Chess

Endgame

The Secret of Improvement
Outside Passed Pawn
Pendulum
Philidor position
Stalemate

Mating Patterns

Back-Rank Mate
Boden's Mate
Swallow-Tail
Teresa

Tactical Patterns

Interference
Pawn Promotion

Chess puzzles

Mate in Two
Tactical Problem 1
Endgame Problem 1
Endgame Problem 2

Openings

Avoiding the four-move checkmate

Chess Book Recommendations

Chess Book Recommendations by Chris Smith