Visualization Puzzles #2
One of the most important things I did in my childhood without being aware of it was that I would read books, read the variations without a board, and constantly ask myself "why that move?" especially if it seemed to me like a blunder, an illegal move, or completely lacking justification e.g. ...Ra8-a7 when Black has pawns on a6 and b7. Here are some examples of what I mean, from GM William Lombardy's book Understanding Chess.
The game continued 15...fxe6 16. Bh5+ Kf8 17. fxe6 Nc5 18. Qg4 and the author gave 18. Qg4 an exclam. But isn't the queen hanging to the knight on f6?
Medium:From the diagram: 20...d5 21. f6+ Kg8 22. h3! is given an exclam by the author. But why? Isn't 22. Qh6 with Ng5 next a stronger move?
Difficult: Same diagram as medium. 20...d5 21. f6+ Kg8 22. h3 d4 23. Ne4 Ne6 24. Qh6 Bxe4 25. Bxe4 Rb8 26. Nh4 d3 27. Nf5 Kh8 28. Rf4 and Black resigned. Why did Black resign?