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Chess engine: Viridithas 15.0.0

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Chess engine: Viridithas   Author:Cosmo
Rating Chess Engines Diary CEDR=3662

v.15.0.0:
This release brings a network trained with the new, highly-advanced rewrite of the Bullet neural network trainer.

Upgrades, in chronological order:
Significantly improve SIMD code quality (#185)
Add binpack subsampling (#187)
New network, ID lila (#188)
Use FT_SHIFT of 9 instead of 10 (#189)
Make inference robust across architectures (#190)
Fused NNZ Computation (#191)
Propagate L1 two-at-a-time (#192)
Unroll feature transformer two-at-a-time (#193)
Only cut via SNMP under some conditions (#194)
Use a linear history bonus (#196)
Add a range of additional correction histories (#197)
Speculatively force accumulator materialisation for some positions (#198)
Use 2-back improving with guarding for checks (#199)
Simplify the movepicker (#202)
Use history to modify SEE pruning margin (#203)
Remove the guard on history LMR (#204)
New network, ID voyager (#205)
Use threefold repetition instead of twofold (#206)
Elo comparison against v14.0.0
STC:

Elo   | 35.28 +- 6.86 (95%)
Conf  | 8.0+0.08s Threads=1 Hash=16MB
Games | N: 3004 W: 917 L: 613 D: 1474
Penta | [11, 251, 704, 495, 41]
https://chess.swehosting.se/test/8737/
LTC:

Elo   | 43.51 +- 6.42 (95%)
Conf  | 60.0+0.60s Threads=1 Hash=128MB
Games | N: 3002 W: 939 L: 565 D: 1498
Penta | [3, 206, 737, 524, 31]
https://chess.swehosting.se/test/8736/
(D)FRC:

Elo   | 33.88 +- 5.97 (95%)
Conf  | 60.0+0.60s Threads=1 Hash=128MB
Games | N: 3004 W: 624 L: 332 D: 2048
Penta | [2, 181, 876, 409, 34]
https://chess.swehosting.se/test/8738/



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