I Am Surprised That Stockfish 10 Managed To Form A Fortress

In this video I am testing Stockfish 10 with a chess puzzle composed by Czech chess composer Josef Hasek! The solution requires to build a fortress, and taking into consideration the fact that engines are unable to understand fortresses I thought that Stockfish 10 would fail to come near to the solution! But surprisingly, very quickly Stockfish 10 not only found the rook sacrifice, but also the "fortress idea"!
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Josef Hašek
Československý šach (4-5/24) 1937-04
2nd Prize, White to draw
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The puzzle in Forsyth-Edwards Notation (FEN): r7/7k/5R2/p3p3/Pp1pPp2/1PpP1Pp1/K1P3P1/8 w - - 0 1

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