Bianchi Classification modifications for 2020

The decline of the Bianchi over the last few years means running 5 classes is very hard to justify. The GRSB/GRCF will move to 3 classes in 2020 with the breakpoints as below.

Bianchi

Class GRSB GRCF LBP LBR
X 1865-1920

1836-1920

1895-1920

1890-1920

1895-1920 1825-1920
A 1811-1864

1701-1835

1855-1894

1801 – 1889

1750-1894 1750-1824
B 1746-1810

up to 1700

1815-1854

up to 1800

up to 1749 up to 1749
C 1600-1745 1725-1814
D up to 1599 up to 1724

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