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Further push singular extension

Extend for an extra half-ply in case the node is (probably)
going to fail high. In this case the added overhead is limited.

A novelity is the way this patch has been tested: Always in
self-play but with a much longer TC to allow the singular
extension to fully kick in and also (my impression) to have
less noisy results.

Ater 1015 games on my QUAD at 60"+0.05
Mod vs Orig 173 - 150 - 692 ELO +8
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1 parent 1b6b711 commit 4c91dbc28e8bb6265f80240de26b8e02f7020a51 @mcostalba committed Oct 2, 2012
Showing with 1 addition and 1 deletion.
  1. +1 −1 src/search.cpp
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2 src/search.cpp
@@ -863,7 +863,7 @@ namespace {
ss->excludedMove = MOVE_NONE;
if (value < rBeta)
- ext = ONE_PLY;
+ ext = rBeta >= beta ? ONE_PLY + ONE_PLY / 2 : ONE_PLY;
}
// Update current move (this must be done after singular extension search)

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