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Evgeny Tomashevsky vs Wesley So
World Cup (2013), Tromso NOR, rd 2, Aug-14
Gruenfeld Defense: Russian. Prins Variation (D97)  ·  1-0



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Premium Chessgames Member
  Penguincw: This puzzle seems simpler than it actually is. :|
Apr-13-14  patzer2: Even more difficult than today's Sunday puzzle position (48. ?, White to move) is Black's preceding move (47...?, Black to move):

Evgeny Tomashevsky - Wesley So, World Cup Tromso NOR 2013

click for larger view

Here 47...Kf8! (instead of 47...Ke6? 48. f5+! ) gives Black excellent practical chances of holding the draw.

Analysis by Fritz 12 (@25/50 depth, dual core processor, 2.1 GHZ):

1. (0.74): 47...Kf8 48.Rxd3 Nxd3 49.h5 g5 50.fxg5 Nxe5 51.Be4 Nf7 52.Bxh7 Nxg5 53.Bf5 Kg7 54.Nf4 Rb4 55.Kg4 Kh6 56.g3

P.S.: No doubt 47...Ke6?, "blocking the passed pawn" is the most natural and instinctive move.

Aron Nimzowitsch's advice on blocking passed pawns at every opportunity is an excellent rule of thumb: "A passed pawn is a criminal which should be kept under lock and key. Mild measures, such as police surveillance, are not sufficient."

Unfortunately for Black 47...Ke6?, allowing 48. f5+!, is an exception to the rule as mild-measured surveillance with 47...Kf8! is exactly what is called for in this position.

Apr-13-14  tatuviejo: ? "Chessgames" does not accept comments in Spanish? ... Well, I'll have to take a course in English language.
Premium Chessgames Member
  LucB: <The potential passed pawn is a 'Candidate-Passer.'>

Now you're being silly, Sally!

Apr-13-14  patzer2: Like most Sunday puzzles, 48. f5+! combines a number of tactical themes:

1. Clearance and knight fork are evident in the blunder possibility 48...gxf5?? 49. Nf4+ .

2. Decoy and mate threat are demonstrated by the other blunder possibility 48...Kxf5?? 49. Bg4#.

3. Deflection, passed pawn and in-between (a.k.a. zwischenzug) themes show up in the final sequence 48...Kd7 49. e5+ Kd6 50. Re1! (the zwischenzug) 50...Rb8 51. e7! .

In the final position, Black is helpless against the advance of the passed e and f pawns.

For example, after 51. e7! play might continue 51...Rxd5

(51... gxf5 52. e8=Q Rxe8 53.
Rxe8 )

(51... Re8 52. f6 Ne6 53. f7 Rxe7 54. Rxe6+! Kxe6 55. f8=Q )

52. Bxd5 Kxd5 53. f6 Ne6 54. f7 Ng7 55. f8=Q .

Premium Chessgames Member
  thegoodanarchist: <offramp: <al wazir: <offramp: They are not passers: they are already passed.> "Passer" is slang for "passed pawn.">

You'll have to change it to <passeder>.>

No we don't.

It's similar to saying "Where are you at?" Grammatically, it is wrong, but everyone says it and everyone knows what it means.

Just as everyone says passer and everyone knows what it means. Besides, <AW> couldn't change the usage on his own even if he tried.

Premium Chessgames Member
  Willber G: <al wazir: I got 48. f5+ Kd7 49. e6+ Kd6 all right, but then I would simply have swapped Rs and pushed the passers: 50. Rxd3 Nxd3 51. e7 Rb8 52. f6. If now 52...Ke6, then 53. Bg4+ Kf7 (53...Kxe5 54. f7) 54. Nc7, followed by 55. Bd7.>

I thought that but couldn't find a win for white after 52...Ne5

Apr-13-14  BOSTER: To lose such position (diagram) is not easy.
Black to play 16...

click for larger view

After forced 16...Nc7 17.Qxe8 Rfxe8 18.Rd7 Rac8 And now we are here

click for larger view

if 19.Bc4 b5

Apr-13-14  Rookiepawn: I don't get myself, I do fairly well with many insanes, and then I fail with obvious easy/medium stuff.

<al wazir> and <morphishine> Here I went the same way as you, swapping rooks seems the easiest way, but...

48. f5 Kd7
49. e6+ Kd6
50. Rxd3 Nxd3
51. e7 Rb8
52. f6 Ne5!

...and I think the pawns are stopped dead. I'm just a rookiepawn so... Help?

Apr-13-14  Patriot: I worked on this problem with a friend, and mistakenly left out the g2 pawn. Black had the material edge and we concluded 48.f5+ was the only try for white as counter-play. White is especially forced to play this since doing otherwise is being down material.
Premium Chessgames Member
  chrisowen: I mined for one at flight aim caps a give free:

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Premium Chessgames Member
  chrisowen: Watch I 51.e7 gxf5 52.e8Q (5.29) ja ship eddy a wave in sensed king out of reach a leggy rates encircle sip and meld e8 a lemon e6 was shaped the deed indeed again manage have good black now ledge d6 brevity a length in e8 pass leeway in lights a mettle pawn runs ammok combustible a king black d6:

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Premium Chessgames Member
  al wazir: <Willber G: I thought that but couldn't find a win for white after 52...Ne5.>

<Rookiepawn: 52. f6 Ne5! ...and I think the pawns are stopped dead.>

In the interests of language precision, let me point out that I never claimed this line as a win for white. I merely reported what I would have played. In fact, if you look closely at what I wrote (<I got 48. f5+ Kd7 49. e6+ Kd6 all right, but then...<<>>>), you'll see that I implied that this attempt fails.

Apr-13-14  Rookiepawn: <al wazir>

In the interests of language precision, let me point out I never implied you claimed anything. I just remarked I got the same idea (swapping rooks) as you and <morfishine>.

I didn't claim it was a winner either, I just found out Black's Ne5 and asked for help, that's all. Maybe a winner, maybe not.

In fact, after a little analysis I think it can still be a winner. Pawns are stopped, but Black is frozen. White's plan should be bringing the K to the h and g Black pawns and Black K cannot make it on time.

...or so I think.

Apr-13-14  Rookiepawn: ...and of course, it is clear that even if a winner, what was played in the game is far better.
Apr-13-14  Sally Simpson: "The potential passed pawn is a 'Candidate-Passer."

"Now you're being silly, Sally!"

It's a Kmoch term from 'Pawn Power' I's been years since I read it. I'm sure I'm right. It's sounds right.

Premium Chessgames Member
  agb2002: White has a bishop and two pawns for a rook.

Black threatens 48... Rxd5.

The pawn on f4 prevents 48.Nf4+. This invites to play, 48.f5+:

A) 48... Kxf5 49.Bg4#.

B) 48... gxf5 49.Nf4+

B.1) 49... Kd7 50.Nxd3 wins a rook (50... Rb3 51.Nxc5+, etc.).

B.2) 49... Ke7 50.Nxd3 Rb3 51.Nf4 Rxe3 (51... Ne4+ 52.Kh2) 52.Nd5+ Ke6 53.Nxe3 Kxe5 54.Nc4+ + - [B].

B.3) 49... Kf7 50.Nxd3 wins a rook (50... Rb3 51.Bd5+, etc.).

C) 48... Kd7 49.e6+

C.1) 49... Kc6 50.Nb4+ Kd6 51.Nxd3 Rb3 52.e7 + -.

C.2) 49... Kc8 50.Rxd3 Nxd3 51.e7 Kd7 52.f6 Ne5 53.Nc7 + -.

C.3) 49... Kd6 50.Rxd3 Nxd3 51.e7 Rb8 (51... Kd7 transposes to C.2) 52.fxg6 hxg6 53.Be4, unclear.

C.4) 49... Kd8 50.e7+ Ke8 51.Nc7+ wins.

C.5) 49... Ke8 50.Rxd3 Nxd3 51.fxg6 hxg6 52.Be4 Ne5 53.Kf4 and White seems to win at least a pawn.

D) 48... Kf7 49.e6+ looks similar to C.

Apr-13-14  TheBish: Tomashevsky vs W So, 2013

White to play (48.?) "Insane"

White has a bishop and two pawns for a rook (plus a rook and knight each), but the e-pawn is passed and will win the game. He just needs to get it going:

48. f5+! Kd7

Or 48...Kd7 49. e6+ is similar, but not 48...gxf5?? 49. Nf4+ or 48...Kxf5?? 49. Bg4#.

49. e6+ and now:

(A) 49...Ke8 (of course not 49...Kd8? 50. e7+ Ke8 51. Nf6+ and 52. e8=Q+) 50. Nf6+ Ke7 51. Ng8+! Ke8 52. Bc6+ and wins.

(B) 49...Kd6 50. Re1!

Rooks belong behind passed pawns, so why trade it? Now losing is 50...Rxf3+ 51. Kxf3 Kxd5 52. e7 and queens next.

50...Rb8 (anticipating the e-pawns advance) 51. e7 Re8 (or 51...Kd7 52. Nf6+ and the pawn queens next move) 52. f6 and the pawn roller will force a pawn through to queen.

I think this is easier than yesterday's (Saturday's) puzzle, assuming I didn't miss anything (which is easy to do on an "insane" puzzle).


Looks like I got it... yes!

Apr-13-14  Moszkowski012273: Yeah 50.RxR... works just as well. Easiest Sunday in awhile.
Apr-14-14  PJs Studio: Yes, not bad for an "insane" level puzzle. Great puzzle thou as it's an instructive middlegame by white.
Apr-15-14  morfishine: <Rookiepawn> Good point! Probably the hardest aspect of visualizing a continuation is making the very best moves for both sides


Premium Chessgames Member
  LucB: <It's a Kmoch term from 'Pawn Power' I's been years since I read it. I'm sure I'm right. It's sounds right.>

Well, I've never read the book, so who am I to argue with Herr Kmoch or Frau Sally?


Jun-05-14  MariusDaniel: Nice game!!
Feb-27-15  Whitehat1963: I don't understand why black allows his dark-squared bishop to be taken on move 19. There were so many ways to protect it: Kf8, Re8, Nc7, Bc5, Bf8. Doesn't any of those moves work? What's the danger?
Jan-25-16  epistle: Because his style is rock solid: rocks watch opportunities come and go.
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