Chess.com - Play. Learn. Share. Online chess community where you can play chess, learn strategies and tactics, read chess news, see book reviews, find rules & tips, get free downloads, and more! http://www.chess.com/ 2007 Chess.com The Elo rating system is seriously flawedA two dimensional measure of chess performance is presented and it is shown to have more information and a greater power of discrimination than scalar measures because it does not rely on scoring. The scoring procedure used by scalar measures to r...http://www.chess.com/blog/Jamalov/the-elo-rating-system-is-seriously-flawedThu, 28 Aug 2014 14:52:35 -0700http://www.chess.com/blog/Jamalov/the-elo-rating-system-is-seriously-flawedThe relative playing strength of chess playersThe conventional method of rating chess players uses a procedure called "scoring" to reduce a trinomial process to a binomial making it possible to rate chess playing strength with a single scalar measure. This simplicity is achieved at a cost bec...http://www.chess.com/blog/Jamalov/the-relative-playing-strength-of-chess-playersMon, 11 Aug 2014 18:59:01 -0700http://www.chess.com/blog/Jamalov/the-relative-playing-strength-of-chess-playersPairwise comparison of chess opening variationsSUMMARY: Pairwise comparisons show that there is no difference between the B70 Sicilian Defense/Dragon Variation and the B90 Sicilian Defense/Najdorf Variation in terms of the probability vector. The data are consistent with our null hypothesis t...http://www.chess.com/blog/Jamalov/pairwise-comparison-of-chess-opening-variationsWed, 30 Jul 2014 08:44:41 -0700http://www.chess.com/blog/Jamalov/pairwise-comparison-of-chess-opening-variationsCornered knightThe corner knight cannot escape once the king moves to the position shown. Something to think about if your tactic or strategy involves a knight in the corner.   http://www.chess.com/blog/Jamalov/cornered-knightWed, 20 Mar 2013 19:28:38 -0700http://www.chess.com/blog/Jamalov/cornered-knightThe value of opening linesDo some opening lines favor white and others black? Or are they optimized to maintain a neutral position? To answer this question I selected 190 commonly played opening lines (out of thousands) from the "opening theory" book available online at wi...http://www.chess.com/blog/Jamalov/the-value-of-opening-linesSun, 17 Mar 2013 04:47:44 -0700http://www.chess.com/blog/Jamalov/the-value-of-opening-linesA comparison of the A00 Irregular Openings     The data for the discussion below appears in a pdf file that I uploaded to a pdf hosting site.The pdf document was created from an Excel spreadsheeet. It lists the Irregular Openings twice. On page 1 they are listed in conventional seque...http://www.chess.com/blog/Jamalov/comparison-of-the-a00-irregular-openingsFri, 08 Mar 2013 01:26:23 -0800http://www.chess.com/blog/Jamalov/comparison-of-the-a00-irregular-openingsBlack's defense against 1. e4 I looked at eight different responses to 1. e4 listed in chess opening theory. They are c5, d5, e5, c6, d6, e6, g6, and Nf6. For each response I played out 10 mainline opening moves and then compared the relative advantage gained by black in eac...http://www.chess.com/blog/Jamalov/blacks-defense-against-1-e4Tue, 26 Feb 2013 09:18:57 -0800http://www.chess.com/blog/Jamalov/blacks-defense-against-1-e4Albert Einstein   As this blunderfest should make it very clear, just because a guy came up with the theory of relativity (to which he was led by Maxwell's equations) does not mean he was a good chess player nor that he was a general purpose all knowing wise ...http://www.chess.com/blog/Jamalov/albert-einsteinSat, 23 Feb 2013 00:51:28 -0800http://www.chess.com/blog/Jamalov/albert-einsteinRetirement The things that occupy my life these days are mostly things I never did before I retired. Take for example chess, golf, the guitar, living in Thailand, traveling around in SE Asia, learning different cultural practices and different languages. I...http://www.chess.com/blog/Jamalov/retirementFri, 22 Feb 2013 07:10:00 -0800http://www.chess.com/blog/Jamalov/retirementHow to use an engine in your online game legallyI could not get this thing to format correctly in this editor and so I am posting a link to a pdf file. Hope to get some feedback.  http://freepdfhosting.com/fd92018e62.pdf   Cha-am Jamal Thailand http://www.chess.com/blog/Jamalov/how-to-use-an-engine-in-your-online-game-legallyTue, 19 Feb 2013 01:37:20 -0800http://www.chess.com/blog/Jamalov/how-to-use-an-engine-in-your-online-game-legallyOpenings in the Carlsen gamesI created a composite Carlsen game from 1508 of his games and found that although Carlsen has a repuation for playing unusual openings if you take a close look at all his games played so far you get a very different picture.  The most popular fi...http://www.chess.com/blog/Jamalov/openings-in-carlsen-gamesTue, 12 Feb 2013 19:11:39 -0800http://www.chess.com/blog/Jamalov/openings-in-carlsen-gamesA burning questionIn rural Thailand many people throw their trash in a convenient corner of the yard and when the heap gets too large or smelly they rake it up into a pile and light a fire. A plume of smoke billows up from that house and depending on wind condition...http://www.chess.com/blog/Jamalov/a-burning-question2Mon, 04 Feb 2013 23:02:50 -0800http://www.chess.com/blog/Jamalov/a-burning-question2Zadar, Zadar, ZadarTiger Lilov's video about the Zadar Open 2012 motivated me to look at the relevant data in some detail. The issue involves a non-grandmaster player (NGM) who played against grandmasters (GM) with such surprising strength that many people wondered ...http://www.chess.com/blog/Jamalov/zadar-zadar-zadarWed, 30 Jan 2013 07:35:05 -0800http://www.chess.com/blog/Jamalov/zadar-zadar-zadarHey! Add me to your friend list so we can stay in touch...Some of the language on this website is a little too casual. For example the friend request text is the way you would talk to someone you already knew very well and not the way you would talk to someone you just met online and would like to includ...http://www.chess.com/blog/Jamalov/hey-add-me-to-your-friend-list-so-we-can-stay-in-touchFri, 25 Jan 2013 05:20:39 -0800http://www.chess.com/blog/Jamalov/hey-add-me-to-your-friend-list-so-we-can-stay-in-touchDynamic game formatsHere is something that happens a lot. In the middle of a 3-day OTB game the opponents find that they are both online and they begin to play the OTB in the same way they would a live game except that the communication of the move information is ver...http://www.chess.com/blog/Jamalov/dynamic-game-formatsThu, 24 Jan 2013 06:37:59 -0800http://www.chess.com/blog/Jamalov/dynamic-game-formatsThe joys of retirementI am over 65 and retired and took up chess as a retirement activity. I thought it would be fun to connect with other seniors here and to form our own little community. So I formed a group for people over the age of 65. It is called "Seniors Chess"...http://www.chess.com/blog/Jamalov/the-joys-of-retirementTue, 22 Jan 2013 02:07:07 -0800http://www.chess.com/blog/Jamalov/the-joys-of-retirementGrandmaster in the broom closetMy friend Chris who used to play on his company's chess team about thirty years ago in London says that one day the janitor, a wisened old man, said something about having been a Russian grandmaster. Unfortunately for the company chess team no one...http://www.chess.com/blog/Jamalov/grandmaster-in-the-broom-closetMon, 07 Jan 2013 22:54:06 -0800http://www.chess.com/blog/Jamalov/grandmaster-in-the-broom-closetToo slow for tactics trainerI guess I am too slow for the tactics trainer. Is this kind of speed really that important in chess? What's the big hurry?  http://www.chess.com/blog/Jamalov/too-slow-for-tactics-trainerMon, 31 Dec 2012 06:16:21 -0800http://www.chess.com/blog/Jamalov/too-slow-for-tactics-trainerThe Death OpeningChess.com member Daeth says that he has invented a new opening that ends with 6. g4 (there are alternative lines to 6. g4 but only the mainline is shown below). I tried it out and it works against the engines. After 6. g4 white is ahead and no mat...http://www.chess.com/blog/Jamalov/the-death-openingThu, 27 Dec 2012 18:50:38 -0800http://www.chess.com/blog/Jamalov/the-death-openingJose Raul CapablancaHere he is, age 4, playing his first chess game with his father in which he won. The only guy in the history of the game to have won his first game. Or so the legend goes. http://www.chess.com/blog/Jamalov/jose-raul-capablancaMon, 17 Dec 2012 20:16:45 -0800http://www.chess.com/blog/Jamalov/jose-raul-capablanca