Stockfish question

[Rebel]

Is there an option to totally exclude LMR in Stockfish? I want to measure the elo gain of LMR.

But perhaps one of the programmers can tell me straight away

Ed

[Peter C]

Is there an option to totally exclude LMR in Stockfish? I want to measure the elo gain of LMR.

But perhaps one of the programmers can tell me straight away

Ed

Suppose you could edit it yourself and recompile without LMR. But other than that, I don't think so.

Peter

[mcostalba]

Apply following patch and compile.

Code: Select all


--- a/src/search.cpp
+++ b/src/search.cpp
@@ -882,7 +882,7 @@ namespace {
                     // if the move fails high will be re-searched at full depth
                     bool doFullDepthSearch = true;
 
-                    if (    depth >= 3 * OnePly
+                    if (    false && depth >= 3 * OnePly
                         && !dangerous
                         && !captureOrPromotion
                         && !move_is_castle(move))
@@ -1351,7 +1351,7 @@ namespace {
           // If the move fails high will be re-searched at full depth.
           bool doFullDepthSearch = true;
 
-          if (    depth >= 3 * OnePly
+          if (    false && depth >= 3 * OnePly
               && !captureOrPromotion
               && !dangerous
               && !move_is_castle(move)
@@ -1728,7 +1728,7 @@ namespace {
       // If the move fails high will be re-searched at full depth.
       bool doFullDepthSearch = true;
 
-      if (   !captureOrPromotion
+      if (   false && !captureOrPromotion
           && !dangerous
           && !move_is_castle(move)
           && !move_is_killer(move, ss))



[Sean Evans]

Is there an option to totally exclude LMR in Stockfish? I want to measure the elo gain of LMR.

But perhaps one of the programmers can tell me straight away

Ed

Suppose you could edit it yourself and recompile without LMR. But other than that, I don't think so.

Peter

And you are 12-years old Peter? Ed has been a programmer three times longer than you have been alive

[Sentinel]

And you are 12-years old Peter? Ed has been a programmer three times longer than you have been alive

As Marco shown LMR condition appears in only 3 lines in search.cpp. Finding them, even if you are unfamiliar with Stockfish code takes about 1 minute (supposing you have some chess programming experience, which is more than true in Ed's case).
Ed's question just demonstrates his laziness I would say...

[mcostalba]

Ed's question just demonstrates his laziness I would say...

Also my answer

[Rebel]

Ed's question just demonstrates his laziness I would say...

Exactly!

And going one step further, would someone do it for me?

Seriously, I don't have MSVC and don't want to go through that. I exclusively have used the "Digital Mars" compiler in the past and that one is not compatible with MSVC and/or GCC source code.

Ed

[mcostalba]

Ed's question just demonstrates his laziness I would say...

Exactly!

And going one step further, would someone do it for me?

Seriously, I don't have MSVC and don't want to go through that. I exclusively have used the "Digital Mars" compiler in the past and that one is not compatible with MSVC and/or GCC source code.

Ed

Sure ! As long as that 'someone' is not me


BTW you'd certanly know that you can download and setup MSVC 2010 Express version for free and in less then half an hour, do you ?

[Peter C]

Is there an option to totally exclude LMR in Stockfish? I want to measure the elo gain of LMR.

But perhaps one of the programmers can tell me straight away

Ed

Suppose you could edit it yourself and recompile without LMR. But other than that, I don't think so.

Peter

And you are 12-years old Peter? Ed has been a programmer three times longer than you have been alive

Ahem. 13.

Peter

[Rebel]

BTW you'd certanly know that you can download and setup MSVC 2010 Express version for free and in less then half an hour, do you ?

Well, as nobody volunteered I had too I have an eng-eng match running now, SF 1.8 vs SF 1.8 (no LMR). Long time ago I did the stuff.

The normal SF typically hits 5-6 more plies than the no-LMR version on a time-control of 40/10. Nevertheless the first game looks bad for SF 1.8

We will see...

Ed