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Analysis Bug

I analysed the position. Its FEN is r3k2r/1b1p4/2pPp3/1pP1Pp1r/pP3Pp1/P5Pp/3P3P/4K3 w kq - 0 1
Although it shows -19.7, I can't see any way of progress. Why is it like this? Position looks like simple draw, but it shows here that Black has the advantage.
That is a fortress. The engine evaluates the huge material advantage as -19.7, but there is no way to progress, so it is a draw and should be 0.0. Engines do not recognise fortresses.
Oh, thanks, @tpr I didn't understand that engines doesn't recognize fortresses.
@Mantram_Patel What u couldn't understand just click "TOOLS" and then Analysis Board. Then there is a FEN box. Copy the FEN given above and paste it. And then click Enter. And then u will see the position.
If u r using mobile, then click the menu and then Analysis Board. Then there is a FEN box. Copy the FEN given above and paste it. And then click Enter given on the keyboard. And then u will see the position.

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