December 31, 2008
December 29, 2008
December 28, 2008
December 27, 2008
December 26, 2008
December 24, 2008
December 22, 2008
It seems obvious that illegal moves are just that (illegal) and we shouldn’t worry about them.
For example, the PGN specification (section 8.2) is very clear saying:
In other words an illegal move is not permitted at all and can invalidate the whole PGN. I’m not going to question what the PGN specification found impossible to solve. They stayed focused on chess and they did a pretty good job doing it.
Unfortunately, there are examples of actual games where illegal moves were played. One of those was pointed out by MostlyAverageJoe (on chessgames.com):
Wolfgang Heidenfeld vs. Kerin
(Note: As of 21-Oct-2009 the link doesn’t work anymore and the game is not available at CG.com – most probably deleted!)
The funny problem is that in this game white castled twice. White’s move 33.0-0-0 is illegal and any PGN complaint viewer will either ignore it or (much better) show it as illegal.
Fortunately, in this particular case PGN allows an elegant workaround as follows. I moved out the illegal section of the game into its own game (“Part: II”). It shows all the moves starting at white’s 33.0-0-0 and we can enjoy the rest of the game the way it was actually played.
UPDATE: A very recent example of handling a similar situation in an official tournament is the following game. I’m glad my understanding above is in unison with the way the game is presented in the provided PGN and on the official site (using ChessTheatre software).
December 20, 2008
December 19, 2008
December 18, 2008
Notice that both players have ratings above 2800 mark. Kasparov’s 2838 is impressive even in today’s “money” and he is not too far from his peak of 2851 which he had the previous year (during Corus 2000).Here is something else you might find interesting. According to my engine the move 49… Bg3+, which Kasparov played, is “mate is 7”. Usually in such positions GMs resign saving themselves the embarrassment. Why was Mr. Kramnik playing on? I don’t think he was hoping for a miracle. Can we assume that he also missed the mate?
Originally posted by SusanPolgar here: Are you smarter than a WC?
December 17, 2008
December 16, 2008
December 15, 2008
December 12, 2008
December 11, 2008
The above was originally posted by Admin here: Thursday morning chess tactic
Sure, Mr. Rodshtein (white) didn’t miss the mate and his opponent (Mr. Caspi) resigned after Rxg8+. Two moves earlier in the game though, in the following position, a very nice tactics could've been played.
Can you find it?
December 10, 2008
This was originally posted by Chess Teacher here: Some traps in the Sicilian game. (In a recent update, dated April 2010, the author prepended an unfortunate note starting with “The method stopped working and the post has been replaced by some images …”.)
I’m re-posting it as a comparison of different publishing methods. I hope to get some feedback about the advantages and disadvantages of each approach from the end-user‘s point of view. For example, how easy and intuitive can we navigate through variations?
December 7, 2008
December 5, 2008
December 3, 2008
December 2, 2008
- Dark squares have a different color;
- Second game is pre-selected;
- The viewer is enclosed in a bordered box;
Here is the modified CV section of the post body that is producing these results:
Below are the actual changes along with some explanations and internal processing details:
- The way new parameters are submitted to the Chess Viewer Deluxe applet. Proper values are assigned to two of them (“DarkSquares“ and “GameToSelect“) which are passed in when the “makeChessApplet” function is called. The most common parameters are handled nicely by the “HTML generator” so you don’t have to do it manually (but you could). For a complete list of all possible parameters check the CVD’s home page.
- There is a mandatory ID of “oChessViewer” defined on the SCRIPT element. The ID is later inherited by the chess viewer (CV) object. That's quite convenient and can be used in your CSS (as I do in mine) to define a style that applies to each of the CV objects.
- There is an optional “style” attribute defined on the SCRIPT element which also gets inherited by the CV object. The example makes good use of it to overwrite the current settings for margins (from the CSS).
- The outer box is defined in the most usual HTML fashion and shows how easy the CV object is nested inside it. In fact, the CV object literally replaces the SCRIPT element and, from user’s point of view, the PGN data is naturally inherited by it.