Gbf Poker Helper

GBF Poker Helper

[MOTIVATION]
This extension was built out of personal curiosity while exploring the Granblue Fantasy casino and studying GBF poker strategy guides.

I couldn't find any tool that could both track drawn cards during Double Up and help evaluate which cards to hold during the main hand phase. The standard Double Up advice — bet Higher on anything below 8, bet Lower on anything above — completely ignores cards already removed from the deck. This extension tracks every card seen throughout a session and recalculates the true probabilities in real time, giving you a meaningful edge as the streak progresses. Version 2.0 goes further, adding a full hand evaluation assistant for the deal phase.

[HOW TO USE]
Open Chrome Developer Tools (F12), then select the GBF Poker Helper tab from the panel list. The extension activates automatically when you enter a GBF Poker session.

- Deal phase — The panel displays your 5 dealt cards and recommends which cards to hold, ranked by Expected Value across all 32 possible hold combinations.
- Double Up phase — After each round, the panel shows the real-time probability of drawing Higher, Lower, or Equal based on the cards still remaining in the deck.

[FEATURES]
- Hold recommendations ranked by Expected Value (EV) for all 32 hold combinations
- Supports all hand types: Royal Straight Flush, Five of a Kind, Straight Flush, Four of a Kind, Full House, Flush, Straight, Three of a Kind, Two Pair, One Pair
- Joker handled as a full wild card in both evaluation and EV calculation
- Real-time Higher / Draw / Lower probability display during Double Up
- Full 52-card deck tracking across an entire winning streak
- Automatic deck reset on loss, retire, or new deal
- Activity log showing each card drawn and deck state

[IMPORTANT NOTES]
- Probabilities and EV values are purely mathematical and do not guarantee any outcome.
- During Double Up, probability differences may be small early in a streak. The more cards that have been drawn, the more accurate and useful the information becomes.
- If you have any feedback, comments, or suggestions, feel free to reach out.

[DISCLAIMER]
This extension operates entirely within the Chrome browser layer. It does not modify, inject, or interact with the game in any way — it only reads network response data to perform mathematical calculations. That said, use it at your own risk, as it may fall under the GBF Terms of Service.

[CREDITS]
Icons are a subset of images property of Cygames.

[CHANGE LOG]

[2.0.0]
- New: Hold recommendation assistant for the 5-card deal phase
- Evaluates all 32 hold combinations and ranks them by Expected Value (EV)
- Full hand evaluator covering all 11 hand types with correct Joker wild card support
- EV calculation accounts for the full remaining deck (48 cards after deal)

[1.0.2]
- Fixed bugs, added error handling and improved code
- Added focus card display, cards remaining counter, and per-value deck tracker
- Face cards now shown as A/J/Q/K with numeric value in parentheses
- Deck now resets correctly on max-wins condition (poker_deal)

[1.0.1]
- Initial release
- Tracks drawn cards during the Double Up phase
- Calculates and displays Higher / Draw / Lower probabilities in real time