About Apronus.com Online Chess Publishing Project

online interactive chessboard with PGN viewer and editor, diagram editor and puzzle editor
set up any position to play against computer or analyze with a chess engine
make diagrams with arrows and selected squares or animations indicating moves with arrows
create links to your chess positions or embed chessboards on your own pages
design chess puzzles:
- the computer replies even if the user goes wrong
- the computer tries multiple defenses before admitting success
- the user is allowed a choice of alternative solutions

Interactive Chessboards Manifesto

Every chess diagram on the Internet should be interactive in the following ways:

One can generate the FEN of the position that is shown on the diagram.
One can generate the PGN of the game fragment of an animated diagram.
One can easily start an interface that allows making moves on the chessboard to study the position by analysis.
One can easily start an interface for playing the position against computer from both sides.
Play against computer should allow the user to make all the moves by oneself and force the computer to move at any moment.
The positions and game lines that are played out in the two points above should satisfy the first points of always being able to generate the FEN and PGN.
The board can be flipped at any moment so that there is always the choice between having White or Black at the bottom.

The Apronus.com chess service implements this vision. Additionally, you can make static and animated diagrams as images for posting in your blog or website. Chess authors can participate in this vision by placing links to Apronus.com pages with the chess content encoded in the links. For example, you can wrap the <a> HTML tag around any image of a chess position and put a link into href that encodes the position and directs the user to play against computer at Apronus.com. The interfaces here provide ready-made HTML code to embed in your pages.

Chess at Apronus.com is free for non-commercial amateur use only.

(old) PGN Viewer and Editor

Puzzle Editor

Chess Puzzle Editor

Header

Describe the task

Type of experience:

skip solved moves
prepare for exam mode
allow engine help

self-play
play computer (no solution, no criterion)
puzzle (solution or criterion)

selfplay

user plays both sides:

move limit (0 — no limit)

puzzle success criterion:
win
draw
stalemate
destroy
survive
solution

wrong move alert
find all alternatives
display solution
show me button

Header preview:

White to play.

puzzle auto header:

edit header manually

task to perform:

source or comment:

link to source:

task top bottom

use custom HTML code

Puzzle Header Editor (HTML code):

General Board Options

language:

If you specify the language (English, Russian, Polish) the interactive chessboard will react in this language overriding any user settings. Currently, the 'auto' option defaults to English but in the future it may try to detect the preferred user language or consult user settings.

Time per move for the computer in milliseconds: ms

We use a JavaScript chess engine running in the user's browser. The strengh of the engine depends on the hardware. By default, it is configured to think for 1 second per move (1000 milliseconds). This setting is used for making engine replies to wrong moves not included in the author's intended solution for interactive puzzles. But even if the computer replies with a ready-made move supplied by the author of the puzzle it will pause for the same period of time.

Relax end-of-game result sensitivity:

By default the board interface reports the end-of-game result and no more moves are made on the chessboard. However, for teaching purposes you might want to let users go on making moves even when insufficient material is reached or past the fifty moves rule. This checkbox prevents the interface from displaying end-of-game results. It freezes the chessboard only after checkmate.

Play blindfold on an empty board: or enter which pieces should be invisible:, e.g. KQRBNPkqrbnp.

Nullmoves The engine makes a move only when checked or threatened with mate in one.

Exceptions: The engine will make a move after the user makes a capture. The engine will make a capturing move if it thinks it's the best move.

Variations Editor

Enter the solution line by playing it out on the chessboard and click to keep it.
Enter more lines to allow multiple defenses.
Enter more lines to allow alternative solutions.
For each line played on the board click to add it to the solution lines.
Alternatively, use to absorb the starting position and the solution lines from your favorite chessboard editor.
For mate in 1,2,3,4 puzzles you may use the automatic mate search

which returns the complete mate-in-N solution.
In any case, you can already entered lines or write these lines from scratch as text.

Keep an eye on the FEN

or have the reply to your moves .

ILLEGAL MOVES

Preview

The preview below is resizable: drag the bottom right corner.

Set up position or import FEN or PGN

Hold

Use click-click (drag and drop is not supported)

White	O-O	O-O-O

Black	O-O	O-O-O

Set up position or enter FEN above or .

Share | Export | Save

Link to share:

Export to WordPress:

bookmark to save your work

play this position against computer

Chess at Apronus.com is free for non-commercial amateur use only.

Diagram Image

Download or copy this static diagram PNG image or open it in

to change colors, add arrows or selected squares, or to write text above and below the board.

Download or copy this animated GIF image.

current line list of lines

arrows coordinates

delay: (100 = one second)

show diagram in new window to save manually
show diagram in new window to copy the link from there
direct download by the browser

Chess at Apronus.com is free for non-commercial amateur use only.

HTML code to embed in your own page — with PGN to recreate the chess content

Chess at Apronus.com is free for non-commercial amateur use only.

HTML code to embed in your own page — with PGN to recreate the chess content

Chess at Apronus.com is free for non-commercial amateur use only.

If this URL is too long, click to obtain a short one instead.

Chess at Apronus.com is free for non-commercial amateur use only.

Preview of embedded puzzle

Chess at Apronus.com is free for non-commercial amateur use only.

Import PGN

Paste your PGN file below and click .

Alternatively, you can upload PGN file .

Chess at Apronus.com is free for non-commercial amateur use only.

About Apronus.com Online Chess Publishing Project

Interactive Chessboards Manifesto

Chess Puzzle Editor

Header

Describe the task

Type of experience:

Header preview:

White to play.

General Board Options

Variations Editor user guideline

Preview

Set up position or import FEN or PGN

Share | Export | Save

Diagram Image

Import PGN

Variations Editor