2.0
Progress
20+0.2 on a BMI2+AVX machine:
Score of 2.0 vs 1.9: 295 - 165 - 740 [0.554] 1200
Elo difference: 37.79 +/- 12.11
60+0.6 on a POPCNT/SSSE3 machine:
Score of 2.0 vs 1.9: 521 - 202 - 1277 [0.580] 2000
Elo difference: 55.9 +/- 9.0
Not bad but probably far less on modern PC with longer time control and against different opponents.