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This E-DVD Art of Calculation with IM Andrey Ostrovskiy is a 3+ hour chess course focused on improving calculation and avoiding costly miscalculations.
IM Andrey Ostrovskiy shares his exact calculation methodology and blueprint, developed and refined over more than 16 years. The course is designed to help club-level players reduce blunders, spot better moves, and make stronger decisions over the board.
If you want to build a stronger tactical foundation, this title belongs in your chess study lineup alongside other resources in Accessories > Chess Books.
You may also be interested in related study material like Dvoretsky's Endgame Manual – 6Th Edition - Hardcover and E-Dvd - Queens's Gambit Declined - Tarrasch - Chess Lecture - Volume 80.