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Fix an off-by-one bug in extract_pv()

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In case we reach ply == PLY_MAX we exit the function
writing

pv[PLY_MAX] = MOVE_NONE;

And because SearchStack is defined as:

struct SearchStack {
  Move pv[PLY_MAX];
  Move currentMove;
  .....

We end up with the unwanted assignment

SearchStack.currentMove = MOVE_NONE;

Fortunatly this is harmless because currentMove is not used where
extarct_pv() is called. But neverthless this is a bug that
needs to be fixed.

Thanks to Uri Blass for spotting out this.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2009-10-09 10:04:55 +01:00
parent d892063cd3
commit 06a5b602dc
3 changed files with 4 additions and 4 deletions
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2
src/search.h
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@@ -48,7 +48,7 @@ const int KILLER_MAX = 2;
/// current ply.
struct SearchStack {
Move pv[PLY_MAX];
Move pv[PLY_MAX_PLUS_2];
Move currentMove;
Move mateKiller;
Move threatMove;