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Chess engine: Alexandria 2.3.1 NNUE

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Chess engine: Alexandria 
Author: Normand M. Blais  Rating CEDR=2847

v.2.3.1
What's Changed
Use a conditional jump when the position is in check by @PGG106 in #11
Implement improving variable and reduce fut margin by @PGG106 in #12
IIR by @PGG106 in #13
Tweak Aspiration windows by @PGG106 in #14
Change the way the TT is probed by @PGG106 in #16
The last (known) bug that has ever plagued alexandria has been fixed, some minor search fixed were made, this release should gain 30-40 elo against the non shadowdropped release of 2.3 and 10-20 against the shadowdropped one.

As it stands this is Alexandria's final release. Tt's been a fun journey and i'm happy with how strong it is, but testing became frankly usufferable and there are no new ideas that i fully understand and that i'm capable of implementing, good luck to anyone that'll ever work on an engine ;).

Alexandria 2.3.1 NNUE download

Individual statistics: Alexandria 2.1.0 - 75 games CEDR  (+ 11,= 19,- 45), 27.3 %

Fritz 17                      :   6 (+  0,=  5,-  1), 41.7 %
Stockfish 15                  :   6 (+  0,=  1,-  5),  8.3 %
Fisherov 0.98k                :   5 (+  1,=  0,-  4), 20.0 %
Wasp 5.50                     :   1 (+  0,=  0,-  1),  0.0 %
Arasan 23.3                   :   5 (+  0,=  0,-  5),  0.0 %
Black Marlin 5.0              :   1 (+  0,=  0,-  1),  0.0 %
ChessKISS 1.8                 :   4 (+  4,=  0,-  0), 100.0 %
Rebel 15x2                    :   1 (+  0,=  0,-  1),  0.0 %
Berserk 9-dev3                :   2 (+  0,=  0,-  2),  0.0 %
StockfishMZ Iccf 240522       :   4 (+  0,=  0,-  4),  0.0 %
Fritz 15                      :   1 (+  0,=  0,-  1),  0.0 %
Protej 0.6.3                  :   1 (+  1,=  0,-  0), 100.0 %
Crystal 060622                :   2 (+  0,=  1,-  1), 25.0 %
Berserk 9                     :   2 (+  0,=  0,-  2),  0.0 %
Journeyman 2.1                :   6 (+  0,=  5,-  1), 41.7 %
Fisherov chess monk 1.2       :   2 (+  0,=  0,-  2),  0.0 %
CorChess 210622               :   6 (+  0,=  0,-  6),  0.0 %
Gargantua 1.0                 :   7 (+  1,=  2,-  4), 28.6 %
Smallbrain 4.0                :   7 (+  0,=  3,-  4), 21.4 %
Odonata 0.6.2                 :   6 (+  4,=  2,-  0), 83.3 %


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