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Evaluate one position on a persistent engine, waiting for the result

Source: R/fct_engine_session.R
engine_session_eval.Rd

The counterpart to engine_session_analyse(): a bounded, blocking search for callers that need a number now rather than a stream of improving ones. Scoring the moves of a live game needs exactly that - one figure per position, cheap enough to run as the game goes on.

Usage

engine_session_eval(sess, fen, movetime_ms = 300L)

Arguments

sess

An engine session from engine_session_start().

fen

The position to evaluate.

movetime_ms

Thinking time.

Value

A list with cp (centipawns from the side to move's point of view, mate scores folded onto the same scale), best (best move in UCI) and depth, or NULL if no session or no result.

Details

Give this its own session rather than sharing the board's. The board runs go infinite, and interrupting it here would restart its search and reset its depth on every move of the game.