make with B, N and Q that would follow.

after that i lost the thread in the variations.

Apr-10-21  TheaN: Not terribly difficult to see the concept, <18.Rxf7 Kxf7 19.Nxf5> looks painful, with the point 19....exf5 20.Qxf5+ Kg8 (Ke8 21.Qe6+ #1) 21.Qe6+ Kh7 and now moving the bishop anywhere to free g5 so Black has to surrender Bf8; Bc1 is best. Even the forcing Bd8 works as after 22.Bd8 Qxd8 is the only real solve to 23.Ng5+ Qxg5 24.hxg5 +- and despite material's on Black's side it's completely immobilized.

The alternatives I didn't really look at, as after 22.Nxf5 an exchange for passed pawn is awesome in a position like this; Black's rooks are bystanders.

Apr-10-21
Premium Chessgames Member
  perfidious: At the very least, the outlines of the puzzle as presented must be foreseen well before White's 18th, otherwise that rook on the seventh is in a world of hurt.
Apr-11-21  njchess: I agree, 18.♖xf7 ♔xf7 19.♘xf5 ♔g8 was pretty obvious, and not just because White is going to lose his rook, but also because Black's pieces are so unconnected and uncoordinated. Objectively, besides capturing White's rook, the only other real threat from Black is ♕b2.

As far as White's 20th move, the choice between ♘e7+ or ♘d6 would be a difficult one. I think the tendency for chess players to simplify through forcing moves to justify a sacrifice probably dictated 20. ♘e7+ over ♘d6. In the end, White is playing for a passed pawn, and he might not have thought that ♘d6 would produce that result.

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