SUPRA - UCI chess engine
http://suprachesssystem.com/

SUPRA 8.2.2 is available

What's New in This Release:
- Better time management.
Download

SUPRA 9.0 is available

What's New in This Release:
- Static and Dynamic positional matrices.
- parameterization of aggressiveness.
Download

SUPRA 10.0 released

What's New in This Release:
- Algorithm equivalent to the minimax with alpha beta pruning and killer moves heuristic.
- Improved Static and Dynamic positional matrices + temperament configurable + Own Book: a very human style playing.
- Better definition.
- Better time management.

Download:
http://suprachesssystem.com/1/upload/supra_10.0.zip

SUPRA 10.1 released

What's New in This Release:
- Algorithm equivalent to the minimax with alpha beta pruning and killer moves heuristic.
- Improved Static and Dynamic positional matrices.
- improvement in comprehension of passed pawns.
- better understanding of the finals.
- Better time management.
- Error correction for infrequent but serious sometimes do successive castling of SUPRA: This error was discovered by shahinjy in his tournaments with SUPRA and other engines (Thank you shahinjy!)

Download:
http://suprachesssystem.com/1/upload/supra_10.1.zip

SUPRA 10.1.1

What's New in This Release:
- Algorithm equivalent to the minimax with alpha beta pruning and killer moves heuristic.
- Improved Static and Dynamic positional matrices: a much better and more humane vision of the game especially in the middle game.

Download:
http://suprachesssystem.com/1/upload/supra_10.1.1.zip

SUPRA 11

What's New in This Release:
- Algorithm equivalent to the minimax with alpha beta pruning and killer moves heuristic.
- New wormhole pruning allowing SUPRA be up to 10 times faster.
- improve the cutting effect of positive and negative float filter.
- reinforcement of aggression to the king in positional dynamic arrays.
- reasonable improvement in the ability of promotion of pawns in the end game.
- Total correction of deep memory of SUPRA

Download:
http://suprachesssystem.com/1/upload/supra_11.0.zip

SUPRA 11.2
* Full restoration of the deep memory: 10-20% faster.
http://suprachesssystem.com/1/upload/supra_11.2.zip

SUPRA 11.3

- increased the reliability of the vertical filter.
- increase of the speed of deep memory processes.

Download:
http://suprachesssystem.com/1/upload/supra_11.3.zip

SUPRA 11.4

- New 64-bit version 10-20% faster on 64 bit systems.
- Improving the reliability of negative and positive float filter.
- New Turbo search: when activated allows SUPRA use a method of searching a bit faster by staged increments of alpha.
- corrected error of evaluation sent to the GUI arena (error reported by Shahinjy).
- fix a small error in the analysis of a tie by drowning the enemy king.

http://suprachesssystem.com/1/upload/supra_11.4.zip

SUPRA 11.5.1

- Small improvement in positive float filter.

http://suprachesssystem.com/1/upload/supra_11.5.1.zip

strong

SUPRA 13.0

- Internal clock: better time control.
- Internal iterative deepening until level deph=4 allowing a much better level ordering until deph=4.
- FENstring compatibility: SUPRA is now able to play games whose position is defined by the user and can thus play variants of traditional chess game such as chess 960!
- Better interaction with the GUI: SUPRA now sends additional information to the GUI such as use of memory.
- Error correction in filtering that did not allow SUPRA properly analyze future promotions.

http://suprachesssystem.com/1/upload/supra_13.0.zip

Supra 13.1

Changes:

error (of the internal iterative depening) detected and corrected after shahinjy warning me of poor performance of SUPRA 13.0 in his tournaments (thanks shahinjy for your work in your test!)

http://suprachesssystem.com/1/upload/supra_13.1.zip

SUPRA 13.2

- New pieces value suggested by shahinjy (thanks shahinjy!) and consistently more effective: queen=90 (instead of 100) decipawn; horse=32 (instead of 35) decipawn; Bishop=33 (instead of 30) decipawn. Tower maintains 50 decipawn and pawn maintains 10 decipawn.

http://suprachesssystem.com/1/upload/supra_13.2.zip

SUPRA 14.0

http://suprachesssystem.com/1/upload/supra_14.0.zip

SUPRA 15.0

- increased of effect and security of Turbo search
- better time control in all phases of game
- better performance in finals
- correction of failure in controlling the time which led to many losses in time

http://suprachesssystem.com/1/upload/supra_15.0.zip

Supra v16.0

http://suprachesssystem.com/1/upload/supra_16.0.zip

- tuning in Turbo
- tuning in vertical filter
- profound improvement in the ability of analyzing positions of repetitions in draw
- correction in memory
- correction in deep memory

SUPRA 18

- New Null move filter (adjustable in control panel of GUI-engine: engine parameteres).
- New Terminal filter.
- Considerable improvement in the extra evaluation  giving to Supra  better vision of pawns game.
- Max deph=18: more 4 level than Supra 17.

http://suprachesssystem.com/1/upload/supra_18.zip

Supra 19.1
- important correction in time management
http://suprachesssystem.com/1/upload/1_supra_19.1.zip

SupraChess v20.1
http://www.supra-chess-engine.info/

Supra 21 Pro

(estimated elo ~1600)

http://www.supra-chess-engine.info/
or direct download link  
http://www.supra-chess-engine.info/1/upload/supra_21.0_pro.zip

Supra 21 pro wrote:

• Substantial improvement of extra evaluation.
  
• Calibration of the vertical filter.
  
• Correction and activation of PVS.
  
• Set of small improvements.
  
• Implementation logarithms in the evaluation function (only in Supra 21.0;  Supra 21.0 pro don t use logarithms and is 50 elo stronger than Supra 21.0)
  

Logarithms (which can be calibrated trough of parameters: quotient material, Positional relevance and mobility)  give to Supra the ability to give in to a maximum of 1 pawn due to substantial gain in position or quotient material. Although seems be advantageous to  this capability it is not properly calibrated.

Like all previous versions Supra 21.0 pro still overstates the change stuff and never makes sacrifices of pieces.