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Igel 1.7.0
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@vshcherbyna vshcherbyna released this 17 Jun 19:27
· 102 commits to master since this release
1.7.0
0e7599e
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Learn about vigilant mode.

What's new:

  • Avoid LMR for moves that make pawn pushes to 5th and 6th ranks
  • Apply LMR at shallow depths
  • Implement counter move, follow up move and history move pruning
  • Implement probcut
  • Avoid prunning in IID path
  • Enable LMR during endgames
  • Do not spend time evaluating forced moves, simply return an evasion move as soon as possible

Strength improvements over 1.6.0 in CCRL 40/4 time control:

Score of Igel 1.7.0 64 POPCNT vs Igel 1.6.0 64 POPCNT: 178 - 105 - 295 [0.563] 578
Elo difference: 44.12 +/- 19.80

Relative strength compared to division 5 engines in CCRL 40/4 time control:

Rank Name                          Elo     +/-   Games   Score   Draws
0 Igel 1.7.0 64 POPCNT           15      19     900   52.1%   29.3%
1 Arminius 2018-12-23            78      58     100   61.0%   30.0%
2 gogobello 2.0                  10      59     100   51.5%   25.0%
3 RuyDos 1.1.9                    7      57     100   51.0%   30.0%
4 Cheese 2.0 64 bits              0      57     100   50.0%   32.0%
5 Devel 2.0000                  -24      55     100   46.5%   35.0%
6 Topple 0.5.0                  -24      60     100   46.5%   25.0%
7 GreKo 2018.08                 -31      55	100   45.5%   37.0%
8 Shield 2.1                    -35      58     100   45.0%   30.0%
9 Fridolin 3.10                -115      64     100   34.0%   20.0%

Relative strength compared to Cheng 4.39 in CCRL 40/4 time control:

Score of Igel 1.7.0 64 POPCNT vs Cheng 4.39: 128 - 601 - 271  [0.264] 1000
Elo difference: -178.56 +/- 19.73

Relative strength compared to Cheng 4.39 in 60+0.1 time control:

Score of Igel 1.7.0 64 POPCNT vs Cheng 4.39: 153 - 975 - 257  [0.203] 1385
Elo difference: -237.32 +/- 19.22

The previous score of Igel 1.6.0 against Cheng 4.39 is much lower in CCRL 40/4 time control:

Score of Igel 1.6.0 64 POPCNT vs Cheng 4.39: 40 - 343 - 117  [0.197] 500
Elo difference: -244.10 +/- 30.51
Assets 3