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Play With Theory

AI chess coach and opening trainer

Turn positions into plans.

Get clear plans, practical explanations, and focused training built around the positions you struggle with.

See how it works

Start with a prepared White and Black repertoire. Create an account to keep your progress across devices. Compare Free and Pro

Play With Theory AI explanation beside the exact chess position and engine line
AI explanation with engine lineSee the position, engine line, and AI explanation together.

Opening training

Start with a plan, or choose where it begins.

Opening Foundations is already ordered for you. Start it as built, or pick the opening you want to study first.

Browse the public opening guides
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Coach Hub

For human chess coaches

See what your players worked on between lessons.

Players train in Play With Theory. With their approval, you can review recent sessions, opening recall, skill change, and current focus before the next lesson.

Ask about the pilot

Limited pilot. Read-only access begins only after learner approval and can be revoked at any time.

Learn the plan. Find the move. Review what you miss.

Each lesson starts from a real position. After the explanation, find the move from memory. Positions you miss return for review.

Explore all chess training modes

Position 18

Learn this position, then test it.

See the plan · find the move · review it later
  1. Learn

    Understand the plan

    See why the move works and what the position calls for.

  2. Practice

    Find the move yourself

    Play the critical branch from memory without the engine line.

  3. Review

    Fix what you missed

    Wrong or uncertain answers bring the position back sooner.

  4. Improve

    Spend time where it helps

    Strong positions wait while weak lines move to the front.

Free and Pro

The same complete system. More coach analyses when you need them.

Free includes every training feature and five Deep Coach analyses each week. Pro keeps the same complete system and raises the allowance to 25 each week.

Compare Free and Pro

Opening Foundations is ready

Begin with the first lesson.

Your White and Black repertoire is prepared. Train as a guest and save your progress when you are ready.