Stockfish 18 vs Stockfish 20260510: just 2 positions

[Jouni]

[d]rk1b4/p2p2p1/1P6/2R2P2/8/2K5/8/5B2 w - - 0 1

Stockfish 18:
1.Rd5 Kb7 2.Rd6 Rc8+ 3.Kb3 Bxb6 4.Rxd7+ Rc7 5.Rd6 Rf7 6.Bc4 Re7 7.f6 gxf6 8.Rxf6 Kc7 9.Rf8 Kd6 10.Rf7 Re3+ 11.Kc2 Rg3 12.Bd3 Bd4 13.Be4 Rc3+ 14.Kd2 Ra3 15.Rf5 Be5 16.Rh5 a5 17.Bd3 Kd5 18.Bg6 Kd4 19.Rh4+ Kc5 20.Rg4 a4 21.Bc2 Bc3+ 22.Ke2 Bb4 23.Rg5+ Kc4 24.Bxa4 Rxa4
= (0.00) Depth: 98/88 00:07:08 1468mN, tb=22219185

Stockfish 20260510:
1.Rc8+
+- (1.68 ++) Depth: 59/59 00:00:06 58859kN, tb=63059

[d]1q3k2/1p4pp/pPp3n1/2Pp1pPQ/P2P1P2/7K/3P4/7B w - - 0 1

Stockfish 18:
1.Qxg6
-+ (-3.75 ++) Depth: 36/90 00:05:02 1714mN, tb=299162

Stockfish 20260510:
1.Qxg6 hxg6 2.Kg3 Qe8 3.Kf2 Qe7 4.Bf3 Ke8 5.Bg2 Kd8 6.Bf3 Qe8 7.Bg2 Kd7 8.Bf3 Qh8 9.Kg3 Kc8 10.Bg2 Kb8 11.Kf2
-+ (-2.14) Depth: 22/57 00:00:03 15890kN, tb=446

[peter]

Fist one:

https://www.yacpdb.org/#search/cmsxYjRc ... MS8xLzA=/1

Second one:
[pgn][Event "no ty"]
[Site "; L'Italia Scacchistica#563 1"]
[Date "1936.06.15"]
[Round "?"]
[White "Sacconi=A"]
[Black "(=4013.77h3f8) U2"]
[Result "1/2-1/2"]
[WhiteFideId "-1"]
[BlackFideId "-1"]
[SetUp "1"]
[FEN "1q3k2/1p4pp/pPp3n1/2Pp1pPQ/P2P1P2/7K/3P4/7B w - - 0 1"]
[PlyCount "19"]
[GameId "2308690664821549"]
[EventDate "1936.06.15"]

{source: L'Italia Scacchistica#563 15-6-1936; U2: Campioli=M HHdbIII 23-10-2003} 1. Qxg6 $1 (1. Qxh7 $2 Kf7 2. Kg2 Qxf4 3. Qh3 Qxd2+ 4. Kf1 Qxg5) (1. Qf3 $2 Qxf4 2. Qxf4 Nxf4+ 3. Kg3 Ng6 4. Bg2 Ke7 5. Bf1 Nf8 6. Kf4 g6) 1... hxg6 2. Kg3 Qe8 3. Kf2 $1 Kf7 4. Bf3 (4. Bg2 $1 {<cook MC>}) 4... a5 5. Bg2 (5. d3 $1 {<cook MC>}) 5... Qh8 6. Kg3 Qh5 7. Bf3 Qh8 8. Bg2 (8. d3 $1 {<cook MC>}) 8... Qa8 9. Kf2 $1 (9. d3 $1 {<cook MC>}) 9... Qa6 10. Bf1 1/2-1/2
[/pgn]

In the Sacconi- study Lc0 and Crystal perform quite well too, if you don't insist on 0.00- near eval in small hardware- time, regards

[Uri Blass]

furst position is mate in at most 28 moves
slowchess after some backward analysis

[d]rk1b4/p2p2p1/1P6/2R2P2/8/2K5/8/5B2 w - - 0 1


Slow64-avx2 [001]:

44/70 00:53 251,902k 4,731k +M28 Rc5-c8+ Kb8-b7 Bf1-g2+ Kb7xb6 Rc8xa8 Bd8-e7 Kc3-c4 Be7-g5 Kc4-d5 Kb6-c7 Ra8xa7+ Kc7-d8 Bg2-f1 Kd8-e7 Bf1-b5 Bg5-c1 Bb5xd7 Bc1-b2 Bd7-b5+ Ke7-f6 Bb5-d3 Kf6-g5 Ra7-a4 Kg5-f6 Ra4-g4 Kf6-e7 Rg4-b4 Bb2-c3 Rb4-b6 Ke7-f7 Rb6-e6 Bc3-f6 Kd5-d6 Kf7-g8 Re6-e2 Kg8-f7 Bd3-c4+ Kf7-f8 Re2-e6 Kf8-f7 Re6-e7+ Kf7-f8 Re7-f7+ Kf8-e8 Rf7-b7 Bf6-g5 Rb7-b8+ Bg5-d8 Kd6-e6 g7-g6 f5-f6 g6-g5 Bc4-b5+ Ke8-f8 Rb8xd8+
45/81 01:26 424,992k 4,906k +M28 Rc5-c8+ Kb8-b7 Bf1-g2+ Kb7xb6 Rc8xa8 Bd8-e7 Kc3-c4 Be7-g5 Kc4-d5 Bg5-f6 Ra8-f8 Bf6-a1 Bg2-f1 Ba1-c3 Rf8-f7 d7-d6 Kd5xd6 a7-a5 Rf7-c7 Bc3-e5+ Kd6xe5 Kb6xc7 Ke5-e6 a5-a4 Ke6-f7 a4-a3 Bf1-c4 Kc7-b6 Kf7xg7 Kb6-c5 Bc4-e6 a3-a2 Be6xa2 Kc5-b4 f5-f6 Kb4-a3 f6-f7 Ka3xa2 f7-f8Q Ka2-b3 Kg7-f6 Kb3-c2 Qf8-c5+ Kc2-b3 Kf6-e5 Kb3-b2 Ke5-e4 Kb2-b3 Ke4-d3 Kb3-b2 Qc5-b5+ Kb2-a2 Kd3-c2 Ka2-a3 Qb5-a5+
46/81 01:33 461,781k 4,943k +M28 Rc5-c8+ Kb8-b7 Bf1-g2+ Kb7xb6 Rc8xa8 Bd8-e7 Kc3-c4 Be7-g5 Kc4-d5 Kb6-c7 Ra8xa7+ Kc7-d8 Bg2-f1 Kd8-e7 Bf1-b5 Bg5-c1 Bb5xd7 Bc1-b2 Bd7-b5+ Ke7-f6 Bb5-d3 Kf6-g5 Ra7-a4 Kg5-f6 Ra4-g4 Kf6-e7 Rg4-b4 Bb2-c3 Rb4-b6 Ke7-f7 Rb6-e6 Bc3-f6 Kd5-d6 Kf7-g8 Re6-e2 Kg8-f7 Bd3-c4+ Kf7-f8 Re2-e6 Kf8-f7 Re6-e7+ Kf7-f8 Re7-f7+ Kf8-e8 Rf7-b7 Bf6-g5 Rb7-b8+ Bg5-d8 Kd6-e6 g7-g6 f5-f6 g6-g5 Bc4-b5+ Ke8-f8 Rb8xd8+
47/81 02:33 767,454k 4,994k +M28 Rc5-c8+ Kb8-b7 Bf1-g2+ Kb7xb6 Rc8xa8 Bd8-e7 Kc3-c4 Be7-g5 Kc4-d5 Kb6-c7 Ra8xa7+ Kc7-d8 Bg2-f1 Kd8-e7 Bf1-b5 Bg5-c1 Bb5xd7 Bc1-b2 Bd7-b5+ Ke7-f6 Bb5-d3 Kf6-g5 Ra7-a4 Kg5-f6 Ra4-g4 Kf6-e7 Rg4-b4 Bb2-c3 Rb4-b6 Ke7-f7 Rb6-e6 Bc3-f6 Kd5-d6 Kf7-g8 Re6-e2 Kg8-f7 Bd3-c4+ Kf7-f8 Re2-e6 Kf8-f7 Re6-e7+ Kf7-f8 Re7-f7+ Kf8-e8 Rf7-b7 Bf6-g5 Rb7-b8+ Bg5-d8 Kd6-e6 g7-g6 f5-f6 g6-g5 Bc4-b5+ Ke8-f8 Rb8xd8+
48/81 03:55 1,198,703k 5,098k +M28 Rc5-c8+ Kb8-b7 Bf1-g2+ Kb7xb6 Rc8xa8 Bd8-e7 Kc3-c4 Be7-g5 Kc4-d5 Bg5-f6 Ra8-f8 Bf6-a1 Bg2-f1 Ba1-c3 Rf8-f7 d7-d6 Kd5xd6 a7-a5 Rf7-c7 Bc3-e5+ Kd6xe5 Kb6xc7 Ke5-e6 a5-a4 Bf1-d3 a4-a3 Bd3-b1 Kc7-b6 Ke6-f7 Kb6-a5 Kf7xg7 Ka5-b4 f5-f6 Kb4-b3 f6-f7 a3-a2 Bb1xa2+ Kb3xa2 f7-f8Q Ka2-b3 Kg7-f6 Kb3-c2 Qf8-c5+ Kc2-b3 Kf6-e5 Kb3-b2 Ke5-e4 Kb2-b3 Ke4-d3 Kb3-b2 Qc5-b5+ Kb2-a2 Kd3-c2 Ka2-a3 Qb5-a5+

[Jouni]

This tactical improvement don't give much elo in play . UHO book 60 + 0.6 match.

Code: Select all

                       
1   Stockfish18   +104/=194/-102 50.25%  201.0/400
2   SF20260510    +102/=194/-104 49.75%  199.0/400

[Ajedrecista]

Hello Peter:

Fist one:

https://www.yacpdb.org/#search/cmsxYjRc ... MS8xLzA=/1

Second one:
[pgn][Event "no ty"]
[Site "; L'Italia Scacchistica#563 1"]
[Date "1936.06.15"]
[Round "?"]
[White "Sacconi=A"]
[Black "(=4013.77h3f8) U2"]
[Result "1/2-1/2"]
[WhiteFideId "-1"]
[BlackFideId "-1"]
[SetUp "1"]
[FEN "1q3k2/1p4pp/pPp3n1/2Pp1pPQ/P2P1P2/7K/3P4/7B w - - 0 1"]
[PlyCount "19"]
[GameId "2308690664821549"]
[EventDate "1936.06.15"]

{source: L'Italia Scacchistica#563 15-6-1936; U2: Campioli=M HHdbIII 23-10-2003} 1. Qxg6 $1 (1. Qxh7 $2 Kf7 2. Kg2 Qxf4 3. Qh3 Qxd2+ 4. Kf1 Qxg5) (1. Qf3 $2 Qxf4 2. Qxf4 Nxf4+ 3. Kg3 Ng6 4. Bg2 Ke7 5. Bf1 Nf8 6. Kf4 g6) 1... hxg6 2. Kg3 Qe8 3. Kf2 $1 Kf7 4. Bf3 (4. Bg2 $1 {<cook MC>}) 4... a5 5. Bg2 (5. d3 $1 {<cook MC>}) 5... Qh8 6. Kg3 Qh5 7. Bf3 Qh8 8. Bg2 (8. d3 $1 {<cook MC>}) 8... Qa8 9. Kf2 $1 (9. d3 $1 {<cook MC>}) 9... Qa6 10. Bf1 1/2-1/2
[/pgn]

In the Sacconi- study Lc0 and Crystal perform quite well too, if you don't insist on 0.00- near eval in small hardware- time, regards

Here is my usual historic research:

Kubbel's study from 1936 is at the given source by YACPDB, though I had to dig a bit. The issues from 1932 to 1941 of that magazine can be found here (direct link to the ZIP of 1936 issues here). The study Nº 760 is at issue Nº 3, page 93 (the first study of the page). There is a note 'Dedicated to A. A. Troitsky on his 70th birthday' sharing heading with the study Nº 761 by G. M. Kasparyan (white wins in 8/1p6/8/3R3N/2k4K/p7/p7/1N6 w - - 0 1), but belongs to Kasparyan's study, as seen in the solutions of Nº 760 (Kubbel) and Nº 761 (Kasparyan) at issue Nº 8 of 1936, page 256. Coming back to Kubbel's study, the given solution is 1. Rc8+! Kxc8 2. Ba6+ Kb8 3. b7 (Now Black's pieces are pinned, and White must move his king to d7) Bf6+ 4. Kc4 Bd8 5. Kd5 Be7 6. f6! gxf6 7. Ke4 Bd8 8. Kf5 Be7 9. Kg6 d5 10. Kf7 d4 11. Kxe7 d3 12. Kd7 d2 13. bxa8=Q+ Kxa8 14. Kc8 d1=Q 15. Bb7#. This is my translation from Russian language and Cyrilic alphabet. Please note that the original solution was given without sidelines like YACPDB, only the comment that I copied; and also YACPDB moves are different than the original solution.

I could not find neither old issues of L'Italia Scacchistica magazine, nor Campioli's cooks; although the given source in your PGN is quite precise: straight to the point with the exact date and the number of the study.

Regards from Spain.

Ajedrecista.

[peter]

I could not find neither old issues of L'Italia Scacchistica magazine, nor Campioli's cooks; although the given source in your PGN is quite precise: straight to the point with the exact date and the number of the study.

Hi Jesus!
I just quoted the .pgn from HHdbVII, regards