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posted by bigyellow on 2013-03-11 10:03:09

Hey guys, over the weekend I made a failry large update. Now, you can view games in algebraic notation. Just go to the profile tab, then the admin sub-tab and choose "algebraic notation" from the list of notation styles to choose from. When you look at your games, they'll be displayed in algebraic notation. Also, figurine algebraic notation displays correctly. Beforehand, I fudged things and it would show up as a "long figurine algebraic notation". Anyway, now it's correct. I'll talk a little bit more about why this notation style was more difficult to do than the others a little later.

Ok, you can now also download games in .pgn format. Just go to the "finished games" or "games in progress" sub-links from the home page link and view a game. Down at the bottom, you'll notice the link to download the game as a .pgn file. Now, you can load games in your favorite chess analyzer to figure out how to improve your game.

Finally, this is the puzzle

http://www.nothingbutchess.com/puzzle/?id=224

that I've promoted today on twitter, facebook and the like. Mate in 3, white to move. Check it out!

Back to algebraic notation. This is a little long and boring, so fair warning! Beleive it or not, showing moves in algebraic notation was MUCH more difficult than showing it in long algebraic or coordinate notation. Why? With the other two, it's understood that every move will be noted with a beginning and ending square. In long algebraic, for example Rd4-d5, would be the style. So it's the piece you want to move (R), it's beginning square (d4) and it's ending square (d5).

However, with Algebraic notation, you would note things as Rd5...most of the time! If there's another rook that could also make the move to d5, you have to then say Rde5 or "the rook on the "d" column to e5 or R4d5 (the rook on the fourth rank to d5 if the second rook is on the d column as well. Finally, in some rare instances, you have to say "Rd4e5" if there are two additional rooks that could make that move, one on the d column and one on the fourh rank.

Are you with me still? Ok, so in order to do this, I process the move to determine if it's legal. Then I put everything back to where it was. Then I check and see if another piece of the same type could make that move. So for example, if the user wants to move their rook, I check their other rook(s) and see if either of them could make that move. Any additional ones that can are noted. Then I put the pieces back again! Then, I actually process the move the user wanted to make! A little more work all for little old algebraic notation!

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