Masterstroke

n.capable, energeticwarm

What it means

A brilliantly judged action or idea that has an unusually strong effect.

Reach for it when praising one decisive choice within a strategy, design, or performance

Moving the entrance beside the garden was a masterstroke of practical design.

playful
smart touch
for a small addition that improves the whole result
not when The casual phrase understates a decisive, high-skill intervention.
everyday
brilliant move
for a smart decision with clear strategic benefit
not when Brilliant move can sound competitive and may ignore patient collaborative work.
everyday
winning idea
when an idea succeeds clearly with its audience or purpose
not when Winning can sound promotional and says little about why the idea works.
warm
inspired choice
when creative judgment seems especially apt
not when Inspired can hide the evidence and labor that led to the choice.
warm
stroke of genius
when an inspired idea appears exceptionally original and effective
not when The phrase is extravagant for a sound choice reached through ordinary analysis.
professional
decisive move
when timing and consequence matter more than originality
not when A decisive move can be necessary without being ingenious.
professional
strategic triumph
when one decision materially secures the larger objective
not when Triumph overstates a useful move before its long-term results are known.
formal
coup
when a surprising success gives a strong advantage or wins prestige
not when Coup implies competition and can sound aggressive or political.

design masterstroke
The shaded courtyard proved to be a design masterstroke in summer.
political masterstroke
The joint announcement was described as a political masterstroke.
prove a masterstroke
Keeping the old staircase would prove a masterstroke once the building reopened.

The definition and the example on this page are written here. The dictionaries above ground which meaning is being described, not the wording.