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Use increased LMR horizont also in PV search 

Tord says that using a lower horizon at PV nodes
looks strange and inconsistent with the general
philosophy of our search (i.e. always being more
conservative at PV nodes). So set LMR at 3 also
on search_pv().

Test result after 601 games seems to confirm this.

Mod vs Orig +156 =318 -127 52.41%  315.0/601  +17 ELO

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
sf_2.3.1_base
Marco Costalba 2009-07-17 17:07:45 +01:00
parent 620cfbb676
commit 15eb59683e
1 changed files with 1 additions and 1 deletions
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src/search.cpp
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@ -1080,7 +1080,7 @@ namespace {
{
// Try to reduce non-pv search depth by one ply if move seems not problematic,
// if the move fails high will be re-searched at full depth.
if ( depth >= 2*OnePly
if ( depth >= 3*OnePly
&& moveCount >= LMRPVMoves
&& !dangerous
&& !moveIsCapture