-Hash=256 MB
-GUI: Arena 3.5.1
-Book: Perfect_2010.abk (for Koivisto_6.0-x64-windows-avx2) and own TestBook.scb (for SlowChess Blitz 2.6 x64-avx)
-default settings for both engines
-1 thread-CPU=Intel i5-7400-3GHz (Kaby Lake)
-TBS: 6-men Syzygy bases for both engines + EndgameBitbases.sbb+NeuralNets.snn for SlowChess Blitz 2.6 x64-avx
-OS: Windows 10 Home.
SlowChess Blitz 2.6 x64 has 3474 Elo points (CCRL Blitz).
Expected rating for Koivisto_6.0-x64-windows-avx2 is around 3509 Elo points. +156 Elo points face to Koivisto 5.0 x64 (in my single match test). A top 5 engine (just my opinion).
Koivisto 5.0 x64 has 3353 Elo points (CCRL Blitz).
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Next: Berserk-4.5.1-x84-pext. A formidable chess engine.