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