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Extract only exact scores to get the PV

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This should allow to skip overwritten nodes because
only in PV we store in TT with VALUE_TYPE_EXACT flag.

Test result for the whole series is:

After 3627 games at 5"
Mod vs Orig +1037 =1605 -985 +5 ELO

After 1311 games at 1'+0"
Mod vs Orig +234 =850 -227 +2 ELO

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2010-06-27 15:13:22 +01:00
parent 62c68c2d21
commit 5c3ebd1fbf
1 changed files with 3 additions and 1 deletions
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4
src/tt.cpp
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@ -197,9 +197,11 @@ void TranspositionTable::extract_pv(const Position& pos, Move bestMove, Move pv[
pv[ply] = bestMove;
p.do_move(pv[ply++], st);
// Try to add moves from TT while possible
// Extract moves from TT when possible. We try hard to always
// get a ponder move, that's the reason of ply < 2 conditions.
while ( (tte = retrieve(p.get_key())) != NULL
&& tte->move() != MOVE_NONE
&& (tte->type() == VALUE_TYPE_EXACT || ply < 2)
&& move_is_legal(p, tte->move())
&& (!p.is_draw() || ply < 2)
&& ply < PLY_MAX)