Here is a chess puzzle composed by Russian chess composer V. Novikov. After inserting the puzzle and waiting for 20 minutes Stockfish 8 still could not solve it!
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Music credit:
Laid Back Guitars by Kevin MacLeod is licensed under a Creative Commons Attribution license (https://creativecommons.org/licenses/…)
Source: http://incompetech.com/music/royalty-…
Artist: http://incompetech.com/