What is the reason that certain seemingly simple problems, like some special Rubic's Cubes, can't be solved? We have to investigate the property known as Parity...
Try the 15 Puzzle online: lorecioni.github.io/fifteen-p...
Our parity proof: "The Sign of a Permutation", Keith Conrad, kconrad.math.uconn.edu/blurbs... Theorem 2.1.
Article about the 15 Puzzle: daily.jstor.org/square-space-...
More on parity: en.wikipedia.org/wiki/Parity_...
Chess Tactic Solution: Ke2(!) en.chessbase.com/post/chessba... (bottom of the page)
Негізгі бет Ғылым және технология About an unintuitive concept that explains unsolvable Puzzles
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