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Stockfish 1.8 tweaks
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Vratko Polák



Joined: 05 Nov 2009
Posts: 54
PostPost subject: Stockfish 1.8 tweaks    Posted: Fri Jul 09, 2010 1:14 am Reply to topic Reply with quote
I will publish all my patches here in this thread.

First, I like makefile to compile fast and not to ask about architecture:
Code:
diff -dur src-ja/Makefile src/Makefile
--- src-ja/Makefile     2010-06-30 03:19:38.000000000 +0200
+++ src/Makefile        2010-07-06 13:19:13.000000000 +0200
@@ -299,7 +299,7 @@
 ### ==========================================================================
 
 default:
-       $(MAKE) ARCH=$(ARCH) COMP=$(COMP) build
+       $(MAKE) ARCH=x86-32 COMP=gcc build
 
 help:
        @echo ""
@@ -408,7 +408,7 @@
        -strip $(BINDIR)/$(EXE)
 
 clean:
-       $(RM) $(EXE) *.o .depend *~ core bench.txt
+       $(RM) $(EXE) *.o .depend *~ core bench.txt *.gcda
 
 testrun:
        @$(PGOBENCH)

Second, I want ucinewgame to clear hash table, and this time also to clear pawn evaluation tables (not sure if I have done it correctly):
Code:
diff -dur src/search.cpp src-Ch/search.cpp
--- src/search.cpp      2010-07-06 13:17:26.000000000 +0200
+++ src-Ch/search.cpp   2010-07-06 14:39:37.000000000 +0200
@@ -455,7 +455,7 @@
 
   // Read UCI option values
   TT.set_size(get_option_value_int("Hash"));
-  if (button_was_pressed("Clear Hash"))
+  if (button_was_pressed("Clear Hash") || button_was_pressed("New Game"))
       TT.clear();
 
   CheckExtension[1]         = Depth(get_option_value_int("Check Extension (PV nodes)"));
@@ -484,7 +484,7 @@
 
   // Set the number of active threads
   int newActiveThreads = get_option_value_int("Threads");
-  if (newActiveThreads != TM.active_threads())
+  if (newActiveThreads != TM.active_threads() || button_was_pressed("New Game"))
   {
       TM.set_active_threads(newActiveThreads);
       init_eval(TM.active_threads());

Third, I started to prepare HDE patch. It has many new features, but it is still not polished enough to actually increase elo.

But in the meantime, Tinapa 1.01 was released, so I cloned it back to Stockfish:
Code:
diff -dur src-Ch/search.cpp src-TiCh/search.cpp
--- src-Ch/search.cpp   2010-07-06 14:39:37.000000000 +0200
+++ src-TiCh/search.cpp 2010-07-08 11:50:00.000000000 +0200
@@ -1185,7 +1185,7 @@
         ss->currentMove = MOVE_NULL;
 
         // Null move dynamic reduction based on depth
-        int R = 3 + (depth >= 5 * OnePly ? depth / 8 : 0);
+        int R = 3 + (depth >= 9 ? (depth - 3) / 6 : 0); // inspired by Tinapa 1.01
 
         // Null move dynamic reduction based on value
         if (refinedValue - beta > PawnValueMidgame)
and I saw it still uses 5*OnePly constant reduction for zugzwang verification of null search. I was patching that in 1.7.1 already, but this time I used testposition first, and I have come to conclusion that the best reduction for verification is exactly R:
Code:
diff -dur src-TiCh/search.cpp src-TiAvCh/search.cpp
--- src-TiCh/search.cpp 2010-07-08 11:50:00.000000000 +0200
+++ src-TiAvCh/search.cpp       2010-07-08 11:48:37.000000000 +0200
@@ -1206,11 +1206,11 @@
                 nullValue = beta;
 
             // Do zugzwang verification search at high depths
-            if (depth < 6 * OnePly)
+            if (depth-R*OnePly < OnePly)
                 return nullValue;
 
             ss->skipNullMove = true;
-            Value v = search<NonPV>(pos, ss, alpha, beta, depth-5*OnePly, ply);
+            Value v = search<NonPV>(pos, ss, alpha, beta, depth-R*OnePly, ply);
             ss->skipNullMove = false;
 
             if (v >= beta)


And here is my first positive test: Tinapa with constant verification (first 3 patches together) lost to Tinapa with adaptive verification (all 4 patches) by +189 =597 -214 (++21 +=59 +-31 =+42 ==185 =-75 -+15 -=51 --21) that makes bayeselo to say LOS=19:80.

By the way, are there any known testpositions where accuracy (or speed, or both) of verification search is important?
_________________
Testing conditions:
tc=/0:40+.1 option.Threads=1 option.Hash=32 option.Ponder=false -pgnin gaviota-starters.pgn -concurrency 1 -repeat -games 1000
hash clear between games
make build ARCH=x86-64 COMP=gcc
around 680kps on 1 thread at startposition.
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Subject Author Date/Time
Stockfish 1.8 tweaks Vratko Polák Fri Jul 09, 2010 1:14 am
      Re: Stockfish 1.8 tweaks Richard Vida Fri Jul 09, 2010 10:30 am
            Re: Stockfish 1.8 tweaks Eelco de Groot Fri Jul 09, 2010 11:46 am
                  Not a problem for GnuChess! Michel Van den Bergh Fri Jul 09, 2010 11:50 am
            Re: Stockfish 1.8 tweaks Vratko Polák Sat Jul 10, 2010 5:41 am
                  Re: Stockfish 1.8 tweaks Marco Costalba Sat Jul 10, 2010 8:31 am
                  Re: Stockfish 1.8 tweaks Marco Costalba Sun Jul 11, 2010 7:19 am
                        Re: Stockfish 1.8 tweaks Vratko Polák Sun Jul 11, 2010 1:05 pm
                              Re: Stockfish 1.8 tweaks Marco Costalba Sun Jul 11, 2010 1:17 pm
                                    Re: Stockfish 1.8 tweaks Adam Kleng Sun Jul 11, 2010 1:29 pm
                                    Re: Stockfish 1.8 tweaks Robert Houdart Sun Jul 11, 2010 1:31 pm
                                    Re: Stockfish 1.8 tweaks Vratko Polák Sun Jul 11, 2010 2:21 pm
                                          Re: Stockfish 1.8 tweaks Adam Kleng Mon Jul 12, 2010 7:20 pm
                                                Re: Stockfish 1.8 tweaks Vratko Polák Mon Jul 19, 2010 9:31 pm
                  Re: Stockfish 1.8 tweaks Vratko Polák Mon Jul 19, 2010 9:00 pm
                        Re: Stockfish 1.8 tweaks Marco Costalba Tue Jul 20, 2010 6:13 am
            Re: Stockfish 1.8 tweaks Uri Blass Sat Jul 10, 2010 10:47 am
                  Re: Stockfish 1.8 tweaks Marco Costalba Sat Jul 10, 2010 11:06 am
            Re: Stockfish 1.8 tweaks Vratko Polák Thu Jul 29, 2010 8:14 pm
                  Re: Stockfish 1.8 tweaks Vratko Polák Fri Jul 30, 2010 6:33 pm
                        Re: Stockfish 1.8 tweaks Marco Costalba Sat Jul 31, 2010 6:49 am
                              Re: Stockfish 1.8 tweaks Marco Costalba Sat Jul 31, 2010 7:49 pm
                                    Re: Stockfish 1.8 tweaks Robert Hyatt Sat Jul 31, 2010 8:45 pm
                                          Re: Stockfish 1.8 tweaks Marco Costalba Sat Jul 31, 2010 10:50 pm
                                          Re: Stockfish 1.8 tweaks Vratko Polák Sun Aug 01, 2010 12:46 am
                                                Re: Stockfish 1.8 tweaks Robert Hyatt Sun Aug 01, 2010 6:19 am
                                                Re: Stockfish 1.8 tweaks Daniel Shawul Sun Aug 01, 2010 9:56 am
                                                      Re: Stockfish 1.8 tweaks Edsel Apostol Sun Aug 01, 2010 10:14 am
                                                            Re: Stockfish 1.8 tweaks Daniel Shawul Sun Aug 01, 2010 10:30 am
                                                                  Re: Stockfish 1.8 tweaks Edsel Apostol Sun Aug 01, 2010 11:47 am
                                                                        Re: Stockfish 1.8 tweaks Daniel Shawul Sun Aug 01, 2010 12:02 pm
                                                      Re: Stockfish 1.8 tweaks Vratko Polák Sun Aug 01, 2010 9:04 pm
                                                            Re: Stockfish 1.8 tweaks Vratko Polák Tue Aug 03, 2010 7:21 pm
                                                                  Re: Stockfish 1.8 tweaks Daniel Shawul Tue Aug 03, 2010 7:36 pm
                                                                  Re: Stockfish 1.8 tweaks Marco Costalba Tue Aug 03, 2010 11:22 pm
                                                                        Re: Stockfish 1.8 tweaks Vratko Polák Wed Aug 04, 2010 6:38 pm
                                    Re: Stockfish 1.8 tweaks Vratko Polák Sat Jul 31, 2010 10:03 pm
                                          Re: Stockfish 1.8 tweaks Marco Costalba Sat Jul 31, 2010 11:04 pm
                                                Re: Stockfish 1.8 tweaks Joona Kiiski Sun Aug 01, 2010 6:46 am
                                          Re: Stockfish 1.8 tweaks Vratko Polák Sun Aug 01, 2010 9:15 pm
                                                Re: Stockfish 1.8 tweaks Vratko Polák Mon Aug 02, 2010 8:14 pm
                                                      Re: Stockfish 1.8 tweaks Vratko Polák Mon Aug 09, 2010 8:53 pm
                                                            Re: Stockfish 1.8 tweaks Vratko Polák Thu Aug 12, 2010 7:26 pm
                        Re: Stockfish 1.8 tweaks Vratko Polák Sat Jul 31, 2010 7:19 pm
      Re: Stockfish 1.8 tweaks Marco Costalba Fri Jul 09, 2010 12:06 pm
            Re: Stockfish 1.8 tweaks Luis Smith Fri Jul 09, 2010 10:56 pm
      Re: Stockfish 1.8 tweaks Marco Costalba Sat Jul 10, 2010 3:48 pm
      Re: Stockfish 1.8 tweaks Vratko Polák Wed Jul 21, 2010 7:48 pm
            Re: Stockfish 1.8 tweaks Marco Costalba Thu Jul 22, 2010 2:29 am
                  Re: Stockfish 1.8 tweaks Vratko Polák Thu Jul 29, 2010 8:27 pm
                  Re: Stockfish 1.8 tweaks Miguel A. Ballicora Thu Jul 29, 2010 8:44 pm
                        Re: Stockfish 1.8 tweaks Robert Hyatt Fri Jul 30, 2010 4:49 pm
            Re: Stockfish 1.8 tweaks Vratko Polák Tue Aug 24, 2010 7:03 pm
      Re: Stockfish 1.8 tweaks Vratko Polák Wed Aug 11, 2010 9:22 pm
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