Masterstroke (noun)

A clever or skillful action or decision, especially one that achieves a desired result.

Origin:

From master+stroke.

Examples:

1. The company's decision to invest in new technology was seen as a masterstroke, as it helped them to stay ahead of the competition.
2. The chef's decision to add a new dish to the menu was a masterstroke, it became one of the most popular items.
3. The politician's masterstroke was to align himself with a popular cause and gain support from a new base of voters.
4. The athlete's masterstroke was to change his training regimen, which led to significant improvements in his performance.
5. The team's masterstroke was to bring in a new coach, which led to a turnaround in their fortunes.