My Stockfish_12_win_x64_avx2 test - an amazing victory !

[Sylwy]

Conditions:
-TC=4'+2"
-Hash=256 MB
-GUI: Arena 3.5.1
-Book: IM_4mvs.abk (8 plies book) for both engines
-default settings for both engines
-1 thread-CPU=Intel i5-7400-3GHz (Kaby Lake)
-6-men Syzygy bases for both engines.

+147 Elo points. Zero defeats !!!

[lkaufman]

This brings up an old issue; a score of 70 wins to 30 losses is an impressive victory but still indicates a somewhat competitive match, while a score of 40 to 0 (with 60 draws) indicates a gross mismatch. Yet they are rated the same. Maybe it's time to try the "WILO" idea, rating only WIns and LOsses, which in this case would give an infinite result, or +640 elo if we give the loser a free point to make it ratable. This is equivalent to rating events in which draws are replayed until someone wins rather than scored as 1/2, which was common until around 1900. It would certainly make progress in computer chess look a lot more impressive!

[Sylwy]

And here is my my Stockfish_12_win_x64_bmi2 test:





+156 Elo points. Zero defeats !

It was expected. I just wanted to see what is the difference between the avx2 and bmi2 binaries on my Intel system. Bmi2 is faster (+9 Elo points).