Aart's Blog

The new Komodo has been heavily tested by many chess fans, and Larry and Don had to make a few bug fixes. You can find an Android binary of the latest version 2.03 at the usual place . Quick tournament on a Nexus S: 1   Komodo32 2.03 AB  +34/-23/=43 55.50%   55.5/100 2   Komodo32 2.01 AB  +23/-34/=43 44.50%   44.5/100

Another tournament between the top engines on a Nexus One, 32MB hash, one-second per move.                      1           2           3                                    1 Stockfish 2.0      ***         48.5 - 51.5 59.0 - 41.0 107.5/200 2 RobboLito 0.085e4l 51.5 - 48.5 **          50.0 - 50.0 101.5/200 3 Komodo32 2.01 AB   41.0 - 59.0 50.0 - 50.0 **           91.0/200

Don Dailey and Larry Kaufman released version 2 of their chess engine Komodo. You can find an ARM-based Android binary on UCI engines for Android . The new release seems stronger than the already impressive previous version. A quick one second-per-move, 32MB hash tournament on a Nexus S against Komodo1.3 resulted in 73 vs. 27 in favor of Komodo2. 1   Komodo32 2AB     +58/-12/=30 73.00%   73.0/100 2   Komodo32 1.3 JA  +12/-58/=30 27.00%   27.0/100 The new Komodo scored 48.5% against Stockfish 2.1 under the same settings. 1   Stockfish 2.1  +38/-35/=27 51.50%   51.5/100 2   Komodo32 2AB   +35/-38/=27 48.50%   48.5/100

After this previous tournament , I conducted a tournament between various versions of the top engines under the same settings with more games. The results are shown below. Congrats to the stockfish team for winning this tournament!                            1 Stockfish 2.0           323.5/500 2 Stockfish 2.1           316.5/500 3 RobboLito 0.085e4l      250.5/500 4 RobboLito 0.085g3l      240.0/500 5 IvanHoe-Beta v999947c   196.5/500 6 Komodo32 1.3 JA         173.0/500

I computed the perft number for 8x8 checkers for depth 24 with the same distributed implementation I used earlier for depths up to 23. Below you see the perft breakdown per move (called "divide") from the initial position for depths 22, 23, and 24. move         divide(22)       divide(23)        divide(24) ---------------------------------------------------------- 12-16:  243598269855110 1123463594881857  5192042148594780 11-16:  246743868125768 1131373985922218  5248615918291379 11-15:  209016678583301  984253557821317  4602138522979438 10-15:  215412869777867 1000606302770349  4643700995955222 10-14:  184865466345796  856779998157523  3988937724259353  9-14:  213736468971938 1003310451936358  4712325943133747  9-13:  288999100078322 1337748969176591  6263620622082081 -----------------------...

I just released version 2.9 of Chess for Android, available from the Android market or as direct download . New features include: + built-in engine improvements (thanks to Attila for reporting) + various UCI improvements        engine tournament feature (with resume option)        option settings saved per engine        more flexible uninstall or clear options window        added robbobases support

I conducted a full tournament between 17 currently available UCI engines for Android as well as the simple built-in Java engine. The tournament consisted of pair-wise matches between all engines for 10 games with random book opening play, one second-per-move, 32MB hash, and 8MB tablebases cache with the 3- and 4-piece Nalimov, Gaviota, Scorpio, Robbobases endgames on SD card. The 1530 games lasted about two days running full time on a Nexus One phone (without a single crash!). The results are shown below. 1  Stockfish 2.0                   157.5/170 2  RobboLito 0.085g3l              152.5/170 3  IvanHoe-Beta version 999947c    145.0/170 4  Komodo32 1.3 JA                 137.0/170 5  Toga II 1.4.1SE                 130.5/170 6  Pepito v1.59            ...

A test tournament between different versions of Miguel Ballicora's Gaviota and Michel Van den Bergh's GNU chess.                          1          2          3          4          5           1 GNU Chess 5.07.170.7b ********** 000½10011½ 11½1110110 1100½01001 0111101111 24.0/40 2 gaviota v0.80.0.107   111½01100½ ********** ½010110100 0100½11110 ½101000011 20.5/40 3 GNU Chess 5.07.153.3b 00½0001001 ½101001011 ********** 0101010½01 0111111½10 20.0/40 4 gaviota v0.82-beta2   0011½10110 1011½00001 1010101½10 ********** 00110001½0 19.0/40 5 gaviota v0.83         1000010000 ½010111100 1000000½01 11001110½1 ********** 16.5/40 And another test tournament between different versions of Jan Brouwer's Rotor and Ben-Hur Carlos Vieira Langoni Jr.'s RedQueen.     ...

Another test tournament between different Android Stockfish versions and compilations (from Jim Ablett and myself ).            1          2          3          4          5          6           1 2.0      ********** 01½11½01½0 0½1½0100½½ 010½½½½½½1 ½1011½½½½1 ½11001½½11 27.5/50 2 2.1 JA   10½00½10½1 ********** 1½½1½1½100 ½½11½00111 1½011½½010 1½00001½1½ 27.0/50 3 2.1.1 JA 1½0½1011½½ 0½½0½0½011 ********** ½½½1½10½½½ 0½0010½½½½ ½½1½101½½1 25.5/50 4 1.9      101½½½½½½0 ½½00½11000 ½½½0½01½½½ ********** 100½1½0½1½ 1½10½0111½ 24.5/50 5 2.1      ½0100½½½½0 0½100½½101 1½1101½½½½ 011½0½1½0½ ********** ½½010½0101 24.0/50 6 1.8      ½00110½½00 0½11110½0½ ½½0½010½½0 0½01½1000½ ½½101½1010 ********** 21.5/50

I am generalizing the engine match feature in Chess for Android  into an engine tournament feature, where several engines can be invited at once, after which the GUI plays matches between all engine pairs. To test this new feature, I ran a tournament between a few of the Android UCI engines recently released on Jim Ablett's Chess Projects Website , as well as the built-in Java engine (using the fast-move setting, 32MB hash, and Nalimov, Gaviota, Scorpio, Robbobases endgame tablebases on SD card). Below the results are given in cross-table format.                   1          2          3          4          5          6  1 Stockfish 2.1.1 ********** 11110½11½1 111½111111 1111111111 1111111111 1111111111   47.5/50 2 Komodo32 1.3    00001½00½0 ********** 1111111111 1111111111 111111111...