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Another example of randomized Nash equilibrium

From an interview with Vladimir Kramnik.  Note that Kramnik is playing in a regular chess tournament, shortly before with world championship match with Anand:

Is it difficult for you, because of course you cannot show your preparations, your openings for the match, so you have to choose, let us say, not your real openings...

Yes, sometimes. But it is nor really about this, it is about that fact that sometimes it would be too simple if you don't show anything. That also gives a lot of information to your opponent. Then he knows that what you played you will for sure not play in the match. That is why you need to mix. Some things. I have to show, some things I don't show. So I am trying to confuse as much as possible my opponent. And this is a bit difficult. Before each game I start to think if he plays this should I play this or should I play that, or even during the game I start to think maybe I should play this or maybe I shouldn't play it. It is a little bit confusing I would say. It is easier to play when you don't have such an event in front of you.

Kramnik has been playing indifferently lately, yet when times demand he can be the world's strongest match player.  Anand is the current world champion, noting that he won the title through a tournament structure.  Match chess is all about adjustments and stamina and defense and preparation and strength of will.  Winning tournaments requires that you beat the weaker players consistently and that has never been Kramnik's strength.

Anand, by the way, can play speed chess almost as well as he plays classical slow chess.  He is an amazing tactician and a brilliant defender.  But does he have a deep enough strategic style to prevail in a longer and tougher setting?  I'll let you know how the match goes.

Posted by Tyler Cowen on August 26, 2008 at 06:37 AM in Sports | Permalink

Comments

Yeah he should just use a computer to tell him which (randomly chosen) variations to play at the tournament.

Posted by: mk at Aug 26, 2008 8:44:12 AM

Is there a ethical problem here? Kramnik may not be playing all-out to win this particular tournament. In particular, does the need to keep Anand guessing mean that he will in effect deliberately play more weakly against some opponents than others?

Posted by: Bernard Yomtov at Aug 26, 2008 9:43:37 AM

This evinces a fundamental misunderstanding of mixed strategy NE. In such an equilibrium, each player is indifferent between mixing and not mixing, given that the other player is mixing. Kramnik is clearly not so indifferent in the quotation above.

Posted by: js at Aug 26, 2008 10:46:14 AM

You evince a fundamental misunderstanding of the post, JS.

Posted by: here today, guano tomorrow at Aug 26, 2008 10:59:20 AM

here today, guano tomorrow ,

You should consider changing your nic to hero today, guano tomorrow.

Just a thought.

Posted by: happyjuggler0 at Aug 26, 2008 1:14:32 PM

How so?

Posted by: js at Aug 26, 2008 3:03:31 PM

I think he learned all of this from Charlie Brown.

This was a strip in the Peanuts once. Charlie Brown is on the mound talking to himself.

Frame 1: "This guy will never be expecting a fastball..."

Frame 2: "With the bases loaded he'll be expecting a curve. But he also knows I know what he's expecting..."

Frame 3: "So if he's expecting me to pitch what I know he knows I know he knows he's expecting..."

Frame 4: "Where was I?"

Posted by: Cyril Morong at Aug 26, 2008 4:28:51 PM

What did the man on a liquid diet say when asked why he turned down a roast beef sub?


A:

Hero today, guano tomorrow.

Posted by: happyjuggler0 at Aug 26, 2008 7:51:09 PM

A slight mistake in the post -- Kramnik is currently the chess world champion. Anand possesses the #1 rating in the world, but is not world champion.

Posted by: mrsmith at Aug 27, 2008 2:13:27 PM

Sorry Mr Smith, Anand IS the world champion. He won it in Mexico in a tournament with six players where Kramnik also played (besides Morozevich, Svidler, Grischuk, Gelfand).

I was there :)

Posted by: PlanMaestro at Aug 28, 2008 9:40:07 AM

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