Fortress Sudoku (Daily Sudoku League #67)

Sometime back I posted Poor Neighbours Sudoku as New Sudoku Variation. That time I also created reverse version of this variation and named it as Rich Neighbours Sudoku in which number in the grayed cell is greater (Richer) than its orthogonal Neighbours. During the testing of these puzzles Prasanna   pointed out out that Rich Neighbours Sudoku is nothing but Fortress Sudoku with the only difference that no two greyed cells here does not touch each other. I completely agreed with him and don't want to create a new name to almost similar Sudoku variation. So I am posting this Sudoku as Fortress Sudoku. 
I am posting on Thursday for The League of Extraordinary Ladies and Gentlemen, however today Prasanna is not able to post. May be he is busy in relocation. I am posting on his behalf. This Fortress Sudoku is the only puzzle among my set of puzzles which I have kept reserve for Daily Sudoku League which is tested. All other Sudoku puzzles are still under testing. Hopefully at least one more of my Sudoku will get tested when my turn comes coming Thursday.
This Between Sudoku is my 67th contribution for The League of Extraordinary Ladies and Gentlemen.
Greater Than Consecutive Sudoku (Daily Sudoku League #66) Solution
Greater Than Consecutive Sudoku (Daily Sudoku League #66) Solution

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