Friday, 21 November 2014

Using Analyze This' Instant-position analysis from your Android Chess App

You can use the Instant-position analysis feature of Analyze This from your own Chess App! All you need to do is invoke Analyze This and pass additional Intent extras.

1. Instant-position analysis for current position only
You can send the FEN string of the current position for Instant-position analysis. Note that only the FEN string is sent and not the whole PGN. So users would need to return back to your App in case they wish to analyze some other position.

public static final String PKG_ANALYZE_THIS_FREE = "com.pereira.analysis";
public static final String PKG_ANALYZE_THIS_PAID = "com.pereira.analysis.paid";
public static final String ANALYZE_THIS_ACTIVITY = "com.pereira.analysis.ui.BoardActivity";
public static final String KEY_FEN = "KEY_FEN";

//Since users may have either the Free or the Paid version of Analyze This, you should check using Package Manager

analyzeThisPackageName = PKG_ANALYZE_THIS_FREE; //default to free version, but check below if paid version is installed
if (isInstalled(this, 
    //paid version is installed, so use it!
analyzeThisPackageName = PKG_ANALYZE_THIS_PAID;

Intent intent = new Intent();
//set the FEN extra
intent.putExtra(KEY_FEN, fen); //send the "fen" string from your program
//set the component
ComponentName name = new ComponentName(analyzeThisPackageName, ANALYZE_THIS_ACTIVITY);

try {
    } catch (ActivityNotFoundException e) {
    //TODO neither Free nor Paid version of Analyze This is installed, so show message to the user to install the App from the Play store

//Method to check if the given package is installed on the device
public static boolean isInstalled(Context context, String packageName) {
    boolean installed = true;
    try {
        PackageInfo pinfo = context.getPackageManager().getPackageInfo(
        packageName, 0);
        } catch ( e) {
        installed = false;
    return installed;

2. Instant-position analysis with whole PGN
You can also send the whole PGN game to Analyze This and have it immediately start analyzing the position at a given ply number: (new addition in Analyze This v3.1.4). The added advantage of sending the whole PGN text is that users can also move back and forth through the game without having to return back to your App.

public static final String KEY_PLY_NUM = "KEY_PLY_NUM";

Intent shareIntent = new Intent(android.content.Intent.ACTION_SEND);
intent.putExtra(android.content.Intent.EXTRA_TEXT, pgn); //complete pgn text
ComponentName name = new ComponentName(analyzeThisPackageName, 
ANALYZE_THIS_ACTIVITY);intent.putExtra(KEY_PLY_NUM, plyNum); //plyNum (half-move) at which to start analyzing


try {
    } catch (ActivityNotFoundException e) {
    //TODO neither Free nor Paid version of Analyze This is installed, so show message to the user to install the App from the Play store

You can even ask Analyze This to flip the board or choose a different board color which suits your application's board color.
intent.putExtra("KEY_COLOR", 0); //Integer value, where 0="Aqua", 1="Blue", 2="Brown", 3="Gray", 4="Green", 5="Fritz", 6="Sky Blue"
intent.putExtra("KEY_FLIPPED", true); //boolean value, where true = turn the board and show white on top, false = do not turn the board

Tuesday, 7 October 2014

My Chess Apps has a new Google Forum!

Dear Friends,

You now have a single place to discuss everything about my Chess apps!!members/my-chess-apps

Join the Google forum group and discuss features, suggestions, bugs and stuff with like-minded Chess enthusiasts!

Tuesday, 30 September 2014

Analyze This - Understanding the Chess Engine

What is Critter, Stockfish?

Critter & Stockfish are the Top free Chess engines (aka mini Computers) that come pre-installed with Analyze This.
They are like the commercial engines Fritz, Houdini albeit free.
As of May 2013, Critter has an estimated ELO strength of 3175 while Stockfish is rated at 3164! (Carlsen is 2868!)
Newer versions of Critter and Stockfish can be downloaded from their respective sites:

What are the three buttons next to the Engine?

Start or stop the engine.

Increase the number of "lines" that the engine shows. By default, the engine only shows the first best move it has calculated. You can press "+" to ask the engine to show the 2nd, 3rd etc "best" moves. 1st move is always the best move. More engine lines mean that the engine has to use lot of CPU power and also spend equal time analyzing the other "best" moves that it considers. The quality can degrade with too many lines.

Decrease the number of lines. Lesser the lines, the efficient is the engine.

What do those numbers and symbols shown by the Engine mean?

+/= (=/+)
Slight advantage: White (Black) has slightly better chances.

+/− (−/+)
Advantage: White (Black) has much better chances. It is also written as ± for White advantage, ∓ for
Black advantage; the other similar symbols can be written in this style as well.

+− (−+)
Decisive advantage: White (Black) has a clear advantage.

(6.31) Centi pawn evaluation
The engine considers the position to be equal to 6.31 pawns (winning). Negative value means the position is losing for that side by those many pawns.
In other words, the evaluation of the position in terms of pawns (where pawn = 1pt)

d=16 (Engine depth)
The half-moves that the engine is currently thinking ahead. Typically means that the engine is thinking 8 moves ahead (8 for White, 8 for Black). As you give more time for the engine to chew on that position, the depth will keep increasing gradually.

For more details, please visit

NOTE: Running more engines simultaneously or with multiple lines can severely drain device battery.

Sunday, 24 August 2014

What's new in Follow Chess App!?

In the month of August, Follow Chess App got few nice updates:

All Games | Tournament Standings | Follow your country-men!
Tap on the arrow at the right, to see these hidden goodies!

Missed games from the earlier rounds? No problem! You can check out All Games from previous rounds too!
PS. Pro users can view ALL these games. Free users can view only some of them.
View tournament standings after every round!

Follow Chess makes it easy to follow games and progress of your country-men. Simply set your country and Follow Chess will highlight their Standings. Also their live games will be shown at the very top for quick access!
(You may have been asked to choose your country the very first time you launched the App. Or you can set it from the Settings too!)

As promised, more goodies are coming!!

DOWNLOAD : Follow Chess App

Wednesday, 16 July 2014

Your Move App updated - now make your move on ChessOK and mychess!

What's new in Your Move 1.2.1


* Added support for and ChessOk correspondence servers

* Multiple Logins - Now you can login to your ICCF, Scheming Mind, ChessOK & accounts, all on a single device, using a single App!

* [PRO] Export the game (ongoing or finished) via Email/FB/Twitter or send it to other Chess Apps installed on your device

* Minor enhancements and bug fixes

Wednesday, 18 June 2014

[Android] iChess v3.6.1 released!

iChess v3.6.1 was released today with the following changes:

* You can now reset the Bird view and start solving afresh! (See Bird View screen - Menu - Reset). This will not affect your score

* If your puzzles PGN has a comment, then iChess will show it underneath the board.

* Better Fritz color
* Better support for foreign language PGNs
* Fixed some puzzles
* Other enhancements under the hood!

Tuesday, 27 May 2014

Whats New in Chess Book Study v2.5! [Android]

v2.5 of Chess Book Study Android app was released today! [FREE / PRO]

Chess Book Study Store!
Chessdom Chess Insider PDFs/PGNs are now available for purchase from inside the App!
Read GM Analysis and reports of the historic Candidates 2014, European Individual Chp or the Gashimov Memorial. More coming soon...
You can even copy the PDF/PGN and view them on your Computer!*
(Please upgrade Ebookdroid (Chess) app to see the extra Menu option. Else use the Quick Action menu > Store)

Annotation Editor
You can effortlessly add annotations and comments to multiples moves from a single screen!


  • Board Colors - You can choose different Board colors. What more, the board/app background changes according to the chosen color!
  • Sound - Enable/disable sound

Promote Variation
In the Notation view, tap an already selected move or touch and hold to see more options, including the Promote Variation option.

Bug fixes and Misc changes
This release also includes some bug fixes and PGN library changes.

Play Store Links

* The files are stored on your sdcard. (/sdcard/Android/data/com.pereira.booknboard{.paid}/files/)