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Reword singular extension comments

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Should be more stick to original definition (Hsu, Campbell)

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2010-07-06 10:08:35 +02:00
parent 8689ff7d03
commit aa172032c4
1 changed files with 5 additions and 4 deletions
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9
src/search.cpp
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@ -1280,9 +1280,10 @@ namespace {
// Step 11. Decide the new search depth
ext = extension<PvNode>(pos, move, captureOrPromotion, moveIsCheck, singleEvasion, mateThreat, &dangerous);
// Singular extension search. We extend the TT move if its value is much better than
// its siblings. To verify this we do a reduced search on all the other moves but the
// ttMove, if result is lower then ttValue minus a margin then we extend ttMove.
// Singular extension search. If all moves but one fail low on a search of (alpha-s, beta-s),
// and just one fails high on (alpha, beta), then that move is singular and should be extended.
// To verify this we do a reduced search on all the other moves but the ttMove, if result is
// lower then ttValue minus a margin then we extend ttMove.
if ( singularExtensionNode
&& move == tte->move()
&& ext < OnePly)
@ -1297,7 +1298,7 @@ namespace {
Value v = search<NonPV>(pos, ss, b - 1, b, depth / 2, ply);
ss->skipNullMove = false;
ss->excludedMove = MOVE_NONE;
if (v < ttValue - SingularExtensionMargin)
if (v < b)
ext = OnePly;
}
}