Dimension scores are derived from public data and fields; weighted into the composite. Reference only.
DecodeChess is an online AI chess tutor from Decodea Ltd. Its core goal is not to replace Stockfish, but to explain the “why” behind the moves recommended by Stockfish NNUE. It brings Explainable AI into chess analysis, presenting threats, plans, tactical motives, piece roles, and positional concepts in natural language. It is positioned as a self-study review tool for players below ELO 2000.
The product offers two types of analysis: Decode Game and Deep Decode. The former generates brief explanations for an entire game, while the latter provides a 360-degree deep analysis of a single position, covering opponent threats, ranked best moves, future plans, key concepts, piece responsibilities, and the reasons behind mistakes or suspected inaccuracies. Its Idea-Problem-Solution approach is better suited to building understanding than traditional engine scores. It also supports human-like computer opponents, analysis while playing, game graphs and key-position recommendations, as well as PGN/FEN uploads.
The free plan allows 1 game Decode per day and supports playing against the computer, but does not include position Decode, deep explanations, or 1.5x computing power. The Unlimited subscription costs $8.25/month or $84/year, and includes unlimited position and game Decode, deep explanations, and a 7-day money-back guarantee. One-time credit packs are also available: $15 for 60 Credits and $25 for 120 Credits, valid for 12 months with no refunds.
Its strengths are detailed explanatory dimensions and learner-friendly language, turning engine recommendations into something close to coach-style commentary. It is very useful for reviewing large volumes of online games, identifying weaknesses, and understanding complex middlegame positions. The downsides are that the free plan is fairly limited, some features are unavailable on mobile, and there is no visible support for Chinese or an API. Its privacy policy states that analysis outputs belong to Decodea and may be stored, copied, shared, or publicly used, so users who care about game-record privacy should be cautious.
It is best suited to players below ELO 2000 who struggle to understand engine lines and evaluation scores, and it can also help coaches explain positions. There is no clear statement on access from mainland China. Payments are supported via credit card, debit card, and PayPal, so users in China may need to verify network connectivity and payment availability themselves. Alternatives include Lichess Analysis, Chess.com Game Review, local Stockfish analysis, ChessBase, and Aimchess.
⚠ This review is compiled from public sources and does not constitute a purchase recommendation. Verify all facts on the vendor's official site. Verify on decodechess.com official site.
decodechess.com is an Israel AI Apps provider. TG4G tracks its product information, an overall rating of 7.0/10, and a China-accessibility score of Workable. Click "Visit Official Site" to reach decodechess.com directly.