Cfish for Android

Skynet · Post by **Skynet** » 05/04/2021, 17:37

CF 030421 Updated to "Remove Condition from Generate_Move Loop". https://github.com/syzygy1/Cfish/commit/5dbf00f9ffae28b0c96a713e897d718204af73e9

Arm7-Arm8 https://pixeldrain.com/l/dqAPk84B#item=1

Skynet · Post by **Skynet** » 11/04/2021, 18:15

CF 110421 Updated to "Refine stat based reductions". https://github.com/syzygy1/Cfish/commit/67742f3b2be90a1bcad524be2c20e0b7e62169bb

Arm7-Arm8 https://pixeldrain.com/l/HWXMvwup#item=1

Skynet · Post by **Skynet** » 17/04/2021, 19:32

CF-110421a - embedded new promising net nn-e1dcce35e7d7.nnue, good for STC and LTC.
only 2884 games played so far and 110421a is already +66 games over CF 030121.

Code: Select all

CF-110421a vs CF-030421: 374 - 308 - 2195

Arm7-Arm8 https://pixeldrain.com/l/zLkeXw24#item=1

Skynet · Post by **Skynet** » 28/04/2021, 19:25

CF-U-280421 - Unofficial by ChessMan, info -> http://outskirts.altervista.org/forum/viewtopic.php?p=29855&view=single_post#p29855

Arm7-Arm8 https://pixeldrain.com/l/K3jksoZE#item=1

Skynet · Post by **Skynet** » 02/05/2021, 20:46

CF-020521 Updated to "Improve play for closed positions". https://github.com/syzygy1/Cfish/commit/6702467a0ee361146114e4b4bfb4a891834f82bc

Arm7-Arm8 https://pixeldrain.com/l/GGrVhAdU#item=1

stvs · Post by **stvs** » 02/05/2021, 22:10

Skynet wrote:CF-020521 Updated to "Improve play for closed positions". https://github.com/syzygy1/Cfish/commit/6702467a0ee361146114e4b4bfb4a891834f82bc

Arm7-Arm8 https://pixeldrain.com/l/GGrVhAdU#item=1

+included chessman latest patches?

Skynet · Post by **Skynet** » 02/05/2021, 22:19

stvs wrote:
Skynet wrote:CF-020521 Updated to "Improve play for closed positions". https://github.com/syzygy1/Cfish/commit/6702467a0ee361146114e4b4bfb4a891834f82bc

Arm7-Arm8 https://pixeldrain.com/l/GGrVhAdU#item=1
+included chessman latest patches?

Not, original.

Skynet · Post by **Skynet** » 06/05/2021, 16:52

CF-U-020521, from ChessMan's src. Info-> http://outskirts.altervista.org/forum/viewtopic.php?f=12&p=30031#p30031

Arm7-Arm8 https://pixeldrain.com/l/w2WSuK8i#item=1

Athlon · Post by **Athlon** » 07/05/2021, 10:26

Windows didn´t download this file because it thinks it is a virus.

Can you upload it to a different place?

Skynet · Post by **Skynet** » 10/05/2021, 17:03

CF-U-090521 Info --> http://outskirts.altervista.org/forum/viewtopic.php?p=30354&view=single_post#p30354

Arm7-Arm8 https://pixeldrain.com/l/NeWhDt3x#item=1

Skynet · Post by **Skynet** » 10/05/2021, 17:08

Athlon wrote:Windows didn´t download this file because it thinks it is a virus.

Can you upload it to a different place?

just now I saw your post. Have you downloaded the engines?
Next time, if there are problems with downloading, whoever can, please provide alternative links.

SwiftSnips · Post by **SwiftSnips** » 10/05/2021, 19:53

This is Cfish with the official patches by Rdm, Chessmans Unofficial patches, plus I added:

Keep More Pawns (April 6th)
Cleanup of likelyFailLow logic (May 7th)

And a few other small "cleanups", for example...(Im not sure why RdM never implemented this)

Before: In evaluate.c (all of these were removed)

Code: Select all

Lines 159, 161, 166, 168
static const Score BishopKingProtector = S(  6,  9);
static const Score BishopOutpost      = S( 31, 23);
static const Score KnightKingProtector = S(  8,  9);
static const Score KnightOutpost       = S( 56, 34);

Lines 284, 293-295
score += Pt == KNIGHT ? KnightOutpost : BishopOutpost;
// Penalty if the minor is far from the king
      score -= (Pt == KNIGHT ? KnightKingProtector : BishopKingProtector) *
                  distance(s, square_of(Us, KING));

After: in evaluate.c (all of this was added)

Code: Select all

Lines 129-135
// KingProtector[knight/bishop] contains penalty for each distance unit to own king
static const Score KingProtector[] = { S(8, 9), S(6, 9 ) };

// Outpost[knight/bishop] contains bonuses for each knight or bishop occupying a
// pawn protected square on rank 4 to 6 which is also safe from a pawn attack.
static const Score Outpost[] = { S(57, 38), S(31, 24)
};

Lines 289-290, 297-298
score += Outpost[Pt == BISHOP];
      else if (Pt == KNIGHT && bb & b & ~pieces_c(Us))
// Penalty if the minor is far from the king
      score -= KingProtector[Pt == BISHOP] * distance(s, square_of(Us, KING));

And a few other items like this...

This version is armv8/aarch64 only (made with extra=yes, lto=yes, sparse=yes, numa=no)
https://www.dropbox.com/s/o5aro1bvniepgwo/Cfish20210509.zip?dl=0

Japhet3719 · Post by **Japhet3719** » 15/05/2021, 8:26

Postby Skynet » 07/05/2021, 0:52

CF-U-020521, from ChessMan's src. Info-> viewtopic.php?f=12&p=30031#p30031

Arm7-Arm8 https://pixeldrain.com/l/w2WSuK8i#item=1

Alternative links pls. I cannot download

Skynet · Post by **Skynet** » 15/05/2021, 19:25

Japhet3719 wrote:Postby Skynet » 07/05/2021, 0:52

CF-U-020521, from ChessMan's src. Info-> viewtopic.php?f=12&p=30031#p30031

Arm7-Arm8 https://pixeldrain.com/l/w2WSuK8i#item=1

Alternative links pls. I cannot download

Arm7 https://www.mirrored.to/files/UETXCPXB/?hash=679ab5795709f91d445e96b55a2bd888&dl=0

Arm8 https://www.mirrored.to/files/1WQVUK2B/?hash=0668c174dee57539f4a26f7b53bed45f&dl=0

SwiftSnips · Post by **SwiftSnips** » 18/05/2021, 22:44

This Cfish has all of the recent Cfish updates via RdM... And all the patches Chessman added. Plus some recent ones added by myself. Heres the list of patches added that the Cfish on the official github doesnt have...

CfishSS_20210517
(Small changes from various "Small cleanup" patches on 1/30, 2/16, 3/24, 3/31, & 5/17)
Simplification for countermoves based pruning (5/15)
Simplify LMR rules for statScore (5/15)
Remove early return in Probcut code (5/15)
Simplify LMR rule for non-checking captures (5/15)
Remove coordination between searching threads (5/11)
Simplify LMR (5/11)
Cleanup of likelyFailLow logic. (5/7)
Simplify check extension (5/2)
Thread based reduction tweak (4/25)
(Everything above this was added by myself)
More extensions if SE search is very low (4/25)
Use classical eval for Bishop vs Pawns 4/15)
Simplification: last capture extension (4/15)
Replace distanceFromPv with a better logic (4/6)
Keep more pawns (4/6) (added by me also)
Remove advanced_pawn_push() (3/17)
Change advanced pawn push threshold (3/10)
Use Bitboard over Square in movegen (3/7)
Introduce DistanceFromPV (2/26)
Introduce ProbCut for check evasions (2/20)
Tune search parameters (2/20)
PV-Nodes likely to fail low (2/11)
Search Parameters Tuning (2/8)
Pawns Tuning (2/8)
Tune ordering of moves at internal nodes (1/31)
Add penalty for doubled pawns in agile structure (1/17)
Bad Outpost Pawn Scale (1/11)

The SS on Cfish is SwiftSnips... Just to differentiate it.
armv8/aarch64
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