Chess engine: Greko 2021.06

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Greko - UCI chess engine, Author: Vladimir Medvedev 
Rating JCER=2659

GreKo 2021.06 (01-06-2021):
Test match with 2021.05, time control 3+.2:
+338-260=402, +25 Elo points

- Use compiler intrinsics for bitboard operations.
- Use 64-bit int internal representation of time.
- Use 16-bit float internal representation of eval.
- Windows compiler update: TDM/MinGW GCC 9.2.0.
- Added solution and project files for MSVC 2019.
- More precise time measurement in Linux.
- Tuned parameter for null-move reduction.
- Re-implemented easy levels with fixed search speed.

Greko 2021.06 - download

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