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Add "Best Book Move" UCI option

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Is a boolean option that when set allows Stockfish
to select the best book move across the possible ones.

Feature requested by Salvo Spitaleri.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2010-04-15 15:54:44 +02:00
parent 13431922a3
commit 94bb1964f6
4 changed files with 18 additions and 5 deletions
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18
src/book.cpp
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@@ -399,14 +399,15 @@ const string Book::file_name() { // Not const to compile on HP-UX 11.X
/// Book::get_move() gets a book move for a given position. Returns
/// MOVE_NONE if no book move is found.
Move Book::get_move(const Position& pos) {
Move Book::get_move(const Position& pos, bool findBestMove) {
if (!is_open() || bookSize == 0)
return MOVE_NONE;
int bookMove = 0, scoresSum = 0;
uint64_t key = book_key(pos);
BookEntry entry;
int bookMove = MOVE_NONE;
int scoresSum = 0, bestScore = 0;
uint64_t key = book_key(pos);
// Choose a book move among the possible moves for the given position
for (int idx = find_key(key); idx < bookSize; idx++)
@@ -419,6 +420,17 @@ Move Book::get_move(const Position& pos) {
assert(score > 0);
// If findBestMove is true choose highest rated book move
if (findBestMove)
{
if (score > bestScore)
{
bestScore = score;
bookMove = entry.move;
}
continue;
}
// Choose book move according to its score. If a move has a very
// high score it has more probability to be choosen then a one with
// lower score. Note that first entry is always chosen.