Deuterium v11.01.28.159 released

[Ferdy]

Changes/modifications are the ff.

Version 11.01.28.159
1. Fixed minor bugs in null move pruning conditions.
2. Fixed minor bug in null move pruning verification search.
3. Improve SEE x-rays.
4. Added LMR in root search.
5. Added LMR on capture moves.
6. Added aggressive depth reduction in LMR for non-capture moves.
7. Added IID on non-pv nodes.
8. Modify IID on pv nodes.
9. Implemented searching hash move first before generating other moves.
10. Added Time_Increment_Factor option in deuterium.ini file to reduce increments
in seconds when used in cutechess-cli interface playing against uci engines.
11. Improve move ordering for generate_evasion routine.
12. Improve code readability.

Probably 15-25 elo better than previous version.
Can be found here, http://sites.google.com/site/deuteriumengine/home

[Graham Banks]

Thanks Ferdinand.

[Ferdy]

Thanks Ferdinand.

Got comparison results here at tc=40 moves / 30 sec, strong engines were assigned at much faster TC, 2400 games each using 50 Silver pgn test suite, run with side reversed. Interface cutechess-cli, with concurrency set to 5. Ponder off, hardware AMD Phenom II x6 1055T.

Code: Select all

20 Deuterium v11.01.28.159       7 2400.0 (1153.0 : 1247.0)
                                     100.0 ( 23.0 :  77.0) Houdini 1.5a w32            207
                                     100.0 ( 37.0 :  63.0) Scorpio_2.7 JA              141
                                     100.0 ( 33.5 :  66.5) Crafty-23.4 PS              125
                                     100.0 ( 37.5 :  62.5) Spike 1.2 Turin             103
                                     100.0 ( 28.5 :  71.5) Naraku 1.31                 101
                                     100.0 ( 38.0 :  62.0) Bison 9.11                   99
                                     100.0 ( 40.0 :  60.0) BugChess2 V1.7               94
                                     100.0 ( 36.5 :  63.5) Komodo32 1.3 JA              71
                                     100.0 ( 46.5 :  53.5) Gull 1.1                     61
                                     100.0 ( 43.0 :  57.0) Daydreamer 1.75 JA           32
                                     100.0 ( 45.5 :  54.5) Tornado 4.4                  19
                                     100.0 ( 50.0 :  50.0) Spike 1.4                    18
                                     100.0 ( 48.0 :  52.0) Thinker 5.4D Inert SP-x86    13
                                     100.0 ( 43.0 :  57.0) Amyan 1.72                    7
                                     100.0 ( 47.5 :  52.5) spark-1.0                     1
                                     100.0 ( 56.5 :  43.5) Protector 1.4.0 x32 JA      -20
                                     100.0 ( 56.5 :  43.5) N2 0.4                      -39
                                     100.0 ( 60.0 :  40.0) Sloppy-0.2.3                -40
                                     100.0 ( 59.5 :  40.5) Hannibal 1.0a               -50
                                     100.0 ( 60.0 :  40.0) Fruit 2.3.1                 -53
                                     100.0 ( 68.0 :  32.0) Hamsters 0.7.1              -59
                                     100.0 ( 62.5 :  37.5) Critter 0.90 32-bit         -81
                                     100.0 ( 62.0 :  38.0) Dirty JA Dec 11 2010       -101
                                     100.0 ( 70.5 :  29.5) Stockfish 2.0.1 JA         -127

Code: Select all

45 Deuterium v10.01.27.213     -33 2400.0 (1026.5 : 1373.5)
                                     100.0 ( 17.5 :  82.5) Houdini 1.5a w32            207
                                     100.0 ( 32.0 :  68.0) Scorpio_2.7 JA              141
                                     100.0 ( 32.0 :  68.0) Crafty-23.4 PS              125
                                     100.0 ( 32.5 :  67.5) Spike 1.2 Turin             103
                                     100.0 ( 33.5 :  66.5) Naraku 1.31                 101
                                     100.0 ( 27.0 :  73.0) Bison 9.11                   99
                                     100.0 ( 34.5 :  65.5) BugChess2 V1.7               94
                                     100.0 ( 39.0 :  61.0) Komodo32 1.3 JA              71
                                     100.0 ( 31.0 :  69.0) Gull 1.1                     61
                                     100.0 ( 44.5 :  55.5) Daydreamer 1.75 JA           32
                                     100.0 ( 48.5 :  51.5) Tornado 4.4                  19
                                     100.0 ( 49.5 :  50.5) Spike 1.4                    18
                                     100.0 ( 42.0 :  58.0) Thinker 5.4D Inert SP-x86    13
                                     100.0 ( 41.0 :  59.0) Amyan 1.72                    7
                                     100.0 ( 47.0 :  53.0) spark-1.0                     1
                                     100.0 ( 46.0 :  54.0) Protector 1.4.0 x32 JA      -20
                                     100.0 ( 51.5 :  48.5) N2 0.4                      -39
                                     100.0 ( 49.0 :  51.0) Sloppy-0.2.3                -40
                                     100.0 ( 55.5 :  44.5) Hannibal 1.0a               -50
                                     100.0 ( 52.0 :  48.0) Fruit 2.3.1                 -53
                                     100.0 ( 49.5 :  50.5) Hamsters 0.7.1              -59
                                     100.0 ( 52.5 :  47.5) Critter 0.90 32-bit         -81
                                     100.0 ( 60.0 :  40.0) Dirty JA Dec 11 2010       -101
                                     100.0 ( 59.0 :  41.0) Stockfish 2.0.1 JA         -127