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Cannot drop, your card needs to be one rank lower
Cannot move multiple cards to foundation
Card suit doesn't match foundation pile suit
Card can only be dropped on top of a card pile
Cannot deal cards when there are empty tableau piles
You can only move {0} card(s) at a time based on the current free cells and tableau
The cards don't add up to 13 and cannot be moved
The card is inaccessible and move cannot be performed
Cards must be in sequential order (one higher or lower)
Tilastot

About Stoyan Shopov
Stoyan Shopov is the driving force—and steady hand—behind the competitive solitaire scene at solitairex.io. For more than a decade he has blended elite‐level gameplay with deep software craftsmanship to push the boundaries of what a single‑player card game can be.
A Track Record of Solitaire Mastery
- Professional competitor: Stoyan has logged tens of thousands of timed runs across Klondike, Spider, FreeCell, Pyramid, Forty Thieves, and dozens of original variants. His personal‑best clear times consistently rank in the top percentile of global leaderboards on major online platforms.
- Variant designer & historian: Fascinated by rule evolution, he has reconstructed obscure nineteenth‑century layouts and invented modern hybrids—many of which debut exclusively on SolitaireX.io.
- Theory meets practice: Stoyan’s in‑depth probability studies and move‑count heatmaps have become reference material for speed‑runners and casual players alike. Several strategy articles he published still sit at the top of search results for phrases like “minimum‑move Spider” and “perfect‑play Klondike foundations.”
Engineering the Cards
- Full‑stack architect: A senior .NET and C# engineer, Stoyan built the real‑time scoring engine that powers SolitaireX.io’s live tournaments, capable of processing tens of millions of moves per day with millisecond latency.
- AI solver developer: His open‑source Monte‑Carlo and heuristic search solvers analyze billions of positions to surface winnable seeds, generate hint systems, and benchmark human play.
- Performance first: From GPU‑accelerated animations to progressive‑web‑app offline caching, every technical decision serves a single goal—keeping gameplay smooth at 60 FPS even on low‑end devices.
Teaching & Community
- Microsoft Certified Trainer: Stoyan has mentored 2,000+ engineers in advanced .NET, Azure cloud patterns, and game‑dev fundamentals, translating complex concepts into practical labs.
- Content creator: On the SolitaireX.io blog he breaks down code architecture, shares behind‑the‑scenes design notes, and publishes monthly “State of the Deck” reports that analyze player data trends.
- Open‑source steward: His GitHub repositories host everything from Unity card animations to benchmarking harnesses; pull‑requests are reviewed with the same precision he brings to tournament play.
Why Follow Stoyan?
If you’re chasing a sub‑90‑second Klondike, researching optimal tableau heuristics, or architecting a scalable card‑game backend, Stoyan’s insights will shorten your learning curve. He lives at the intersection of cards, code, and competition—and he’s eager to share the lessons dealt to him by millions of shuffles.
“Every deal is a dataset, every move a hypothesis. Master solitaire, and you master the art of systematic problem‑solving.” — Stoyan Shopov
Connect with him on LinkedIn or dive into the code at GitHub/StoyanShopov.
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