About Obsidian

[DmitriyFrosty]

Guys, I don’t want to say anything, but take a look at his code, and specifically the amount of code taken from Stockfish.

[Damir]

Why should we care?
It is open source, so the amount of code taken is irrelevant.

[Chessqueen]

Guys, I don’t want to say anything, but take a look at his code, and specifically the amount of code taken from Stockfish.

I decided to test Stockfish16 and Obsidian by removing the Opening Book and forcing only the 1st move 1.c4.....versus the same opponent Berserk12 and I realized after 18 moves that both Stockfish and obsidian 10 were making the exact identical moves. Therefore, you are correct obsidian has more than 99% of the same codes as Stockfish 16

[pgn][Event "Computer chess game"] [Site "?"] [Date "2024.01.23"] [Round "?"] [White "Obsidian10-avx2"] [Black "Berserk-12-x64-avx2"] [Result "1/2-1/2"] [BlackElo "3495"] [ECO "A00"] [Opening "Clemenz (Mead-Basman-de Klerk-Welling) Opening"] [Time "17:48:03"] [WhiteElo "3495"] [TimeControl "1500+10"] [Termination "normal"] [PlyCount "153"] [WhiteType "program"] [BlackType "program"] 1. c4 e5 2. d3 Bb4+ 3. Nd2 Nf6 4. Nf3 Bd6 5. g3 O-O 6. Bg2 Re8 7. a3 a5 8. b3 Bf8 9. Bb2 Nc6 10. O-O d5 11. cxd5 Nxd5 12. Rc1 f6 13. Re1 Qd7 14. Ne4 {(Nd2-e4 Qd7-f7 Rc1-c2 h7-h6 Qd1-c1 Nd5-b6 Nf3-d2 Nb6-d5 Nd2-f3) 0.00/49 223} Qf7 {(Qd7-f7 Qd1-c2 h7-h6 Ne4-c5 Re8-d8 e2-e3 Bf8xc5 Qc2xc5 Bc8-e6 Nf3-d2 Nd5-e7 d3-d4 Ra8-b8 Qc5-c2 e5xd4 Bb2xd4 Be6-d5 Bd4-a1 Bd5xg2 Kg1xg2 Rd8-d7 Nd2-f3 Rb8-d8 Re1-d1 Rd7xd1 Rc1xd1 Rd8xd1 Qc2xd1 Qf7-g6 Qd1-d7 Qg6-b1 Ba1-c3 Qb1xb3 Bc3xa5 Kg8-h7 h2-h4 Qb3xa3 Ba5xc7 Qa3-a8) -0.14/36 49} 15. Nc5 {(Ne4-c5 b7-b6 Nc5-e4 Nc6-d4 Bb2xd4 e5xd4 Nf3xd4 Bf8xa3 Ne4-c3 Nd5xc3 Rc1xc3 Ba3-b4 Rc3-c4 Bc8-a6 Rc4xb4 a5xb4 Bg2xa8 Re8xa8 Nd4-c6 Ba6-b7 Qd1-c2 h7-h5 d3-d4 Bb7xc6 Qc2xc6 Ra8-a5 Qc6-c2 h5-h4 g3xh4 Ra5-h5 Re1-c1 Rh5xh4 Qc2xc7 Qf7xc7 Rc1xc7 Rh4xd4 Rc7-e7 Kg8-f8 Re7-e3 Rd4-d1+ Kg1-g2 Rd1-b1 h2-h4 g7-g6) +0.03/43 52} b6 {(b7-b6 Nc5-e4 Nc6-d4 Bb2xd4 e5xd4 Nf3xd4 Bf8xa3 Ne4-c3 Nd5xc3 Rc1xc3 Ba3-b4 Rc3-c4 Ra8-a6 Qd1-c2 c7-c5 Re1-a1 Kg8-h8 Nd4-c6 Bc8-e6 Nc6xb4 Be6xc4 Nb4xa6 Bc4xa6 e2-e3 h7-h6 Ra1-d1 Qf7-g6 Qc2-d2 Qg6-f7) 0.00/38 53} 16. Ne4 {(Nc5-e4 Nc6-d4 e2-e3 Nd4xf3+ Bg2xf3 Bc8-e6 Bf3-h5 g7-g6 Bh5-f3 Ra8-d8 h2-h4 c7-c5 Qd1-e2 Be6-f5 Qe2-c2 h7-h5 Rc1-d1 b6-b5 d3-d4 c5xd4 e3xd4 b5-b4 a3-a4 Nd5-c3 Bb2xc3 b4xc3 d4xe5 Bf8-b4 Rd1xd8 Re8xd8 Re1-d1 Rd8-d2 Rd1xd2 c3xd2 Qc2-d3 Kg8-g7 Qd3-e2 Bf5xe4 Qe2xe4 Qf7xb3 Qe4-b7+ Qb3-f7 e5xf6+ Kg7xf6 Qb7-b5 d2-d1R+ Bf3xd1 Kf6-g7) +0.02/45 28} Nd4 {(Nc6-d4 Bb2xd4 e5xd4 Nf3xd4 Bf8xa3 Ne4-c3 Nd5xc3 Rc1xc3 Ba3-b4 Rc3-c4 Ra8-b8 Re1-f1 Bc8-a6 Nd4-c6 Ba6xc4 b3xc4 Qf7-d7 Nc6xb8 Re8xb8 e2-e3 g7-g6 h2-h4 Kg8-g7 h4-h5 a5-a4 Bg2-f3 b6-b5 c4xb5 Qd7xb5 Qd1-c2 Bb4-d6 Bf3-c6 Qb5xh5 Qc2xa4 Rb8-b2 Bc6-g2 Qh5-b5 Qa4xb5 Rb2xb5 Bg2-f3 h7-h5 Kg1-g2 f6-f5 Rf1-a1 Rb5-b2) -0.01/39 36} 17. Bxd4 {(Bb2xd4 e5xd4 Nf3xd4 Bf8xa3 Ne4-c3 Nd5xc3 Rc1xc3 Ba3-b4 Rc3-c4 Bc8-a6 Rc4xb4 a5xb4 Bg2xa8 Re8xa8 Nd4-c6 Ba6-b7 Qd1-c2 h7-h5 d3-d4 Bb7xc6 Qc2xc6 Ra8-a5 Re1-c1 Qf7xb3 Qc6xc7 Qb3-e6 Qc7-c4 Qe6xc4 Rc1xc4 Ra5-a4 Kg1-g2 Kg8-f7 Kg2-f3 Kf7-e6 e2-e4 b6-b5 Rc4-c6+ Ke6-f7 Rc6-c5 Ra4-a3+ Kf3-g2 Ra3-a5 Rc5-c2 b4-b3 Rc2-b2 Ra5-a4 Rb2xb3 Ra4xd4 Kg2-f3 Rd4-a4 Rb3xb5 Ra4-a3+ Kf3-g2 Ra3-a4 e4-e5 f6xe5 Kg2-h3) +0.03/47 29} exd4 {(e5xd4 Nf3xd4 Bf8xa3 Ne4-c3 Nd5xc3 Rc1xc3 Ba3-b4 Rc3-c4 Ra8-b8 Re1-f1 Bc8-a6 Nd4-c6 Ba6xc4 b3xc4 Qf7-d7 Nc6xb8 Re8xb8 e2-e3 g7-g6 h2-h4 Kg8-g7 h4-h5 a5-a4 d3-d4 f6-f5 Bg2-f3 Bb4-e7 Qd1-c2 a4-a3 Rf1-b1 g6-g5 c4-c5 f5-f4 Qc2-e4 f4xg3 f2xg3 Be7-f6 Kg1-g2 Kg7-h6 Rb1-b3 a3-a2 Rb3-a3 b6xc5 Ra3xa2 c5xd4 e3xd4 Qd7xd4) -0.03/41 43} 18. Nxd4 {(Nf3xd4 Bf8xa3 Ne4-c3 Nd5xc3 Rc1xc3 Ba3-b4 Rc3-c4 Bc8-a6 Rc4xb4 a5xb4 Bg2xa8 Re8xa8 Nd4-c6 Ba6-b7 Qd1-c2 h7-h5 d3-d4 Bb7xc6 Qc2xc6 Ra8-a2 Qc6-b5 Ra2-b2 Qb5xb4 Rb2xb3 Qb4-d2 Qf7-d5 e2-e4 Qd5-a5 Qd2xa5 b6xa5 Re1-a1 Rb3-b4 Ra1xa5 Rb4xd4 e4-e5 f6xe5 h2-h4 c7-c5 Ra5xc5 g7-g6 Kg1-g2 Rd4-a4 Rc5-c6 Kg8-g7 Rc6-c2 Ra4-a3 f2-f3 Kg7-f7 Kg2-f2 Ra3-a1 Rc2-b2 Ra1-a3 Rb2-c2) 0.00/56 29} *[/pgn]

[Chessqueen]

I decided to test Stockfish16 and Obsidian by removing the Opening Book and forcing only the 1st move 1.c4.....versus the same opponent Berserk12 and I realized after 18 moves that both Stockfish and obsidian 10 were making the exact identical moves. Therefore, you are correct obsidian has more than 99% of the same codes as Stockfish 16

[pgn][Event "Computer chess game"] [Site "DESKTOP-4QNC0GS"] [Date "2024.01.25"] [Round "?"] [White "Stockfish-windows-x86-64-avx2x"] [Black "Berserk-12-x64-avx2"] [Result "*"] [BlackElo "3495"] [ECO "A20"] [Opening "English"] [Time "03:01:08"] [Variation "KID, 2.d3"] [WhiteElo "3550"] [TimeControl "1500+10"] [Termination "unterminated"] [PlyCount "27"] [WhiteType "program"] [BlackType "program"] 1. c4 e5 2. d3 Bb4+ 3. Nd2 Nf6 4. Nf3 Bd6 5. g3 O-O 6. Bg2 Re8 7. a3 a5 8. b3 Bf8 9. Bb2 Nc6 10. O-O d5 11. cxd5 Nxd5 12. Rc1 f6 13. Re1 Qd7 14. Ne4 {(Nd2-e4 Qd7-f7 Rc1-c2 h7-h6 Qd1-c1 Nd5-b6 Nf3-d2 Nb6-d5 Nd2-f3) 0.00/49 223} Qf7 {(Qd7-f7 Qd1-c2 h7-h6 Ne4-c5 Re8-d8 e2-e3 Bf8xc5 Qc2xc5 Bc8-e6 Nf3-d2 Nd5-e7 d3-d4 Ra8-b8 Qc5-c2 e5xd4 Bb2xd4 Be6-d5 Bd4-a1 Bd5xg2 Kg1xg2 Rd8-d7 Nd2-f3 Rb8-d8 Re1-d1 Rd7xd1 Rc1xd1 Rd8xd1 Qc2xd1 Qf7-g6 Qd1-d7 Qg6-b1 Ba1-c3 Qb1xb3 Bc3xa5 Kg8-h7 h2-h4 Qb3xa3 Ba5xc7 Qa3-a8) -0.14/36 49} 15. Nc5 {(Ne4-c5 b7-b6 Nc5-e4 Nc6-d4 Bb2xd4 e5xd4 Nf3xd4 Bf8xa3 Ne4-c3 Nd5xc3 Rc1xc3 Ba3-b4 Rc3-c4 Bc8-a6 Rc4xb4 a5xb4 Bg2xa8 Re8xa8 Nd4-c6 Ba6-b7 Qd1-c2 h7-h5 d3-d4 Bb7xc6 Qc2xc6 Ra8-a5 Qc6-c2 h5-h4 g3xh4 Ra5-h5 Re1-c1 Rh5xh4 Qc2xc7 Qf7xc7 Rc1xc7 Rh4xd4 Rc7-e7 Kg8-f8 Re7-e3 Rd4-d1+ Kg1-g2 Rd1-b1 h2-h4 g7-g6) +0.03/43 52} b6 {(b7-b6 Nc5-e4 Nc6-d4 Bb2xd4 e5xd4 Nf3xd4 Bf8xa3 Ne4-c3 Nd5xc3 Rc1xc3 Ba3-b4 Rc3-c4 Ra8-a6 Qd1-c2 c7-c5 Re1-a1 Kg8-h8 Nd4-c6 Bc8-e6 Nc6xb4 Be6xc4 Nb4xa6 Bc4xa6 e2-e3 h7-h6 Ra1-d1 Qf7-g6 Qc2-d2 Qg6-f7) 0.00/38 53} 16. Ne4 {(Nc5-e4 Nc6-d4 e2-e3 Nd4xf3+ Bg2xf3 Bc8-e6 Bf3-h5 g7-g6 Bh5-f3 Ra8-d8 h2-h4 c7-c5 Qd1-e2 Be6-f5 Qe2-c2 h7-h5 Rc1-d1 b6-b5 d3-d4 c5xd4 e3xd4 b5-b4 a3-a4 Nd5-c3 Bb2xc3 b4xc3 d4xe5 Bf8-b4 Rd1xd8 Re8xd8 Re1-d1 Rd8-d2 Rd1xd2 c3xd2 Qc2-d3 Kg8-g7 Qd3-e2 Bf5xe4 Qe2xe4 Qf7xb3 Qe4-b7+ Qb3-f7 e5xf6+ Kg7xf6 Qb7-b5 d2-d1R+ Bf3xd1 Kf6-g7) +0.02/45 28} Nd4 {(Nc6-d4 Bb2xd4 e5xd4 Nf3xd4 Bf8xa3 Ne4-c3 Nd5xc3 Rc1xc3 Ba3-b4 Rc3-c4 Ra8-b8 Re1-f1 Bc8-a6 Nd4-c6 Ba6xc4 b3xc4 Qf7-d7 Nc6xb8 Re8xb8 e2-e3 g7-g6 h2-h4 Kg8-g7 h4-h5 a5-a4 Bg2-f3 b6-b5 c4xb5 Qd7xb5 Qd1-c2 Bb4-d6 Bf3-c6 Qb5xh5 Qc2xa4 Rb8-b2 Bc6-g2 Qh5-b5 Qa4xb5 Rb2xb5 Bg2-f3 h7-h5 Kg1-g2 f6-f5 Rf1-a1 Rb5-b2) -0.01/39 36} 17. Bxd4 {(Bb2xd4 e5xd4 Nf3xd4 Bf8xa3 Ne4-c3 Nd5xc3 Rc1xc3 Ba3-b4 Rc3-c4 Bc8-a6 Rc4xb4 a5xb4 Bg2xa8 Re8xa8 Nd4-c6 Ba6-b7 Qd1-c2 h7-h5 d3-d4 Bb7xc6 Qc2xc6 Ra8-a5 Re1-c1 Qf7xb3 Qc6xc7 Qb3-e6 Qc7-c4 Qe6xc4 Rc1xc4 Ra5-a4 Kg1-g2 Kg8-f7 Kg2-f3 Kf7-e6 e2-e4 b6-b5 Rc4-c6+ Ke6-f7 Rc6-c5 Ra4-a3+ Kf3-g2 Ra3-a5 Rc5-c2 b4-b3 Rc2-b2 Ra5-a4 Rb2xb3 Ra4xd4 Kg2-f3 Rd4-a4 Rb3xb5 Ra4-a3+ Kf3-g2 Ra3-a4 e4-e5 f6xe5 Kg2-h3) +0.03/47 29} exd4 {(e5xd4 Nf3xd4 Bf8xa3 Ne4-c3 Nd5xc3 Rc1xc3 Ba3-b4 Rc3-c4 Ra8-b8 Re1-f1 Bc8-a6 Nd4-c6 Ba6xc4 b3xc4 Qf7-d7 Nc6xb8 Re8xb8 e2-e3 g7-g6 h2-h4 Kg8-g7 h4-h5 a5-a4 d3-d4 f6-f5 Bg2-f3 Bb4-e7 Qd1-c2 a4-a3 Rf1-b1 g6-g5 c4-c5 f5-f4 Qc2-e4 f4xg3 f2xg3 Be7-f6 Kg1-g2 Kg7-h6 Rb1-b3 a3-a2 Rb3-a3 b6xc5 Ra3xa2 c5xd4 e3xd4 Qd7xd4) -0.03/41 43} 18. Nxd4 {(Nf3xd4 Bf8xa3 Ne4-c3 Nd5xc3 Rc1xc3 Ba3-b4 Rc3-c4 Bc8-a6 Rc4xb4 a5xb4 Bg2xa8 Re8xa8 Nd4-c6 Ba6-b7 Qd1-c2 h7-h5 d3-d4 Bb7xc6 Qc2xc6 Ra8-a2 Qc6-b5 Ra2-b2 Qb5xb4 Rb2xb3 Qb4-d2 Qf7-d5 e2-e4 Qd5-a5 Qd2xa5 b6xa5 Re1-a1 Rb3-b4 Ra1xa5 Rb4xd4 e4-e5 f6xe5 h2-h4 c7-c5 Ra5xc5 g7-g6 Kg1-g2 Rd4-a4 Rc5-c6 Kg8-g7 Rc6-c2 Ra4-a3 f2-f3 Kg7-f7 Kg2-f2 Ra3-a1 Rc2-b2 Ra1-a3 Rb2-c2) 0.00/56 29} *[/pgn]

[Graham Banks]

..........obsidian has more than 99% of the same codes as Stockfish 16

Then why have none of the experts said so?
Probably because you're 99% wrong.

[Sylwy]

..........obsidian has more than 99% of the same codes as Stockfish 16

Then why have none of the experts said so?

Simple. It would probably be a loss for CCRL testers. Anyway, innumerable flower copies of Stockfish are tested hard.....A modern engine does not only have the neural network....With Rybka there were other interests....Sorry for the intrusion...!

[Graham Banks]

..........obsidian has more than 99% of the same codes as Stockfish 16

Then why have none of the experts said so?

Simple. It would probably be a loss for CCRL testers. Anyway, innumerable flower copies of Stockfish are tested hard.....A modern engine does not only have the neural network....With Rybka there were other interests....Sorry for the intrusion...!

In the computer chess programming discord channels, I know that if there was anything amiss with Obsidian, we'd have all known about it by now.
From what I can gather, it's fine.

[Frank Quisinsky]

In the past, I have often thought that programmers should keep their sources secret.
In a fight with myself and github, github always won with around 65-35.
Because it's good for programmers to learn from other's work and ideas.
The best thing is when new ideas can be produced.

But most of all I like the programs where the programmer goes his own way.
A good example of this is John Stanback. For John, all the sources of others are never important.
OK, should be clear ... he has been working on his programs for more than 40 years.

What I do not like are really programs that do 90% of the same as others with a new name.
But I am not a programmer and hope that others with knowledge about it can give such information.

With statistics, only such things are complicated to see, a lot of work and most of the time very boring.

All in all I am very happy with so many strong available chess programs.
What I dislike completly are all the derivative Stockfish versions and if programs prodcued "Chewing-gum-draws", games not ended in clear draw positions.

[Sylwy]

..........obsidian has more than 99% of the same codes as Stockfish 16

Then why have none of the experts said so?

Simple. It would probably be a loss for CCRL testers. Anyway, innumerable flower copies of Stockfish are tested hard.....A modern engine does not only have the neural network....With Rybka there were other interests....Sorry for the intrusion...!

In the computer chess programming discord channels, I know that if there was anything amiss with Obsidian, we'd have all known about it by now.
From what I can gather, it's fine.

......I often think of a large dissecting room where Stockfish is an object of study.....maybe I'm wrong.....but soon only the logos will differentiate the engines..... and it will be said that chess is a settled matter........that for chess fun we only use special opening books....poor people.....

[ImNotStockfish]

Guys, I don’t want to say anything, but take a look at his code, and specifically the amount of code taken from Stockfish.

I decided to test Stockfish16 and Obsidian by removing the Opening Book and forcing only the 1st move 1.c4.....versus the same opponent Berserk12 and I realized after 18 moves that both Stockfish and obsidian 10 were making the exact identical moves. Therefore, you are correct obsidian has more than 99% of the same codes as Stockfish 16

[pgn][Event "Computer chess game"] [Site "?"] [Date "2024.01.23"] [Round "?"] [White "Obsidian10-avx2"] [Black "Berserk-12-x64-avx2"] [Result "1/2-1/2"] [BlackElo "3495"] [ECO "A00"] [Opening "Clemenz (Mead-Basman-de Klerk-Welling) Opening"] [Time "17:48:03"] [WhiteElo "3495"] [TimeControl "1500+10"] [Termination "normal"] [PlyCount "153"] [WhiteType "program"] [BlackType "program"] 1. c4 e5 2. d3 Bb4+ 3. Nd2 Nf6 4. Nf3 Bd6 5. g3 O-O 6. Bg2 Re8 7. a3 a5 8. b3 Bf8 9. Bb2 Nc6 10. O-O d5 11. cxd5 Nxd5 12. Rc1 f6 13. Re1 Qd7 14. Ne4 {(Nd2-e4 Qd7-f7 Rc1-c2 h7-h6 Qd1-c1 Nd5-b6 Nf3-d2 Nb6-d5 Nd2-f3) 0.00/49 223} Qf7 {(Qd7-f7 Qd1-c2 h7-h6 Ne4-c5 Re8-d8 e2-e3 Bf8xc5 Qc2xc5 Bc8-e6 Nf3-d2 Nd5-e7 d3-d4 Ra8-b8 Qc5-c2 e5xd4 Bb2xd4 Be6-d5 Bd4-a1 Bd5xg2 Kg1xg2 Rd8-d7 Nd2-f3 Rb8-d8 Re1-d1 Rd7xd1 Rc1xd1 Rd8xd1 Qc2xd1 Qf7-g6 Qd1-d7 Qg6-b1 Ba1-c3 Qb1xb3 Bc3xa5 Kg8-h7 h2-h4 Qb3xa3 Ba5xc7 Qa3-a8) -0.14/36 49} 15. Nc5 {(Ne4-c5 b7-b6 Nc5-e4 Nc6-d4 Bb2xd4 e5xd4 Nf3xd4 Bf8xa3 Ne4-c3 Nd5xc3 Rc1xc3 Ba3-b4 Rc3-c4 Bc8-a6 Rc4xb4 a5xb4 Bg2xa8 Re8xa8 Nd4-c6 Ba6-b7 Qd1-c2 h7-h5 d3-d4 Bb7xc6 Qc2xc6 Ra8-a5 Qc6-c2 h5-h4 g3xh4 Ra5-h5 Re1-c1 Rh5xh4 Qc2xc7 Qf7xc7 Rc1xc7 Rh4xd4 Rc7-e7 Kg8-f8 Re7-e3 Rd4-d1+ Kg1-g2 Rd1-b1 h2-h4 g7-g6) +0.03/43 52} b6 {(b7-b6 Nc5-e4 Nc6-d4 Bb2xd4 e5xd4 Nf3xd4 Bf8xa3 Ne4-c3 Nd5xc3 Rc1xc3 Ba3-b4 Rc3-c4 Ra8-a6 Qd1-c2 c7-c5 Re1-a1 Kg8-h8 Nd4-c6 Bc8-e6 Nc6xb4 Be6xc4 Nb4xa6 Bc4xa6 e2-e3 h7-h6 Ra1-d1 Qf7-g6 Qc2-d2 Qg6-f7) 0.00/38 53} 16. Ne4 {(Nc5-e4 Nc6-d4 e2-e3 Nd4xf3+ Bg2xf3 Bc8-e6 Bf3-h5 g7-g6 Bh5-f3 Ra8-d8 h2-h4 c7-c5 Qd1-e2 Be6-f5 Qe2-c2 h7-h5 Rc1-d1 b6-b5 d3-d4 c5xd4 e3xd4 b5-b4 a3-a4 Nd5-c3 Bb2xc3 b4xc3 d4xe5 Bf8-b4 Rd1xd8 Re8xd8 Re1-d1 Rd8-d2 Rd1xd2 c3xd2 Qc2-d3 Kg8-g7 Qd3-e2 Bf5xe4 Qe2xe4 Qf7xb3 Qe4-b7+ Qb3-f7 e5xf6+ Kg7xf6 Qb7-b5 d2-d1R+ Bf3xd1 Kf6-g7) +0.02/45 28} Nd4 {(Nc6-d4 Bb2xd4 e5xd4 Nf3xd4 Bf8xa3 Ne4-c3 Nd5xc3 Rc1xc3 Ba3-b4 Rc3-c4 Ra8-b8 Re1-f1 Bc8-a6 Nd4-c6 Ba6xc4 b3xc4 Qf7-d7 Nc6xb8 Re8xb8 e2-e3 g7-g6 h2-h4 Kg8-g7 h4-h5 a5-a4 Bg2-f3 b6-b5 c4xb5 Qd7xb5 Qd1-c2 Bb4-d6 Bf3-c6 Qb5xh5 Qc2xa4 Rb8-b2 Bc6-g2 Qh5-b5 Qa4xb5 Rb2xb5 Bg2-f3 h7-h5 Kg1-g2 f6-f5 Rf1-a1 Rb5-b2) -0.01/39 36} 17. Bxd4 {(Bb2xd4 e5xd4 Nf3xd4 Bf8xa3 Ne4-c3 Nd5xc3 Rc1xc3 Ba3-b4 Rc3-c4 Bc8-a6 Rc4xb4 a5xb4 Bg2xa8 Re8xa8 Nd4-c6 Ba6-b7 Qd1-c2 h7-h5 d3-d4 Bb7xc6 Qc2xc6 Ra8-a5 Re1-c1 Qf7xb3 Qc6xc7 Qb3-e6 Qc7-c4 Qe6xc4 Rc1xc4 Ra5-a4 Kg1-g2 Kg8-f7 Kg2-f3 Kf7-e6 e2-e4 b6-b5 Rc4-c6+ Ke6-f7 Rc6-c5 Ra4-a3+ Kf3-g2 Ra3-a5 Rc5-c2 b4-b3 Rc2-b2 Ra5-a4 Rb2xb3 Ra4xd4 Kg2-f3 Rd4-a4 Rb3xb5 Ra4-a3+ Kf3-g2 Ra3-a4 e4-e5 f6xe5 Kg2-h3) +0.03/47 29} exd4 {(e5xd4 Nf3xd4 Bf8xa3 Ne4-c3 Nd5xc3 Rc1xc3 Ba3-b4 Rc3-c4 Ra8-b8 Re1-f1 Bc8-a6 Nd4-c6 Ba6xc4 b3xc4 Qf7-d7 Nc6xb8 Re8xb8 e2-e3 g7-g6 h2-h4 Kg8-g7 h4-h5 a5-a4 d3-d4 f6-f5 Bg2-f3 Bb4-e7 Qd1-c2 a4-a3 Rf1-b1 g6-g5 c4-c5 f5-f4 Qc2-e4 f4xg3 f2xg3 Be7-f6 Kg1-g2 Kg7-h6 Rb1-b3 a3-a2 Rb3-a3 b6xc5 Ra3xa2 c5xd4 e3xd4 Qd7xd4) -0.03/41 43} 18. Nxd4 {(Nf3xd4 Bf8xa3 Ne4-c3 Nd5xc3 Rc1xc3 Ba3-b4 Rc3-c4 Bc8-a6 Rc4xb4 a5xb4 Bg2xa8 Re8xa8 Nd4-c6 Ba6-b7 Qd1-c2 h7-h5 d3-d4 Bb7xc6 Qc2xc6 Ra8-a2 Qc6-b5 Ra2-b2 Qb5xb4 Rb2xb3 Qb4-d2 Qf7-d5 e2-e4 Qd5-a5 Qd2xa5 b6xa5 Re1-a1 Rb3-b4 Ra1xa5 Rb4xd4 e4-e5 f6xe5 h2-h4 c7-c5 Ra5xc5 g7-g6 Kg1-g2 Rd4-a4 Rc5-c6 Kg8-g7 Rc6-c2 Ra4-a3 f2-f3 Kg7-f7 Kg2-f2 Ra3-a1 Rc2-b2 Ra1-a3 Rb2-c2) 0.00/56 29} *[/pgn]

I decided to test Stockfish16 and Obsidian by removing the Opening Book and forcing only the 1st move 1.c4.....versus the same opponent Berserk12 and I realized after 18 moves that both Stockfish and obsidian 10 were making the exact identical moves. Therefore, you are correct obsidian has more than 99% of the same codes as Stockfish 16

[pgn][Event "Computer chess game"] [Site "DESKTOP-4QNC0GS"] [Date "2024.01.25"] [Round "?"] [White "Stockfish-windows-x86-64-avx2x"] [Black "Berserk-12-x64-avx2"] [Result "*"] [BlackElo "3495"] [ECO "A20"] [Opening "English"] [Time "03:01:08"] [Variation "KID, 2.d3"] [WhiteElo "3550"] [TimeControl "1500+10"] [Termination "unterminated"] [PlyCount "27"] [WhiteType "program"] [BlackType "program"] 1. c4 e5 2. d3 Bb4+ 3. Nd2 Nf6 4. Nf3 Bd6 5. g3 O-O 6. Bg2 Re8 7. a3 a5 8. b3 Bf8 9. Bb2 Nc6 10. O-O d5 11. cxd5 Nxd5 12. Rc1 f6 13. Re1 Qd7 14. Ne4 {(Nd2-e4 Qd7-f7 Rc1-c2 h7-h6 Qd1-c1 Nd5-b6 Nf3-d2 Nb6-d5 Nd2-f3) 0.00/49 223} Qf7 {(Qd7-f7 Qd1-c2 h7-h6 Ne4-c5 Re8-d8 e2-e3 Bf8xc5 Qc2xc5 Bc8-e6 Nf3-d2 Nd5-e7 d3-d4 Ra8-b8 Qc5-c2 e5xd4 Bb2xd4 Be6-d5 Bd4-a1 Bd5xg2 Kg1xg2 Rd8-d7 Nd2-f3 Rb8-d8 Re1-d1 Rd7xd1 Rc1xd1 Rd8xd1 Qc2xd1 Qf7-g6 Qd1-d7 Qg6-b1 Ba1-c3 Qb1xb3 Bc3xa5 Kg8-h7 h2-h4 Qb3xa3 Ba5xc7 Qa3-a8) -0.14/36 49} 15. Nc5 {(Ne4-c5 b7-b6 Nc5-e4 Nc6-d4 Bb2xd4 e5xd4 Nf3xd4 Bf8xa3 Ne4-c3 Nd5xc3 Rc1xc3 Ba3-b4 Rc3-c4 Bc8-a6 Rc4xb4 a5xb4 Bg2xa8 Re8xa8 Nd4-c6 Ba6-b7 Qd1-c2 h7-h5 d3-d4 Bb7xc6 Qc2xc6 Ra8-a5 Qc6-c2 h5-h4 g3xh4 Ra5-h5 Re1-c1 Rh5xh4 Qc2xc7 Qf7xc7 Rc1xc7 Rh4xd4 Rc7-e7 Kg8-f8 Re7-e3 Rd4-d1+ Kg1-g2 Rd1-b1 h2-h4 g7-g6) +0.03/43 52} b6 {(b7-b6 Nc5-e4 Nc6-d4 Bb2xd4 e5xd4 Nf3xd4 Bf8xa3 Ne4-c3 Nd5xc3 Rc1xc3 Ba3-b4 Rc3-c4 Ra8-a6 Qd1-c2 c7-c5 Re1-a1 Kg8-h8 Nd4-c6 Bc8-e6 Nc6xb4 Be6xc4 Nb4xa6 Bc4xa6 e2-e3 h7-h6 Ra1-d1 Qf7-g6 Qc2-d2 Qg6-f7) 0.00/38 53} 16. Ne4 {(Nc5-e4 Nc6-d4 e2-e3 Nd4xf3+ Bg2xf3 Bc8-e6 Bf3-h5 g7-g6 Bh5-f3 Ra8-d8 h2-h4 c7-c5 Qd1-e2 Be6-f5 Qe2-c2 h7-h5 Rc1-d1 b6-b5 d3-d4 c5xd4 e3xd4 b5-b4 a3-a4 Nd5-c3 Bb2xc3 b4xc3 d4xe5 Bf8-b4 Rd1xd8 Re8xd8 Re1-d1 Rd8-d2 Rd1xd2 c3xd2 Qc2-d3 Kg8-g7 Qd3-e2 Bf5xe4 Qe2xe4 Qf7xb3 Qe4-b7+ Qb3-f7 e5xf6+ Kg7xf6 Qb7-b5 d2-d1R+ Bf3xd1 Kf6-g7) +0.02/45 28} Nd4 {(Nc6-d4 Bb2xd4 e5xd4 Nf3xd4 Bf8xa3 Ne4-c3 Nd5xc3 Rc1xc3 Ba3-b4 Rc3-c4 Ra8-b8 Re1-f1 Bc8-a6 Nd4-c6 Ba6xc4 b3xc4 Qf7-d7 Nc6xb8 Re8xb8 e2-e3 g7-g6 h2-h4 Kg8-g7 h4-h5 a5-a4 Bg2-f3 b6-b5 c4xb5 Qd7xb5 Qd1-c2 Bb4-d6 Bf3-c6 Qb5xh5 Qc2xa4 Rb8-b2 Bc6-g2 Qh5-b5 Qa4xb5 Rb2xb5 Bg2-f3 h7-h5 Kg1-g2 f6-f5 Rf1-a1 Rb5-b2) -0.01/39 36} 17. Bxd4 {(Bb2xd4 e5xd4 Nf3xd4 Bf8xa3 Ne4-c3 Nd5xc3 Rc1xc3 Ba3-b4 Rc3-c4 Bc8-a6 Rc4xb4 a5xb4 Bg2xa8 Re8xa8 Nd4-c6 Ba6-b7 Qd1-c2 h7-h5 d3-d4 Bb7xc6 Qc2xc6 Ra8-a5 Re1-c1 Qf7xb3 Qc6xc7 Qb3-e6 Qc7-c4 Qe6xc4 Rc1xc4 Ra5-a4 Kg1-g2 Kg8-f7 Kg2-f3 Kf7-e6 e2-e4 b6-b5 Rc4-c6+ Ke6-f7 Rc6-c5 Ra4-a3+ Kf3-g2 Ra3-a5 Rc5-c2 b4-b3 Rc2-b2 Ra5-a4 Rb2xb3 Ra4xd4 Kg2-f3 Rd4-a4 Rb3xb5 Ra4-a3+ Kf3-g2 Ra3-a4 e4-e5 f6xe5 Kg2-h3) +0.03/47 29} exd4 {(e5xd4 Nf3xd4 Bf8xa3 Ne4-c3 Nd5xc3 Rc1xc3 Ba3-b4 Rc3-c4 Ra8-b8 Re1-f1 Bc8-a6 Nd4-c6 Ba6xc4 b3xc4 Qf7-d7 Nc6xb8 Re8xb8 e2-e3 g7-g6 h2-h4 Kg8-g7 h4-h5 a5-a4 d3-d4 f6-f5 Bg2-f3 Bb4-e7 Qd1-c2 a4-a3 Rf1-b1 g6-g5 c4-c5 f5-f4 Qc2-e4 f4xg3 f2xg3 Be7-f6 Kg1-g2 Kg7-h6 Rb1-b3 a3-a2 Rb3-a3 b6xc5 Ra3xa2 c5xd4 e3xd4 Qd7xd4) -0.03/41 43} 18. Nxd4 {(Nf3xd4 Bf8xa3 Ne4-c3 Nd5xc3 Rc1xc3 Ba3-b4 Rc3-c4 Bc8-a6 Rc4xb4 a5xb4 Bg2xa8 Re8xa8 Nd4-c6 Ba6-b7 Qd1-c2 h7-h5 d3-d4 Bb7xc6 Qc2xc6 Ra8-a2 Qc6-b5 Ra2-b2 Qb5xb4 Rb2xb3 Qb4-d2 Qf7-d5 e2-e4 Qd5-a5 Qd2xa5 b6xa5 Re1-a1 Rb3-b4 Ra1xa5 Rb4xd4 e4-e5 f6xe5 h2-h4 c7-c5 Ra5xc5 g7-g6 Kg1-g2 Rd4-a4 Rc5-c6 Kg8-g7 Rc6-c2 Ra4-a3 f2-f3 Kg7-f7 Kg2-f2 Ra3-a1 Rc2-b2 Ra1-a3 Rb2-c2) 0.00/56 29} *[/pgn]

You can clearly see that the only thing modified between those games are the PGN headers. The moves, evals, depths, and movetimes are exactly the same, which doesn't happen even when using the same engine, you intentionally tampered with the PGN.