* China blue chips up 6 pct, best day since July 2015
* China’s yuan hits seven-month high
* Czech crown nears five-week peak
By Susan Mathew and Aaron Saldanha
Feb 25 (Reuters) – Emerging-market shares surged on Monday, led by the biggest one-day gains for Chinese stocks in more than three years, after U.S. President Donald Trump extended a deadline for China and the United States to reach a trade agreement.
Trump’s decision came