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Move Tempo to evaluation

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Apart from the semplification it is now more clear that
the actual Tempo added was half of the indicated score.
This is becuase at start compute_psq_score() added half
Tempo unit and in do_move() white/black were respectively
adding/subtracting one Tempo unit.

Now we have directly halved Tempo constant and everything
is more clear.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2012-04-09 10:34:17 +01:00
parent 68885f78f3
commit e72b93e44f
2 changed files with 16 additions and 27 deletions
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12
src/evaluate.cpp
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@@ -150,6 +150,9 @@ namespace {
#undef S
// Bonus for having the side to move (modified by Joona Kiiski)
const Score Tempo = make_score(24, 11);
// Rooks and queens on the 7th rank (modified by Joona Kiiski)
const Score RookOn7thBonus = make_score(47, 98);
const Score QueenOn7thBonus = make_score(27, 54);
@@ -362,14 +365,15 @@ Value do_evaluate(const Position& pos, Value& margin) {
Value margins[2];
Score score, mobilityWhite, mobilityBlack;
// Initialize score by reading the incrementally updated scores included
// in the position object (material + piece square tables).
score = pos.psq_score();
// margins[] store the uncertainty estimation of position's evaluation
// that typically is used by the search for pruning decisions.
margins[WHITE] = margins[BLACK] = VALUE_ZERO;
// Initialize score by reading the incrementally updated scores included
// in the position object (material + piece square tables) and adding
// Tempo bonus. Score is computed from the point of view of white.
score = pos.psq_score() + (pos.side_to_move() == WHITE ? Tempo : -Tempo);
// Probe the material hash table
ei.mi = pos.this_thread()->materialTable.probe(pos);
score += ei.mi->material_value();