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Alexander Grischuk vs Boris Grachev
Russian Team Championships (2017), Sochi RUS, rd 4, May-05
Sicilian Defense: Paulsen Variation (B46)  ·  1-0
ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
May-08-17  JimNorCal: Well, as I write this there are more games to come. Also, I haven't seen all the games which have already been played.

Having said that, I was startled and excited to see White's 34th move in this game. It hard to imagine another game topping this one!

May-09-17  Mudphudder: What an amazing find. That Rb5 was like a computeresque! Grischuk playing with silicon finesse.
May-10-17  NBZ: Yeah how the game turned on Rb5!!

PS: This is what double exclamation marks were invented for.

May-10-17  Ulhumbrus: After 19...b5 20 ab Rxb6 Black's a and c pawns turn out to be weaker than White's a and c pawns
May-10-17  NBZ: <Ulhumbrus>: One other interesting thing about that position. This sequence (...b5 axb Rxb6) happens a lot in the Benoni, but there white has a pawn on b2 which Black can target. Here White actually benefits from having doubled pawns on the c-file, since there is nothing for black to hit on the b-file.
May-10-17  siggemannen: A move for Krabbe's "best" chess moves collection
May-19-17  Walter Glattke: 42.-Qxf5 43.Rg6+ Kh5 42.Qxf5+ Kh4 43.Qg4#
34.-R1xb5 35.cxb5 Qb6 36.Rb1 a5 37.e5
May-19-17
Premium Chessgames Member
  al wazir: I realized that the key move had to be 34. Rb5 (what else could it be?), but I couldn't see the continuation. After 34...R8xb5 35. cxb5 Rxb5 36. Bxb5 axb5 it's a completely different game. White is up only an exchange to a ♙ and the win isn't clear.
May-19-17
Premium Chessgames Member
  patzer2: For today's Friday puzzle (34. ?) I couldn't resist the obstruction <34. Rb5!> simply because it looked cool and fun.

I visualized as far as 34. Rb5! Rxa1 35. Rxb8, and after the computer best move and game reply 35...Kf7 I went with the immediate 36. e5 to (diagram below)


click for larger view

This move (36. e5) gets a favorable computer evaluation (+2.53 @ 35 depth, Stockfish 8.) However, after 36...Re1 it's an extremely tough nut for White to crack.

Indeed, after Stockfish 8's long 35 depth analysis (+2.53 @ 35 depth) 36.e5 Re1 37.exf6 gxf6 38.Bxh7 Ke7 39.Bg6 Re5 40.Kg1 Qd6 41.Rb1 Rg5 42.Qe4+ Be6 43.c3 f5 44.Qa8 Rxg6 45.hxg6 Qd3 46.Rf1 Qe3+ 47.Kh2 Qh6+ 48.Kg3 Qxg6+ 49.Kf2 Qg5 50.Qa7+ Ke8 51.Re1 Qd2+ 52.Kf1 Qd6 53.Kg1 Kd8 54.Qh7 Kc8 55.Rb1 Qe5 56.Qh6 Qd6 57.Qh8+ Kd7 58.Qg7+ Kd8 59.Qh7 Qg3 60.Qh8+ Kd7 61.Rd1+ Ke7 62.Qh7+ Ke8 63.Qh6 Ke7 64.Rb1 Kd7 65.Qf8 Qd6 66.Qa8 Ke7 67.Rb7+ Bd7 68.Qh8,


click for larger view

I force the program to look one half move deeper and it reveals Black has a forced draw by perpetual after 68...Qd1+ 69. Kh2 Qd6+ 70. Kg1 = (0.00 @ 30 depth, Stockfish 8.)

The difference between my try 36. e5 and Grischuk's much stronger follow-up move <36. Qg3!> is that it prevents any counter play by Black with 36...Re1, and allows White to play 38. e5 in a couple of moves with much more decisive effect.

Surely that's why the computer rates 36. Qg3! Qd7 37. h6 g6 38. e5! (+3.77 @ 31 depth, Stockfish 8) as by far White's strongest choice.

P.S.: Black's decisive mistake is attempting to trade down with <33...Rb1?> which allows White to play the strong winning obstruction move <34. Rb5! .>

Instead, 33...h6 = to (+0.25 @ 31 depth, Stockfish 8) keeps the tension in the position and allows Black to stay in the fight.

May-19-17
Premium Chessgames Member
  ChessHigherCat: Interesting variant on the interference theme. The key is that white's Q is threatening the R on b8, which is only protected by the rook on b1. 34. Rb5 and now black can capture with either R (but not with the pawn, which would allow Qxb8. If 34... R1xb5, then 35 cxb5 and the only alternatives for the black Q are b7 or b6, since she has to defend the rook. If b7, then 36 bxa3 attacking the Q, Q moves and 37. b7 with a steamroller pawn advance. If 35...Qb6, then Rxb1

If 34. Rb5 R8xb5, then 35. cxb5 and black has to lose the exchange with Rxb5 (if not, Rxb1 loses the R outright).

Well, now that I've looked at the continuation, I see I've overlooked 35...bxa1, which still requires a lot of tricky maneuvering in order for white to win.

May-19-17
Premium Chessgames Member
  gofer: The first move was obvious. The reply was also as its the only choice for black that doesn't lose an exchange (or worse).

<34 Rb5! Rxa1>
<35 Rxb8 ...>


click for larger view

The rest was completely lost one me, I didn't know what black would do to defend or white to continue the attack. As <Patzer2> points out <36 Qg3> separates the men from the boys. I was no where near really...

May-19-17  Iwer Sonsch: I don't see anything.

Going for 34.Rxb1 Rxb1 35.e5 fxe5 36.Qxe5. Not a sacrifice at all, is it?

May-19-17  Walter Glattke: I agree, e5 opens lines for the bishop,
and brings Qe5;
the rook change must be done, before e5 then brings advantage. One can test this in several variations.
May-19-17  Iwer Sonsch: Even though <36.Qg3! Qd7 37.h6 g6 38.e5> is indeed winning the hardest, it is also the most difficult way to win. Every single move in the sequence of <38.e5 Qd4 39.Rxc8 Qg1+ 40.Kh3 Re1 41.Rc7+ Kf8 42.Rxh7 Re3 43.Rh8+ Ke7 44.exf6+ Kd7 45.Rh7+ Kd8 46.Qxe3! Qxe3+ 47.Kg4> has to perfectly fit in order to avoid a draw.
May-19-17
Premium Chessgames Member
  kdogphs: First try! I've noticed the interference theme throughout this week's puzzles and figured that Rb5 was correct, and it was!
May-19-17
Premium Chessgames Member
  agb2002: The material is identical.

The black rooks are threatened but connected. This suggests 34.Rb5:

A) 34... axb5 35.Rxb1

A.1) 35... Ra8(b6,b7) 36.cxb5 wins a pawn (passed and protected).

A.2) 35... bxc4 36.Rxb8 cxd3 37.cxd3 + - [R vs b].

B) 34... R1xb5 35.cxb5

B.1) 35... Qb6(7) 36.bxa6 is similar to A.1.

B.2) 35... Rxb5 36.Bxb5 + - [R vs b+p] followed by the invasion of Black's field with the heavy pieces.

B.3) 35... axb5 36.Qxb8 wins.

C) 34... R8xb5 35.cxb5 Rxb5 (35... Rxa1 36.bxc6 wins) 36.Bxb5 as above.

D) 34... Rh1+ 35.Kxh1 axb5 36.Qxb8 wins.

May-19-17
Premium Chessgames Member
  agb2002: Wish I received a cent for every reply to the initial move I forget.
May-19-17  Walter Glattke: What says the computer to 37.-Qg4!? in the match continuation!? Must be better than 37.-fxe5.
May-19-17
Premium Chessgames Member
  chrisowen: Rove b5s builds vim rink u a1s amp b8s bullshine lunks o f7s flunghid bud ebber 35Re1 focus eyes down 1 build vim g3s gung hos lunkus 36.e5 adds eggers fat chance build vim lunks o d7s diligent vote bug arable 36Ra3 fad hand end ohs acts 1 build vim lunk e5s ebbers lunk e5s eggers bud gunghos 37Qg4 fbi eel egg guild 1 build vim lunks o h7s harangue bud g4s guild vim harangue 38Rh1+ flush did ego hud 3 build vim lunks g6s guffaws lunks f6s fluidin vides b6s buffins lunk g5s guilds bunk e5s ebbers lunk f5s fluids vide it to 42.Bxf5 plush finish 5 build vim vet tint it to 42.Qe7+ plushy eggshead 10s 11s build vim vet voice mr's rink ream vim aeon marquis gunghos whippy put tub but fence bent jink jovial clued it's alive hob pawn vim it's alive happy von bone pew it's alive hob pane win a bop hewn hive bah pen when b5s builds vim ore vet romp ever rove mr's voice vim rink vocal ram vote marquis guests grew whippy pay put vent tub but buff flubb fence bent enter jenga blocks build vim any joy jink vide clued it's alive vast area mouth man been 34.Rb5 Rxa1 35.Rxb8 Kf7 ebber you miff muff vint flick film flimsy cuff b5s builds vim von guv i beef feeble been build benign but ebber 35 35Re1 focus eyes down 1 build vim garcon 36.Qg3 add gack vim ebbers 36.e5 adds eggers fat chance build vim dangle 36Qd7 fab ever diligent vim arrive 36Ra3 fad hand end ohs acts 1 build vim entropy 37.e5 fxe5 eyes ebbers vim gunghos 37Qg4 fbi eel egg guild vim harangue 38Rh1+ flush did ego hud 3 build vim gargoyles 39.Bg6+ offer guffaws bud finishman 39Kf6 40.Rb6+ point buffets around von guv vim dont 40...Kg5 41.Qxe5+ paid eggers vide bung offs u 41Bf5 42.Bxf5 plush finish 5 build vim bunk it to 42.Qe7+ plushy eggshead 10s 11s build vim vet bag baggy rates and gab bug biggy glib buggy aids winch vide fig pins winch doctrinated it's alive then fancy aids fairy affable affect aids and fairly won hmms bit oks von guv huff flush huh cub club hud hid vide crib vim ruddy rids ums hand bag iffy flav face fend ream b5s a brucie bonus.
May-19-17  Walter Glattke: 36.Qg3 Qe6 37.e5 Qxe5 38.Bxh7?? Rh1+
Maybe draw with Qe6 instead of Qd7.
May-19-17  Walter Glattke: 37.-Bd7
May-19-17
Premium Chessgames Member
  patzer2: I was curious to see what the best Stockfish 8 line was for White after <34. Rb5!> 34...axb5, so I played it out to at least 30 depth per move with the following result:

Following <34. Rb5!>, if 34...axb5 White wins after 35.Rxb1 Rb7 36.cxb5 Qe6

( 36...Qb6 37.e5 Re7 38.Bc4+ Be6 39.exf6 gxf6 40.Re1 Kf7 41.Bxe6+ Rxe6 42.Qc4 Qd6+ 43.Kh1 h6 44.Rxe6 Qxe6 45.Qxe6+ Kxe6 46.b6 Kd7 47.Kh2 c4 48.Kg3 Kc6 49.b7 Kxb7 50.Kf4 Kc7 51.c3 Kd7 52.Kf5 Ke7 53.Kg6 f5 54.Kxf5 Kf7 55.g4 Kg7 56.Ke6 Kh7 57.Kf6 Kh8 58.Kg6 Kg8 59.Kxh6 Kh8 60.g5 Kg8 61.g6 Kh8 62.Kg5 Kg8 63.Kf6 Kf8 64.g7+ Kg8 65.h6 Kh7 66.Kf7 Kxh6 67.g8=Q Kh5 68.Qg3 Kh6 69.Qg6#)

37.Ra1 g5 38.hxg6 hxg6 39.Kg1 c4 40.Ra6 g5 41.Qh2 Qe7

(41...Qf7 42.Bf1 Qc7 43.Qxc7 Rxc7 44.Ra8 Kf7 45.b6 Rc6 46.Ra7+ Ke6 47.b7 Bxb7 48.Rxb7 Ke5 49.Rb4 c3 50.Kf2 Ke6 51.Rc4 Rd6 52.Rxc3 Rd2+ 53.Kg3 Rd1 54.Rc6+ Ke7 55.Bd3 (+7.27 @ 35 depth, Stockfish 8)

42.Bxc4+ Kg7 43.Qd6 Rc7 44.Qxe7+ Rxe7 45.Ra8 Rc7 46.Bb3 Kg6 47.b6 Rc6 48.Rb8 Kh5 49.b7 Bxb7 50.Rxb7 Kg4 51.Re7 Kf4 52.Kf2 Rc3 53.Re6 g4 54.Rxf6+ Kxe4 55.g3 Rc8 56.Rf4+ Ke5 57.Rxg4 Rc3 58.Rc4 Rxc4 59.Bxc4 (Mate in 14, Stockfish 8 @ 52 depth}

May-19-17
Premium Chessgames Member
  swclark25: got the first two moves as well, but agreed with <gofer> that the rest was lost on me.
May-19-17  Moszkowski012273: 19...Bxc4 is interesting.
May-19-17
Premium Chessgames Member
  bubuli55: I did not even consider Rb5. That's insane.
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