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Chess engine: Spaghet MariNNara 1.0

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Spaghet MariNNara 1.0 - chess engine based on BBC

This release marks the inclusion of NNUE, with the architecture being (768 -> 2048)x2 -> 1 and trained on Leela data
This release also has improved readability due to my search_stack rewrite

Notable search features include:
Singular Extensions
Multicut
Continuation History
Capture History
Better TT replacement
Estimated CCRL Elo: ~3450 (tested against PlentyChess 0.2.1)

Features to look forward to in the next major release:
Multithreading
Output Buckets
SIMD NNUE inference
The old version of Spaghet fails to make a single draw against this update, so there will be no progtest



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