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agb2002
Member since Jun-28-08 · Last seen Apr-19-14
I'm an applied mathematician who lives in the south east of Spain. I'm not rated.

My favorite players are those considered the best endgame artists of all time: Lasker, Rubinstein, Capablanca, Smyslov and Fischer. I also tend to prefer the strategists (Botvinnik, Karpov, Kramnik) and the universal style players (Spassky, Anand) to the tacticians. However, I like accurate chess regardless of the players and styles.

My approach to the puzzles is similar to that of David Zechiel (User: dzechiel): I first write the variations I find in a reasonable amount of time (using the puzzle diagram only) and post them before watching the game or other's comments. Then I have a look at them and try to be critical with my work. I apply the touch-move rule to my posts (see Unzicker vs Fischer, 1960). I hope to improve my tactical vision this way.

Often I cannot even spend a couple of minutes looking at the diagram (work, family, other interests, etc.) so I try to blind solve it along several breaks. My first attempt was R Vera vs S Garcia-Martinez, 2001 and although the variations I found were not very deep I felt quite satisfied with the experience.

I became interested in puzzle Elo ratings after trying to find a way of measuring my progress with these exercises. However, computing just rough estimates of the Elo rating of a given puzzle is a difficult problem. Some strategies to accomplish this are:

I. Machine estimates. This method is pursued by User: MostlyAverageJoe so you should refer to his forum for further details.

II. FIDE Elo distribution. This method assumes that the following more or less reasonable assumptions hold:

1) The puzzle kibitzer Elo distribution is close enough to that of FIDE rated players.

2) A player with Elo x is a good representative of the players belonging to the Elo interval [x-25, x+24].

3) Kibitzers are objective and only claim the point when they really worked out the complete solution.

I have approximated the FIDE Elo distribution with this table (source http://www.fide.com, Dec 31 2008):

__A_ | __B_ | __C_ | __D__ | __E__ | ___F___
1325 | 1300 | 1349 | 99209 | ____0 | 100.0000
1375 | 1350 | 1399 | 99209 | ____0 | 100.0000
1425 | 1400 | 1449 | 99209 | __185 | 100.0000
1475 | 1450 | 1499 | 99024 | __373 | _99.8135
1525 | 1500 | 1549 | 98651 | __558 | _99.4376
1575 | 1550 | 1599 | 98093 | __850 | _98.8751
1625 | 1600 | 1649 | 97243 | _1286 | _98.0183
1675 | 1650 | 1699 | 95957 | _1851 | _96.7221
1725 | 1700 | 1749 | 94106 | _2594 | _94.8563
1775 | 1750 | 1799 | 91512 | _3511 | _92.2416
1825 | 1800 | 1849 | 88001 | _4677 | _88.7026
1875 | 1850 | 1899 | 83324 | _5879 | _83.9883
1925 | 1900 | 1949 | 77445 | _7053 | _78.0625
1975 | 1950 | 1999 | 70392 | _8236 | _70.9532
2025 | 2000 | 2049 | 62156 | 10602 | _62.6516
2075 | 2050 | 2099 | 51554 | 11189 | _51.9650
2125 | 2100 | 2149 | 40365 | 10541 | _40.6868
2175 | 2150 | 2199 | 29824 | _8745 | _30.0618
2225 | 2200 | 2249 | 21079 | _7531 | _21.2471
2275 | 2250 | 2299 | 13548 | _5311 | _13.6560
2325 | 2300 | 2349 | _8237 | _3358 | __8.3027
2375 | 2350 | 2399 | _4879 | _1993 | __4.9179
2425 | 2400 | 2449 | _2886 | _1367 | __2.9090
2475 | 2450 | 2499 | _1519 | __643 | __1.5311
2525 | 2500 | 2549 | __876 | __451 | __0.8830
2575 | 2550 | 2599 | __425 | __238 | __0.4284
2625 | 2600 | 2649 | __187 | __109 | __0.1885
2675 | 2650 | 2699 | ___78 | ___46 | __0.0786
2725 | 2700 | 2749 | ___32 | ___20 | __0.0323
2775 | 2750 | 2799 | ___12 | ___11 | __0.0121
2825 | 2800 | 2849 | ____1 | ____1 | __0.0010
2875 | 2850 | 2899 | ____0 | ____0 | __0.0000

where column A is the Elo representative of the class of players determined by columns B and C, column D is the amount of players stronger or equal, column E is the amount of players in the corresponding class and column F is the percentage of players stronger or equal.

Now, if, for example, 70% of us solved completely the puzzle, I would rate it at Elo 1975 or better, between 1950 and 1999 points.

Unfortunately, not all of us publish (an excerpt of) our findings to 'prove' that we got the solution (or a terrible embarrassment...). This translates into many computational problems: from strong bias (as pointed out by John Spouge, see agb2002 chessforum) to such lack of resolution that assessing the more difficult puzzles becomes impossible (see agb2002 chessforum).

III. Puzzle characteristics. There are some features in every puzzle that can be used as metrics to evaluate its difficulty, for example, the type and number of tactical motifs, the number and depth of variations, the type and amount of material still on board, etc. For example, many players will solve the following puzzle immediately (White to move, Lasker's Manual of Chess, p. 116):


click for larger view

However, the next puzzle is considerably more difficult in spite of containing practically the same tactical motifs (White to move, Lasker's Manual of Chess, p. 119):


click for larger view

Once having collected a sufficient number of puzzles with their metrics and Elo evaluation (perhaps using method I) it might be possible to fit a several variable function in which the independent variables are the metrics and the dependent variable is the given Elo rating.

IV. Post characteristics. We can try to use some metrics from the posts to estimate its rating. These metrics would include:

1. CG assigned stars.
2. Posts issued on the puzzle's day.
3. Posts recognizing failure.
4. Plies to reach a clear decision, draw included.
5. MostlyAverageJoe's rating (thanks MAJ!).
6. Posts claiming (or implying) it was (too) easy.
7. Posts complaining (or implying) it was (too) difficult.

Once having collected enough data (from at least 30 puzzles) we would try to find the most suitable fitting model f:

rating = f(x1, ..., x7)

xi being the above variables, not necessarily all included in the model. For example, it could be as simple as

rating = 1200 + 100*plies

As a curiosity, this is a VBA function for the best fitting model I've found to date using the CG stars (cgs) as the only predictor variable (N = 181, R² = 0.688, asymptotic standard errors five times -at least- smaller that the corresponding coefficients):

Function MAJ_Rating(ByVal cgs As Double) As Double

Const a As Double = 861.15488885
Const b As Double = -0.555156265
Const c As Double = 0.156127404
Const d As Double = -0.015186844

MAJ_Rating = a / (1 + cgs * (b + cgs * (c + cgs * d)))

End Function

Comments are welcome.

>> Click here to see agb2002's game collections.

Chessgames.com Full Member

   agb2002 has kibitzed 2818 times to chessgames   [more...]
   Apr-19-14 Macieja vs H Kallio, 1999 (replies)
 
agb2002: Black is one pawn ahead. White threatens 21.K(Q)xa2 and 21.Qxd7+. The first threat and the position of White's heavy pieces suggests 20... Rxe2, protecting momentarily the knight and unblocking the a1-h8 diagonal: A) 21.Bxe2 Nc3+ A.1) 22.Ka1 Nxd1+ 23.Kb1(a2) Rxe2 24.Rxd1 (24.Qxe2
 
   Apr-18-14 J Sieglen vs K Wesseln, 1989 (replies)
 
agb2002: Black is one pawn down. The black king is under check. The obvious move is 31... Rxf5, weakening the light squares around the white king, 32.exf5 Bd5+ 33.Bg2 Qh3: A) 34.Bxd5 f1=Q+ 35.Qxf1 Qxf1#. B) 34.Qf1 Qxg2+ (or 34... Bxg2 35.Qxg2 f1=Q+ 36.Qxf1 Qxf1#) 35.Qxg2 f1=Q(R)#. C) ...
 
   Apr-17-14 V Nielsen vs C F Delcomyn, 1894 (replies)
 
agb2002: White has the bishop pair for two knights and four pawns. Black threatens 25... Nd2+. The pawn on f5 protects both knights. This suggests 25.Rxg4 or 25.Rxf5. In the case of 25.Rxg4: A) 25... fxg4 26.Bxf7+ A.1) 26... Kf8 27.Bxe8+ Kxe8 28.Qxe4 gxh3 29.e6 d5 30.Qh7 looks winning. ...
 
   Apr-16-14 L T Haller vs Robbins, 1884 (replies)
 
agb2002: Black is one pawn down. White threatens 31.Qxe5. Black has four pieces and one pawn to attack the black king. This suggests 30... Rxh2+ 31.Kxh2 Qxg3+ 32.Kh1 Qh4+ 33.Qh3 (33.Kg2 Rg3#) 33... Rxh3+ 34.Bxh3 (34.Kg2 Q(R)g3#) 34... Qxh3#.
 
   Apr-15-14 Benko vs W Hartmann, 1984 (replies)
 
agb2002: Black is a knight and a pawn down. White threatens 22.Ne5. Pattern recognition finds 21... Qxg2+ 22.Kxg2 Bf3+ 23.Kg1 Nh3#.
 
   Apr-14-14 L Josteinsson vs Petursson, 1984 (replies)
 
agb2002: Black has a knight for a pawn. White threatens 27.Qxf4. Pattern recognition finds 26... Nxf3+: A) 27.gxf3 Qxa2#. B) 27.Kh1 Qxa2#.
 
   Apr-13-14 Tomashevsky vs W So, 2013 (replies)
 
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 ...
 
   Apr-12-14 Kramnik vs Fressinet, 2013 (replies)
 
agb2002: Black has three pawns for a knight. White threatens Bc5, Rb3 or Ra3, etc. Also Ng3, Bf1 to improve the defense. The weakest point in White's field seems to be f2. Therefore, 25... Bxf2+: A) 26.Kxf2 Qf6+ A.1) 27.Ke1 Qh4+ A.1.a) 28.Kd1 Rh6 (28... g3 29.Bc5 b6 (29... a6 30.Bxa6 ...
 
   Apr-11-14 S Globus vs Gross, 1884 (replies)
 
agb2002: White has the bishop pair for a bishop, a knight and two pawns. The uncastled black king invites to play 16.Nxc6 Qxc3 (16... Bxc6 17.Rxc7+ wins) 17.Rxe7+ Kf8 18.Rxf7+: A) 18... Ke8 19.Re7+ Kf8 20.Rxd7+ A.1) 20... Qxa3 21.Rf7+ Kg8 (21... Ke8 22.Re1+ and mate next) 22.Rf3+ Kh7 ...
 
   Apr-10-14 M Esserman vs C Tsai, 2003 (replies)
 
agb2002: Houdini 2.0 x64 evaluates 20.Qxh5 at about +7.5 and 20.Rd6 at about +4.5, enough to win.
 
(replies) indicates a reply to the comment.

Calculo, luego existo

Kibitzer's Corner
< Earlier Kibitzing  · PAGE 5 OF 7 ·  Later Kibitzing>
Mar-17-10  loves chess: so many boards. so little time. And so many other subjects. OK DOES anyone know if the best 1000 short games of chess - chernev, has ever been printed in the NEW notations? (I learned with that book, and I still think P K 4 ) I can look at a chess puzzle and figure it out, but don't read the answer.
Mar-17-10  loves chess: To SugarDom - - I am not what I think I am. I am not what you think I am. I am what I think, you think I am. (philosophy class) Nietze?
Mar-18-10
Premium Chessgames Member
  agb2002: <loves chess: so many boards. so little time. And so many other subjects. OK DOES anyone know if the best 1000 short games of chess - chernev, has ever been printed in the NEW notations? (I learned with that book, and I still think P K 4 ) I can look at a chess puzzle and figure it out, but don't read the answer.>

Amazon.com only shows old editions.

<loves chess: To SugarDom - - I am not what I think I am. I am not what you think I am. I am what I think, you think I am. (philosophy class) Nietze?>

Descartes had a much clearer mind than most philosophers, including Nietzsche, who ended up in the loony bin. That's why I paraphrase the former with 'Calculo, luego existo' (I compute, therefore I exist).

Mar-26-10
Premium Chessgames Member
  agb2002: Week of weak castles and some loose pieces.

Jan 18, Monday: H G Cole vs A Tulip, 1946. Weak castle.

Jan 19, Tuesday: A Greenfeld vs J Redmond, 2008. Loose pieces and double threat.

Jan 20, Wednesday: Nakamura vs P Hanko, 2001. Destruction of defense.

Jan 21, Thursday: Tiviakov vs T Roussel Roozmon, 2009. Loose piece, pin and weak castle.

Jan 22, Friday: Stahlberg vs Najdorf, 1947. Loose piece, pin and weak castle.

Jan 23, Saturday: Krasenkow vs M Markovic, 1990. Weak castles, annihilation of defense, knight forks, back rank threats, etc. Very impressive and instructive. The puzzle of the week, imho.

Jan 24, Sunday: Short vs Ljubojevic, 1991. Weak castle. A rather involved attack.

Mar-30-10
Premium Chessgames Member
  johnlspouge: Hi, Antonio. I hope you and your family are well.

I recently found a beautiful book, "Concrete Mathematics" by Graham, Knuth, and Patashnik. You would probably like it: it has some unusual and very beautiful material.

Mar-31-10
Premium Chessgames Member
  johnlspouge: < <I recently found a beautiful book, "Concrete Mathematics" > [snip] The use I give to it is mainly recreational (from time to time I like to play discrete math to flex some problem solving skills or for curiosity), I rarely use it for professional reference. >

Yes, it is not an "industrial strength" book. The unified treatment of hypergeometric functions is unique, however, and if necessary, I plan to use their combinatorial notations, particularly for the Stirling numbers, in future papers.

Mar-31-10
Premium Chessgames Member
  technical draw: Concrete Mathematics? That shouldn't be hard. 1 bag cement, 4 shovels sand, 1 pail rocks. Mix and apply. Very easy.
May-27-10  CHESSTTCAMPS: <Welcome back, Phil!

I imagine that you were rather busy lately...>

Hi Antonio,

Thanks - you're right! I've thought of you lately with all of the concern created by the Greek crisis. In related commentary, Spain and Portugal are sometimes cited as the next dominoes to fall, but some knowledgeable commentators seem to think that Spain is more than two years away from real trouble - if that's much comfort.

Are you still considering relocating to the UK?

Regards,
Phil

May-31-10
Premium Chessgames Member
  johnlspouge: < <agb2002> wrote: I'm not sure. "We must know, we will know" seems to give the impression of determination, instead of sadness. >

In the context of an epitaph, I interpret the phrase as awaiting an exploration of the "Final Frontier". No doubt, Hilbert had all the ambiguities in mind.

In any case, I was not intending to convey sadness with my remark. See http://www.youtube.com/watch?v=jHPO... for a similar perspective. "Just remember that the last laugh is on you..."

Jun-01-10  CHESSTTCAMPS: Antonio,

Thanks for the update.

<..(we are the world leaders in number of bankruptcies, you know, ...)>

This was news to me.

< empires aren't cheap ...)>

Yes - and empires inevitably degrade...

<At the moment, I'm helping a small group of industrial food processing companies to refloat so I stopped looking for opportunities there several months ago.>

I'm glad you've found a worthwhile engagement that will keep you in Spain with your family for a good while longer. Best wishes.

Regards,
Phil

Jul-12-10  CHESSTTCAMPS: Did you enjoy the World Cup? Congrats to Spain! I was quite pleased to have two finalists who had never won it.

And to Nadal for winning Wimbledon - I am a big fan of tennis and Nadal. If Nadal wins the U.S. Open, I believe he'll be the only man other than Agassi to win all four majors and an Olympic gold.

Jul-14-10  CHESSTTCAMPS: <<Did you enjoy the World Cup?>

No. I expected a much nicer play from the Dutch team (nothing to do with Cruyft's team).>

Yes, I thought you might have this reaction. Unfortunately, this was the game I watched the most. There were several other games I wanted to see, but didn't because of inconvenient times. Agreed, the Dutch team was certainly not the team of Cruyff, which I watched a great deal of in the 1974 Cup when I was living in England. Apparently Cruyff slammed the tactics of the current Dutch team after Sunday's final.

<<Congrats to Spain!>

Thank you! Unfortunately, this is Spain's swan song ... >

You sound more pessimistic than I am about the US. However, I think that Spain will be more resilient than you suggest (not just talking about football, of course) .

<Nadal is a monster (he only needs to watch out his joints, particularly his knees). He belongs to this incredible generation (Pau Gasol, Fernando Alonso, Andrés Iniesta, Alberto Contador, etc.) which is accumulating victory after victory as nobody in Spain could have imagined just a few years ago. The explanation is not too difficult: it's just the culture of effort.>

Yes, these other top players get somewhat overlooked here because Nadal is so special. I was concerned last year that Nadal had burned himself out by overplaying and accumulating injuries, but he is back on top of game. Among his strengths, he is becoming a very strong volleyer, which will take some pressure off of his ground game as his knees age. So I wouldn't be surprised to see 15-20 majors before he's done.

I can identify with the problems of sore joints. In 2006, I played over 640 rated matches of tournament table tennis (a much more aerobic sport than most people realize). In total physical effort, ten hours of table tennis in a day certainly does not require nearly the total energy output of a tennis match, but the joints pay a price with that much play. During that year, I had problems with every joint - knees, wrist, elbow, and shoulder; fortunately, not all at the same time!

Jul-27-10  CHESSTTCAMPS: To follow up, Contador's recent victory #3 on the Tour was another great triumph for Spain this year. What astounding physical fitness. And I forgot that Gasol played for the World Champion Lakers this year, although I was already aware of his stature in the sport. (I am much more a fan of college basketball than the pros.) "Culture of Effort" seems to be a reasonable explanation for these successes.
Jul-27-10  CHESSTTCAMPS: There was an interesting piece on Spain's economy aired last week on the PBS News Hour (produced by correspondent Paul Solman). The link is http://www.pbs.org/newshour/bb/busi... . I was particularly impressed by the problem of commercial real estate overdevelopment, which is shared with the U.S.

This problem affects me directly, because I have an interest in a small commercial building in Delaware that is currently only half full - and the situation could get worse before it gets better.

Aug-02-10  CHESSTTCAMPS: <Catalonia's government prohibited bullfighting (another Spain's symbol) yesterday and they plan to replace the main plaza in Barcelona with a mosque. A similar phenomenom occurs in Europe. I'm afraid that's not my concept of resilience...>

Spain gets undereported in the U.S. media, but I did hear about the bullfighting prohibition and that certainly surprised me. I can understand why it would shock you. It would certainly be a pity if European countries lose some of their individual character, but a little of that is inevitable in a global economy and in a union that encourages free movement of people.

In using the expression, I was thinking more about economic resilience than cultural resilience.

<Do you think Big Foot's kids would be interested in some practical computational engineering classes?>

I don't know, he/she must be pretty clever to evade capture all these years. :)

<I know, although I have never played rated table tennis, only for fun.> Another sport that doesn't get enough respect in the U.S. There are probably millions of homes in the U.S. with ping-pong tables, but fewer than 10,000 people get involved enough to play in rated tournaments. Europe has far more organized competition in the sport.

<This reminds me when I go back to the gym after a long time without touching a barbell.> I need to get back to the gym, too. 4 years ago, I was in good shape.

<<"Culture of Effort" seems to be a reasonable explanation for these successes.> What else? I know because that's my culture.> I was also thinking of this in comparing Spain's economic situation with Greece. There seems to be a significant "culture of entitlement" there, at least according to Paul Solman's piece on the Greek crisis.

<<... an interesting piece on Spain's economy aired last week on the PBS News Hour (produced by correspondent Paul Solman......>

The report missed a number of essential facts, for example:

-The responsability of socialists and catalonian nationalists who rejected the building land regulation law devised by Aznar which would have made houses much cheaper.>

I'm interested in these issues that you have raised. PBS gives much more time and attention to stories than other media outlets, but even a PBS Newshour story is arranged to fit a 10-minute time frame.

<-The responsability of the national and local governments which not only permitted but also promoted that suicidal credit policy to banks and cajas de ahorro (savings banks). Can you imagine a credit for 120% of the price of an already ridiculously expensive house to be paid in 50 (!) years? Well, you don't need to imagine...>

You're right, I don't need to imagine, because the lending industry did similarly outrageous and irresponsible things in the U.S. with government complicity. I don't think there were any 50-year mortgages here, though.

<-The responsability of the unions, which are against any recycling of workers. If workers didn't have problems, who would need unions? Hence, they create problems to as many workers as they can, only to justify their obsolete, infamous existence.

The men from BBVA and La Caixa lied miserably. Mikel Abasolo is right: he gives a reasoning, the others don't.>

Interesting.

<Yes, and the problem is that we don't really know where the minimum of the curve is. In our case, it could be cuban levels. Not long ago we were about to become Europe's California. Now, we are falling to Europe's Cuba (unemployment already exceeds 20%).>

California might not be the most desirable model right now. It has many systemic problems including a huge state budget deficit. (continued)

Aug-02-10  CHESSTTCAMPS: <Have you considered any marketing resources to attract companies (a children daycare included) to your building? I'm afraid I don't have any experience with this to help.>

A very good suggestion, but unfortunately, the building is too small. I partnered with my brother in 2005 to buy the building for his family medical practice. He grew his patient base 5-fold, but the insurance payments from his patients were insufficient for him to make the practice sufficiently profitable to pay himself decently, so he closed it within 18 months of the building purchase. (The under reimbursement of primary care physicians - which is generally agreed to be the most cost-effective expenditure of health care dollars - was one of the valid reasons for passing health care insurance reform last year.)

The building totals about 6000 square feet, about 3000 of which are occupied. The major unocuppied area is a suite of 8 rooms, suitable for a small business or professional practice. In fact, I was interested in getting a child daycare center on the premises, but state legal and licencing requirements for such facilities are more strict than those for a medical practice. I had a prospective tenant who was interested in the building for this very purpose, but she balked at the price of improvements that would be needed to meet the regulations.

I do need to make more of an effort with marketing, but I've had to focus on other pressing issues recently.

In any case, thanks for taking the time to make suggestions and also for sharing your perspective on the current state of Spain.

Aug-02-10
Premium Chessgames Member
  Patriot: I don't have "Psychology in Chess" but I'm not sure we're on the same page. When I say "Look wide before you look deep", I mean more candidates should be considered up front before analyzing anything in detail. This can help in avoiding wasting a lot of time on useless lines when really there is a simple win if only the right candidate is considered.

In Saturday's problem I made the mistake of not considering enough candidates and thus missing the first best move. Sunday, I tried to make sure that didn't happen and came across what I thought were the two best moves, Qh5+ and Nxg7, which Fritz confirmed they were very close and best. I could've spent a long time looking at Nxc7 but cancelled that move early on because the prospects seemed poor. I think some kibitzer's spent a long time looking at that line.

Aug-16-10
Premium Chessgames Member
  Jimfromprovidence: Antonio, try out this puzzle. This is one of the most beautiful puzzles I have ever seen. It's from the August 15 LA Times, with white to play to win. Move 21.


click for larger view

The text solution is below, but beginning with move 23 for black, there is at least one deeper, more complex line to investigate than the one that was played.

[Event "SM 2010 Mästarklassen"]
[Site "Lund"]
[Date "2010.07.05"]
[Round "3.2"]
[White "Mårdell, Jimmy"]
[Black "Eklund, Joel"]
[Result "1-0"]
[ECO "B82"]
[WhiteElo "2151"]
[BlackElo "2192"]

1. e4 c5 2. Nf3 e6 3. Nc3 a6 4. d4 cxd4 5. Nxd4 Qc7 6. Bd3 Nf6 7. O-O d6 8. f4 b5 9. Kh1 Bb7 10. e5 dxe5 11. fxe5 Qxe5 12. Bf4 Qc5 13. Be3 Be7 14. Qd2 Qc7 15. Rae1 O-O 16. Bg5 Nbd7 17. Nf5 Bd8 18. Bf4 Qb6 19. Nd6 Bc6 20. Re3 Nd5 21. Bxh7 Kxh7 22. Rh3 Kg8 23. Bh6 Bf6 24. Rxf6 N7xf6 25. Bxg7 Ng4 26. Bf6 Nf2 27. Qxf2 Qxf2 28. Rh8 1-0

Aug-21-10
Premium Chessgames Member
  Patriot: Thanks for your reply.

In the commentary by Alekhine, I believe he was talking about the problem of relying on intuition without justifying it with tactics. "Look wide before you look deep" is something my coach told me, which could be a quote from Lasker...I'm not sure. But that's not about intuition. It is about efficiency in calculation.

For example, suppose you think candidate A looks promising and you analyze the move and all of it's critical variations and use 10 minutes only to decide there is very little gain. Then you see candidate B, which wins material in only a few moves and already shows promise of winning the game. The big problem is that you now have only a few minutes to play out the rest of the game. See the problem? If you had considered candidate B from the beginning then you would have ruled out candidate A early and saved a lot of time on the clock.

I'm probably telling you nothing new, but just want to be clear on the concept. This concept is especially important if you play in tournaments at G/30, like myself, where you must narrow down the candidates very quickly to decide what should be analyzed. Analyzing one candidate in-depth before moving on to another isn't practical.

Do you play OTB or online with a time control? If so, what time control?

Aug-31-10  CHESSTTCAMPS: <By the way, I'm about to export heat transfer technology to the States :-).> Great, so long as we use it to transfer heat away from the East Coast!
Sep-06-10
Premium Chessgames Member
  Patriot: Great job in the tournament!! Given the ratings of your opponents and the results, are you at least a master or IM? If not, surely your rating went way up.

It looks like we agree on just about everything. Our only disagreement seems to be on what needs to be analyzed and how far. However, I do enjoy reading your posts to see if I missed any critical candidates.

I looked at yesterday's problem (Sunday) for an entire hour, but didn't post anything. I only did it for practicing board vision. I analyzed the key line: 24.Qa8+ Kf7 25.fxe6+ Ke7 but did not see the move 26.Qg8 and so I went for 24.Qc6 as the best move. I noticed that after 24.Kxe3 Re1+ 25.Nxe1 fxe1/Q+ 26.Kd3 Qxe4+ 27.Kxe4 black looks to be winning. This position is similar to the other position we discussed because again there is an outside passed pawn that should determine the game. Fritz agrees but points out that 27...exf5+ is necessary first to reach a winning position.

There is a really nice tactics site I've been going to that you may be interested in, if you don't already go there. It is chesstempo.com. The really nice thing about this site is that you have time to analyze the position carefully before playing the best line. It also doesn't say you failed for finding a winning line that is not best. It tells you it is a good move but not the best and gives you another chance. This is good practice in analyzing slowly and carefully (helping board vision), and taking care to find the best line. Plus it uses the glicko rating system to give you a tactical rating. I started going to this site after I noticed that my rating on chess.emrald.net had reached a ceiling. Hopefully this site will help me get better board vision and analysis skill.

Sep-07-10  CHESSTTCAMPS: <The machine is finding his way to Ohio now and should be in our customer's lab by next friday, but it is not intended for air conditioning, sorry!>

OK, I'll get over my disappointment. How about tennis talent transfer as the next miracle?

Sep-08-10  CHESSTTCAMPS: Last night I watched a significant part of the Verdasco-Ferrer match from the U.S. Open on ESPN2. What terrific play - hard-hitting all-court fighting play from both players and one of the best match points I've ever seen. Too bad that these great Spanish players were packed into the same quarter of the draw and only one (the inevitable one) will come through. It's interesting that 5 years ago clay was still considered as a specialist's surface in the U.S. and now it seems that the great players need to play on clay to develop properly.

Coming back to chess, congratulations on your recent fine tournament result.

Sep-12-10  CHESSTTCAMPS: <Just send your tennis players to Spain. The problem is that they may decide not to return...>

It'a probably worth the risk - and a good life for those who get the chance!

Regardless of the fact that no U.S. men got into the quarter-finals, I'm still looking forward to the Men's final at the U.S. Open. The one-day delay for the final was unfortunate for the prospective TV viewing audience, but it will probably improve the quality of the final, given the extra day of rest for Djokovic after his semifinal thriller against Federer.

<Thank you, Phil. I have been invited to play in other two tournaments but I had to decline because I must work about 12 hours a day to deliver the next machines in time, and almost surely this will be my situation until next year :-( >

Getting invited to more tournaments is certainly a tribute to your level of play. I would guess that you'll get more tournament opportunities next year after your current professional obligations are done.

Sep-15-10  CHESSTTCAMPS: <Speaking about risk. If you know any youngsters who are planning to travel to Spain please keep slapping their faces while you state: DO NOT PLAY BALCONING. If they complain and say that they don't know what is that then hit them stronger (the good old 'multimedia' education).

http://www.guardian.co.uk/world/201...;

I had not heard the term "Balconing" before this. I might make light of it and nominate such idiots for the "Darwin Awards" were it not for the fact that they put innocents at risk, put the local medical services under stress, and generally make it unpleasant for the host country and those tourists who have some sense.

<... and the inevitable one won. >

And I was very happy with the high quality of the final - at least 6 rallies of 20 or more shots, hardhitting rallies. Going in, I knew that a rested Djokovic would be a worthy opponent (and taking a set from Nadal in top form is no small accomplishment), but I took the conventional view that Nadal's better physical conditioning would pay off in the end no matter what. In fact, the level of play was very high from both players, as measured by the fact that Nadal had only one unforced error in a final set that included a number of long rallies. Of course, Nadal had just too many weapons, especially with the new serve that had commentators comparing him with Sampras. The play that really amazed me was the shot in the final game where Nadal spinted from far right of the court behind the baseline to pick up an angled volley in the left service box - and hit a winner. This with two breaks of service in hand and a lead in the game, he goes for a shot that might injure an ankle, but there would be no compromise in his level of effort even with so much at stake.

The sportsmanship of both competitors in their postgame speeches was also noteworthy. Nadal extended his already substantial fan base in America and Djokovic won new fans as well.

I was not so happy with ESPN2 when they abruptly switched to Monday night football just after the trophy was handed to Nadal.

If Nadal continues to play and avoids serious injuries after age 25 (the period when Agassi won 2/3 of his majors), a number of tennis records will fall. If anyone can do the calendar year Grand Slam in this era, it would have to be Nadal. However, I can foresee a fascinating rivalry with del Potro as Federer fades from the scene.

<That's what I'm trying to explain to my club colleagues. They want me to play the region team championship but I'll have to decline once again.>

Too bad, but its nice to be wanted.

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