Sorting losing captures ?

MahmoudUthman · Post by **MahmoudUthman** » Sat Feb 25, 2017 10:54 pm

What is the best technique for sorting losing captures ?

jdart · Post by **jdart** » Sat Feb 25, 2017 11:27 pm

I sort by MVV/LVA and then when the move is actually being used, if it is a capture, I do SEE and if the score is negative the move is deferred - it goes into a "losing capures" array and moves are fetched out of there only at the end of move generation, assuming the search ever gets there.

--Jon

MahmoudUthman · Post by **MahmoudUthman** » Sat Feb 25, 2017 11:46 pm

jdart wrote:I sort by MVV/LVA and then when the move is actually being used, if it is a capture, I do SEE and if the score is negative the move is deferred - it goes into a "losing capures" array and moves are fetched out of there only at the end of move generation, assuming the search ever gets there.

--Jon

have you tried the same thing using just MVV in the main search ?

jdart · Post by **jdart** » Sun Feb 26, 2017 12:39 am

have you tried the same thing using just MVV in the main search ?

No, I have not.

--Jon

Ferdy · Post by **Ferdy** » Mon Feb 27, 2017 3:16 am

MahmoudUthman wrote:What is the best technique for sorting losing captures ?

Long ago I tried the following. I am not claiming it is the best

.

Code: Select all

Deuterium
Version 09.01.26.492 &#40;21Dec09&#41;

&#91;...&#93;

8. Added capture killer moves, these are lossing capture moves that produces a cutoff.

&#91;...&#93;

Henk · Post by **Henk** » Mon Feb 27, 2017 10:27 am

How do you know if a losing capture is not winning sacrifice ? So only near the leaves losing captures are applicable.

Evert · Post by **Evert** » Mon Feb 27, 2017 1:09 pm

Ferdy wrote: Long ago I tried the following. I am not claiming it is the best .
Code: Select all
Deuterium
Version 09.01.26.492 &#40;21Dec09&#41;

&#91;...&#93;

8. Added capture killer moves, these are lossing capture moves that produces a cutoff.

&#91;...&#93;

I have experimented with that too, but the results I found were not very convincing.

Volker Annuss · Post by **Volker Annuss** » Tue Feb 28, 2017 7:24 pm

Ferdy wrote:Long ago I tried the following. I am not claiming it is the best :).
Code: Select all
Deuterium
Version 09.01.26.492 &#40;21Dec09&#41;

&#91;...&#93;

8. Added capture killer moves, these are lossing capture moves that produces a cutoff.

&#91;...&#93;

Making captures killers works for me. The only captures that are excluded from killers are moves that capture the last moved piece.

Sorting losing captures ?

Sorting losing captures ?

Re: Sorting losing captures ?

Re: Sorting losing captures ?

Re: Sorting losing captures ?

Re: Sorting losing captures ?

Re: Sorting losing captures ?

Re: Sorting losing captures ?

Re: Sorting losing captures ?