Type Definition alcibiades::Depth
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type Depth = i8;
Search depth in half-moves.
A value of this type can be interpreted in two ways:
Remaining search depth.
The remaining search depth tells how many half-moves should be added to the current line of play before a leaf node is reached. Usually, searches are started with some positive number as their remaining search depth. This number is decremented when a move is tried, and the search routine is called recursively. When the remaining depth becomes zero (or less), a leaf node has been reached and a quiescence search is performed to obtain reliable evaluation. Sometimes depth reductions are applied for less interesting moves. This means that the remaining search depth is decreased by more than one. Thus, if such reductions are applied near leaf nodes, the remaining search depth may become negative.
Completed search depth.
The completed search depth tells the depth in half-moves to which a position has been analyzed. Negative values are possible, meaning that a quiescence search with a negative remaining search depth has been executed for the position.
Limits:
DEPTH_MAXis the maximum allowed search depth in half-moves (a positive number).DEPTH_MINis the minimum allowed search depth in half-moves (a negative number).