OpenChess

Jeremy Bernstein wrote:

Prima wrote:gaard,Jeremy, Marcos Costalba etc,

thanks for the patch builds. What version of Preserve Analysis (F - J ?) is this latest patch from Marcos Costalba based on?

It's Stockfish 2.0.1 + the Stockfish team's own code for PA on top of it.

Prima wrote:

Jeremy Bernstein wrote:

Prima wrote:gaard,Jeremy, Marcos Costalba etc,

thanks for the patch builds. What version of Preserve Analysis (F - J ?) is this latest patch from Marcos Costalba based on?

It's Stockfish 2.0.1 + the Stockfish team's own code for PA on top of it.

Thanks for the reply Jeremy. I know the patch is from SF team (through Marcos Costalba) but what version of PA is this patch applied to? Currently, version PA_G is considered safe and stable.

Was this latest patch from the SF team (Marcos Costalba) applied to Stockfish 2.01PA_F/G, H, I, or J?

gaard wrote:

Prima wrote:

Jeremy Bernstein wrote:

Prima wrote:gaard,Jeremy, Marcos Costalba etc,

thanks for the patch builds. What version of Preserve Analysis (F - J ?) is this latest patch from Marcos Costalba based on?

It's Stockfish 2.0.1 + the Stockfish team's own code for PA on top of it.

Thanks for the reply Jeremy. I know the patch is from SF team (through Marcos Costalba) but what version of PA is this patch applied to? Currently, version PA_G is considered safe and stable.

Was this latest patch from the SF team (Marcos Costalba) applied to Stockfish 2.01PA_F/G, H, I, or J?

The patch is applied to the original source code for 2.0.1. It only includes the latest patch suggested by mcostalba. It does what versions G did and it's probably more thoroughly tested if it is going to be part of the next Stockfish release, therefore, I suggest using pamc or pamc with the addition changes by other forum members.

These incorporate proper root node probing, Peter's other changes, the Marco changes, the Decembrist TT changes, and so on

    if (SpNode)
    {
        // Here we have the lock still grabbed                                  
        sp->slaves[threadID] = 0;
        sp->nodes += pos.nodes_searched();
        sp->tbhits += pos.tb_hits (); // add this
        lock_release(&(sp->lock));
    }

    splitPoint.nodes = 0;
    splitPoint.tbhits = 0; // add this

    // We have returned from the idle loop, which means that all threads are    
    // finished. Update alpha and bestValue, and return.                        
    lock_grab(&mpLock);

    *alpha = splitPoint.alpha;
    *bestValue = splitPoint.bestValue;
    masterThread.activeSplitPoints--;
    masterThread.splitPoint = splitPoint.parent;
    pos.set_nodes_searched(pos.nodes_searched() + splitPoint.nodes);
    pos.set_tb_hits (pos.tb_hits () + splitPoint.tbhits); // add this
    lock_release(&mpLock);

  // Shared data
  Lock lock;
  volatile int64_t nodes;
  volatile int64_t tbhits; // add this
  volatile Value alpha;
  volatile Value bestValue;
  volatile int moveCount;
  volatile bool betaCutoff;
  volatile int slaves[MAX_THREADS];

Jeremy Bernstein wrote:Thanks. Fixes incorporated. I moved a few things around and I'm pretty confident that it's working properly now. My only concern now is the use of hard probing at the root. If we don't, root values will be missed under low time conditions. However, it certainly adds some overhead. Any thoughts about that? I'll post new builds when I get off my train...

Peter C wrote:

Jeremy Bernstein wrote:Thanks. Fixes incorporated. I moved a few things around and I'm pretty confident that it's working properly now. My only concern now is the use of hard probing at the root. If we don't, root values will be missed under low time conditions. However, it certainly adds some overhead. Any thoughts about that? I'll post new builds when I get off my train...

I think we shouldn't hard probe at root. The positions where that would matter are less important than the speed we would lose.

Peter

Engine                     Score              St             St             St             St             St    S-B
Stockfish-201-64-ja        30,5/52 ·············· =1==101=1=10=  =0=10====1=11  11==1010=0===  1==1=11=0====   775,00
Stockfish_201_x64          28,5/53 =0==010=0=01=  ·············· ==1=0=01====== ==========1=1  =====1=11=11=   722,75
Stockfish_201_64_pamc      25,0/53 =1=01====0=00  ==0=1=10====== ·············· =10=0=1==1==0  ==0=1=0=0==1=   667,50
Stockfish_201_popcnt_pamc  24,5/53 00==0101=1===  ==========0=0  =01=1=0==0==1  ·············· =1=0=1=00=====  655,00
Stockfish_201_PAMC_GTB_x64 23,5/53 0==0=00=1====  =====0=00=00=  ==1=0=1=1==0=  =0=1=0=11===== ··············  625,25

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