Here is the instruction on how to cancel Google Play subscription.
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Step1
Tap the icon and open Google Play Store.
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Step2
Tap "≡" at the upper left of the screen to show Menu.
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Step3
Select "My apps" from Menu
Here, please make sure that the login user name shown at the top of the screen is correct.
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Step4
If you are a premium member, Shogi Wars should show up on the subscription tab.
If subscription is not indicated at the right side, the account may not be correct.
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Step5
Click "cancel" button to cancel.
After cancelling premium, you can still play as a premium member for the rest of the days left.