Today's endgame is from the book 'Just the Facts' by GM Lev Alburt & GM Nikolay Krogius. This instructional tidbit is from chapter 3 where endgame planning is emphasized. 'Just the Facts' is my current lunch book and is more verbal than many of the endgame manuals.
The White King must get to the b7 square before the Black King can stalemate. White must avoid d4 & d6 as these squares allow a drawing Knight fork. There are two paths to b7 and both are illustrated. The variation route f5, f6, e7, d7, c6, b7 takes too long and allows the stalemate. The correct route is d3, c4, c5, c6, b7 and Black cannot get to the stalemate squares.
Everyone learning varies according to the instruction received. I like this book as a review of many endgame principles and some new positions/ideas.