Which tiles may be picked in a stacked tile-pairs game, including half-offset ones

A tile may be taken only when nothing lies on it and it can slide out sideways, but tiles sit on half-steps, so a neighbour can block from a corner and a tile above can cover only part of another. This entry shows how to decide cleanly and how to accept a pair.

Why this works

A tile is free when it can be slid out: nothing above it, and at least one side open. Measuring positions in half steps makes partial cover and offset neighbours count, which tiles lined up in exact rows would never show.

When not to use it

Do not trust "free" alone for a layout you made by hand: a board can have free tiles and still be unwinnable. If winning must be guaranteed, build the layout by removing pairs backwards from empty, not by dealing tiles.

In the full entry

• What to build, step by step
• Starting values and the reason for each
• 4 common mistakes and the fix
• A diagram of every state
• 34 lines of example code with 4 checks that pass
• How your AI shows you that it works

Say this to your AI

Use the Spielerando entry "Which tiles may be picked in a stacked tile-pairs game, including half-offset ones" (read_entry stacked-tile-pairs-free-tile) in my game. Build it step by step, and show me how you checked that it works.

Or skip this and connect the MCP: your AI then finds all of this by itself.Connect the MCP