So the survivors of round 1 progress to round 2, divided into three heats as follows:

Cyrano
Defenchess_2.2
Ethereal 20191110
andscacs

Fire_7.1_x64
Fruit-2-3-1-Linux
critter-16a-64bit
demolito

stockfish
laser
xiphos-0.6-linux-sse
arasanx-64
texel64

The third group is probably the strongest, with three strong engines.