Reconnaissance Blind Chess vs FPV Guidebook
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Reconnaissance Blind Chess
This app offers a unique chess variant where players cannot see their opponent's pieces. Utilize private sensing actions to gather information and strategize your moves. Compete in ranked or unranked games against AI bots.
- Imperfect information gameplay
- Private sensing actions
- Ranked and unranked game modes
- AI bot opponents
- Capture-based win condition
- Time-based win condition
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The Reconnaissance Blind Chess (RBC) variant was invented in 2015 at JHU/APL as an experimentation platform to study artificial intelligence (AI). RBC includes imperfect information, long-term strategy, explicit observations, and very little common knowledge between opponents. In the RBC variant, the opponents cannot see each other’s pieces but can learn about them through private, explicit sensing actions. In unranked RBC games, the player plays with a guest account. They choose their opponent from a list of available bots and select their color (white or black). An unranked RBC game will not affect the player's rating. In ranked RBC games, the player logs in with their RBC account credentials, and their opponent and color are chosen at random. It may take a few seconds to be matched up against an opponent. A ranked RBC game will affect the player's rating. Game Rules: Reconnaissance Blind Chess (RBC) was intentionally designed to keep the game as close to traditional chess as possible while adding an appropriate amount of uncertainty and explicit sensing. RBC is like chess but includes the following core differences: A player cannot see their opponent's pieces. Prior to making each move, a player selects a 3×3 region of the chess board (via green outline on the relevant squares) to “sense” the pieces in that region. The player is informed of the true piece configuration within the sensed 3×3 region. The opponent is not informed about where the player sensed. When a player captures a piece, they are informed (via red outline on the relevant square) that they made a capture, but they are not informed about what piece they captured. When a player's piece is captured, they are informed (via red outline on the relevant square) that their piece was captured, but they are not informed about what piece captured it. There is no notion of check or mate because neither player can be definitively aware of any check relationship. A player wins by capturing the opponent's king or when the opponent runs out of time. Each player begins with a cumulative 15-minute clock to make all their moves. If a player tries to move a sliding piece through an opponent's piece, the opponent's piece is captured and the moved piece is stopped where the capture occurred. The moving player is notified of the square where the piece landed (via red outline on the relevant square), and both players are notified of the capture in the manner stated above. If a player attempts to make an illegal move, such as a pawn diagonally to an empty square, or a pawn forward to an occupied square, or a castle through an interposing piece, they are notified that the move did not succeed and their turn is over. However, castling through check is allowed because the notion of check is removed. There is a "pass" option that a player can select if they prefer to make no move during their turn. A player has access to reserve pieces that they can drag on and off the board to better visualize the state of the board, based on their belief of where their opponent's pieces are located. The turn tracker informs the player when it is their turn to sense and move, and when it is the opponent's turn.
FPV Guidebook
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FPV Guidebook is your go-to reference app for FPV drone pilots. From beginners building their first quad to experienced racers tuning for performance, everything you need is in one place. COMPONENT LIBRARY Browse a curated catalog of motors, flight controllers, ESCs, cameras, VTX, and more. Each component includes specs, compatibility notes, and expert guidance to help you choose the right parts for your build. COMMUNITY Q&A Ask questions and get answers from real FPV pilots. Post a question on any component page and get insights from the community. Because sometimes the best advice comes from someone who's already flown it. FPV AI ASSISTANT Ask any FPV question and get an instant answer powered by AI. Troubleshoot a build, compare components, or learn new techniques. All without leaving the app. FLYING SPOTS MAP Discover legal and community-approved flying locations near you. Find spots suited for freestyle, racing, or cinematic flights. GUIDES & TECHNIQUES Step-by-step soldering guides, firmware setup walkthroughs, and build tutorials. All illustrated and written for FPV pilots. WORKS OFFLINE Your bookmarks and recent searches are available without an internet connection. PRO SUBSCRIPTION Access the component catalog, FPV AI assistant, and all premium features with FPV Guidebook Pro, €12.99 + local taxes per year. Built by pilots, for pilots. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is in-app purchases: Reconnaissance Blind Chess at none against FPV Guidebook's 1. FPV Guidebook's advantage is update cadence (every 3 weeks vs every 32 months). On price, ads, device support and iOS requirement there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. FPV Guidebook sells 1 in-app purchase, starting at $11.99 per year. Reconnaissance Blind Chess asks for nothing beyond the download.
Reconnaissance Blind Chess ships an update every 32 months, FPV Guidebook every 3 weeks. The most recent releases landed on October 23, 2026 and October 11, 2026 respectively.
| Parameter | Reconnaissance Blind Chess | FPV Guidebook |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (4 ratings) — better | — |
| Number of ratings | 4 — better | — |
| Update frequency | Every 32 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 14.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 22 MB | 59 MB |
| Age rating | 4+ | 4+ |
| Developer | Johns Hopkins University Applied Physics Laboratory | Curtis Noland |
In-app purchases
Reconnaissance Blind Chess
No in-app purchases
FPV Guidebook
- FPV Guidebook Pro$11.991 Year
Questions
Is Reconnaissance Blind Chess free?
Is FPV Guidebook free?
Do Reconnaissance Blind Chess or FPV Guidebook have ads?
Which is updated more often, Reconnaissance Blind Chess or FPV Guidebook?
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