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Suri Vaibhav vs Magesh Chandran Panchanathan
Commonwealth Championship (2008), Nagpur,India, rd 6, Oct-02
Italian Game: Two Knights Defense. Modern Bishop's Opening (C55)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 3 OF 3 ·  Later Kibitzing>
Dec-07-11  GreenLantern: <FSR: This seems harder than a Tuesday puzzle to me.>

It is .. and even harder than a Wednesday puzzle to me ;-) I went with <31.Rxa5> and was disappointed in my puzzle-solving abilities until I saw I was in good company.

Dec-07-11  5hrsolver: looked at 31.Rxa5 first which is not bad in itself (31...Ne3+ doesn't work because of the back rank mate). Then I started looking for other ideas as improvement. Particularly one with back rank mate motiff. That's when I saw 31.Qb4. What a great move by Suri trapping the rook.
Dec-07-11
Premium Chessgames Member
  agb2002: White is two pawns down.

Black threatens 31... Ne3+.

The black rook looks trapped, especially after 31.Qb4 with the double threat 32.Qb8+ and 32.Qxc3:

A) 31... axb4 32.Ra8+ and mate next.

B) 31... Rc1 32.Qb8+ and mate next.

C) 31... Rxg3+ 32.hxg3 (32.fxg3 Ne3+ and mate next) + -.

Dec-07-11  sevenseaman: <Apoline48> No one has missed the fact that a base rank mate was on. It is the execution that has been the problem. <31. Qb4> is by no means an easy move to see.

Good on those who saw it. To miss it OTB is one thing but so many solvers missing it in a puzzle only shows how tough it was.

Dec-07-11  LIFE Master AJ: My first try was 31.RxP/a5, with some nasty threats on the last row. But then I realized that one Pawn probably was not decisive ... the lead me to look for something else.

Upon further reflection the right try seems to be 31.Qb4! Black can try to stir up problems for White with 31...Ne3+; I am not sure what White's best reply is. Looks like 32.fxe3, RxP/e3; 33.Qd2, leaves White a piece ahead.

Time to check, and see how this one played out.

Dec-07-11  LIFE Master AJ: I feel that, (unless I was on my toes); I would have missed this one in a game.

One of the things (here) is when doing the daily problem, you KNOW there must be a tactical shot in there somewhere ... you don't ever have this kind of assurance when playing an OTB game.

Dec-07-11
Premium Chessgames Member
  kevin86: A brilliant move-the queen (immune) forks the rook and knight and one must be lost.
Dec-07-11  CHESSTTCAMPS: <<agb2002:> . .... Black threatens 31... Ne3+.>

I knew I could count on <agb2002> to come through with this key observation up front.

Threat recognition is perhaps the most difficult skill to master, especially for those of us who focus on offense. Clearly it was an issue for Suri Vaibhav in this game, missing the rather subtle threat of Qb4 in the process of grabbing a 2nd (poisoned) pawn.

Dec-07-11
Premium Chessgames Member
  doubledrooks: White hauls in the point with 31. Qb4, threatening a back-rank mate and the Black rook. And if 31...axb4 then 32. Ra8+ Qd8 33. Rxd8#
Dec-07-11  Marmot PFL: Found this fairly quickly, maybe cause I've been playing blunders like black did here myself recently. Black should have thought more and played a move like h6 before going into this line, unless it was a blitz or rapid game.
Dec-07-11
Premium Chessgames Member
  FSR: <LIFE Master AJ: ... Upon further reflection the right try seems to be 31.Qb4! Black can try to stir up problems for White with 31...Ne3+; I am not sure what White's best reply is. Looks like 32.fxe3, RxP/e3; 33.Qd2, leaves White a piece ahead.>

33.Qb8+! forces mate.

Dec-07-11  LIFE Master AJ: I will tell you a true story.

About a year ago, a club member showed me a position. He indicated it was a game that he had played, actually it was a GM game.

The move that I picked was like the second choice of Fritz, the best move was a Q-sack ... leading to a forced mate in around 11 moves.

The point? Your mind-set determines a lot.

Again, when doing the POTD, you dig until you find something. In a regular OTB game, you might never even break out the shovel ...

Dec-07-11  JCRchess: 29. Qc5! Rd3?? Unless black was under severe time pressure, it's hard to imagine a player of this caliber leaving a back rank this weak.
Dec-07-11  BOSTER: The black position has two weaknesses: bank rank and unprotected rook on b3. Playing Qb4 white shot both of them.

This tactic is called double attack,and it is very popular in chess.

About the <status> of the "a5" pawn. When rook a1 is aiming to "a8" with mating threat, I don't think that this pawn can claim I'm free in movement.

I'd say this pawn is pinned to "a8" mating square, what I called <Boster's pin>.

Talking about his book R.Keene said something like this. " I included in my book many games ,which I played. Many authors, who are doing the same, usually explain that their knowledge about "own" games the best. In my case the reason is another -a vanity".

This is why I called the <pin to the mating square> as <Boster pin>.

Dec-07-11  BOSTER: <dzechiel> <Doing Christmas cards, taking a break>. It's not easy to play simul.chess and cards.
Dec-07-11
Premium Chessgames Member
  thegoodanarchist: got it!
Dec-07-11  Ja Dood: I kind of like 31. Rb1 when 31..Ne3+ is just answered by 32. Qxe3 but maybe this is not best. The threat of Rb8+ however seems quite strong.
Dec-07-11
Premium Chessgames Member
  chrisowen: Finally it came truee number it his days ar it dog in ceeding

ground hammered it rxc3 in con it two pawn up ok easy it black

has it dug in but light sees it a win lovely it is qb4 is'nt

it?

Dec-07-11  1stboard: Another case of no flight square for the ( Black )king leads to trouble. The queen move takes advantage of this and the threat of a back rank mate or winning of material. Capablanca always provided a flight square for his king. Except in that famous game against Bernstein .....

http://chessgames.com/perl/chessgam...

Dec-07-11  1stboard: Lifemaster AJ , with regards to your true story post .....

I learned a long time ago from Chernev, play the moves that force the win in the simplest way, leave the brilliancies to Alkekhine, Keres and Tal ( and I would add Capablanca , Fisher , Steniez , Botvinick , etc. )

Dec-07-11  sevenseaman: < FSR: <LIFE Master AJ: ... Upon further reflection the right try seems to be 31.Qb4! Black can try to stir up problems for White with 31...Ne3+; I am not sure what White's best reply is. Looks like 32.fxe3, RxP/e3; 33.Qd2, leaves White a piece ahead.>

33.Qb8+! forces mate.>

<FSR> Aah, the ironies of puzzle solving on the <POTD> forum! You have to explain the import of the solution even to those who seemingly got it?

Dec-07-11  rilkefan: <<al wazir>: Though <FSR> and <dzechiel>, two paladins of puzzle-solving, had trouble with this one, I found the solution almost instantly. My rating hasn't suddenly risen 500 points (as Vaibhav's apparently did), so it must have been just a random flash in the brain pan. One swallow doesn't make a summer, or a banquet. The easiness or otherwise of a puzzle is subject to big statistical variations.>

I suspect you and I are of similar problem-solving or perhaps better stated chess ability, and I too got this puzzle immediately. I wonder if sometimes a weaker player is more likely to solve a puzzle because a stronger player's evaluation function tends to assume that simple direct caveman-level mate threats (what I looked for here) don't exist. (This is surely an obvious consequence of some No Free Lunch theorem in optimization theory.)

Dec-09-11  LIFE Master AJ: <<Dec-07-11 1stboard: Lifemaster AJ , with regards to your true story post .....

I learned a long time ago from Chernev, play the moves that force the win in the simplest way, leave the brilliancies to Alkekhine, Keres and Tal ( and I would add Capablanca , Fisher , Steniez , Botvinick , etc. )>>

You are 100% correct.

However, there is also something to be said for trying something you have never done before. For every game I played in a tournament, (and won); there were hundreds of blitz games ... and many tournament games ... where I tried something that did not work out too well.

Dec-09-11  JoergWalter: <LIFE Master AJ: where I tried something that did not work out too well.>

your father's words?

Dec-09-11  Nemesistic: <JoergWalter> I think <Andrew James Goldsby>'s alluding to his "Instructive Video's" and Award winning webpages LOL
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