New chess engine: Protej 0.6.7
Protej - UCI chess engine, Author - Alex Brunetti
Rating Chess Engines Diary CEDR=3134
Protej 0.6.6 results:
| Kuma 1.2 | 1.5/8 | -5 | 8 Games |
| Laser 1.7 | 1/8 | -6 | 8 Games |
| Defenchess 2.3 | 1.5/6 | -3 | 6 Games |
| Avalanche 2.1.0 | 1/6 | -4 | 6 Games |
| Frozenight 6.0.0 | 1/6 | -4 | 6 Games |
| LTChess 9.3 | 0.5/6 | -5 | 6 Games |
| Counter 5.5 | 0/6 | -6 | 6 Games |
| Ippolit 032324 | 4/5 | +3 | 5 Games |
| Invictus r382 | 3/5 | +1 | 5 Games |
| Mida 2.3.1 | 2/5 | -1 | 5 Games |
| Tcheran 1.1 | 4/4 | +4 | 4 Games |
| Kobra 0.1 | 4/4 | +4 | 4 Games |
| Oxidation 0.5.0 | 4/4 | +4 | 4 Games |
| Maxwell 3.0.8 | 4/4 | +4 | 4 Games |
| Blocky 1.0.0 | 4/4 | +4 | 4 Games |
| Knightx 3.9 | 3.5/4 | +3 | 4 Games |
| Ippolit 051323 | 3/4 | +2 | 4 Games |
| Pingu 3.0.0 | 3/4 | +2 | 4 Games |
| Svart 6 | 1.5/4 | -1 | 4 Games |
| DanaSah 9.1 | 1.5/4 | -1 | 4 Games |
| Pedantic 1.0.0 | 1.5/4 | -1 | 4 Games |
v. 0.6.7:
New official release.
It includes all updates released with the dev versions after Protej 0.6.6:
the terms of the pawn evaluation function have been refined, and the level of abstraction, which in Delphi is counterproductive, has also been reduced
the evaluation of passed pawns in specific types of positions has been toned down, as their strength was previously overestimated
improved the search function by adjusting the search parameters and making various refinements, resulting in slightly better move ordering and search efficiency.
Non-functional changes:
new compiler version, Delphi 12
the Online Syzygy feature and its associated UCI options have been removed
removed the graphical embellishments used in console mode, as this mode is virtually unused and the extensive code did not offer any improvement to the playing strength.
It includes also:
global tuning to slightly improve overall performance
reduced the impact of the complexity factor on the flattening of position evaluations
refined the values used in the dynamic score procedure to achieve a slightly more accurate evaluation of the position.
Non-functional changes:
removed all command-line actions, including bench, go, perft, view: this change simplifies and reduces the codebase, and these tasks can still be performed directly from the console
the set of positions used for benchmarking has been updated; there are now 5 positions, which should take approximately 10 seconds to complete on an i7-12700 CPU
the license file must now be present in the execution directory.
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