A stash shared by two heroes loses items or hands out the same item twice

Two characters, two devices or two browser tabs take things from the same chest and save at different times. The last save wins and goods disappear or double. Here is how to merge both changes with the last agreed state, and how to spot the item taken twice.

Why this works

Two people changing the same thing can only be combined if you know what it looked like before either touched it. Comparing each side with that common start shows who removed and who added what, which a plain overwrite cannot tell apart from a harmless unchanged item.

When not to use it

Do not use it when only one place ever changes the stash at a time. A simple lock or a single owner is easier and cannot conflict. It also falls short when items must never be lost on a conflict, such as paid goods: ask a server to decide there.

In the full entry

• What to build, step by step
• Starting values and the reason for each
• 3 common mistakes and the fix
• 24 lines of example code with 3 checks that pass
• How your AI shows you that it works

Say this to your AI

Use the Spielerando entry "A stash shared by two heroes loses items or hands out the same item twice" (read_entry rpg-shared-stash-two-heroes) in my game. Build it step by step, and show me how you checked that it works.

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