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Interactive Chess Lab

Free Chess Tactics, Elo Rating & Endgame Calculators

Sharpen board vision, tournament math, and pawn-endgame geometry right in your browser — zero sign-up, zero external scripts, built by Brass Pawn Chess Trainer.

8 Interactive Puzzles

Interactive Chess Tactics Board

Click pieces directly on a responsive 8×8 board to solve 8 verified tactical motifs — Royal Fork, Back-Rank Mate, Pin, Discovered Check, 7th-Rank Skewer, Smothered Mate, Anastasia's Mate, and Deflection.

Solve Tactics Now →

Explore Structured Chess Mastery Hubs

Pair our browser labs with 3,400+ calculation, endgame, and rating-climb study guides:

1,100 Guides
Tactical Motifs →
Forks, pins, skewers & mates
Theoretical Positions
Endgame Mastery →
Lucena, Philidor & opposition
800 → 2200 Elo
Rating Playbooks →
Blunder checks & study plans
iOS Training
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Frequently Asked Questions

Are these interactive chess calculators and boards free to use?

Yes. All three Brass Pawn web tools run 100% locally in your browser on desktop, iPhone, iPad, and Android with zero login or ads.

Which tactical motifs are covered in the Interactive Chess Tactics Board?

You will practice eight foundational tournament motifs: Knight Royal Fork, Back-Rank Mate, Absolute Pin, Discovered Check, 7th-Rank Skewer, Smothered Mate, Anastasia's Mate, and Back-Rank Deflection.

Which K-factors does the Elo Rating Calculator support?

It simultaneously displays rating deltas for K=40 (juniors/new FIDE players under 30 games), K=32 (club/online systems), K=20 (standard FIDE <2400), and K=10 (2400+ masters), plus full multi-game Tournament Performance Rating.

Can I train thousands of puzzles and endgames offline on iOS?

Yes. Download Brass Pawn Chess Trainer on the App Store for offline tactical calculation labs, endgame drills, and adaptive AI sparring.