main whatisnew download strength features shots subscribe reviews FAQ price list phonelistemail list how to order aegon bench database util epd2diagramj. noomen column DIAZ column misc. older topics comp. profile cartoon mode REBEL CENTURY is the successor of REBEL 10. It marks the end of an era: it is a last farewell to DOS. Future REBEL's will only run on Windows 95/98/NT platforms.

Rebel company has been very keen to make this product very special with lots of extra data and utilities and also a prize contest of in total $2000,- is part of REBEL CENTURY.

The main improvements are based on making the engine stronger, more attractive but most of all more flexible.

It's our understanding that today's chess programs are so incredible strong that more and more people are using a chess program in another way than 3-4 years ago. The Chess 2010 Opinion Poll confirmed our feelings about this topic.

REBEL CENTURY What's New in the GUI?

  • Full Logfile support by one simple mouse click. For an example click HERE. The Logfile has 3 options:

    • Write analysis to the logfile of the current position (default setting).

    • Write all analysis to the logfile of the current session (using append). This may result in a very tall logfile, on the other hand every action is recorded. The logfile is overwritten every time you start REBEL.

    • Write all analysis to the logfile of the current session (using append). This function keeps ALL logfiles. Logfiles are simply numbered by date and an extension number. Examples: 99-05-22.001 , 99-05-22.002, 99-05-23.001 and so on.

    • You can switch between these options using the direct keyboard shortcuts SHIFT-F6 and SHIFT-F7

  • Option Club Player. REBEL so now and then deliberately will make a mistake. The range of mistakes can vary from minor positional mistakes to a material loss of 2 pawns.

  • Option Analyze game extended. If moves are marked with "??" (using the annotation symbol shortcut) REBEL will analyze those moves only. This will shorten the analyze process tremendously.

  • The new function is also supported for multiple game analysis if you have marked multiple games in the database.

    The new main variation

    • Main Variation extended from 7 to 24 plies.

    • Main Variation now in short and long notation depending on your preferred setting.

    • Using the setting INFO=SUPER (menu CONFIG) will store the main variation in the TEACHER WINDOW too to ensure the complete main variation (max. 24 plies) is shown in a good looking way. Click HERE to view.
  • The ELO level (set REBEL to your own strength) is further improved. Rebel now will limit its opening book if you set Rebel's elo to 2200 or below.

  • REBEL CENTURY What's New in the BOOK?

    The new Jeroen Noomen book has been extended with another hand-typed 130 Kb (is 65,000 new moves) to update the REBEL10 book concerning the latest new opening theory.

    One of the main advantages of the standard REBEL book is that it contains a lot grandmaster analysis on critical positions of human theory.

    REBEL will play these grandmaster analysis too and therefore REBEL is even able to surprise the most experienced GM experts in opening theory since most of these lines are not tried in GM tournaments.

    The best of REBEL GOLD

    Especially for REBEL CENTURY a compilation of the best of Rebel GOLD has been made. These (mainly hand-typed) opening books are now combined in one big opening of over 3 Mb in size.

    To access this giant book you need to have at least a PC of 200 Mhz to get acceptable response times. Statisctics:
    • Unique opening lines : 96,315
    • Total moves : 1,588,812
    • Total positions : 6,409,562
    • Average length : 17 moves (34 plies)
    Number of unique opening lines of the main important openings Caro-Kann 2,415 English 5,189 French defence 18,397 King's Indian defence 1,598 Nimzo-Indian defence 1,451 Petrov defence 2,128 Queen's Gambit 6,761 Reti System 2,296 Ruy Lopez 13,479 Sicilian defence 23,868 Slav defence 3,715
    Loacation on the cdrom: GOLD

    REBEL CENTURY What's New in the EOC?

  • The EOC-USE settings ACTIVE and STRONG are improved and are now much more intelligent than the ones of REBEL10. The gained EOC bonus score is displayed in the logfile for each main-variation so you can exactly see to what intend the EOC database has guided REBEL to its moves played.

  • The EOC-USE setting BOOK is improved too. It's quite safe now to use the whole EOC database as one big book without loss of too much strength. The latter because a book plays moves at random due for reasons of variety.

  • The new big EOC database

  • A brand-new Encyclopedia of Chess database is created based on over 500,000 high quality games.

  • In total over 120 Mb.

  • During installation you will be prompted to install the big EOC database to your hard-disk or leave it on cdrom. If you leave the big EOC database on cdrom and want to access the big EOC database then use "Load Encyclopedia" (menu DATA) and browse to the directory EOCBIG to select the new big EOC database.

  • Extra EOC databases

  • From the 40 world most known chess players the opening repertoire is available. You now can study the opening repertoire from Paul Morphy all the way to Garry Kasparov. The complete list:
      Alekhine, Botvinnik, Capablanca, Chigorin, Euwe, Keres, Lasker, Marshall, Mieses, Morphy, Nimzowitch, Reti, Rubenstein, Tarrasch, Tartakower, Bronstein, Gelfand, Ivanchuck, Kamsky, Karpov, Kortchnoi, Kramnik, Leko, Petrosian, Piket, Polgar,Judith, Portisch, Salov, Shirov, Smyslov, Sokolov, Spassky, Steinitz, Svidler, Tal, Topalov, Anand, Fischer, Kasparov,Timman.
  • In total 150 Mb (!!)

  • If you want to access the extra EOC databases then use "Load Encyclopedia" (menu DATA) and browse to the directory EOCEXTRA on the REBEL CENTURY cdrom to select these player EOC databases.

  • REBEL CENTURY What's New in the DATABASE?

    REBEL-BASE is extended with 200,000 games. REBEL-BASE has now 510,000 high quality games. REBEL-BASE is 3 years old now and over 2000 hours of man power has been invested invested in this database. REBEL-BASE is fully name and tournament consistent.

    If you have Internet access and subscribe to REBEL CENTURY you get access to the REBEL SUBSCRIPTION AREA where you can download the latest GM/IM games to keep REBEL-BASE up-to-date. As an extra REBEL-BASE is also available in the popular CBF and CBH format.

    REBEL CENTURY and playing strength

    During the 9th World Chess Computer Chess Championship (June '99) REBEL CENTURY played 3 blitz games against DEEP BLUE JUNIOR. Deep Blue Junior was connected to the Internet in the hall of the museum near to the tournament hall of the 9th WCCC.

    You can play any time control and Deep Blue Jr. was set to 5 minutes blitz and Rebel Century to 10 minutes blitz. Rebel Century played on a laptop of 333 Mhz. In the end it showed up Deep Blue Jr. used about the same amount of time as Rebel for the games.

    Rebel Century out-played Deep Blue Jr. very easily and it was a shocking surprise to see that Rebel Century beat the monster on his own specialty namely tactics where the opposite was expected as the Deep Blue Jr hardware runs at 20 million positions a second while Rebel Century on a 333 Mhz Pc only can search 100,000 positions a second.

    Click HERE for a detailed analysis and download of the 3 games (including diagrams and annotations).

    Much later (October 1999) Feng-Hsiung Hsu and Murray Campbell authors of Deep Blue made a public statement saying a weak version of DEEP BLUE JUNIOR played during the 9th WCCC. Click HERE to read the Hsu/Campbell statement.

    REBEL CENTURY against the World's strongest chess programs   

    The below matches are played on a level of 60 seconds average on Pentium-II 266 Mhz and Pentium-II 450 Mhz machines using the Auto Player software AUTO232 of Dr. Christian Donninger (author of Nimzo) against the strongest chess programs in the world.

    Match LEVEL 1:00 Status
    Rebel Century - Nimzo 98 35.0 - 34.0 Finished
    Rebel Century - Shredder 2.0 33.5 - 22.5 Finished
    Rebel Century - Hiarcs 7.0 31.0 - 32.0 Finished
    Rebel Century - Fritz 5.32 26.0 - 16.0 Finished
    Rebel Century - Junior 5.0 28.0 - 19.0 Finished
    Rebel Century - Shredder 3.0 41.5 - 29.5 Finished
    Rebel Century - Crafty 16.13 29.5 - 15.5 Finished
    Rebel Century (total) 224.5 - 168.5 (393 games) (57%)

  • Download Rebel Century's 393 comp-comp games in REBEL format (40 Kb)

  • Download Rebel Century's 393 comp-comp games in PGN format (120 kb)

  • REBEL CENTURY What's New in the ENGINE?

    Starting point of the engine is the more positional based Rebel10.0b keeping the good things of Rebel10.0c. Various positional changes have been made to make REBEL a better positional player and analyze partner.

    The engine is now fully flexible and user configurable. It's expected REBEL (and the user) will profit a lot from that.

    You can now tune REBEL CENTURY in 3 different ways:
    • Tune the most important positional values of Rebel (range 1-500).
    • Tune the material values of Rebel (range 1-500).
    • Tune the search and/or extensions.
    All of this is done by a simple ENGINE text-file (kind of INI file) which you can modify to your own wishes. Have a look at REBEL CENTURY default ENGINE.

    All you have to do is to change the scale (range) values. All default settings for REBEL CENTURY are 100. By modifying these 100 values you can increase or decrease the specific chess knowledge in REBEL CENTURY.

    To modify (or create new) engines (or personalities) you can use Rebel's build-in personality editor or use a special stand-alone program. Click on the pictures to view them in real size.

    The SEARCH options in more detail as we assume the rest of the ENGINE file is self-explaining:

    • Overnight Search is very useful for correspondence players or for people who often use a chess program for long analysis up to 24 hours or more. The problem with most chess programs (previous REBEL's included) is that after some time (15-20 minutes) the search kind of blocks and becomes slow as a snail due to a full hash table. The result is that a new main-variation can take ages.

      Overnight Search solves this problem and you may expect better results in the end. Overnight Search will limit several extensions to reasonable margins as Overnight Search assumes that tactics (if present) will be found anyway. As a result Overnight Search typically searches 3-4 plies deeper while you are sleeping. Also the hash table use by the program is tuned for this option.

    • Risky Search typically will speed-up the search with 15-20%. Risky Search takes a bit more risk than the default search and is almost without any negative side effect. You can safely set REBEL CENTURY to this value.

    • Deep Search will look for deep tactics. REBEL CENTURY most of the time will find a combination 1 ply sooner.

    • Deeper Search will look for deeper tactics. REBEL CENTURY most of the time will find a combination 2 plies sooner.

    • Deepest Search will look for even more deep tactics. REBEL CENTURY most of the time will find a combination 2-3 plies sooner.

    REBEL CENTURY engine personalities

    Multiple ENGINE files (see above) can be created and loaded. These files are called PERSONALITIES. Within REBEL CENTURY 10 personalities are pre-programmed. From the menu OPTIONS you load the following personalities:
    • Garry Kasparov
    • Robert Fischer
    • Michael Tal
    • Anatoly Karpov
    • Vishy Anand
    • Judith Polgar
    • Strong Club Player
    • Average Club Player
    • Novice Player
    • Rebel Century
    We will add some examples (including diagrams) later to prove it is possible to addapt the playing style of these great chess players with REBEL CENTURY new engine concept.


    Every chess program is released with its "default settings" which according to the programmer are the best settings he is aware off. But are these "default settings" really the strongest ones? This is unlikely as chess (and programming chess) is much too complicated to say that for sure!

    The more likely truth is that there are maybe easy elo gains the programmer isn't aware off. The "Pilz" settings of Chessmaster are famous for that.

    REBEL CENTURY's new "flexible engine concept" allows easy and powerful tweaks (tuning) of the engine by the user and it is expected to get an elo improvement of 30-50 points by finding REBEL's ideal default settings.

    The challenge for you the end-user is to find REBEL's ideal default settings!
    CATEGORY I (playing games)
    • $1000 for the best improvement based on 40/40 games (category 1a)
    • $400 for the second best improvement based on 40/40 games (category 1a)
    • $250 for the best blitz improvement based on 10/all games (category 1b)
    CATEGORY II (testing positions)
    • $200 for the best tactical improvement (a key testset is provided)
    • $100 for the second best tactical improvement.
    • $50 for the third best tactical improvement.
    Thus if you are really good and are the best in all 3 categories you can even win $1450.

    All details on this special page


    REBEL CENTURY's new "flexible engine concept" allows easy and powerful tweaks (tuning) of the engine by the user. Here are some examples of what is possible with the new REBEL CENTURY:


    Multiple ENGINE files can be created and loaded. These files are called PERSONALITIES. Within Rebel 6 famous personalities are pre-programmed and can be loaded from the menu OPTIONS. Click on the above players to view some examples (including diagrams) and see that is possible to addapt the playing style of these great chess players with REBEL CENTURY new engine concept.

    EPD databases

  • A number of EPD databases is installed after installation. EPD databases can be analyzed using Rebel's "Analyze EPD database" function (menu EXTRA).

  • EPD is the standard format to exchange positions (or game fragments) between various chess software. The EPD format has become very popular the last years. The provided EPD2DIAG program on this cdrom is a good example of that.

  • PGN databases

  • A number of PGN databases is installed after installation. PGN databases can be viewed using Rebel's "Enter PGN database" function (menu DATA)

  • PGN is the standard format to exchange chess games between various chess software.

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    Since November 23, 1995