Five Engine Crackers

[peter]

(I rarely use the MV mode for puzzle tests to have a minimal comparison with the tournament practice)

E.g. as for komodo MCTS you can let it play in MV mode as well as on single variant, it doesn't cost any time to depth (almost) no matter of number of MV- lines. So if komodo MCTS MV was to play against LC0 with the same numbers of MV- lines for both to be computed, from a certain number of MVs and a certain hardware- TC, I'd rather lay my bets on komodo MCTS.
Let's say from MV 12 upwards and 5' per game downwards without increment, just as for "tournament practice", it all depends on the kind of practice of tournament, as well as on starting positions and of course the pool of engines to compare against.

BTW Eman solves all of the five crackers < 60" at 12x3GHz with Full Analysis Depth 35, switched off nullmove and Pruning Treshold 0
Of course without experience.

[Vinvin]

Overnight analyze with Bluefish-XI (default) on my i7-6*4Ghz.
30 minutes per position, analyze stop if solution is hold 1 more ply.
Each position is tested 7 times.

Summary : all solutions was found each time except number 2, only one time.
Position 1 : average 34 seconds.
Position 2 : found only one time after 1109 seconds (~18.5 minutes)
Position 3 : average 35 seconds.
Position 4 : average 316 seconds.
Position 5 : average 8.6 seconds.

Code: Select all

  1) Nf1-e3             Nf1-e3  * 13 Seconds
  1) Nf1-e3             Nf1-e3  * 27 Seconds
  1) Nf1-e3             Nf1-e3  * 28 Seconds
  1) Nf1-e3             Nf1-e3  * 30 Seconds
  1) Nf1-e3             Nf1-e3  * 44 Seconds
  1) Nf1-e3             Nf1-e3  * 48 Seconds
  1) Nf1-e3             Nf1-e3  * 50 Seconds

Code: Select all

  2) e5-e6              Bh3-d7   
  2) e5-e6              Bh3-d7   
  2) e5-e6              Bh3-d7   
  2) e5-e6              Bh3-d7   
  2) e5-e6              Bh3-d7   
  2) e5-e6              Bh3-d7   
  2) e5-e6              e5-e6   * 1109 Seconds

Code: Select all

  3) Ne4-d6             Ne4-d6  * 1 Second
  3) Ne4-d6             Ne4-d6  * 161 Seconds
  3) Ne4-d6             Ne4-d6  * 4 Seconds
  3) Ne4-d6             Ne4-d6  * 5 Seconds
  3) Ne4-d6             Ne4-d6  * 6 Seconds
  3) Ne4-d6             Ne4-d6  * 63 Seconds
  3) Ne4-d6             Ne4-d6  * 7 Seconds

Code: Select all

  4) Ra3xc3             Ra3xc3  * 111 Seconds
  4) Ra3xc3             Ra3xc3  * 1121 Seconds
  4) Ra3xc3             Ra3xc3  * 131 Seconds
  4) Ra3xc3             Ra3xc3  * 290 Seconds
  4) Ra3xc3             Ra3xc3  * 382 Seconds
  4) Ra3xc3             Ra3xc3  * 86 Seconds
  4) Ra3xc3             Ra3xc3  * 92 Seconds

Code: Select all

  5) Kg2-g3             Kg2-g3  * 11 Seconds
  5) Kg2-g3             Kg2-g3  * 16 Seconds
  5) Kg2-g3             Kg2-g3  * 2 Seconds
  5) Kg2-g3             Kg2-g3  * 6 Seconds
  5) Kg2-g3             Kg2-g3  * 7 Seconds
  5) Kg2-g3             Kg2-g3  * 9 Seconds
  5) Kg2-g3             Kg2-g3  * 9 Seconds

[Glarean]

Overnight analyze with Bluefish-XI (default) on my i7-6*4Ghz.
30 minutes per position, analyze stop if solution is hold 1 more ply.
Each position is tested 7 times.

Summary : all solutions was found each time except number 2, only one time.
Position 1 : average 34 seconds.
Position 2 : found only one time after 1109 seconds (~18.5 minutes)
Position 3 : average 35 seconds.
Position 4 : average 316 seconds.
Position 5 : average 8.6 seconds.

Thanks for your tests.
Remarkable: The quite large fluctuations of the solution times within an engine.
How many threads were in use?

[MikeB]

I want to complete the PGNs with other sources

Why??
I don't like having my posts "rewritten". And if all my work, all my research and PGN-commentary is ruined... Bring your own puzzles here, please.

.

Nothing you did was ruined. No need to be so rude.

[MikeB]

Hello Walter:

Thank you very much! They are hard problems indeed. I want to complete the PGNs with other sources:

************************

Problem #1:

5N1n/3P1p1p/5P1k/1Pp1P2p/4KP1P/2p5/p4b2/5N2 w - - 0 1

www.arves.org - Formela, Michał 1977

[pgn]
[Event "Polski Związek Szachowy 2019 (nr 1856, stipulation: draw)"]
[Site ""]
[Date "2019.08.20 (publication)"]
[Round ""]
[White "Michał Formela"]
[Black ""]
[Result "1/2-1/2"]
[FEN "5N1n/3P1p1p/5P1k/1Pp1P2p/4KP1P/2p5/p4b2/5N2 w - - 0 1"]
[SetUp "1"]

1. Ne3 $1 (1. d8=Q $2 1... a1=Q 2. Ne6 (2. Qd3 Qa8+ $19) (2. Nd7 Ng6 3. Qg8 Qa4+ 4. Kd5 Nxf4+ 5. Kd6 Qd4+ 6. Ke7 Ng6+ 7. Ke8 Bxh4 8. Qxf7 Qe4 9. Qg7+ Kg5 10. Ne3 (10. Qxh7 c2 $19) 10... Kf4 11. Qxh7 Kxe3 12. b6 (12. Qxh5 c2 13. Qh6+ Nf4 $19) 12... Bxf6 13. Nxf6 Qxe5+ 14. Kf7 Nf4 $19) 2... Qe1+ 3. Kd5 (3. Kd3 Qxf1+ $19) 3... Qd1+ 4. Ke4 Qe2+ 5. Kd5 Qd3+ 6. Kc6 Qxd8 7. Nxd8 c2 8. b6 c1=Q 9. b7 Qb2 10. Kc7 c4 11. b8=Q Qxb8+ 12. Kxb8 Kg6 $19 {example} 13. Nc6 Kf5 14. Kc7 c3 15. Nb4 Ng6 16. Kd6 Bxh4 17. Kd5 Bf2 18. Kc4 Nxf4 19. Kxc3 Be1+ 20. Kc4 Bxb4 21. Kxb4 Kxe5) 1... Bxe3 2. Ng6 $3 (2. d8=Q $2 2... a1=Q 3. Ne6 (3. Qd3 Bd4 $19) (3. Nd7 Ng6 4. Qg8 Qh1+ 5. Kxe3 Qg1+ 6. Ke4 Qd4+ 7. Kf3 Nxh4+ 8. Ke2 Qd2+ $19) 3... Qh1+ 4. Kxe3 c2 5. Qf8+ Kg6 6. Qg7+ Kf5 7. Qxh7+ Kxe6 8. Qxc2 Qh3+ 9. Kd2 Qh2+ 10. Kd3 Qxc2+ 11. Kxc2 Ng6 12. b6 Kd7 $19) 2... Nxg6 (2... a1=Q 3. Ne7 $11) 3. d8=N $1 3... Nh8 (3... Nxe5 $5 4. Kxe5 $1 {=}) 4. Nc6 a1=Q 5. Ne7 Qh1+ 6. Kxe3 (6. Kd3 $2 6... c4+ $1 {-+}) 6... Qe1+ 7. Kf3 Qf1+ 8. Ke3 (8. Kg3 $2 8... Qg1+ 9. Kf3 Qg4+ 10. Ke3 c2 $19) 8... Qe1+ 9. Kf3 (9. Kd3 $2 9... Qd2+ 10. Ke4 Qe2+ 11. Kd5 Qg4 $19) 9... Qd1+ 10. Ke3 Qd2+ 11. Kf3 Qd3+ 12. Kf2 Qd4+ 13. Kf3 Qd3+ 14. Kf2 Qg6 $1 15. Ke3 $1 (15. Nxg6 $2 15... Nxg6 $19) 15... c4 $1 (15... Qg3+ 16. Ke4 {/Ke2} 16... Qg4 17. Kd3 Qf3+ 18. Kc2 $11) 16. Nxg6 $1 16... Nxg6 17. b6 Nxf4 18. b7 c2 19. Kd2 Nd3 20. Kxc2 Nb4+ 21. Kc3 Nc6 22. Kxc4 Na5+ 23. Kd5 Nxb7 24. e6 fxe6+ 25. Kxe6 Nd8+ 26. Ke7 Nc6+ 27. Ke8 Ne5 28. f7 Ng6 29. f8=Q+ Nxf8 30. Kxf8 Kg6 31. Ke7 Kf5 32. Kd6 1/2-1/2
[/pgn]

************************

Problem #2:

k7/P4pp1/1P6/2p1P3/2P1n3/p5pB/P4n2/K5b1 w - - 0 1

www.arves.org - Horning, Gerd 1964

[pgn]
[Event "Problem Paradise"]
[Site ""]
[Date "2004"]
[Round ""]
[White "Gerd Horning"]
[Black ""]
[Result "1-0"]
[SetUp "1"]
[FEN "k7/P4pp1/1P6/2p1P3/2P1n3/p5pB/P4n2/K5b1 w - - 0 1"]
[PlyCount "17"]
[EventDate "2004"]

1. e6 $1 (1. Bg2 $2 f5 $1 2. e6 Ng4 3. e7 Ngf6 4. Kb1 Be3 5. Kc2 Bd2 6. Kd3 Ba5) 1... fxe6 (1... Nxh3 2. exf7 Bd4+ 3. Kb1 Nd2+ 4. Kc2 ) (1... f5 2. e7 Nf6 3. Bxf5) 2. Bg2 $1 Kb7 3. Kb1 e5 4. Kc2 g6 5. Kb3 g5 6. Kxa3 g4 7. Ka4 Bh2 8. Kb5 Bg1 9. a4 1-0
[/pgn]

************************

Problem #3:

2k5/p2p4/1P6/P3p3/1q2N3/2p5/K7/7Q w - - 0 1

https://www.yacpdb.org/#289487

[pgn]
[Event "Шахматная поэзия. 1st Honorable Mention. Шахматная поэзия, 2001 (1101)"]
[Site ""]
[Date "2001"]
[Round ""]
[White "Бондарь, Иван Михайлович"]
[Black ""]
[Result "1-0"]
[SetUp "1"]
[FEN "2k5/p2p4/1P6/P3p3/1q2N3/2p5/K7/7Q"]
[PlyCount "21"]
[EventDate "2001"]

1. Nd6+ $1 Qxd6 (1... Kd8 2. Qh8+ Ke7 3. Qg7+ Ke6 4.
Qf7+ Kxd6 5. Qf8+) 2. Qa8+ Qb8 3. b7+ Kc7 4. a6 $1 d5
$1 5. Ka3 $1 e4 6. Kb3 d4 7. Kc2 e3 8. Kd3 e2 9. Kxe2
c2 10. Kd2 d3 11. Kc1 1-0
[/pgn]

------------

2k5/p2p4/1P6/P3p3/1q2N3/2p5/K7/7Q w - - 0 1

http://elearning.usm.md/endgame/pgnlive ... ?pid=15212

[pgn]
[Event "1 Honorable Mention ts98#1101 {m} ? 2001"]
[Site ""]
[Date "2001"]
[Round ""]
[White "Bondar I"]
[Black ""]
[Result "1-0"]
[SetUp "1"]
[FEN "2k5/p2p4/1P6/P3p3/1q2N3/2p5/K7/7Q"]
[PlyCount "21"]
[EventDate "2001"]

1. Nd6+! Qxd6
( 1... Kd8 2. Qh8+ Ke7 3. Qg7+ Ke6 4. Qf7+ Kxd6 5. Qf8+ )
2. Qa8+ Qb8 3. b7+ Kc7 4. a6! d5! 5. Ka3! e4 6. Kb3 d4 7. Kc2 e3 8. Kd3 e2 9. Kxe2 c2 10. Kd2 d3 11. Kc1 1-0
[/pgn]

************************

Problem #4:

7k/pp1pBp1N/1p3Pp1/b3K1PR/P3P2p/R1n4P/2P1N1P1/3q4 w - - 0 1

https://www.yacpdb.org/#289941

[pgn]
[Event "Уральский проблемист, 2001 (1598)"]
[Site ""]
[Date "2001"]
[Round ""]
[White "Josten, Gerhard"]
[Black ""]
[Result "1-0"]
[SetUp "1"]
[FEN "7k/pp1pBp1N/1p3Pp1/b3K1PR/P3P2p/R1n4P/2P1N1P1/3q4 w - - 0 1"]
[PlyCount "19"]
[EventDate "2001"]

1. Rxc3 Bxc3+ 2. Nxc3 Qxh5 3. Bf8 Qxh7 4. Bg7+ Kg8 5.
Kd4 Qh5 6. Bh6 a6 7. Kd3 b5 8. a5 b4 9. Ne2 Kh7 10.
Kd2 1-0
[/pgn]

------------

7k/pp1pBp1N/1p3Pp1/b3K1PR/P3P2p/R1n4P/2P1N1P1/3q4 w - - 0 1

http://elearning.usm.md/endgame/pgnlive ... ?pid=15666

[pgn]
[Event "tu18#1598 {m} ? 2001"]
[Site ""]
[Date "2001"]
[Round ""]
[White "Josten G"]
[Black ""]
[Result "1-0"]
[SetUp "1"]
[FEN "7k/pp1pBp1N/1p3Pp1/b3K1PR/P3P2p/R1n4P/2P1N1P1/3q4 w - - 0 1"]
[PlyCount "19"]
[EventDate "2001"]

1. Rxc3 Bxc3+ 2. Nxc3 Qxh5 3. Bf8 Qxh7 4. Bg7+ Kg8 5. Kd4 Qh5 6. Bh6 a6 7. Kd3 b5 8. a5 b4 9. Ne2 Kh7 10. Kd2 1-0
[/pgn]

************************

Problem #5:

4kb2/Rpn1p1rP/1P1pBPN1/4p3/4P1Qn/3b4/1r2R1K1/3qN3 w - - 0 1

www.arves.org - Formela, Michał 1977

[pgn]
[Event "11th International Internet Tournament UAPA 2020, section B2, study nr 24, stipulation: draw"]
[Site ""]
[Date "2020.04.29 (publication)"]
[Round ""]
[White "Michał Formela"]
[Black ""]
[Result "1/2-1/2"]
[FEN "4kb2/Rpn1p1rP/1P1pBPN1/4p3/4P1Qn/3b4/1r2R1K1/3qN3 w - - 6 1"]
[SetUp "1"]

1. Kg3 $1 {Mate threat 2. Bf7+ Kxf7 3. h8=N+ Kg8 4. f7+ Kh7 5. Qxh4#} (1. Kh3 $2 1... Bxe2 $1 (1... Rxh7 $2 2. bxc7 Nxg6+ 3. Kg3 $18) 2. Bf7+ (2. h8=Q Bxg4+ 3. Bxg4 Rb3+ 4. Kxh4 Qxe1+ $19) 2... Kxf7 3. h8=N+ Kg8 4. Nxe7+ Kh7 5. Qxh4+ Bh5 6. fxg7 Bxg7 7. bxc7 Qe2 8. Qg3 Bg4+ 9. Kh4 Bf6#) (1. Kh1 $2 1... Rxh7 $1 (1... Bxe2 $2 2. Bf7+ Kxf7 3. h8=N+ Kg8 4. Nxe7+ Kh7 5. Qxh4+ Bh5 6. fxg7 Bxg7 7. bxc7 Qe2 8. Kg1 Rb1 9. c8=Q $11) 2. bxc7 (2. Nxh4 Rxh4+ 3. Qxh4 Qxe2 $19) 2... Nf3+ 3. Nh4 Qxe1+ 4. Rxe1 Rh2#) (1. Kg1 $2 1... Nf3+ $1 (1... Bxe2 $2 2. Bf7+ Kxf7 3. h8=N+ Kg8 4. f7+ Kh7 5. Qxh4+ Bh5 6. bxc7 $18) (1... Rxg6 $2 2. Qxg6+ Nxg6 3. bxc7 $18) (1... Nxe6 $2 2. fxg7 Bxg7 3. Qxh4 $18) 2. Kh1 Qxe1+ 3. Rxe1 Rh2#) 1... Bxe2 (1... Qxe1+ 2. Rxe1 Rg2+ 3. Kh3 $18) (1... Rxg6 2. bxc7 Rxg4+ 3. Kh3 $18) (1... Nxe6 2. Qxe6 Rxg6+ 3. Kh3 $18) (1... Bc4 2. bxc7 Rb3+ 3. Kf2 Rf3+ 4. Qxf3 Bxe6 5. fxg7 $18) (1... Rxh7 2. bxc7 Qxe1+ 3. Rxe1 Rg2+ 4. Kh3 $18) (1... Nf5+ 2. Qxf5 Nxe6 3. fxg7 $18) 2. Nf3 Bxf3 (2... Nxe6 3. fxg7 Bxg7 4. Qxe6 $18) 3. Ra8+ Nxa8 4. Bf7+ Kxf7 (4... Kd8 5. fxe7+ Bxe7 6. h8=Q+ Rg8 7. Qxg8+ Bf8 8. Qxf8#) 5. h8=N+ Kg8 (5... Kxf6 6. Qxh4+ Ke6 7. Qh3+ Bg4 8. Nxf8+ Kf6 9. Qh6+ Rg6 10. Qxg6#) (5... Ke8 6. Qc8#) 6. f7+ Kh7 (6... Rxf7 7. Nxe7+ Kh7 8. Qg8+ Kh6 9. Nxf7+ Kh5 10. Qg5#) 7. Qxh4+ (7. Nxf8+ $2 7... Kxh8 $19 (7... Kh6 $2 8. Qxg7+ Kxg7 9. Ne6+ Kh7 10. Ng5+ Kg7 11. Ne6+ Kf6 12. f8=Q+ Kxe6 13. Qc8+ Kf6 14. Qf8+ Ke6 $11)) 7... Bh5 8. Qxh5+ Qxh5 {stalemate} 1/2-1/2
[/pgn]

------------------------

I copied the information of PGNs from Arves just clicking at c8 square of the board. Arves has the same pgn4web script than Talkchess.

Regards from Spain.

Ajedrecista.

Thank you Ajedrecista!

[Vinvin]

Overnight analyze with Bluefish-XI (default) on my i7-6*4Ghz.
30 minutes per position, analyze stop if solution is hold 1 more ply.
Each position is tested 7 times.

Summary : all solutions was found each time except number 2, only one time.
Position 1 : average 34 seconds.
Position 2 : found only one time after 1109 seconds (~18.5 minutes)
Position 3 : average 35 seconds.
Position 4 : average 316 seconds.
Position 5 : average 8.6 seconds.

Thanks for your tests.
Remarkable: The quite large fluctuations of the solution times within an engine.
How many threads were in use?

6 threads.
I've started SF with 5 min per positions.

[Vinvin]

Stockfish_20060117 on my i7-6*4Ghz.
5 minutes per position, analyze stop if solution is hold 1 more ply.
Each position is tested 7 times.
Positions #2 and #4 are clearly harder than others.
And #5 is clearly the easiest.

Code: Select all

  1) Nf1-e3             Nf1-e3  * 132 Seconds
  1) Nf1-e3             Nf1-e3  * 29 Seconds
  1) Nf1-e3             Nf1-e3  * 32 Seconds
  1) Nf1-e3             Nf1-e3  * 90 Seconds
  1) Nf1-e3             Nf8-e6   
  1) Nf1-e3             d7-d8Q   
  1) Nf1-e3             d7-d8Q 

Code: Select all

  2) e5-e6              Bh3-d7   
  2) e5-e6              Bh3-d7   
  2) e5-e6              Bh3-d7   
  2) e5-e6              Bh3-d7   
  2) e5-e6              Bh3-d7   
  2) e5-e6              Bh3-d7   
  2) e5-e6              Bh3-d7   

Code: Select all

  3) Ne4-d6             Ne4-d6  * 10 Seconds
  3) Ne4-d6             Ne4-d6  * 11 Seconds
  3) Ne4-d6             Ne4-d6  * 12 Seconds
  3) Ne4-d6             Ne4-d6  * 19 Seconds
  3) Ne4-d6             Ne4-d6  * 25 Seconds
  3) Ne4-d6             Ne4-d6  * 6 Seconds
  3) Ne4-d6             Qh1-h8   

Code: Select all

  4) Ra3xc3             Nh7-f8   
  4) Ra3xc3             Nh7-f8   
  4) Ra3xc3             Nh7-f8   
  4) Ra3xc3             Nh7-f8   
  4) Ra3xc3             Nh7-f8   
  4) Ra3xc3             Nh7-f8   
  4) Ra3xc3             Nh7-f8   

Code: Select all

  5) Kg2-g3             Kg2-g3  * 11 Seconds
  5) Kg2-g3             Kg2-g3  * 12 Seconds
  5) Kg2-g3             Kg2-g3  * 22 Seconds
  5) Kg2-g3             Kg2-g3  * 22 Seconds
  5) Kg2-g3             Kg2-g3  * 4 Seconds
  5) Kg2-g3             Kg2-g3  * 7 Seconds
  5) Kg2-g3             Kg2-g3  * 8 Seconds

[Vinvin]

Corchess_V6 on my i7-6*4Ghz.
5 minutes per position, analyze stop if solution is hold 1 more ply.
Each position is tested 7 times.
Positions #2 and #4 are clearly harder than others.
And #5 is clearly the easiest.

Code: Select all

  1) Nf1-e3             Nf1-e3  * 120 Seconds
  1) Nf1-e3             Nf1-e3  * 146 Seconds
  1) Nf1-e3             Nf1-e3  * 15 Seconds
  1) Nf1-e3             Nf1-e3  * 26 Seconds
  1) Nf1-e3             Nf1-e3  * 41 Seconds
  1) Nf1-e3             Nf1-e3  * 44 Seconds
  1) Nf1-e3             Nf1-e3  * 87 Seconds

Code: Select all

  2) e5-e6              Bh3-d7   
  2) e5-e6              Bh3-d7   
  2) e5-e6              Bh3-d7   
  2) e5-e6              Bh3-d7   
  2) e5-e6              Bh3-d7   
  2) e5-e6              Bh3-d7   
  2) e5-e6              e5-e6   * 253 Seconds

Code: Select all

  3) Ne4-d6             Ne4-d6  * 134 Seconds
  3) Ne4-d6             Ne4-d6  * 17 Seconds
  3) Ne4-d6             Ne4-d6  * 17 Seconds
  3) Ne4-d6             Ne4-d6  * 22 Seconds
  3) Ne4-d6             Ne4-d6  * 49 Seconds
  3) Ne4-d6             Ne4-d6  * 62 Seconds
  3) Ne4-d6             Ne4-d6  * 63 Seconds 

Code: Select all

  4) Ra3xc3             Nh7-f8   
  4) Ra3xc3             Nh7-f8   
  4) Ra3xc3             Ra3xc3  * 155 Seconds
  4) Ra3xc3             Ra3xc3  * 166 Seconds
  4) Ra3xc3             Ra3xc3  * 167 Seconds
  4) Ra3xc3             Ra3xc3  * 196 Seconds
  4) Ra3xc3             Ra3xc3  * 70 Seconds

Code: Select all

  5) Kg2-g3             Kg2-g3  * 10 Seconds
  5) Kg2-g3             Kg2-g3  * 15 Seconds
  5) Kg2-g3             Kg2-g3  * 27 Seconds
  5) Kg2-g3             Kg2-g3  * 28 Seconds
  5) Kg2-g3             Kg2-g3  * 31 Seconds
  5) Kg2-g3             Kg2-g3  * 38 Seconds
  5) Kg2-g3             Kg2-g3  * 9 Seconds

[Vinvin]

Sting-sf-21 on my i7-6*4Ghz.
5 minutes per position, analyze stop if solution is hold 1 more ply.
Each position is tested 7 times.
#3 and #4 very easy. #1 never found.

Code: Select all

  1) Nf1-e3             d7-d8Q   
  1) Nf1-e3             d7-d8Q   
  1) Nf1-e3             d7-d8Q   
  1) Nf1-e3             d7-d8Q   
  1) Nf1-e3             d7-d8Q   
  1) Nf1-e3             d7-d8Q   
  1) Nf1-e3             d7-d8Q   

Code: Select all

  2) e5-e6              Bh3-d7   
  2) e5-e6              Bh3-d7   
  2) e5-e6              Bh3-d7   
  2) e5-e6              Bh3-d7   
  2) e5-e6              e5-e6   * 221 Seconds
  2) e5-e6              e5-e6   * 66 Seconds

Code: Select all

  3) Ne4-d6             Ne4-d6  * 0 Seconds
  3) Ne4-d6             Ne4-d6  * 0 Seconds
  3) Ne4-d6             Ne4-d6  * 0 Seconds
  3) Ne4-d6             Ne4-d6  * 0 Seconds
  3) Ne4-d6             Ne4-d6  * 0 Seconds
  3) Ne4-d6             Ne4-d6  * 0 Seconds

Code: Select all

  4) Ra3xc3             Ra3xc3  * 0 Seconds
  4) Ra3xc3             Ra3xc3  * 0 Seconds
  4) Ra3xc3             Ra3xc3  * 0 Seconds
  4) Ra3xc3             Ra3xc3  * 0 Seconds
  4) Ra3xc3             Ra3xc3  * 0 Seconds
  4) Ra3xc3             Ra3xc3  * 3 Seconds

Code: Select all

  5) Kg2-g3             Kg2-g3  * 11 Seconds
  5) Kg2-g3             Kg2-g3  * 13 Seconds
  5) Kg2-g3             Kg2-g3  * 16 Seconds
  5) Kg2-g3             Kg2-g3  * 18 Seconds
  5) Kg2-g3             Kg2-g3  * 2 Seconds
  5) Kg2-g3             Kg2-g3  * 32 Seconds

[zullil]

Stockfish_20060117 on my i7-6*4Ghz.
5 minutes per position, analyze stop if solution is hold 1 more ply.
Each position is tested 7 times.
Positions #2 and #4 are clearly harder than others.
And #5 is clearly the easiest.

Code: Select all

  4) Ra3xc3             Nh7-f8   
  4) Ra3xc3             Nh7-f8   
  4) Ra3xc3             Nh7-f8   
  4) Ra3xc3             Nh7-f8   
  4) Ra3xc3             Nh7-f8   
  4) Ra3xc3             Nh7-f8   
  4) Ra3xc3             Nh7-f8   

Stockfish-dev can solve #4:

info depth 56 seldepth 78 multipv 1 score cp 10 lowerbound nodes 11093921479 nps 51199800 hashfull 800 tbhits 0 time 216679 pv a3c3
info depth 55 currmove a3c3 currmovenumber 1
info depth 56 seldepth 78 multipv 1 score cp 20 lowerbound nodes 11262379608 nps 51186352 hashfull 806 tbhits 0 time 220027 pv a3c3
info depth 54 currmove a3c3 currmovenumber 1
info depth 56 seldepth 78 multipv 1 score cp 35 lowerbound nodes 11407871172 nps 51180241 hashfull 811 tbhits 0 time 222896 pv a3c3
info depth 53 currmove a3c3 currmovenumber 1
info depth 56 seldepth 78 multipv 1 score cp 56 lowerbound nodes 11851552737 nps 51182452 hashfull 828 tbhits 0 time 231555 pv a3c3
info depth 52 currmove a3c3 currmovenumber 1
info depth 56 seldepth 78 multipv 1 score cp 84 lowerbound nodes 12597046694 nps 51217708 hashfull 856 tbhits 0 time 245951 pv a3c3
info depth 51 currmove a3c3 currmovenumber 1
info depth 56 seldepth 78 multipv 1 score cp 122 lowerbound nodes 12822453036 nps 51266844 hashfull 861 tbhits 0 time 250112 pv a3c3
info depth 50 currmove a3c3 currmovenumber 1
info depth 56 seldepth 78 multipv 1 score cp 171 lowerbound nodes 12861569570 nps 51273793 hashfull 861 tbhits 0 time 250841 pv a3c3
info depth 49 currmove a3c3 currmovenumber 1
info depth 56 seldepth 78 multipv 1 score cp 234 lowerbound nodes 12959504625 nps 51294095 hashfull 863 tbhits 0 time 252651 pv a3c3
info depth 48 currmove a3c3 currmovenumber 1
info depth 56 seldepth 78 multipv 1 score cp 316 lowerbound nodes 13086511512 nps 51324080 hashfull 865 tbhits 0 time 254978 pv a3c3
info depth 47 currmove a3c3 currmovenumber 1
info depth 56 seldepth 78 multipv 1 score cp 420 lowerbound nodes 13211112543 nps 51361340 hashfull 867 tbhits 0 time 257219 pv a3c3
info depth 46 currmove a3c3 currmovenumber 1
info depth 56 seldepth 128 multipv 1 score cp 553 lowerbound nodes 15909420737 nps 51861409 hashfull 913 tbhits 0 time 306768 pv a3c3
info depth 45 currmove a3c3 currmovenumber 1
info depth 45 currmove e2c3 currmovenumber 2
info depth 45 currmove h5h4 currmovenumber 3
info depth 45 currmove h7f8 currmovenumber 4
info depth 45 currmove e2f4 currmovenumber 5
info depth 45 currmove e5f4 currmovenumber 6
info depth 45 currmove e7f8 currmovenumber 7
info depth 45 currmove e2d4 currmovenumber 8
info depth 45 currmove g2g3 currmovenumber 9
info depth 45 currmove h5h6 currmovenumber 10
info depth 45 currmove e7b4 currmovenumber 11
info depth 45 currmove e7d8 currmovenumber 12
info depth 45 currmove g2g4 currmovenumber 13
info depth 45 currmove a3a1 currmovenumber 14
info depth 45 currmove e7c5 currmovenumber 15
info depth 45 currmove a3b3 currmovenumber 16
info depth 45 currmove e2g1 currmovenumber 17
info depth 45 currmove e2c1 currmovenumber 18
info depth 45 currmove e2g3 currmovenumber 19
info depth 45 currmove a3a2 currmovenumber 20
info depth 45 currmove e7d6 currmovenumber 21
info depth 56 seldepth 128 multipv 1 score cp 697 nodes 24160608287 nps 53276460 hashfull 974 tbhits 0 time 453495 pv a3c3 d1a1 e5d6 a5c3 d6c7 c3a5 c2c3 a1a4 h5h6 b6b5 c7b8 a4e4 h7f8 h8g8 h6h7 e4e5 b8a8 b7b6 h7g7 g8h8 f8g6 f7g6 f6f7 e5g7 f7f8q g7f8 e7f8 h8g8 f8a3 g8f7 a8a7 f7e6 a7a6 e6f5 a6b5 d7d5 a3c1 f5e4 e2f4 a5c3 f4g6 c3e1 g6f4 e1c3 g5g6 e4f5 f4d5 c3e5 d5e7 f5f6 g6g7 f6g7 c1g5 g7f7 g5h4 f7e6 g2g4 e5b2 e7f5 e6e5 h4g3 e5e4 g3d6 b2f6 h3h4 f6a1 f5g3 e4f3 g4g5 f3g4 g5g6 a1c3 h4h5 c3g7 b5b6 g4g5 b6c5 g7b2 c5d5 g5f6