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"Simplified ABDADA" updated
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Nicu Ionita



Joined: 22 Oct 2010
Posts: 152
Location: Austria

PostPost subject: Re: "Simplified ABDADA" updated    Posted: Fri Nov 24, 2017 2:16 pm Reply to topic Reply with quote

Hi Tom,

Many thanks for the write up!

I followed your ideas and implemented simplified ABDADA in Barbarossa (up to step 6, but without cutoff checks yet). I skipped some of the preparation steps which were meant basically to make sure the implementation is correct so far.

In my own tests I got ~80 Elo for 2 cores, which is in accordance with the theory. Not sure how it scales further, I will need more tests.

The multi threading Barbarossa will be used in next HGM tournament.

There were some technical complications with:
- LMR: when I defer a move, it will be played at the end with the "later" reduction (not sure if this is correct)
- re-search (because I use PVS): I think you already stated that in this case the "currently searching" of that move should be deleted, so that other threads eventually help with the re-search: I implemented this idea, but I'm not sure if it is quite correct or if it has any effect without synchronization between threads
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Display posts from previous:   
Subject Author Date/Time
"Simplified ABDADA" updated Tom Kerrigan Tue Aug 29, 2017 5:11 am
      Re: "Simplified ABDADA" updated Michel Van den Bergh Tue Aug 29, 2017 6:23 am
            Re: "Simplified ABDADA" updated Tom Kerrigan Tue Aug 29, 2017 6:34 am
                  Re: "Simplified ABDADA" updated Nicu Ionita Fri Nov 24, 2017 2:16 pm
                        Re: "Simplified ABDADA" updated Tom Kerrigan Sat Dec 02, 2017 6:30 pm
                              Re: "Simplified ABDADA" updated Nicu Ionita Tue Dec 05, 2017 9:40 am
      Re: "Simplified ABDADA" updated Jean-Christophe WEILL Wed Dec 13, 2017 7:47 pm
            Re: "Simplified ABDADA" updated Tom Kerrigan Thu Dec 14, 2017 2:17 am
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