Glossary#

This glossary defines terms used across the engine docs. Feature pages link here and define only the terms specific to their topic.

Term	Meaning
Board	The playfield, a grid of occupied and empty cells. Two boards are identical when every cell matches. In the shipped ruleset, the grid is 10 cells wide.
Bag	The shuffled set of mino types a player draws from: each type appears once before any repeats. A new bag starts when the previous one is exhausted.
Roof	The height of the tallest stack. Every row above it is empty.
Placement	Dropping the current piece, or the held piece, at a specific position and orientation, along with any resulting line clears.
Evaluation	A number the AI assigns to a board in the situation the placement is made from, measuring how good it is.
Depth	How many pieces into the future a position is. Depth 0 is the current move.
Horizon	How far ahead the search looks. It covers the known piece queue and, when only one piece of the current bag is still unseen, that piece too (see Bag deduction).
Hold	The one-piece stash a player can swap the current piece into.
Status	The AI's running assessment of a search path. It combines the evaluation with context gathered along the way, such as line clears, combo, and back-to-back, into one value for comparison.
Search budget	A count that sets the beam size for one search decision. It is not a time limit, which keeps searches reproducible.

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