From 74fd57220e4e5a214761adc2d12335a12bef56f3 Mon Sep 17 00:00:00 2001 From: Marco Costalba Date: Mon, 27 Oct 2008 09:28:14 +0100 Subject: [PATCH] Refine "few moves" in "last minute surprise" It seems that "few moves" works because we extend the good captures at the last ply of PV, so code it directly. This version seems defenitly stronger then previous one. Signed-off-by: Marco Costalba --- src/movepick.h | 6 +----- src/search.cpp | 4 ++-- 2 files changed, 3 insertions(+), 7 deletions(-) diff --git a/src/movepick.h b/src/movepick.h index 66518ac7..5a388261 100644 --- a/src/movepick.h +++ b/src/movepick.h @@ -7,11 +7,7 @@ it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. -<<<<<<< HEAD:src/movepick.h -======= - ->>>>>>> d3600c39a745179ed6b094b305d0645e83a1ee86:src/movepick.h Stockfish is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the @@ -54,7 +50,7 @@ public: PH_TT_MOVE, // Transposition table move PH_MATE_KILLER, // Mate killer from the current ply PH_GOOD_CAPTURES, // Queen promotions and captures with SEE values >= 0 - PH_BAD_CAPTURES, // Queen promotions and captures with SEE valuse <= 0 + PH_BAD_CAPTURES, // Queen promotions and captures with SEE values < 0 PH_KILLER_1, // Killer move 1 from the current ply (not used yet). PH_KILLER_2, // Killer move 2 from the current ply (not used yet). PH_NONCAPTURES, // Non-captures and underpromotions diff --git a/src/search.cpp b/src/search.cpp index f2904184..fca3d2c9 100644 --- a/src/search.cpp +++ b/src/search.cpp @@ -931,7 +931,7 @@ namespace { { assert(move_is_ok(move)); - bool fewMoves = (depth <= OnePly && mp.number_of_moves() < 4); + bool lastMinuteSurprise = (depth <= OnePly && mp.current_move_type() == MovePicker::PH_GOOD_CAPTURES); bool singleReply = (pos.is_check() && mp.number_of_moves() == 1); bool moveIsCheck = pos.move_is_check(move, dcCandidates); bool moveIsCapture = pos.move_is_capture(move); @@ -943,7 +943,7 @@ namespace { PawnValueMidgame : pos.midgame_value_of_piece_on(move_to(move)); // Decide the new search depth - Depth ext = extension(pos, move, true, moveIsCheck, singleReply || fewMoves, mateThreat); + Depth ext = extension(pos, move, true, moveIsCheck, singleReply || lastMinuteSurprise, mateThreat); Depth newDepth = depth - OnePly + ext; // Make and search the move -- 2.39.2