Happy Birthday ATK!

Today's Puzzle:

Is a celebration of one year of puzzle setting from Abdul the Killer. He has many more puzzles that deserve a feature.

Enjoy this for today and stay tuned for more from this wonderful constructor!

Link to Play Along:

Happy Birthday by Abdul the Killer https://tinyurl.com/SudokuSleuthHappyBdayATK

Rules:

SHADING: Cells containing values exactly one greater than an immediate neighbour (diagonal or orthogonal) within their box are shaded. All the shaded cells are given.

ANTI-KNIGHT: Cells a knight's move apart cannot contain the same digit.

ALGEBRA: Each letter represents a different digit.

Otherwise standard Sudoku rules apply.