Miraheze Chess Wiki:Reference page

2020 Edition * Unorthodox chess pieces

** ''King is the only piece in the game of chess that cannot be captured. This reference page displays a calculation of the value based on its abilities.''

ELO Formulas
(Note: This reference table is borrowed on Wikipedia.)

Popular opening Books
Source Facts: There are a total of 1,327 openings, but this table displays one of the common/popular openings used worldwide.

Scoring on leftovers
This table displays leftovers on endgame, only, without mates very soon or easily found. The scoring is according to Stockfish 11 and have a margin error of 0.3-0.5%.