How unusual is a super gm blundering (as white) on move 13?

Very. But I mean it's possible for a GM to blunder at any point, just more likely as a game wears on. Not that it's completely similar but Naka blundered (a more complex blunder) vs. Karjakin in the championships and it lead to that debacle of a WCC. Perhaps Naka just goes on autopilot in openings too often where he doesn't calculate things out fully any longer.

depends on what we consider
a)blunder
b)the time controls
c)importance of game

How about move 5?

[Event "Biel-B"]
[Site "Biel"]
[Date "1988.??.??"]
[Round "9"]
[White "Zapata, Alonso"]
[Black "Anand, Viswanathan"]
[Result "1-0"]

1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. Nc3 Bf5 6. Qe2 1-0

So a couple of years before this game Tony Miles and Larry Christiansen played out the same 1st 5 moves only Miles who had White failed to play Qe2! They agreed to a quick draw and I think it's mostly understood that this was a pre-arranged draw. (If It wasn't then this horrific blunder happened twice, and with another GM failing to capitalize!)

However, the Miles-Christiansen game was published in the informant with a 'note' indicating that that 5... Bf5 was a "theoretical novelty" Its also thought by some Anand may have seen this and blindly trusted the informant, who knows... certainly if they had computers in the 1980s none of this would happen.

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So does 5... Bf5 seem unfathomably stupid? I decided on a whim to play Petroff's while in a CCA tournament in Boston, MA and had 'decided' to play Bf5 in this position. After a think i realized what a stupid move I was considering and then also realized I had seen this Anand game before and laughed at myself internally for almost doing it myself. But the strange part of this story:....

My opponent was Natasha Chistiansen (Larry Christiansen's Wife)

Brag : just reached 2000 blitz on FICS after 18 years playing.

wtg

FICS is one of the harder sites ime. I hovered around 1450 there and hover around 1750 on lichess, similar on chesscube.

Every couple of years I remember that chess is a thing and play a bunch. I'm terrible at chess, but it's fun. I'm currently in the midst of one of those "play a bunch" and registered on chess.com for the first time.

A fun thing I've noticed is that people will resign games against me that I'm clearly ahead in but little do they know I'm pretty bad at chess and it's totally possible I won't know what I'm doing and will end up not converting a material lead into a win.

lol

Solid brag man.

I'm fresh off an 8 game winning streak. I drew out of respect after a great game was ruined by my opponents misclick.

YouTube---> crash Davis respect the streak

LOL. Exhibit a on me being bad at chess. Overlooked the same mate in 1, twice. The first time my opponent also overloooked it and the second time I wondered why the **** he was resigning.

LOL, nice that's nice.

Well this is a first, my opponent just resigned to me when I had the bare king in a drawn KB+rP vs K.

Still a draw though, isn't it?

Edit: As a matter of fact, it is between that an 0-0.5. Not sure which one You definitely do not get a 1.

lichess gave me a 1.

Maybe that's how I'll be resigning in the near future... for now, I've just resigned in an equal (as per Stockfish) endgame position (with two rooks, a minor piece and 4 pawns on each side, even temporarily 5 pawns on mine). Well, I couldn't find a good move, and I had less than half a minute on the clock vs the opponent's several minutes, but the game was with an increment (5+3) so I could have kept playing and hoping for a miracle, however, I didn't want to bother my opponent by dragging the game out for too long

Somehow chess is a more embarrassing game to me than poker. Maybe that's because my cash game opponents are free to run away when they become bored or busy, but my chess opponents can't

I'll only show you the critical position, which looks quite instructive (an opening tactic that is more typical of the Vienna Game, I guess). I failed to find the best move for White which should really have been part of my prep. Also, I'm clearly lacking board vision , otherwise I would have found the move right away.



The solution:

The position actually arose from a weird French variation where Black didn't play d5. The starting moves of the game were 1. d4 e6 2. e4 Nf6?!, and it turns out that this knight move is bad already. How can White punish Black for 3. e5 Ne4?!

The solution:

You prep for 5+3 games?

Btw, my first thought was the correct first move but I do not play open games and do not know if I would take the time to calculate that confidently at that time control as I'd have to see the last move and also be okay with other intermediate moves which seem potentially tricky.

I have huge issues with time management so I'd rather play instantly during the opening, especially because the issues are going to be worse in 3+2.

I mean, I'm just not sure what prep looks like for a 5+3 game. No clue who your opponent is, no clue what opening will be played.

Or you just mean your opening repertoire in general needs to be more extensive and/or memorized better?

Yes, I meant exactly this, sorry for the confusion. It wasn't a pre-arranged match.

Beat: the Russian Chess Federation has rolled out a poorly designed national rating system.

An untitled player who enters their first RCF rated tourney gets an initial RCF rating equal to their FIDE rating if the former exists.

However, if they haven't got any FIDE rating or national title prior, their RCF rating is set to 1000 As a result, they'll get a much lower RCF rating than the FIDE one at the same first tourney, unless they travel abroad (e.g. to Belarus) to play their first 5 FIDE rated games and initialise the FIDE rating prior to the RCF one.

All the other formulas of RCF rating adjustment mirror the FIDE ones.

This is going to result in a huge deflation of RCF ratings (as properly rated players will be losing points to strong opponents who're underrated because of being assigned an initial rating of 1000) and them being meaningless numbers as opposed to the FIDE ones.

National titles will be awarded on the basis on the national rating starting from year 2018, however, they don't give any social benefits since the dissolution of the USSR (except for very strong sportsmen like European Championship medalists), so the beat is tiny