Hi everyone 

What's the best chess engine to use and where I can get it?

To use it for what?

for everything basically like studying your previous game, constructing some positions in the board etc

Rybka is clearly the best at the moment. However, if you're interested in a chess engine and GUI that runs on Linux, Windows and OS X, Deep Shredder 12 isn't far behind.

Hmmm but they expensive. I want is good but I can just download it for free.

try this 

http://scid.sourceforge.net/

The best is your own personal chess playing experience. 

Nothing can beat that.

(in my opinion)

Lol, if you can memorize 512 played games. And can find all the best moves by yourself. If you cant, you need engine. To see what you missed, and what was good in game.

 " You get what you pay for". 

To be honest, I've found the chess.com computer pretty good at the analysis of your own games. The only problem with it is that it is inflexible, in that you can't import PGNs but have to submit your own games played on this site. It is only (!) ~2500, but that's plenty good enough for me.

I don't think your own personal chess playing experience would have much chances against Deep Rybka 3.

Amen.

But, if you must have free, get Arena and a handful of free engines. http://www.playwitharena.com/ Arena is a useful GUI that supports UCI and Winboard engines. You can download it with AnMon 5.6, Dragon 4.6, Hermann 2.4, Nejmet 3.07, ProDeo 1.5, Ruffian 1.05, Rybka 2.2 free, SOS 5.1 for Arena and Spike 1.2--several strong engines there. As you feel the need, you can install other engines.

Hmmm I kind of agree on your opinion RealDarren but I think it will still be better if I'm going to use an engine.

Well one main reason why I want good engine is to basically analyse my previous games and the chess player's game. Right now I'm using winboard but I'm still looking something better.

I agree on what you said Sir Rex but the problem is  at the moment I can't afford something that so expensive.

The best chess engine took a lot of effort to develop so it shouldn't be a surprise that it costs money. However, one good free option is SCID and Stockfish (best free engine).

i find crafty to be good too. but what it says is better than what i play i find to be weird sometimes. anyone know why?

Top 40:

Rank Name                       Elo    +    -  games  score oppo. draws  

   1 Rybka 3-x64-2cpu           3090   69   64   104   81%  2837   24% 
   2 Naum 4.0-2cpu-x64          3039   63   60   104   76%  2841   33% 
   3 Thinker 5.4j-x64-2cpu      2994   81   77    52   65%  2889   38% 
   4 Fruit 2.6d-x64-2cpu        2988   81   78    52   64%  2889   37% 
   5 Zappa Mexico II-x64-2cpu   2970   60   57   104   70%  2826   36% 
   6 Hiarcs 12.1-2cpu           2949   59   57   104   64%  2848   36% 
   7 Glaurung 2.2-x64-2cpu      2904   57   56   104   59%  2851   40% 
   8 Bright 0.4a-2cpu           2897   57   56   104   56%  2852   40% 
   9 Spike 1.3x6-2cpu           2872   78   79    52   46%  2898   38% 
  10 Jonny 3.07b-2cpu           2852   58   58   104   50%  2855   30% 
  11 Ktulu 9.0                  2851   56   56   104   52%  2835   37% 
  12 Crafty 23.0-x64-2cpu       2779   75   72    52   65%  2690   54% 
  13 ChessTiger 2007.1          2764   42   42   196   53%  2741   40% 
  14 TwistedLogic 20090105-x64  2757   99   89    44   77%  2560   27% 
  15 Movei 0.08.438             2722   42   42   196   57%  2676   30% 
  16 Pro Deo 1.6                2718   56   58   104   33%  2845   38% 
  17 Gandalf 6.01               2716   21   21   748   54%  2690   35% 
  18 Chiron 0.87                2710   37   37   252   55%  2674   27% 
  19 Equilibrium 2.6.17         2708   56   57   104   44%  2759   34% 
  20 Delfi 5.4-2cpu             2706   56   56   104   44%  2759   36% 
  21 WildCat 8.0                2701   50   51   132   45%  2739   31% 
  22 Scorpio 2.1-x64-2CPU       2699   77   77    52   50%  2696   38% 
  23 Booot 4.15.0               2687   63   61    88   64%  2590   33% 
  24 Pharaon 3.5.1-2cpu         2687   49   49   132   44%  2740   39% 
  25 Alaric 707                 2676   42   41   208   67%  2554   27% 
  26 Colossus 2008b             2676   55   56   104   40%  2741   40% 
  27 Ruffian 2.1.0              2670   19   19   952   50%  2670   36% 
  28 SlowChess blitz WV2.1      2667   28   29   408   40%  2736   36% 
  29 Frenzee Feb08-x64          2661   54   54   116   58%  2611   28% 
  30 The Baron 3.8-x64-2cpu     2658   88  100    52   17%  2914   23% 
  31 Cyrano 0.6b17-x64          2658   55   54   116   66%  2551   33% 
  32 Aristarch 4.50             2657   20   20   856   49%  2665   33% 
  33 Maestro 3.0                2655   50   51   132   40%  2729   34% 
  34 E.T.Chess 130108           2649   66   63    88   64%  2548   22% 
  35 Alfil 8.11                 2645   50   48   188   74%  2440   20% 
  36 Hamsters 0.7.1             2643   63   61    88   59%  2580   28% 
  37 Petir 5.0                  2632   40   40   208   53%  2606   31% 
  38 Arasan 11.4-x64            2629   87   85    44   58%  2572   34% 
  39 BugChess2 1.6.3-x64        2623   56   55   116   60%  2543   24% 
  40 Pseudo 0.7c                2613   23   23   668   53%  2589   31% 

http://wbec-ridderkerk.nl/html/BayesianElo_ed16.htm

You know, the chess.com analyzer is just perfect for what you need.  Of course, if you want to cheat in your games like many other pathetic noobs on here, the more experienced players will know and you will get kicked off after being reported.  In which case, you are right, you dont want to spend money on it.  

If you have a device that uses windows mobile pocket grandmaster light is under 10 bucks?

Of all the posts throughout the forums why is it that I never see any mention of the Rebel/Rebel Decade chess engine? The freeware version (Rebel Decade) is ~2300 ELO...the strength of the fully enabled Rebel is ~2500 ELO - either of which would be more than enough for the majority of players here. Anyoneelse ever used either engine?