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Douglas Cristhian Cadelago vs Sebastian Decuadro
48th World Junior Championship (2009), Puerto Madryn ARG, rd 10, Oct-31
Sicilian Defense: Najdorf Variation (B90)  ·  1-0

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Mar-12-19  Cheapo by the Dozen: At first glance, this doesn't look like a position in which Black's responses will be utterly forced -- but they are.
Mar-12-19  Cheapo by the Dozen: The puzzle could have started one move earlier, but no further; 32 ... Bg7 actually gives Black a lot of chances.
Mar-12-19  zb2cr: Congratulations, <patzer2>, on your grandson's successes!

To the puzzle: After getting looking at a possible Queen sacrifice out of my system, I found the forced mate in 4: 34. Rd8+, Rxd8; 35. Rxd8+, Rxd8; 36. Qxd8+, Bf8; 37. Qxf8#.

Mar-12-19  vonKrolock: The diagrammed finish is quite trivial, but a few movements before, there was a very interesting possibility:

After <32.♖d6>


click for larger view

Now with 32...♘xd1! 33.♖xa6 ♖d8!! 34.g7+ !? ♗xg7 35.♖xa8


click for larger view

Now Black can draw immediately with a perpetual, or even consider playing for a win taking in a2 and a8...

Mar-12-19  goodevans: <vonKrolock> I believe it's more accurate to play <...Nc3+> before <...Rd8> (as per my previous post) as this removes the possibility of white freeing his K with <34.c4>.

In both cases the threats and options available to black remain the same.

Mar-12-19  vonKrolock: <goodevans> Yes, You're right: it's better to avoid the c2-c4 possiblity... (BTW i didn't read your previous post before posting myself - Yes, we picked that ♘xd1 independently 😉...
Mar-12-19  BOSTER: The real puzzle is:Why black did not play 29...Nxd1 with win?
Mar-12-19  karik: And also 32...Nxd1 wins.
Mar-12-19  patzer2: <jith1207><sensex><Once><zb2cr> Thanks. My Grandson read your posts and sincerely appreciates your acknowledgement of his Chess accomplishments.

I should also mention that my 10-year-old Grandson helps his Mom (my Daughter) teach a free Chess class which is held twice a month in his home town.

Four of those students also won trophy awards in the Texas Scholastic Chess Championship, including a first place 7-0 (no losses) result in the Middle School Novice section, a third place 6-1 (six wins and one loss) finish in the elementary novice section and a 20th place finish (four wins, one draw and two losses) in the elementary unrated section, and a positive (four wins, three losses) result in the elementary unrated section.

One reason I didn't post much this past weekend is that I was busy analyzing the games of my Grandson and his friends in-between rounds. In only a few cases did I need to help parents console and encourage young players experiencing losses in the tournament.

Mar-12-19  Patriot: <Honey Blend> I think the key move in your example is 1.Rf3 since it guards f1 from the queen and the rook thus threatening 2.Nh6. 3.Rxf6? Rxf6 and black may not recapture.
Mar-12-19  Patriot: Sorry I meant 2.Nh5.
Mar-12-19  Patriot: I'm making mistakes on this small screen. I also meant 1...Rxf6 2.Rxf6.
Mar-12-19  Patriot: I just checked...1...Qe2 refutes it.
Mar-12-19  Momentum Man: Difficulty level resets every Monday then. Right?
Mar-12-19  Damenlaeuferbauer: My solution is mate in four: 34.Rd8+,Rxd8 35.Rxd8+,Rxd8 36.Qxd8+,Bf8 37.Qxf8# A very interesting Sicilian Najdorf!
Mar-12-19
Premium Chessgames Member
  al wazir: <patzer2: He went 5-0 undefeated in a five-round swiss (5 minutes no delay), but had to settle for second place on tie breaks because there was no play off for first place between the two 5-0 finishers in this five round blitz tournament.

In the classical Chess competition, he tied for the second best result in winning six out of seven games. His only loss was to an expert who won first place.> What is his rating?

Mar-12-19
Premium Chessgames Member
  ajk68: 1.5 stars? I was staring at this trying to see what I was missing and determined I wasn't missing anything.
Mar-12-19  DWINS: <ajk68>, I was wondering the same thing! Perhaps one star is reserved for mates in one but this is as easy as it gets.
Mar-12-19  alshatranji: Easy shouldn't be the same as dull.
Mar-12-19
Premium Chessgames Member
  drollere: < 1.5 stars? I was staring at this trying to see what I was missing and determined I wasn't missing anything.>

you're missing that you should ignore the difficulty rating.

none of these positions has any objective rating, for example a rating made by a team of ranked players.

my current hypothesis is that there is a single person choosing a more or less random puzzle and giving it a rating that corresponds to the day of the week.

what is the player rating of this person?

you don't know.

how long do they spend thinking about the difficulty of the puzzle?

you don't know.

what do you know?

you may know that most of us have already found the ratings to be uninformative, erratic, unreliable.

which is no shade, because every puzzle shows the position presented to two players, one of whom analyzed the position correctly and another who did not.

in other words, it was easier for one player than the other.

so whose rating would be correct?

Mar-12-19
Premium Chessgames Member
  drollere: <goodevans>. very pretty. 39. Qd6 .. ?
Mar-12-19  patzer2: <al wazir> After the Texas state scholastic tournament this weekend, my 10-year-old Grandson's USCF rating went up from 1426 to 1497. His performance rating in the classical chess portion of the state tournament, where he scored 6 out of 7, was USCF 1803.

The state scholastic blitz tournament was not rated, so he doesn't get any credit for going 5-0 there.

His chess.com and chessbase.com tactics ratings are consistently over 2000 and have been as high as 2100. My experience in working with younger players is they usually get to within 300 to 400 points of their tactics rating in regular chess.

As he's already won regular chess games against class A players and has beaten an IM in blitz, I wouldn't be surprised to see him break 1600 or 1700 in the next year or two.

Mar-12-19  BOSTER: Even with such iconic knight on a1 white should not play 22. Rd1.
Mar-12-19  SpamIAm: <drollere> what rating would be correct? Too Easy. :)
Mar-12-19  lost in space: 34. Rd8 and that‘s it
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