Open Source Blitz: Stockfish 2.2.2

[lucasart]

my testing seems to confirms the rumours that SF 2.2.2 is significantly stronger than 2.2.1 (20-30 elo)
remember to look at the error bar however

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Rank Name                  Elo    +    - games score oppo. draws 
   1 Critter 1.4          3240   36   35   300   75%  3031   31% 
   2 Stockfish 2.2.2      3189   41   39   250   71%  3011   27% 
   3 IvanHoe 999946h      3182   35   34   300   65%  3051   33% 
   4 Protector 1.4        2920   32   32   400   51%  2915   21% 
   5 Umko 1.2             2867   27   27   550   53%  2854   24% 
   6 Toga 1.4.1           2847   25   25   650   57%  2804   24% 
   7 Daydreamer 1.75      2741   25   25   550   61%  2662   29% 
   8 Fruit 2.1            2700   23   23   650   52%  2682   26% 
   9 Crafty 23.4          2667   25   25   550   45%  2706   23% 
  10 Cheng3 1.07          2655   26   26   500   54%  2628   25% 
  11 GNU Chess 5.07.173b  2645   23   23   600   47%  2667   28% 
  12 Arasan 13.4          2640   25   25   550   47%  2660   22% 
  13 Rodent 0.10          2633   24   24   550   55%  2598   26% 
  14 Scorpio 2.7          2628   22   22   700   44%  2677   27% 
  15 Pepito 1.59          2596   23   23   650   52%  2578   23% 
  16 Sloppy 0.2.2         2540   22   22   750   41%  2604   24% 
  17 EXchess 6.10         2535   24   23   650   59%  2463   24% 
  18 Greko 9.0            2495   22   22   750   41%  2567   23% 
  19 Pawny 0.3.1          2475   27   27   500   48%  2495   19% 
  20 DoubleCheck 2.5.2    2464   27   26   500   56%  2418   21% 
  21 Olithink 5.3.0       2385   29   29   400   49%  2391   21% 
  22 Sungorus 1.4         2342   26   27   500   38%  2430   23% 
  23 Jazz 501             2317   30   30   400   39%  2399   20% 
  24 Beowulf 2.4          2254   35   36   300   34%  2381   19% 
  25 KMT Chess 1.2.1      2246   35   36   300   33%  2383   17% 

[mcostalba]

my testing seems to confirms the rumours that SF 2.2.2 is significantly stronger than 2.2.1 (20-30 elo)

Perhaps that little easy move detector bug has more impact than one would assume: I noticed it while watching a game on Playchess of a SF against a Houdini.

Houdini pushed a pawn in a very complicated position where SF was in advantage and SF immediately took it and immediately found itself fighting for a draw !

I understand it happens rarely, but when it happens a single bad move could compromise an entire game, especially at mid/long TC: with these monsters a single weak move is enough to lose a game.

[lucasart]

I played another 50 games vs Critter, IvanHoe, and Protector. So that SF 2.2.2 replays exactly the same games then SF 2.2.1. About +10 elo now. Anyway the easy move is certainly a good bugfix

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Rank Name                  Elo    +    - games score oppo. draws 
   1 Critter 1.4          3245   33   32   350   73%  3052   32% 
   2 IvanHoe 999946h      3186   32   31   350   64%  3069   35% 
   3 Stockfish 2.2.2      3178   30   30   400   65%  3052   31% 
   4 Protector 1.4        2921   30   30   450   47%  2944   22% 
   5 Umko 1.2             2867   27   27   550   53%  2854   24% 
   6 Toga 1.4.1           2847   25   25   650   57%  2804   24% 
   7 Daydreamer 1.75      2741   25   25   550   61%  2662   29% 
   8 Fruit 2.1            2700   23   23   650   52%  2682   26% 
   9 Crafty 23.4          2667   25   25   550   45%  2706   23% 
  10 Cheng3 1.07          2655   26   26   500   54%  2628   25% 
  11 GNU Chess 5.07.173b  2644   23   23   600   47%  2667   28% 
  12 Arasan 13.4          2640   25   25   550   47%  2660   22% 
  13 Rodent 0.10          2632   24   24   550   55%  2598   26% 
  14 Scorpio 2.7          2628   22   22   700   44%  2677   27% 
  15 Pepito 1.59          2596   23   23   650   52%  2578   23% 
  16 Sloppy 0.2.2         2540   22   22   750   41%  2604   24% 
  17 EXchess 6.10         2535   24   23   650   59%  2462   24% 
  18 Greko 9.0            2495   22   22   750   41%  2567   23% 
  19 Pawny 0.3.1          2475   27   27   500   48%  2494   19% 
  20 DoubleCheck 2.5.2    2464   27   26   500   56%  2418   21% 
  21 Olithink 5.3.0       2385   29   29   400   49%  2391   21% 
  22 Sungorus 1.4         2342   26   27   500   38%  2430   23% 
  23 Jazz 501             2317   30   30   400   39%  2399   20% 
  24 Beowulf 2.4          2253   35   36   300   34%  2381   19% 
  25 KMT Chess 1.2.1      2246   35   36   300   33%  2383   17%