Game guide · SHOUJIKON
Play Gin Score Calculator with the rules at hand
For a calm first round, focus on one decision. Calculate a Gin hand score from the knocker’s and defender’s final deadwood totals. Check the relevant controls before continuing. Keep the active rule in mind. Enter the knocker’s deadwood from 0 to 10. Zero means Gin. Check the relevant controls before continuing.
Fixed house bonuses of 25. It does not include line bonuses or a match-end bonus.
Something to practise
Treat this as a chance to practise one rule. Enter the defender’s deadwood after any legal layoffs; against Gin no layoff is allowed. Take the next action only when the current step is clear.
What counts as success
Calculate a Gin hand score from the knocker’s and defender’s final deadwood totals. The same rule applies on a phone and on a computer. Work at your own pace.
From the start of a round
- Enter the knocker’s deadwood from 0 to 10. Zero means Gin.
- Enter the defender’s deadwood after any legal layoffs; against Gin no layoff is allowed.
- Calculate the result. Gin scores 25 plus defender deadwood; an undercut scores 25 plus the difference.
- For an ordinary successful knock, the knocker scores only the positive difference.
Choosing and moving on screen
Use the two numeric fields, then Calculate score. This tool uses whole numbers. Use another round to revisit a decision. Work at your own pace.
An example to follow
A knock of 8 against 5 is an undercut: the defender receives 28. Gin against 18 earns the knocker 43. Use another round to revisit a decision.
Pay attention to this rule
Treat this as a chance to practise one rule. Enter post-layoff values. This arithmetic tool does not choose card groupings from card images. The same rule applies on a phone and on a computer.
Game-specific help
What is the aim?
Calculate a Gin hand score from the knocker’s and defender’s final deadwood totals. A clear plan starts with the current position. Check the relevant controls before continuing.
How do I use the controls?
Use the two numeric fields, then Calculate score. This tool uses whole numbers. Work at your own pace. Use another round to revisit a decision.
Which format is available?
Fixed house bonuses of 25. It does not include line bonuses or a match-end bonus. Before making a move, check the cards in view. Return to the explanation when a decision is unclear.
What should I check before a move?
Enter post-layoff values. This arithmetic tool does not choose card groupings from card images. Keep the active rule in mind. Return to the explanation when a decision is unclear.
Can you give an example?
A knock of 8 against 5 is an undercut: the defender receives 28. Gin against 18 earns the knocker 43. Look at the complete hand before deciding. The same rule applies on a phone and on a computer.
How is a tie scored?
A non-Gin deadwood tie is an undercut, so the defender receives 25 points. For a calm first round, focus on one decision. Check the relevant controls before continuing.
Can I use other Gin bonus values?
This calculator uses the same 25/25 values as this site’s Gin table. Begin with the objective. Check the relevant controls before continuing.
Does it automatically lay off cards?
No. Enter the defender’s final value after layoffs. The playable Gin table performs card-based layoff analysis. Treat this as a chance to practise one rule. The same rule applies on a phone and on a computer.
Do I need an account or an app?
No. Open the page in a JavaScript-enabled browser. No player account or APK is needed. Use the rule sheet as a reference. Check the relevant controls before continuing.
Are these scores cash or prizes?
No. Points are used only for free play and practice. There are no deposits, cash stakes or withdrawals. Take a moment to read the table. Take the next action only when the current step is clear.
