http://www.chessanalysis.ee/Quality%20o ... suring.pdf
Relevant to this forum is the section 4.2 on the page 16 which offers a relation between FIDE and CCRL ratings.
Below are comparison tables.
- CCRL 40/40 FIDE 2008 40/90+30
3400 2926
3300 2921
3200 2916
3100 2911
3000 2904
2900 2897
2800 2888
2700 2877
2600 2864
2500 2849
2400 2830
2300 2805
2200 2774
2100 2734
2000 2679
1900 2603
1800 2493
1700 2325
1600 2054
- FIDE 2008 40/90+30 CCRL 40/40
2900 2941
2850 2507
2800 2281
2750 2136
2700 2034
2650 1957
2600 1896
2550 1847
2500 1805
2450 1770
2400 1739
2350 1712
2300 1688
2250 1667
2200 1647
2150 1630
2100 1614
2050 1599
2000 1586
a) it is impossible to have a negative rating on engine rating lists, but easy to achieve in human rating systems
b) rating progress for humans is extremely difficult, but in the world of computer chess we still can expect engines to improve by hundreds of rating points in the near future.
Hence there's no simple linear relationship between the two very different systems. At the bottom, human rating rises at quicker pace than engine rating, whereas at the top the process is reversed; going from 2400 to 3400 is equivalent of merely 100 FIDE rating points.
So I have following questions:
Did you know or at least suspect that the strength-accuracy relationship of engines and humans are of opposite nature?
What are the exact reasons for this phenomenon?