New update of the ENGINES CRACKERS (3rd version)

[Glarean]

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I have updated my "Engines Crackers", various puzzles have been eliminated as too easy, some new ones have been added.
Analysis and downloads here:
https://glarean-magazin.ch/2021/09/20/c ... s-puzzles/
(The English translation on the top left)

A small sample:

White on move (Stockfish vs LeelaChess)


[fen]r4rn1/2p1q1kn/1p1p1pp1/p2Pp1Pp/2P1PPb1/1P1Q2P1/P1B3K1/1RBN1R2 w[/fen]


Regards: Walter

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[Jouni]

Nice selection. Position 06.


[fen]r1kn4/p7/pP6/2K5/B1R5/1N6/8/3n4 w - - 0 1[/fen]

Analysis by The Huntsman 1:

1.Na5 Nb2 2.Rc2 Nd3+ 3.Kd6+ Kb8 4.b7 Nxb7+ 5.Nxb7 Kxb7 6.Bc6+ Kb6 7.Bxa8 Nb4 8.Rc1 a5 9.Bc6 Nxc6 10.Rxc6+ Kb5 11.Rc7 Kb4 12.Kd5 a6 13.Kd4 Kb3 14.Rb7+ Kc2 15.Kc4 a4 16.Rg7 Kd2 17.Rg3 Kc2 18.Ra3 Kd2 19.Kd4 Ke2 20.Rxa4 Kf3 21.Rxa6 Kf4 22.Ra5 Kf3 23.Rf5+ Kg4 24.Ke4 Kg3 25.Rf4 Kg2 26.Ke3 Kg3 27.Rd4 Kg2 28.Rg4+ Kh3 29.Kf3 Kh2 30.Rh4+ Kg1 31.Rh7 Kf1 32.Rh1#
+- (#32) Depth: 61/66 00:10:28 7228mN

[peter]

Nice selection. Position 06.


[fen]r1kn4/p7/pP6/2K5/B1R5/1N6/8/3n4 w - - 0 1[/fen]

Analysis by The Huntsman 1:

1.Na5 Nb2 2.Rc2 Nd3+ 3.Kd6+ Kb8 4.b7 Nxb7+ 5.Nxb7 Kxb7 6.Bc6+ Kb6 7.Bxa8 Nb4 8.Rc1 a5 9.Bc6 Nxc6 10.Rxc6+ Kb5 11.Rc7 Kb4 12.Kd5 a6 13.Kd4 Kb3 14.Rb7+ Kc2 15.Kc4 a4 16.Rg7 Kd2 17.Rg3 Kc2 18.Ra3 Kd2 19.Kd4 Ke2 20.Rxa4 Kf3 21.Rxa6 Kf4 22.Ra5 Kf3 23.Rf5+ Kg4 24.Ke4 Kg3 25.Rf4 Kg2 26.Ke3 Kg3 27.Rd4 Kg2 28.Rg4+ Kh3 29.Kf3 Kh2 30.Rh4+ Kg1 31.Rh7 Kf1 32.Rh1#
+- (#32) Depth: 61/66 00:10:28 7228mN

Well, yes, but the Major Dual 1.Kd6 isn't much longer as for DTM, is it?
Takes me too long to keep the exakt one in hash way back to starting position, yet I guess something like that might be about right?

r1kn4/p7/pP6/2K5/B1R5/1N6/8/3n4 w - -

1. Kd6+(!?) Kb7 2. Nc5+ Kxb6 3. Be8 Nf7+ 4. Bxf7 Rd8+ 5. Nd7+
Kb5 6. Rc1 Ne3 7. Rc3 Nf5+ 8. Kc7 Rh8 9. Rc5+ Kb4 10. Rxf5
Kc3 11. Rf3+ Kd4 12. Kd6 a5 13. Ra3 Ra8 14. Rxa5 Kc3
15. Ra6 Rd8 16. Rxa7 Kd4 17. Be6 Rh8 18. Ra4+ Ke3 19. Ke5
Rh5+ 20. Bf5 Kd2 21. Ra3 Rh4 22. Be4 Rh6 23. Nc5 Rh8
24. Kd4 Rd8+ 25. Bd5 Ke2 26. Ra2+ Kf1 27. Nd3 Kg1 28. Nf4
Re8 29. Be4 Re7 30. Ke3 Rxe4+ 31. Kxe4 Kf1 32. Ke3 Kg1
33. Kf3 Kh1 34. Kg3 Kg1 35. Ra1# 1-0

[Jouni]

Huntsman mate was surprising: 6 cores only and no takebacks!

[peter]

r1kn4/p7/pP6/2K5/B1R5/1N6/8/3n4 w - -

1. Kd6+(!?) Kb7 2. Nc5+ Kxb6 3. Be8 Nf7+ 4. Bxf7 Rd8+ 5. Nd7+
Kb5 6. Rc1 Ne3 7. Rc3 Nf5+ 8. Kc7 Rh8 9. Rc5+ Kb4 10. Rxf5
Kc3 11. Rf3+ Kd4 12. Kd6 a5 13. Ra3 Ra8 14. Rxa5 Kc3
15. Ra6 Rd8 16. Rxa7 Kd4 17. Be6 Rh8 18. Ra4+ Ke3 19. Ke5
Rh5+ 20. Bf5 Kd2 21. Ra3 Rh4 22. Be4 Rh6 23. Nc5 Rh8
24. Kd4 Rd8+ 25. Bd5 Ke2 26. Ra2+ Kf1 27. Nd3 Kg1 28. Nf4
Re8 29. Be4 Re7 30. Ke3 Rxe4+ 31. Kxe4 Kf1 32. Ke3 Kg1
33. Kf3 Kh1 34. Kg3 Kg1 35. Ra1# 1-0

3...a5 is the biggest stolperstein in Backward, could be quite some moves longer, but I doubt it, this one output of Slowchess after 1.Kd6 Kb7 2.Nc5+ Kxb6 3.Be8 a5:

r2nB3/p7/1k1K4/p1N5/2R5/8/8/3n4 w - -

Engine: SlowChess Blitz 2.8 avx20 (32768 MB)
von Jonathan Kreuzer

31/128 0:09 +M47 4.Tc1 a6 5.Sd7+ Kb5 6.Tb1+ Sb2
7.Txb2+ Kc4 8.Sb6+ Kc3 9.Sa4+ Kd4
10.Ke7 Ke4 11.Td2 Sb7 12.Lc6+ Ke3
13.Lxb7 Th8 14.Tb2 Th7+ 15.Kd6 Th6+
16.Kc7 Th7+ 17.Kb6 (445.298.504) 47933

is a way too long DTM probably, just would have to have some extra- Forward- Backward again, doesn't matter enough to me to go on trying regards

[peter]

Huntsman mate was surprising: 6 cores only and no takebacks!

Yes, impressive. would you like to give it a try with 1.Kd6(!?)?

[Magnum]

Does somebody know which positions were deleted and which are new?

[Jouni]

After 1.Kd6+ Kb7 analysis by The Huntsman 1:

2.Nc5+ Kxb6 3.Be8 a5 4.Rc1 a6 5.Nd7+ Kb5 6.Rb1+ Nb2 7.Rxb2+ Kc4 8.Nb6+ Kc3 9.Na4+ Kd4 10.Ke7 Ne6 11.Bc6 Rc8 12.Bd7 Nc5 13.Bxc8 Nxa4 14.Ra2 Nc5 15.Rxa5 Nb3 16.Ra4+ Ke5 17.Bb7 Nd2 18.Ra5+ Kd4 19.Bd5 Nb1 20.Kd6 Nc3 21.Kc6 Ne2 22.Ra4+ Ke3 23.Rxa6 Nf4 24.Kd6 Nd3 25.Ra3 Kd4 26.Ra4+ Ke3 27.Re4+ Kd2 28.Re7 Kc1 29.Ra7 Kb2 30.Ra5 Kc3 31.Be4 Nf4 32.Ra2 Kd4 33.Ra4+ Kc3 34.Ke5 Ne2 35.Bd5 Nc1 36.Bc4 Kd2 37.Ra3 Kd1 38.Kd4 Kd2 39.Rh3 Kc2 40.Rh2+ Kd1 41.Kc3
+- (54.49) Depth: 67/85 01:23:22 48931mN

[peter]

After 1.Kd6+ Kb7 analysis by The Huntsman 1:

2.Nc5+ Kxb6 3.Be8 a5 4.Rc1 a6 5.Nd7+ Kb5 6.Rb1+ Nb2 7.Rxb2+ Kc4 8.Nb6+ Kc3 9.Na4+ Kd4 10.Ke7 Ne6 11.Bc6 Rc8 12.Bd7 Nc5 13.Bxc8 Nxa4 14.Ra2 Nc5 15.Rxa5 Nb3 16.Ra4+ Ke5 17.Bb7 Nd2 18.Ra5+ Kd4 19.Bd5 Nb1 20.Kd6 Nc3 21.Kc6 Ne2 22.Ra4+ Ke3 23.Rxa6 Nf4 24.Kd6 Nd3 25.Ra3 Kd4 26.Ra4+ Ke3 27.Re4+ Kd2 28.Re7 Kc1 29.Ra7 Kb2 30.Ra5 Kc3 31.Be4 Nf4 32.Ra2 Kd4 33.Ra4+ Kc3 34.Ke5 Ne2 35.Bd5 Nc1 36.Bc4 Kd2 37.Ra3 Kd1 38.Kd4 Kd2 39.Rh3 Kc2 40.Rh2+ Kd1 41.Kc3
+- (54.49) Depth: 67/85 01:23:22 48931mN

Yet after the same first 9 moves

1. Kd6+ Kb7 2. Nc5+ Kxb6 3. Be8 a5 4. Rc1 a6 5. Nd7+ Kb5 6. Rb1+ Nb2 7. Rxb2+ Kc4 8. Nb6+ Kc3 9. Na4+ Kd4 :


[fen]r2nB3/8/p2K4/p7/N2k4/8/1R6/8 w - - 0 1[/fen]


Analysis by The Huntsman 1 bmi2:

10.Ke7 Se6 11.Lc6 Tc8 12.Kd7 Tc7+ 13.Kd6 Tg7 14.Kxe6 Tg6+ 15.Kd7 Tg7+ 16.Kd6 Tg6+ 17.Kc7 Tg7+ 18.Ld7 Tg6 19.Th2 Tf6 20.Th5 Tf2 21.Txa5 Td2 22.Sc5 Ke5 23.Txa6 Tc2 24.Ta5 Th2 25.Se6+ Ke4 26.Lc6+ Kd3 27.Kd6 Tc2 28.Ta4 Kc3 29.Ld5 Tb2 30.Ta3+ Kd2 31.Kc5 Ke1 32.Sf4 Td2 33.Th3 Kd1 34.Sd3 Tc2+ 35.Kd4 Tc8 36.Th1+ Ke2 37.Th2+ Kf1 38.Ke3 Te8+ 39.Le4 Txe4+ 40.Kxe4 Kg1 41.Tf2 Kh1 42.Kf3 Kg1 43.Kg3 Kh1 44.Tf1#
+- (#35) Tiefe: 63/70 00:00:51 2754MN

Don't know, if I'll find the hardware- time for the rest of the first 9 moves keeping DTM in hash at further Backward, but more then the up to here given 44 all in all it won't become after 1.Kd6!? neither, I guess, which to me is reason enough to talk about a major dual.

Edit: Already five moves nearer to root position:

1. Kd6+ Kb7 2. Nc5+ Kxb6 3. Be8 a5 4. Rc1 a6 :


[fen]r2nB3/8/pk1K4/p1N5/8/8/8/2Rn4 w - - 0 1[/fen]


Analysis by The Huntsman 1 bmi2:

5.Nd7+ Kb5 6.Rb1+ Nb2 7.Rxb2+ Kc4 8.Nb6+ Kc3 9.Na4+ Kd4 10.Ke7 Ne6 11.Bc6 Rc8 12.Kd7 Rc7+ 13.Kd6 Rh7 14.Kxe6 Rh6+ 15.Kd7 Rh7+ 16.Kd6 Rh6+ 17.Kc7 Rh7+ 18.Bd7 Rh6 19.Ra2 Kc4 20.Nb6+ Kb4 21.Ra4+ Kc3 22.Rxa5 Kd4 23.Rxa6 Ke4 24.Ra4+ Kf3 25.Nd5 Kf2 26.Bf5 Kf3 27.Kd7 Kf2 28.Be6 Ke2 29.Kd6 Kd3 30.Nf4+ Ke3 31.Ke5 Rh8 32.Ra3+ Kd2 33.Kd4 Rd8+ 34.Bd5 Rc8 35.Rh3 Rd8 36.Rh2+ Kd1 37.Ke3 Re8+ 38.Be4 Kc1 39.Nd3+ Kb1 40.Nb4+ Rxe4+ 41.Kxe4 Ka1 42.Kd4 Kb1 43.Kc3 Ka1 44.Rh1#
+- (#40) Depth: 68/80 00:00:54 3075MN

regards

[peter]

Edit: Already five moves nearer to root position:

1. Kd6+ Kb7 2. Nc5+ Kxb6 3. Be8 a5 4. Rc1 a6 :

And finally back to the root- position itself:


[fen]r1kn4/p7/pP6/2K5/B1R5/1N6/8/3n4 w - - 0 1[/fen]


1. Kd6+(!?)


[fen]r1kn4/p7/pP1K4/8/B1R5/1N6/8/3n4 b - - 0 1[/fen]


Analysis by The Huntsman 1 bmi2:

1...Kb7 2.Nc5+ Kxb6 3.Be8 a5 4.Rc1 a6 5.Nd7+ Kb5 6.Rb1+ Nb2 7.Rxb2+ Kc4 8.Nb6+ Kc3 9.Na4+ Kd4 10.Ke7 Kd3 11.Kd7 Nc6 12.Bg6+ Kd4 13.Kxc6 Rc8+ 14.Kd6 Rd8+ 15.Kc7 Rg8 16.Bf5 Ke5 17.Bd7 Rg1 18.Ra2 Rc1+ 19.Bc6 Rg1 20.Nc5 Rg7+ 21.Bd7 Rg1 22.Rxa5 Rd1 23.Bc6 Kd4 24.Nxa6 Kc3 25.Bd5 Re1 26.Kd6 Re8 27.Be6 Rf8 28.Ra3+ Kb2 29.Rh3 Rd8+ 30.Ke5 Kc2 31.Nc5 Kd2 32.Ne4+ Kc1 33.Bd5 Rc8 34.Kd4 Kb2 35.Nd6 Rc2 36.Nc4+ Ka1 37.Rh1+ Ka2 38.Ne3+ Kb2 39.Nxc2 Kxc2 40.Rh2+ Kd1 41.Bb3+ Ke1 42.Ke3 Kf1 43.Bd5 Kg1
+- (#43) Depth: 70/85 00:01:50 6363MN