Third Base 21 Blackjack Trainer

Transparent product history

Third Base Changelog

A dated record of meaningful changes to the trainer, public learning material, testing, and site operations.

Last updated: 29 August 2026

29 August 2026 — strategy calculator expanded

  • Added a rule-aware explanation for every hit, stand, double, and split result.
  • Added shareable URLs that preserve the selected hand, dealer card, deck count, S17/H17 rule, and available actions.
  • Added supported deck context, four verified worked examples, and explicit limits for unsupported EV and rule calculations.
  • Added automated coverage for shared-result parsing, example decisions, and unavailable-action fallbacks.

9 August 2026 — learning library expanded

  • Published rule-specific guides for basic strategy, hard hands, soft hands, pairs, S17/H17, card counting, Hi-Lo, running versus true count, and deck estimation.
  • Published an accessible full strategy chart and an interactive two-card strategy calculator.
  • Added a beginner rules guide with the trainer’s exact table assumptions.
  • Connected guides through topic-based internal navigation and the XML sitemap.

9 August 2026 — quality and verification

  • Expanded automated strategy coverage to complete hard-, soft-, and pair-decision matrices.
  • Verified public pages for unique titles, descriptions, canonicals, headings, HTTP responses, and internal links.
  • Checked responsive layouts at a 390-pixel viewport and ran Lighthouse audits.
  • Submitted the expanded sitemap to the verified Google Search Console domain property.

9 August 2026 — trust and transparency

  • Published About, Contact, Privacy, Terms, Editorial Policy, Responsible Gambling, and Methodology pages.
  • Documented local storage, visit measurement, retention periods, leaderboard behaviour, and the absence of advertising cookies before AdSense activation.
  • Added independent support resources and made the educational, no-real-money scope prominent.

9 August 2026 — technical foundation

  • Established one canonical HTTPS host with redirects for alternate host and index URLs.
  • Published robots.txt, an XML sitemap, canonical metadata, social metadata, and SoftwareApplication structured data.
  • Optimised key images and fonts, enabled modern delivery and caching, and added security headers.
  • Verified both URL-prefix and domain properties in Google Search Console.

How updates are recorded

This page covers changes that affect users, content accuracy, privacy, accessibility, or discoverability. Tiny copy edits and routine maintenance may be grouped. Strategy corrections will identify the affected rule or decision rather than being silently rewritten.

Report a suspected problem through the options on the Contact page. The project’s evidence and review standards are described in the Editorial Policy.