## ShashChess

**Moderators:** bob, hgm, Harvey Williamson

**Forum rules**

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### Re: ShashChess

https://github.com/amchess/ShashChess/r ... tag/6.1.3

I completely isolated mcts code.

If there are yet problems on android perhaps it's beyond my current expertise.

As usual, all other versions are welcome.

I completely isolated mcts code.

If there are yet problems on android perhaps it's beyond my current expertise.

As usual, all other versions are welcome.

### Re: ShashChess

https://github.com/amchess/ShashChess/r ... /tag/6.2.4

Stockfish patch

Change outposts to single value Feb 8, 2019

Corrected mcts and negative contempt bugs

No skip 25/01/2019 CoffeOne and Corchess (great improvement)

As always, other versions are welcome, in particular, Android and Mac.

Andrea

Stockfish patch

Change outposts to single value Feb 8, 2019

Corrected mcts and negative contempt bugs

No skip 25/01/2019 CoffeOne and Corchess (great improvement)

As always, other versions are welcome, in particular, Android and Mac.

Andrea

### Re: ShashChess

7.0 released

https://github.com/amchess/ShashChess/releases/tag/7.0

Added match against the latest stockfish:

https://github.com/amchess/ShashChess/wiki/Matches

As usual, the other builds are welcome.

Andrea

https://github.com/amchess/ShashChess/releases/tag/7.0

Added match against the latest stockfish:

https://github.com/amchess/ShashChess/wiki/Matches

As usual, the other builds are welcome.

Andrea

### Re: ShashChess

I have a proposition.

The goal of ShashChess is to offer a tool for a correspondence player

This is not the goal of Stockfish community.

Now, there are a lot of stockfish derivate.

As far as I know, only my engine has a whole theory behind.

This theory enables a coherent improvement.

For example, on the official stockfish testing framework, there are a lot of yellow patch:

http://tests.stockfishchess.org/tests

Based on my systematic tests, a lot of them can be integrated in the engine with an increasing elo strength in terms of game play and hard positions solving.

Already present results are a lot appreciated:

https://github.com/amchess/ShashChess/w ... -about-him

but the possible improvements are yet a lot!

The problem is I can’t do this alone because I’m a professional programmer and can’t take up a lot of time from my skills improvements also in other important directions.

So, I ask for a help in three directions:

-tests in a systematic fashion like I explained in the wiki:

https://github.com/amchess/ShashChess/wiki/Tests

-discovery of the most promising yellow patches on the framework

-integration of the patches and other eventual ideas.

I think if we want a great tool we have to unify our efforts, if the goal is not the spotlight, but doing something useful: strenght only lies in unity.

Andrea

The goal of ShashChess is to offer a tool for a correspondence player

This is not the goal of Stockfish community.

Now, there are a lot of stockfish derivate.

As far as I know, only my engine has a whole theory behind.

This theory enables a coherent improvement.

For example, on the official stockfish testing framework, there are a lot of yellow patch:

http://tests.stockfishchess.org/tests

Based on my systematic tests, a lot of them can be integrated in the engine with an increasing elo strength in terms of game play and hard positions solving.

Already present results are a lot appreciated:

https://github.com/amchess/ShashChess/w ... -about-him

but the possible improvements are yet a lot!

The problem is I can’t do this alone because I’m a professional programmer and can’t take up a lot of time from my skills improvements also in other important directions.

So, I ask for a help in three directions:

-tests in a systematic fashion like I explained in the wiki:

https://github.com/amchess/ShashChess/wiki/Tests

-discovery of the most promising yellow patches on the framework

-integration of the patches and other eventual ideas.

I think if we want a great tool we have to unify our efforts, if the goal is not the spotlight, but doing something useful: strenght only lies in unity.

Andrea

### Re: ShashChess

Hi Andrea!

Thanks for the new version!

Why is the given solution 1...Rc8 a single best move?

Black's lost after this one as well as with other moves.

CFish- output after Forward- Backward and 1...Rc8:

2r3k1/5p2/4p1n1/6Q1/1p2b3/1P1p3B/2p5/5RK1 w - - 0 1

Analysis by Cfish 230219 64 POP N:

2.Kh2 Ra8 3.Qe3 Ra2 4.Rc1 Ra5 5.Qxe4 d2 6.Qxc2 dxc1R 7.Qxc1 Rh5 8.Qd2 Rh4 9.Kg3 Re4 10.Bg4 Re5 11.Qxb4 Rg5 12.Kf2 Ne5 13.Be2 Rf5+ 14.Ke1 Nd7 15.Qh4 Rd5 16.b4 f6 17.b5 Kf7 18.Qb4 Nb6 19.Qa5 Nd7 20.Qa7 Kg6 21.b6 Rd6 22.b7 Kf5 23.Kf2 Rd5 24.Qe3

+- (11.09) Depth: 39/67 00:06:09 10851MN, tb=41789278

24 threads of 12x3GHz, 32G hash and 6men Syzygys.

Did the Fish miss something? I can't find a way to hold that.

Alternative moves for Black after 1...Rc8 2.Kh2 with some more Forward- Backward accordingly back to position after

2...Kg7:

2r5/5pk1/4p1n1/6Q1/1p2b3/1P1p3B/2p4K/5R2 w - - 0 1

Analysis by Cfish 230219 64 POP N:

3.Qf6+ Kh6 4.Qd4 c1Q 5.Rxc1 Rc2+ 6.Rxc2 dxc2 7.Qe3+ Kg7 8.Bg2 Bf5 9.Kg3 Kf6 10.Qh6 Ke7 11.Qd2 e5 12.Qxb4+ Kd7 13.Qb5+ Ke7 14.Qc5+ Kf6 15.Qd6+ Kg7 16.Qd2 Nf4 17.Bf1 Be4 18.Bc4 Nh5+ 19.Kf2 Nf6 20.Ke2 Bg6 21.Bd3 e4 22.Bc4 Bh5+ 23.Ke1 Nh7 24.Qxc2 Ng5 25.Qc3+ Kg6 26.Qb4 Bf3 27.Kd2 f6 28.Be2 Bh1 29.Bf1 Nf3+ 30.Ke3 Ne5 31.Be2 Kf7 32.Qd6 Kg6 33.Qe7 Bg2 34.Qf8

+- (11.25) Depth: 36/67 00:00:50 1480MN, tb=6080054

2...Rf8:

5rk1/5p2/4p1n1/6Q1/1p2b3/1P1p3B/2p4K/5R2 w - - 0 1

Analysis by Cfish 230219 64 POP N:

3.Rg1 Bd5 4.Qe3 Bxb3 5.Qxd3 Rc8 6.Rc1 Rc3 7.Qd6 Rc4 8.Qg3 Ba2 9.Qd3 Rc3 10.Qd8+ Kh7 11.Qa5 Bd5 12.Qxb4 Rc4 13.Qb2 Be4 14.Qf6 Rc7 15.Qd4 Bf3 16.Qd8 Rc4 17.Qd3 Bd5 18.Rxc2 Rh4 19.Rf2 f5 20.Qc3 f4 21.Qf6 f3 22.Kg3 Rf4 23.Qg5 Ra4 24.Bg4 Ra1 25.Rh2+ Kg7 26.Rc2 e5

+- (11.41) Depth: 39/75 00:06:44 11298MN, tb=72429593

Tried to let ShashChess play out with Black after 1...Rc8 against CFish as well, there isn't any way to build up a fortress and prevent the 1-0, is there?

Thanks for the new version!

Downloaded the test positions from there and started with the last one, nr. 326:amchess wrote: ↑Sat Mar 02, 2019 10:34 amSo, I ask for a help in three directions:

-tests in a systematic fashion like I explained in the wiki:

https://github.com/amchess/ShashChess/wiki/Tests

Why is the given solution 1...Rc8 a single best move?

Black's lost after this one as well as with other moves.

CFish- output after Forward- Backward and 1...Rc8:

2r3k1/5p2/4p1n1/6Q1/1p2b3/1P1p3B/2p5/5RK1 w - - 0 1

Analysis by Cfish 230219 64 POP N:

2.Kh2 Ra8 3.Qe3 Ra2 4.Rc1 Ra5 5.Qxe4 d2 6.Qxc2 dxc1R 7.Qxc1 Rh5 8.Qd2 Rh4 9.Kg3 Re4 10.Bg4 Re5 11.Qxb4 Rg5 12.Kf2 Ne5 13.Be2 Rf5+ 14.Ke1 Nd7 15.Qh4 Rd5 16.b4 f6 17.b5 Kf7 18.Qb4 Nb6 19.Qa5 Nd7 20.Qa7 Kg6 21.b6 Rd6 22.b7 Kf5 23.Kf2 Rd5 24.Qe3

+- (11.09) Depth: 39/67 00:06:09 10851MN, tb=41789278

24 threads of 12x3GHz, 32G hash and 6men Syzygys.

Did the Fish miss something? I can't find a way to hold that.

Alternative moves for Black after 1...Rc8 2.Kh2 with some more Forward- Backward accordingly back to position after

2...Kg7:

2r5/5pk1/4p1n1/6Q1/1p2b3/1P1p3B/2p4K/5R2 w - - 0 1

Analysis by Cfish 230219 64 POP N:

3.Qf6+ Kh6 4.Qd4 c1Q 5.Rxc1 Rc2+ 6.Rxc2 dxc2 7.Qe3+ Kg7 8.Bg2 Bf5 9.Kg3 Kf6 10.Qh6 Ke7 11.Qd2 e5 12.Qxb4+ Kd7 13.Qb5+ Ke7 14.Qc5+ Kf6 15.Qd6+ Kg7 16.Qd2 Nf4 17.Bf1 Be4 18.Bc4 Nh5+ 19.Kf2 Nf6 20.Ke2 Bg6 21.Bd3 e4 22.Bc4 Bh5+ 23.Ke1 Nh7 24.Qxc2 Ng5 25.Qc3+ Kg6 26.Qb4 Bf3 27.Kd2 f6 28.Be2 Bh1 29.Bf1 Nf3+ 30.Ke3 Ne5 31.Be2 Kf7 32.Qd6 Kg6 33.Qe7 Bg2 34.Qf8

+- (11.25) Depth: 36/67 00:00:50 1480MN, tb=6080054

2...Rf8:

5rk1/5p2/4p1n1/6Q1/1p2b3/1P1p3B/2p4K/5R2 w - - 0 1

Analysis by Cfish 230219 64 POP N:

3.Rg1 Bd5 4.Qe3 Bxb3 5.Qxd3 Rc8 6.Rc1 Rc3 7.Qd6 Rc4 8.Qg3 Ba2 9.Qd3 Rc3 10.Qd8+ Kh7 11.Qa5 Bd5 12.Qxb4 Rc4 13.Qb2 Be4 14.Qf6 Rc7 15.Qd4 Bf3 16.Qd8 Rc4 17.Qd3 Bd5 18.Rxc2 Rh4 19.Rf2 f5 20.Qc3 f4 21.Qf6 f3 22.Kg3 Rf4 23.Qg5 Ra4 24.Bg4 Ra1 25.Rh2+ Kg7 26.Rc2 e5

+- (11.41) Depth: 39/75 00:06:44 11298MN, tb=72429593

Tried to let ShashChess play out with Black after 1...Rc8 against CFish as well, there isn't any way to build up a fortress and prevent the 1-0, is there?

Peter.

### Re: ShashChess

Hi Peter.

I don't know.

It's a collection of positions from the net, for example, here.

So, I didn't check them one by one.

Perhaps, there is an error.

I have to control.

Best regards,

Andrea

I don't know.

It's a collection of positions from the net, for example, here.

So, I didn't check them one by one.

Perhaps, there is an error.

I have to control.

Best regards,

Andrea

### Re: ShashChess

[Event "Setting ICC Analysis to 8"]

[Site "?"]

[Date "2019.03.04"]

[Round "?"]

[White "Position 326 Sugar 1.6.1 BMI2"]

[Black "Unchecking Null Move" "Unchecking Dynamic Strategy"]

[Result "*"]

[Annotator "Shahrad"]

[SetUp "1"]

[FEN "r5k1/5p2/4p1n1/6Q1/1p2b3/1P1p3B/2p5/5RK1 b - - 0 1"]

[PlyCount "82"]

[SourceVersionDate "2019.03.04"]

{SugaR 1.6.1 64 BMI2:} 1... Rc8 2. Kh2 Kg7 3. Qf6+ Kh6 4. Qd4 f5 5. Rg1 Rc7 6.

Qf6 Rg7 7. Qxe6 d2 8. Bxf5 Bxf5 9. Qe3+ Kh7 10. Qxd2 Ne5 11. Rxg7+ Kxg7 12.

Qg5+ Ng6 13. Kg3 Be6 14. Kf2 Bxb3 15. Qc5 Kf6 16. Qc6+ Kg7 17. Ke3 Ne5 18. Qg2+

Kf6 19. Kd2 Nc4+ 20. Kc1 Ne5 21. Qe4 Ke6 22. Kd2 Bd5 23. Qxc2 {[%eval 98,27]} {

SugaR 1.6.1 64 BMI2:} Kd6 24. Qc8 Nc6 25. Qf8+ Kc7 26. Qc5 Be6 27. Kc1 Bb3 28.

Kb1 Ba4 29. Qg1 Kd6 30. Kb2 Kd5 31. Qa1 Bb5 32. Qh1+ Kc5 33. Qh5+ Kc4 34. Qf7+

Kc5 35. Qf8+ Kd4 36. Qf4+ Kc5 37. Qg5+ Kc4 38. Qc1+ Kd5 39. Kb3 Be2 40. Qg5+

Kd6 41. Ka4 Bc4 42. Qh5 {[%eval 168,27]} *

It finds this solution after 19 half moves. I am not an engine pro but I assume that by hard positions you usually cannot find the solution using Null Move Heuristic.

Black needs two minor pieces plus one pawn vs Queen.

[Site "?"]

[Date "2019.03.04"]

[Round "?"]

[White "Position 326 Sugar 1.6.1 BMI2"]

[Black "Unchecking Null Move" "Unchecking Dynamic Strategy"]

[Result "*"]

[Annotator "Shahrad"]

[SetUp "1"]

[FEN "r5k1/5p2/4p1n1/6Q1/1p2b3/1P1p3B/2p5/5RK1 b - - 0 1"]

[PlyCount "82"]

[SourceVersionDate "2019.03.04"]

{SugaR 1.6.1 64 BMI2:} 1... Rc8 2. Kh2 Kg7 3. Qf6+ Kh6 4. Qd4 f5 5. Rg1 Rc7 6.

Qf6 Rg7 7. Qxe6 d2 8. Bxf5 Bxf5 9. Qe3+ Kh7 10. Qxd2 Ne5 11. Rxg7+ Kxg7 12.

Qg5+ Ng6 13. Kg3 Be6 14. Kf2 Bxb3 15. Qc5 Kf6 16. Qc6+ Kg7 17. Ke3 Ne5 18. Qg2+

Kf6 19. Kd2 Nc4+ 20. Kc1 Ne5 21. Qe4 Ke6 22. Kd2 Bd5 23. Qxc2 {[%eval 98,27]} {

SugaR 1.6.1 64 BMI2:} Kd6 24. Qc8 Nc6 25. Qf8+ Kc7 26. Qc5 Be6 27. Kc1 Bb3 28.

Kb1 Ba4 29. Qg1 Kd6 30. Kb2 Kd5 31. Qa1 Bb5 32. Qh1+ Kc5 33. Qh5+ Kc4 34. Qf7+

Kc5 35. Qf8+ Kd4 36. Qf4+ Kc5 37. Qg5+ Kc4 38. Qc1+ Kd5 39. Kb3 Be2 40. Qg5+

Kd6 41. Ka4 Bc4 42. Qh5 {[%eval 168,27]} *

It finds this solution after 19 half moves. I am not an engine pro but I assume that by hard positions you usually cannot find the solution using Null Move Heuristic.

Black needs two minor pieces plus one pawn vs Queen.

### Re: ShashChess

Apparently Sugar's solution doesn't work too. I have only a 4 year old i3 and 16gb ram. As far as I checked its analysis, there are several improvements for White in the first 12 half moves.