Chess Daily News by Susan Polgar - Best Chess Training Websites

Grandmaster Guide to Learn and Improve Chess Tactics

Chess Tempo: Chess tactics by Chess Tempo

100 “Clearance” Chess Puzzles for Advanced Players (Rating 1500-1800): 100 real-life chess tactics puzzles to make you a better player (Chess Puzzles, and Tactics - Clearance (Clear the Square)): Puzzles, Mr

Opening training

Chesstempo.com now has an opening trainer : r/chess

Tactics practice on chesstempo

Chesstempo' s exercises - Chess Forums

PDF) Assessing the difficulty of chess tactical problems

Foundational Chess Training - Three Aspects You Need To Know

Mastering tactical motifs : r/chess