The variation in the comment (after 4. .. Nh4+) is easy to foresee but what was really troubling me was the defense 5. ... Ng6. Though white wins in several ways as per tablebase, none of them is obvious to a human solver.
It shows that the issue of 'tablebase wins' existed long before the tablebases. Some analytical lines in endgame studies were provided by authors but ignored by solvers due to complexity. Sometimes you just have to 'feel' your way through parts of a solution to arrive at the other end. Which is exactly what I did.
Hello Chess.com!
Starting with 2016, we will be posting a Weekly Study, courtesy of Yochanan Afek, Grandmaster for composing endgame studies. These challenging positions are designed to stimulate (and improve upon!) your creativity, depth of calculation, pattern recognition and pure imagination.
Z. Birnov, 1957
Enjoy!