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============================== My email: jotes@go2.pl



New version chess engine: Puffin 4.0

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Puffin - UCI chess Engine, Author: Kurt
Rating Chess Engines Diary CEDR=2695 

v.4.0:
All-around improvements that hopefully lead to a decent gain in strength. I expect (hope?) that the strength is now around 2900 Elo, roughly a 150 Elo gain (relative to the CCRL ratings list).

Some, but not all, of the changes:
Better time management
Added countermove heuristic
Added SEE pruning to main and quiescent searches
Tweaks to existing pruning techniques
Added bishop pair eval term to evaluation
Added rook on open file eval term
Improvements to existing evaluation items
Validate hash move before attempting to play it
Better thread management
Self-play vs Puffin 3.0

Score of Puffin 4.0 vs Puffin 3.0: 113 - 8 - 44  [0.818] 165
...      Puffin 4.0 playing White: 54 - 5 - 24  [0.795] 83
...      Puffin 4.0 playing Black: 59 - 3 - 20  [0.841] 82
...      White vs Black: 57 - 64 - 44  [0.479] 165
Elo difference: 261.3 +/- 51.8, LOS: 100.0 %, DrawRatio: 26.7 %
SPRT: llr 2.95 (100.3%), lbound -2.94, ubound 2.94 - H1 was accepted
Bullet (10s+0.1) Gauntlet

   # PLAYER         :  RATING  ERROR  POINTS  PLAYED     W     D     L  D(%)
   1 frozenight     :  3125.0   ----   513.5     600   465    97    38    16
   2 avalanche      :  2880.3   34.4   357.0     600   273   168   159    28
   3 halogen        :  2843.3   34.2   326.0     600   260   132   208    22
   4 leorik         :  2838.0   34.6   321.5     600   248   147   205    25
   5 Puffin 4.0     :  2812.9   28.1  2576.0    4800  2027  1098  1675    23
   6 Lynx           :  2720.2   34.7   222.5     600   131   183   286    31
   7 princhess      :  2707.6   35.5   212.5     600   164    97   339    16
   8 peacekeeper    :  2622.7   36.8   151.5     600    97   109   394    18
   9 Puffin 3.0     :  2569.0   37.4   119.5     600    37   165   398    28
 

Puffin 3.0 - results:
OpponentScore+-Games
Expositor 4WR020/6-66 Games
Sirius 6.00/5-55 Games
Molybdenum 3.00/4-44 Games
Knightx 3.91.5/3+03 Games
Lishex 1.1.11/3-13 Games
DanaSah 9.11/3-13 Games
Orion 1.00.5/3-23 Games
SF-PRO 16.03.20240/3-33 Games
SF 16.1 MPV0/3-33 Games
Devel 4.0.2.30/3-33 Games
Cool Iris 12.10 D-30720/3-33 Games
Cool Iris 12.100/3-33 Games
Stockfish 16.10/3-33 Games
Velvet 7.1.00/3-33 Games
Galjoen 0.41.20/3-33 Games
Equisetum 1.00/3-33 Games
K2 0.990/3-33 Games
Fire 9.30/3-33 Games
Obsidian 11.00/3-33 Games
Axon 0.32/2+22 Games
Belette 2.0.01/2+02 Games

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