…if the position is relatively static, players tend to spend more time forming abstract plans than calculating concrete variations, while in a tactical game (such as a sacrificial attack) with many forced moves, they can think up to 10-15 moves ahead.
Coolest moves in the game.
Grandmasters follow many principles which sometimes reduce the amount of Calculations in the game. When the Position is Tactical and lot of forcing moves are compelled they can calculate up to 15-20 moves in different variations.