From: Marco Costalba <mcostalba@gmail.com>
Date: Wed, 18 Aug 2010 14:20:24 +0000 (+0100)
Subject: Store in TT with depth == -OnePly instead of -1
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=4f96f420a33422d3ab09b7a1b9fada9af3d021d7

Store in TT with depth == -OnePly instead of -1

When depth < DEPTH_ZERO we store with the same depth all
the positions, use -OnePly instead of -1 for consistency
with depth arithmetic.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
---

diff --git a/src/search.cpp b/src/search.cpp
index 8c941794..032ff403 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1546,7 +1546,7 @@ namespace {
         return value_mated_in(ply);
 
     // Update transposition table
-    Depth d = (depth == DEPTH_ZERO ? DEPTH_ZERO : Depth(-1));
+    Depth d = (depth == DEPTH_ZERO ? DEPTH_ZERO : DEPTH_ZERO - ONE_PLY);
     ValueType vt = (bestValue <= oldAlpha ? VALUE_TYPE_UPPER : bestValue >= beta ? VALUE_TYPE_LOWER : VALUE_TYPE_EXACT);
     TT.store(pos.get_key(), value_to_tt(bestValue, ply), vt, d, ss->bestMove, ss->eval, ei.kingDanger[pos.side_to_move()]);