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Viacheslav Ragozin vs Igor Bondarevsky
Match for the GM title (1946), Moscow URS, rd 7
English Opening: Anglo-Indian Defense. Queen's Indian Formation (A15)  ·  1-0
ANALYSIS [x]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 1 OF 4 ·  Later Kibitzing>
May-04-04
Premium Chessgames Member
  meloncio: Watching beatiful games like this one, to win in chess seems so easy ..., and it's not true!

Botvinnik points out just one black's mistake: 18. ... ♘c5? (much better 18. ... g5, he says).

Jul-02-09  abstraction: Everyone is going to be saying it , so I might as well get it started: 'much easier than yesterday', 'more like a monday puzzle', etc. Still, concise and devastating finish.
Jul-02-09  EXIDE: I thought 28.Pd6 wins material. Did not see the forced win with QxR.
Jul-02-09  310metaltrader: i think pd6 is better.
Jul-02-09  Kasputin: Spotted the combination starting with the queen sac because of the possible double check in the position. When I saw black had no real answer to 30. d6 then I was confident that I had found the solution.
Jul-02-09
Premium Chessgames Member
  dzechiel: White to play (28?). Material even. "Medium."

I got this one immediately. With all the white pieces bearing down on the black king, an assault on the monarch seemed necessary.

28 Qxa7+ Kxa7 29 Rxb7+ Ka8 30 d6

The threat of the discovered check is a killer. Black can't even try

30...c6

because

31 Rxd7

just snags the queen.

I'm sure this is it. Time to check.

Jul-02-09  CHESSTTCAMPS: White has a dominating position because of the pin on b7 and all pieces optimally placed. 28.Qc6 Qxc6 29.dxc6 wins a piece, but even stronger is 28.Qxa7+! Kxa7 29.Rxb7+ Ka8 30.d6 and now:

A.30... Qa4/g4 31.Rb8+ Ka7 32.R3b7#
B.30... a5 31.Rxc7+ Qc6 32.Bxc6#
C.30... c6 31.Rxd7 with a quick mate to follow.

Jul-02-09
Premium Chessgames Member
  dzechiel: <310metaltrader> and <EXIDE>

28 d6 is met with 28...c6, and now the queen helps to protect b7.

Ragozin's move order is correct.

Jul-02-09  KnightFortress: <dzechiel> I think Bxc6 wins after 28...c6, but I agree that Ragozin's move order is better though.
Jul-02-09
Premium Chessgames Member
  johnlspouge: Thursday (Medium):

Ragozin vs Bondarevsky, 1946 ( 28.?)

White to play and win.

Material: Even. The Black Kb8 has 2 legal moves, both on the back rank. The White battery Rb3 and Rb4 pins Bb7 to Kb8. The White Qc5 attacks Ra7, which defends Bb7. Only the Black Kb8 defends Ra7, suggesting a combination based on decoy or removal of a defender. The White Be4 lurks behind Pd5, so Pd5 can discover another attack on b7. The White Kc1 is secured from check.

Candidates (28.): Qxa7+

28.Qxa7+ Kxa7 [Kc8 29.Qa8+ Bxa8 30.Rb8#]

29.Rxb7+ Ka8 30.d6 (threatening 31.Rb8++ Ka7 32.R3b7#)

(1) The only defense against the double check is to interpose between Ka8 and Be4:

30c6 [Qc6+ 31.Bxc6 is unproductive] 31.Rxd7

White wins B+R and retains crushing threats.

(2) The only defense against the follow-up 32.R3b7 Is to interpose or capture on b7:

30Qb5 31.R7xb5++ Ka7 [c6 32.Bxc6+ Ka7]

32.Rb7+ Ka8 33.Rb8++ Ka7 34.R3b7#

(3) 30Qc8 31.Rxc7+ Qb7 32.Rxb7

Black now faces the same mate without his Q.

(4) Black can also try to create luft:

30a5 31.Rb8++ Ka7 32.R3b7+ Ka6 33.Bd3+ Qb5 34.Bxb5#

Jul-02-09  akapovsky: 1.d6 does in fact win
Jul-02-09  FabrikaLaHun: <abstraction> is right. I sucked this week and am very tired now. As a diversion just before bed, I logged in to see the puzzle (not expecting much since it is Thursday). Trying to break through at b7 went nowhere and the bishop can't do much so it left the Qa7 as in the text. Saw all the follow up through d6 and knew it was winning so stopped there.

Maybe <MAJ> will run this through his algorithm as he has this week and tell us its level of difficulty.

Jul-02-09
Premium Chessgames Member
  mike1: 28. d6 runs into the simple cxd6!
29.Rxb7 does not work now ...Rxb7
30.Rxb7 Qxb7
31. Qxd6 Qc7

Qxa7 is the only solution

Jul-02-09  akapovsky: 1.d6 cxd6
2.Qxa7+!! NOW IT WINS
Jul-02-09  remolino: Was this not easier than yesterday? Smyslov is too clever. This one is much too obvious:

28. Qxa7 Kxa7, 29.Rxb7 Ka8, 30. d6

and the game is as good as over.

Time to check.

Jul-02-09  zooter: 28.Qxa7+ Kxa7 29.Rxb7+ Ka8 and now 30.d6 sets up a deadly mating net that black cannot avoid...

Time to check

Jul-02-09  Anatoly21: Yesterday was certainly more difficult. This combination is pretty much forced and the only possible difficulty in solving it is forming the move order.
Jul-02-09
Premium Chessgames Member
  sfm: No caveman with a club would have any excuse for not finding this.
Jul-02-09
Premium Chessgames Member
  Morten: Got this quickly. But white's position is so good there must be a number of winning lines.
Jul-02-09  MostlyAverageJoe: <FabrikaLaHun: ... Maybe <MAJ> will run this through his algorithm as he has this week and tell us its level of difficulty.>

Just as many others, personally I found it easy.

My silicon monster evaluates it in easy Wednesday range (to find the best move). But this is perhaps because there are many other winning lines, not requiring a Q sac. Wasting a move with Kb1/Kb2 still wins.

Requiring to show that it is a forced mate in 8 would bring it to Thursday difficulty.

Here's the mainline:
1. +M8 28.Qxa7+ Kxa7 29.Rxb7+ Ka8 30.d6 c6 31.Rxd7 Rc8 32.Rc7 Rxc7 33.dxc7 a5 34.c8(Q)+ Ka7 35.Qb7#

and the next 19 choiced for a wining move:-)

2. (+9.33) 28.d6 c6 29.Bxc6 Rc8
3. (+7.31) 28.Qc6 Qxc6+ 29.dxc6
4. (+6.86) 28.Kb1 Qd6 29.Qc6 Kc8
5. (+6.76) 28.Kb2 Qd6 29.Qc6 Kc8
6. (+6.75) 28.f3 Qd6 29.Qc6 Kc8
7. (+6.70) 28.Bg2 Qd6 29.Qc6 Qxc6+
8. (+6.52) 28.g4 Qd6 29.Qc6 Kc8
9. (+6.50) 28.Bf3 Qd6 29.Qc6 Qxc6+
10. (+6.44) 28.f4 Qd6 29.Qc6 Qxc6+
11. (+6.33) 28.h3 Qd6 29.Qc6 Kc8
12. (+6.18) 28.h4 Qd6 29.Qc6 Kc8
13. (+6.02) 28.Kd1 Ka8 29.Rxb7 Rxb7
14. (+5.70) 28.Kd2 Rd8 29.Ke1 c6
15. (+5.28) 28.Kc2 Qc8 29.Qc6 Rh7
16. (+5.11) 28.Bh1 Qc8 29.Qc6 Rh7
17. (+3.94) 28.Rb2 Qc8 29.Kb1 a5
18. (+3.64) 28.a3 Qc8 29.Qc6 Ka8
19. (+3.61) 28.a4 Qc8 29.Qc6 Ka8
20. (+3.49) 28.Rb1 Qc8 29.Qc6 a5

Jul-02-09  akapovsky: So 1.d6 does win:)
Jul-02-09  MostlyAverageJoe: For those disappointed with the easy puzzle today, a Thu/Fri-level puzzle can be found here: Gligoric vs Smyslov, 1959

The puzzle is a part of the refutation of <38. Ng3> as the alleged saving move in the game that was the subject of the yesterday's puzzle.

Jul-02-09
Premium Chessgames Member
  gofer: Much easier than the last two days! The only question is when to play d6, forcing black to reply with c6...

28 Qxa7+ (probably black resigns at this point)
28 ... Kxa7 (forced)
29 Rxb7+ Ka8
30 d6!

Now black has no good reply...

30 ... c6 31 Rxd7 mating
30 ... Qxd6 31 Rxc7 mating
30 ... Rc8 31 Rxc7 mating
30 ... Qb5 31 R7cxb5 mating

Time to check...

Jul-02-09
Premium Chessgames Member
  agb2002: Material is even. White only needs to destroy the
28.Qxa7+ Kxa7 (28... Rc8 29.Qa8+ Bxa8 30.Rb8#) 29.Rxb7+ Ka8 30.d6:

A) 30... c6 (or 30... cxd6) 31.Rxd7 + -.
B) 30... a5 31.Rxc7+ + -.
C) 30... Qc8 31.Rxc7+ + -.
D) 30... Qc6+ 31.Bxc6 + -.
E) 30... Qb5 31.R7xb5+ + -.
F) 30... <any other move, say, Qxd6> 31.Rb8+ Ka7 32.R1b7#.

28.Qc6 also wins:

A) 28... Kc8 29.Rxb7 + -.
B) 28... Qxc6 29.dxc6 + -.
C) 28... Qc8 29.d6 cxd6 30.Rxb7+ Rxb7 (30... Ka8 31.Rb8#) 31.Rxb7+ Ka8 32.Rc7+ Rb8 33.Qb6+ Qb7 34.Qxb7#.

Jul-02-09  Fezzik: I too found this to be *much* easier than yesterday's puzzle even though it involved more moves.

This is because every move is forcing, and almost all are checks. (The last isn't a check, but absolutely devastating.)

So, I would have reversed the order of the puzzles. After all, this is still a pretty combo.

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