100 Headachingly Hard Mate in Two Chess Puzzles Composed by Sam Loyd: Improve Your Ability to Calculate Variations and Finding Checkmate

100 Headachingly Hard Mate in Two Chess Puzzles Composed by Sam Loyd: Improve Your Ability to Calculate Variations and Finding Checkmate

Cognitive Chess: Improving Visualization and Calculation Skills

Blindfold Endgame Visualization: 50 Chess Positions (Blindfold Chess Visualization)