New chess engine: Stellar 1.4

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Stellar - UCI bitboard chess engine written in C++20
Author: Dimitrije Dobrota

The goal of the project is experimentation. I want to see how far I can push the engine to play better while learning various techniques of optimization.

v1.4:
Improved code quality
Get rid of redundant contexpressions
Big improvement in time management, no more flagging
Pawn hash table for improved speed




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