User-agent: *

# Block only individual tender detail pages (you probably don't want thousands of single tender pages indexed)
Disallow: /tender-details
Disallow: /tender-details?tender=*

# Allow all important listing pages
Allow: /tenders/published-tenders
Allow: /tenders/published-tenders?*
Allow: /tenderers
Allow: /procuring-entities

# Optional: If you want to be extra safe and block other tender sub-pages
Disallow: /tenders/
Allow: /tenders/published-tenders
Allow: /tenders/published-tenders?*