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Peter Vasilievich Dubinin vs Gavriil Veresov
USSR Championship (1940), Moscow URS, rd 16, Sep-26
Sicilian Defense: Richter-Rauzer. Classical Variation (B65)  ·  0-1

ANALYSIS [x]

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Kibitzer's Corner
Sep-23-18  Delboy: The bishop sac 34. ... Bxg2+ followed by 35. ... f3 is both aesthetically pleasing and deadly. Note that 37. Kg1 f2# is mate. Alternatives also lose for white, e.g. 36. Qd5+ Kh8 37. Qd2 fxg2++ 38. Kg1 Rf1+ 39. Rxf1 gxf1=Q+ 40. Kxf1 Qf3+ followed by 41. ... Ra1+
Jan-13-22  Honey Blend: 34. ♕c4+ ♔h8 35. ♕e2 would have been the better defense for White to avoid the attack that happened in the text.
Jan-13-22  Brenin: 34 ...Bxg2+ 35 Kxg2 f3 36 Bh1 Qh3+ (not 36 ... f2 37 Qg2 or Bg2) 37 Kf2 (otherwise 37 ... f2+ follows) Qh2+ 38 Ke3 Qe2+ 39 Kd4 Rfd8+ 40 Kc5 Qxe4, with Q for B and mate to follow soon.
Jan-13-22  Refused: 1...Bxg2 2.Bxg2 f3 is the first only thing that comes to mind.

a)3.Bxf3 Rxf3+ ends the game immediately

b) 3.Bh3 Qxh3+ once again the endis near

c) 3.Bh1 Qh3+ 4.Kf2 Qh2+ (4.Kg1 f2# 4.Ke1 f2+ curtains) 5.Kf1 Qxh1+ 6.Kf2 Qh2+ 7.Ke3 Qe2+ 8.Kd4 Rd8+

I am somewhat missing the instant kill after the outright rejection of the Bishop. 1...Bxg2+ 2.Ke2

Jan-13-22  Brenin: After allowing his K's defensive wall to be breached with 13 ... Bxc3 14 bxc3, White's 16 Qxb5 was unwise, exposing both K and Q to attack; 16 Bxb5 would have been safer. It is then instructive how Black manages to avoid Q exchanges and to open lines for his pieces.
Jan-13-22  Honey Blend: I think White can also get away with 36. ♖xg7+ ♕xg7 37. ♗h3


click for larger view

He will be an exchange down and the position is quite ugly, but the fight will be far from over.

Jan-13-22  Brenin: <Refused>: After 34 ... Bxg2+ 35 Ke2 I think that 35 ... Ra5, or possibly 35 ... Bxf3+ 36 Qxf3 Ra5, wins for Black, though nothing like as clearly as in the game line.
Jan-13-22  Brenin: <Honey Blend>: After 34 ... Bxg2+ 35 Bxg2 f3 36 Rxg7+ Qxg7 37 Bh3 Ra5, I don't think White can last long, e.g. 38 Rd5 Ra1+, or 38 e6 Rg5 39 Qe3 f2.
Jan-13-22  mel gibson: A tricky puzzle.
I saw the correct move but I was unsure if it was wise or not.

Stockfish 14 says:

34... Bxg2+

(34. .. Bxg2+ (♗h3xg2+ ♗f3xg2 f4-f3
♖b7xg7+ ♕g3xg7 ♗g2-h3 ♖a8-a5 ♔f1-f2 ♖a5xe5 ♕e4-g4 ♖e5-e2+ ♔f2-g3 f3-f2 ♕g4xg7+ ♔g8xg7 ♖d1-f1 ♖e2-e5 ♔g3-g2 ♖e5-g5+ ♔g2-h2 ♖f8-f4 c3-c4 ♔g7-f6 c2-c3 ♔f6-g7 c4-c5 ♖g5xc5 ♔h2-g3 ♖f4-f7 ♗h3-e6 ♖c5-g5+ ♔g3-h2 ♖f7-f4 ♗e6-h3 ♔g7-h7 c3-c4 ♔h7-g7 ♖f1-b1 ♖f4-f3 ♗h3-f1 ♖g5-g1 ♖b1-a1 ♖f3-f5 ♖a1-a7+ ♔g7-f6 ♖a7-a6+ ♔f6-g5) +6.87/37 412

score for Black +6.87 depth 37

Jan-13-22  EasilyConfused: I think 35 Ke2 is a better move for White than the game line. 35.. Bxf3+ is OK but I think White can survive with precise play.
Jan-13-22  mel gibson: Stockfish 14.1 avx2 says:

34... Bxg2+

(34. .. Bxg2+ (♗h3xg2+ ♗f3xg2 f4-f3
♖b7xg7+ ♕g3xg7 ♗g2-h3 ♖a8-a5 ♗h3-e6+ ♔g8-h8 ♕e4-g4 ♖a5xe5 ♕g4xg7+ ♔h8xg7 ♗e6-g4 h6-h5 ♖d1-d7+ ♔g7-g6 ♖d7-d6+ ♔g6-g5) +7.01/53 424)

score for Black 7.01 depth 53.

Jan-13-22  Refused: Brenin yes black is better in all lines. That is out of the question. Like I said, I just don't see the instant kill(s) like in the game line.

Black can keep on pushing with Ra5 and the full point should drop eventually - personally, I wouldn't exchange pieces on f3, if I can avoid it as it feels like exchanges make white's defensive task some easier. With the exposed king I'd prefer keep attackers on the board.

Jan-13-22  AlicesKnight: I saw the ... Bxg2+ and ... f3 game line, but, like others (as I see now), thought White could do better not taking - Black remains better but not yet conclusive. Moving the B from the h3-d7 diagonal has perils for Black if checking slows down (Rxg7+ and Rd7+).
Jan-13-22
Premium Chessgames Member
  agb2002: Black is one pawn down.

The white bishop holds the position. This suggests 34... Bxg2+:

A) 35.Bxg2 f3

A.1) 36.Rxg7+ Qxg7

A.1.a) 37.Bxf3 Rxf3+ 38.Qxf3 Rf8 wins.

A.1.b) 37.Bh3 Ra5 (37... Rae8 38.e6 with some resistance) 38.e6 (38.Rd5 Ra1+ 39.Kf2 Qg8#) 38... Rg5 must be winning.

A.2) 36.Bxf3 Rxf3+ wins.

A.3) 36.Bh1 Qh3+

A.3.a) 37.Ke1 Qxh1+ 38.Kd2 Rad8+ wins.

A.3.b) 37.Kf2 Qh2+ 38.Ke3 Qe2+ 39.Kd4 Rad8+ wins decisive material.

A.3.c) 37.Kg1 f2#.

A.4) 36.Rd2 Ra1+ wins.

B) 35.Ke2 Bxf3+ 36.Qxf3 Qh2+

B.1) 37.Qf2 f3+ 38.Kf1 (38.Ke1(3) Qxe5+) 38... Qxe5 looks very good for Black (39.Rdd7 Ra1+ and mate in two).

B.2) 37.Ke1 Qxc2 and Black has won a pawn and looks better.

B.3) 37.Kd3 Rfd8+ is surely too risky for White.

Jan-13-22  Viennablue: I looked into 34…Ra4. In case of 35. Qxa4 White gets mated (starting with 35…Qxf3+ etc). Unfortunately White can refuse this Rook sacrifice leading to a level game…
Jan-13-22
Premium Chessgames Member
  Teyss: As <Refused>, I didn't see anything convincing after 35.Ke2 although Black has a winning position.
Interesting 36.Rxg7+ line provided by <Honey Blend> which I didn't consider: again Black is winning but not an immediate kill.
Jan-13-22  TheaN: I get the Thursday label, but CG is missing a rather tricky variation here.

<34....Bxg2+> is free, as 35.Bxg2 f3 seems suicidal for White and it is. I had actually missed 36.Bh1 but it's obvious f3 will decide by taking away critical flight squares, 36....Qh3+ 37.Kf2 (Kg1 f2#; Ke1 Qxh1+) Qh2+ -+ and the White king's forced into the line of fire of the rooks.

However, <35.Ke2> and Black has just won the pawn back he lost earlier. Black's winning but it's far from satisfying. I seriously considered exchanging twice on f3 but that seems hard to win (-0.48). I seriously looked at <35....Ra5 -+>, which is best apparently, to keep the White queen at bay and pressuring the position, yet there are moves like 36.Qc4+ to consider.

Not that 'medium', the combination in full is, the variation approaches Saturday.

Jan-13-22
Premium Chessgames Member
  Dionysius1: <TheaN... However, <35.Ke2> and Black has just won the pawn back he lost earlier. Black's winning but it's far from satisfying>.

Well, yes and no. Thomas the Tank (Engine)'s analysis implies bring the rooks into play, don't exchange bishops, and the open files and the initiative will be enough for a cast iron win.

I agree it's not as satisfying as the line white allowed Black to play, but I'd be grinning if I was playing as Black.

Jan-13-22  Whitehat1963: Saw the first few moves, but I did not expect 36. Bh1.
Jan-13-22
Premium Chessgames Member
  chrisowen: Quake its v o Bxg2+ ghoul afford pad its bubbled its v box i quake its v o cajole v its shamrock hrm row its dabble its vint trick quick pig u golly its c jaf its v i sow its hun liv its melt road jazz its blink very yop paved it gave it eel jar gabs its gib gungho v its bob it scuba food its v aight i asks gotcha its v icicle ghost afford joffrey awooga jo u c finger it he ger plang a cuff its v muff no be ludagte v its ah its bugs v its bind x i a doff no off its v ie it ogle its v i a huff v its roof ha jitterbug bubble have its ban c cuff its v buck eels v its wig lag catch boot it vote an honour jah again i gack q abc claw its bounced it v i fended it v ban it wc u clan cobs bravo nor decks its grief its v cali lard it verdi fa its v gg canine be its v i fudge it her bind its v a charybdis it vid c i feed it v flight it is v i jack con c ted it v i pet it bet creed it cabs v it bale it file it v eg hid its v cj hook dab c v it bub c it v its ben c it v dr drift fought cred it soften v it vigilant its doc its bubble its v i cog talc ant with it rep etc none v it vase line it i vichy it val it v ichi visit ale i bud inn I rig it val no oliver creed it c ol v o g2 net it serve it v ant no love it viva rig Bxg2+ out it ear;
Jan-13-22
Premium Chessgames Member
  benveniste: I saw the first two moves. I didn't see 36. ♖xg7+. Black ends up the exchange for a pawn, but with so many major pieces in an open position it's still going to be a fight.
Jan-13-22  Elbajacisback: I went for the flashy 34..Ra4 and black should win if the queen takes the rook, playing 35..Qxf3 etc. But what is the best play if the rook sac is refused?
Jan-14-22  Brenin: <TheaN>: After 34 ... Bxg2+ 35 Ke2 Ra5 36 Qc4+ Kh8 White has the B and the e-pawn both en prise (with check), and cannot avoid mate soon.

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