ChestUCI Database question

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Dann Corbit
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ChestUCI Database question

Post by Dann Corbit »

Does anyone have a mechanical solution (by an engine or by a mate solver) for the following problems from the ChestUCI database:

Code: Select all

qrr1b3/pn2p3/npppp1P1/4pP2/2P2BPp/PPN1P2B/4R2K/2k5 w - - #20;
qnb5/rp1p4/pPpP4/P1P5/2P5/6K1/8/6Nk w - - #51;
qbn5/k1PK1P1p/p5np/Pp5p/5P1p/2p4p/Q7/8 w - - #103;
n7/pPp5/p4p2/5p2/p6p/p6K/3rb3/n6k w - - #110;
Q3b3/1p2q3/1p6/bp4NP/1p6/1p6/1P3PPp/4NK1k w - - #19; --:-- @ C0/R-10/K3/P2/X26;
Q1b4q/2Pp2p1/3P1k1b/6pP/3p1pPp/3P1pBK/5P2/8 w - - #125;
K1RR4/5p2/p1pB4/7n/r1pkpNq1/r1pb2b1/3P1Ppp/6N1 w - - #26; 00:03 @ C2/R1/K3/P11/X43;
8/p1p3Pr/p1p2P2/7p/7k/6p1/p1p3P1/rbK5 w - - #64;
8/R2p1p1k/2p2Pp1/1p4Kb/p7/5p2/5P1P/8 w - - #17; --:-- @ C0/R0/K4/P7/X10;
8/Pk2p1pp/1Pp1P3/KpP5/2p3p1/2Pp4/3P1P1P/8 w - - #66;
8/5ppp/5p2/8/NK6/1B1N4/2rpn1pp/2bk1brq w - - #87;
8/5p1p/B2p1P2/p2P2NP/2rP3N/n5p1/3K1pP1/5kbn w - - #39;
8/4p3/3p4/p5p1/3n2Kp/p3N1p1/rb1N2pr/k1n3Rb w - - #102;
8/2pB1b2/1pP1p1p1/pPb1PkP1/2p2P2/4nK2/p1N1P3/8 w - - #50; --:-- @ C0/R0/K1/P6/X21; 24 seconds (Gustav);
8/2p5/8/8/1p1p1p2/1P1P1P2/8/2kBK3 w - - #47;
8/1p1p2p1/5p1p/5P1P/1p1p1P2/pP1P1P2/P1k1B3/4K3 w - - #82;
7n/5p1b/5Ppp/p1K3P1/k1p3P1/1p2Q3/p4P2/r7 w - - #30;
6n1/4p1P1/4PpP1/1p3p1K/bp3p2/rk2pP2/p1r1P3/B3Q3 w - - #51;
6n1/2p5/r6p/3Q1b1p/2K5/p1b1p1p1/kp3p2/q4r1n w - - #64;
5K1n/5npb/2p1p1pb/6pp/2N1P1P1/2BkNB1P/1p1P4/1r6 w - - #26;
4n3/2p3p1/1pP1p1n1/1P1bP2P/1pp1p1N1/2PkPp2/1P3P2/3NK3 w - - #66;
4N3/B6p/n2p4/rk1P4/p6p/P3Pp1P/3N1P1b/5K2 w - - #31; --:-- @ C16/R0/K1/P4/X16; 4 seconds (Gustav);
2b4b/Pr1p3P/qP1p2Q1/1R1n4/8/n6r/7P/k6K w - - #47;
Those are the only problems from the database that I have not been able to resolve to checkmate.
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F.Huber
Posts: 853
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Location: Austria

Re: ChestUCI Database question

Post by F.Huber »

Dann Corbit wrote:Does anyone have a mechanical solution (by an engine or by a mate solver) for the following problems from the ChestUCI database:
Why did you list the following #26 ? ChestUCI solves it in 3 seconds:
K1RR4/5p2/p1pB4/7n/r1pkpNq1/r1pb2b1/3P1Ppp/6N1 w - - #26; 00:03 @ C2/R1/K3/P11/X43;

Here are solutions for the 2 problems solved by 'Gustav':
(sorry for the German movelist, that's the usual Gustav output)

4N3/B6p/n2p4/rk1P4/p6p/P3Pp1P/3N1P1b/5K2 w - - #31; --:-- @ C16/R0/K1/P4/X16; 4 seconds (Gustav);
1.Kf1-e1 Lh2-e5 2.Ke1-d1 Le5-h2 3.Kd1-c1 Lh2-e5 4.Kc1-b1 Le5-h2 5.Kb1-b2 Lh2-e5 6.Kb2-c1 Le5-h2 7.Kc1-d1 Lh2-e5 8.Kd1-e1 Le5-h2 9.Ke1-f1 Bh7-h6 10.Kf1-e1 Lh2-e5 11.Ke1-d1 Le5-h2 12.Kd1-c1 Lh2-e5 13.Kc1-b1 Le5-h2 14.Kb1-b2 Lh2-e5 15.Kb2-c1 Le5-h2 16.Kc1-d1 Lh2-e5 17.Kd1-e1 Le5-h2 18.Ke1-f1 Bh6-h5 19.Kf1-e1 Lh2-e5 20.Ke1-d1 Le5-h2 21.Kd1-c1 Lh2-e5 22.Kc1-b1 Le5-h2 23.Kb1-b2 Lh2-e5 24.Kb2-c1 Le5-h2 25.Kc1-d1 Lh2-e5 26.Kd1-e1 Le5-h2 27.Ke1-f1 Lh2-e5 28.Kf1-g1 Le5-g3 29.Bf2-g3 Bf3-f2 30.Kg1-f1 Bh4-g3 31.Se8-d6#

8/2pB1b2/1pP1p1p1/pPb1PkP1/2p2P2/4nK2/p1N1P3/8 w - - #50; --:-- @ C0/R0/K1/P6/X21; 24 seconds (Gustav);
1.Ld7-c8 Lf7-e8 2.Lc8-a6 Le8-f7 3.La6-b7 Lf7-e8 4.Lb7-c8 Le8-f7 5.Lc8-d7 Lf7-g8 6.Ld7-e8 Lg8-h7 7.Le8-f7 Bc4-c3 8.Lf7-e8 Lh7-g8 9.Le8-d7 Lg8-f7 10.Ld7-c8 Lf7-e8 11.Lc8-a6 Le8-f7 12.La6-b7 Lf7-e8 13.Lb7-c8 Le8-f7 14.Lc8-d7 Lf7-g8 15.Ld7-e8 Lg8-h7 16.Le8-f7 Ba5-a4 17.Lf7-e8 Lh7-g8 18.Le8-d7 Lg8-f7 19.Ld7-c8 Lf7-e8 20.Lc8-a6 Le8-f7 21.La6-b7 Lf7-e8 22.Lb7-c8 Le8-f7 23.Lc8-d7 Lf7-g8 24.Ld7-e8 Lg8-h7 25.Le8-f7 Ba4-a3 26.Lf7-e8 Lh7-g8 27.Le8-d7 Lg8-f7 28.Ld7-c8 Lf7-e8 29.Lc8-a6 Le8-f7 30.La6-b7 Lf7-e8 31.Lb7-c8 Le8-f7 32.Lc8-d7 Lf7-g8 33.Ld7-e8 Lg8-h7 34.Le8-f7 a2-a1D 35.Sc2-a1 Bc3-c2 36.Sa1-c2 Ba3-a2 37.Lf7-e8 Lh7-g8 38.Le8-d7 Lg8-f7 39.Ld7-c8 Lf7-e8 40.Lc8-a6 Le8-f7 41.La6-b7 Lf7-e8 42.Lb7-c8 Le8-f7 43.Lc8-d7 Lf7-g8 44.Ld7-e8 Lg8-h7 45.Le8-f7 a2-a1D 46.Sc2-a1 Lc5-a3 47.Sa1-c2 La3-c5 48.Sc2-e1 Lc5-a3 49.Se1-g2 droht 50.Sg2-e3/Sg2-h4#

Franz
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Dann Corbit
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Re: ChestUCI Database question

Post by Dann Corbit »

No idea why the #26 was not solved in my database. Possibly, I forgot to run it?

Here are the two Gustav solutions as PGN:

[Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "1-0"]
[FEN "8/2pB1b2/1pP1p1p1/pPb1PkP1/2p2P2/4nK2/p1N1P3/8 w - - 0 1"]
[SetUp "1"]

1. Bc8 Be8 2. Ba6 Bf7 3. Bb7 Be8 4. Bc8 Bf7 5. Bd7 Bg8 6. Be8 Bh7 7. Bf7 c3
8. Be8 Bg8 9. Bd7 Bf7 10. Bc8 Be8 11. Ba6 Bf7 12. Bb7 Be8 13. Bc8 Bf7 14.
Bd7 Bg8 15. Be8 Bh7 16. Bf7 a4 17. Be8 Bg8 18. Bd7 Bf7 19. Bc8 Be8 20. Ba6
Bf7 21. Bb7 Be8 22. Bc8 Bf7 23. Bd7 Bg8 24. Be8 Bh7 25. Bf7 a3 26. Be8 Bg8
27. Bd7 Bf7 28. Bc8 Be8 29. Ba6 Bf7 30. Bb7 Be8 31. Bc8 Bf7 32. Bd7 Bg8 33.
Be8 Bh7 34. Bf7 a1=Q 35. Nxa1 c2 36. Nxc2 a2 37. Be8 Bg8 38. Bd7 Bf7 39.
Bc8 Be8 40. Ba6 Bf7 41. Bb7 Be8 42. Bc8 Bf7 43. Bd7 Bg8 44. Be8 Bh7 45. Bf7
a1=Q 46. Nxa1 Ba3 47. Nc2 Bc5 48. Ne1 Ba3 49. Ng2 Nf1 50. e4#
1-0

[Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "1-0"]
[FEN "4N3/P6p/n2p4/rk1P4/p6p/P3Pp1P/3N1P1b/5K2 w - - 0 1"]
[SetUp "1"]

1. Ke1 Be5 2. Kd1 Bh2 3. Kc1 Be5 4. Kb1 Bh2 5. Kb2 Be5+ 6. Kc1 Bh2 7. Kd1
Be5 8. Ke1 Bh2 9. Kf1 h6 10. Ke1 Be5 11. Kd1 Bh2 12. Kc1 Be5 13. Kb1 Bh2
14. Kb2 Be5+ 15. Kc1 Bh2 16. Kd1 Be5 17. Ke1 Bh2 18. Kf1 h5 19. Ke1 Be5 20.
Kd1 Bh2 21. Kc1 Be5 22. Kb1 Bh2 23. Kb2 Be5+ 24. Kc1 Bh2 25. Kd1 Be5 26.
Ke1 Bh2 27. Kf1 Be5 28. Kg1 Bg3 29. fxg3 f2+ 30. Kf1 hxg3 31. Nxd6+
1-0
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Eelco de Groot
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Re: ChestUCI Database question

Post by Eelco de Groot »

Hello Dann,

I just tried the first position. It probably is too hard to totally resolve it at least for my hardware and my Stockfish clone. But I did get a winning score. Took some time just to find the first move though. With interactive analysis you probably could find the whole line, eventually, but just letting the engine calculate from the first position it is possible that only a special matefinder would be able to. Looking at some of those the depths to mate, I don't think I will be trying those Mate in 100 moves problems..

[D]qrr1b3/pn2p3/npppp1P1/4pP2/2P2BPp/PPN1P2B/4R2K/2k5 w - -

Engine: Rainbow Serpent 20162803_012 MP (1024 MB)
by T. Romstad, M. Costalba, J. Kiiski, G. Linscott

27/05 0:02 0.00 1.Na2+ Kb1 2.Nc3+ Kc1 (13.875.451) 6258
.
.
.
37/05 4:37 0.00 1.Na2+ Kb1 2.Nc3+ Kc1 (1.602.035.889) 5766

38/05 11:45 0.00 1.Na2+ Kb1 2.Nc3+ Kc1 (3.905.571.938) 5538

39/42 43:04 +0.03++ 1.Bg5 (14.243.312.643) 5511
.
.
.
39/54 79:20 +7.87++ 1.Bg5 (25.352.312.263) 5325

39/63 90:56 +8.23 1.Bg5 e4 2.Nxe4 Nbc5 3.Nc3 Ne4
4.Nxe4 Nb4 5.axb4 c5 6.Nc3 Qe4
7.Nxe4 cxb4 8.Bxe7 Bc6 9.Nxd6 Rg8
10.f6 Rxg6 11.f7 Rg7 12.f8Q Rxf8
13.Bxf8 Rg8 14.Rf2 (29.185.037.914) 5348

40/63 138:59 +8.26++ 1.Bg5 (45.238.724.893) 5424

40/63 140:19 +8.29++ 1.Bg5 (45.676.749.584) 5425

40/63 141:20 +8.35++ 1.Bg5 (46.011.043.931) 5425

40/63 142:38 +8.44++ 1.Bg5 (46.436.430.387) 5425

40/63 143:43 +8.56++ 1.Bg5 (46.774.165.151) 5424

40/63 144:10 +8.74++ 1.Bg5 (46.919.731.836) 5423

40/63 144:51 +8.98++ 1.Bg5 (47.143.406.849) 5423

40/63 146:40 +9.30++ 1.Bg5 (47.731.575.206) 5423

40/63 150:12 +9.72++ 1.Bg5 (48.896.248.757) 5425

40/63 170:48 +10.25++ 1.Bg5 (55.794.523.546) 5444

40/63 213:34 +10.94++ 1.Bg5 (69.907.584.030) 5455

40/74 277:37 +11.43 1.Bg5 e4 2.Nxe4 Nbc5 3.Nc3 Ne4
4.Nxe4 Nb4 5.axb4 c5 6.Nc3 Qe4
7.Nxe4 cxb4 8.Bxe7 Rb7 9.Nxd6 Rxe7
10.Nxc8 Rg7 11.Ra2 Bxg6 12.fxg6 Rxg6
13.Nxa7 Rg7 14.Nc6 (91.585.886.511) 5498
Debugging is twice as hard as writing the code in the first
place. Therefore, if you write the code as cleverly as possible, you
are, by definition, not smart enough to debug it.
-- Brian W. Kernighan
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Ajedrecista
Posts: 1971
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Location: Madrid, Spain.

Re: ChestUCI Database question.

Post by Ajedrecista »

Hello Dann:

I do not have engine solutions of any of these positions. Just for the record, I found the second position here, but it is shown mate in 55 instead of mate in 51.

[pgn][Result "1-0"]
[Setup "1"]
[FEN "qnb5/rp1p4/pPpP4/P1P5/2P5/6K1/8/6Nk w - -"]

1. Kf2 Kh2 2. Ne2 Kh1 3. Nf4 Kh2 4. Kf3 Kh1 5. Ke2 Kg1
6. Ke1 Kh1 7. Kf1 Kh2 8. Kf2 Kh1 9. Ne2 Kh2 10. Ng3
Kh3 11. Nf1 Kg4 12. Ke3 Kf5 (12... Kh4 13. Kf4) 13.
Nh2 Ke5 14. Ng4+ Kf5 15. Kf3 Kg5 16. Ne3 Kh4 17. Kg2
Kh5 18. Kh3 Kg5 19. Kg3 Kh5 (19... Kg6 20. Kf4 Kh5 21.
Nf5 Kg6 22. Ng3 Kf6 23. Nh5+ Kg6 24. Kg4 Kh6 25. Nf4
Kg7 26. Kf5 Kf7 27. Nh5 Kg8 28. Kg6) 20. Nf5 Kg5 21.
Nh4 Kh5 22. Nf3 Kg6 23. Kf4 Kf6 (23... Kh5 24. Kf5 Kh6
25. Ne5 Kh5 26. Ng6 Kh6 27. Nf4 Kg7 28. Kg5 Kf7 29.
Nh5 Ke6 30. Kf4 Kf7 31. Kf5 Kg8 32. Kg6) 24. Ne5 Ke6
25. Ng4 Kf7 26. Kf5 Kg7 27. Ne5 Kh6 28. Kg4 Kh7 29.
Kh5 Kg7 30. Kg5 Kh7 31. Nf7 Kg7 32. Nh6 Kh7 33. Nf5
Kg8 34. Kg6 Kh8 (34... Kf8 35. Nh6) 35. Kf6 $1 Kh7 36.
Kg5 Kh8 37. Kg6 Kg8 38. Nh6+ Kh8 39. Kf6 Kh7 40. Nf7
Kg8 41. Kg6 Kf8 42. Nh6 Ke8 43. Kg7 Kd8 44. Nf5 Ke8
45. Ne7 Kd8 46. Kg8 Ke8 47. Nxc8 Kd8 48. Nxa7 Ke8 49.
Kg7 Kd8 50. Kf7 Qxa7 51. bxa7 Kc8 {eg} 52. a8=Q b5 53.
axb6 a5 54. b7+ Kd8 55. Qxb8# 1-0[/pgn]

You can check other problems at YACPDB.

Regards from Spain.

Ajedrecista.
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Ajedrecista
Posts: 1971
Joined: Wed Jul 13, 2011 9:04 pm
Location: Madrid, Spain.

Re: ChestUCI Database question.

Post by Ajedrecista »

Hello again:

There are other positions at YACPDB:

4th position (checkmate in 110): http://yacpdb.org/#302990 (without solution).

6th position (ckeckmate in 125): http://yacpdb.org/#193611 (with solution).

10th position (checkmate in 66): http://yacpdb.org/#103086 (only the first move).

11th position (checkmate in 87): http://yacpdb.org/#189508 (only the first move).

12th position (checkmate in 39): http://yacpdb.org/#67708 (without solution, but YACPDB says checkmate in 32).

14th position (checkmate in 50): http://yacpdb.org/#192042 (only the first move).

15th position (checkmate in 47): http://yacpdb.org/#327398 (only the first move).

16th position (checkmate in 82): http://yacpdb.org/#191186 (only the first move).

18th position (checkmate in 51): http://yacpdb.org/#335461 (with partial solution, skipping some moves).

19th position (checkmate in 64): http://yacpdb.org/#302978 (with solution).

20th position (checkmate in 26): http://yacpdb.org/#192367 (only the first move).

22nd position (checkmate in 31): http://yacpdb.org/#191779 (with partial solution, skipping some moves).

23rd position (checkmate in 47): http://yacpdb.org/#277992 (with solution).

Regards from Spain.

Ajedrecista.
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Ignacio
Posts: 177
Joined: Wed Mar 08, 2006 8:15 pm

Re: ChestUCI Database question.

Post by Ignacio »

Gustav’s solution (11 sec.) for mate in 26:
1.Kf8-e7 Lh7-g8 2.Ke7-d7 Lg8-h7 3.Kd7-c7 Lh7-g8 4.Kc7-b6 Lg8-h7 5.Kb6-c5 Lh7-g8 6.Kc5-b4 Be6-e5 7.Kb4-c5 Lg8-h7 8.Kc5-b6 Lh7-g8 9.Kb6-c7 Lg8-h7 10.Kc7-d7 Lh7-g8 11.Kd7-e7 Lg8-h7 12.Ke7-f8 Bh5-h4 13.Kf8-e7 Lh7-g8 14.Ke7-d7 Lg8-h7 15.Kd7-c7 Lh7-g8 16.Kc7-b6 Lg8-h7 17.Kb6-c5 Lh7-g8 18.Kc5-b4 Bc6-c5 19.Kb4-c5 Lg8-h7 20.Kc5-b6 Lh7-g8 21.Kb6-c7 Lg8-h7 22.Kc7-d7 Lh7-g8 23.Kd7-e7 Lg8-h7 24.Ke7-f8 Lh7-g8 25.Kf8-g8 Sf7-d6 26.Sc4-e5#

Mate in 19: 1. Qd8 Qxd8 2. Ne4 Qh4 3.Ng3+ Qxg3 4.fg3 Bxh5 5.Kf2 etc.

Mate in 20: is not right.

Mate in 30: 1. Kxc4 Rb1 2. Qe8+ Ka3 3. Qe7+ Ka4 4. Qd7+ Ka3 5. Qd6+ Ka4 6. Qc6+ Ka3 7.Qc5+ Ka4 8. Qb5+ Ka3 9. Qxa5+ Kb2 10. Qc3+ Ka3 11. Qb4+ Kb2 12. Qxb3+ Ka1 13. Qc3+ Rb2 14. Qd4 h5 15. Kd5 Bg8 16. Ke4 Bh7 17. Kf3 Bg8 18. Kg2 Bh7 19.Kf1 h4 20. Kg2 Bg8 21. Kh3 Bh7 22. Kxh4 Bg8 23. Kg3 Bh7 24. Kf4 Bg8 25. Ke5 Bh7 26. Kd6 Bg8 27. Ke7 Bh7 28. Kf8 Bg8 29. Kxg8 Kb1 30. Qd1#
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Ignacio
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Re: ChestUCI Database question.

Post by Ignacio »

Mate in 39: 1. Kd1 h6 2. Nh3 Bh2 3. Nf4 Kg1 4. Nf3+ Kf1 5. Kd2 Bg1 6. Ke3 Bh2 7. Ke4 Bg1 8. Kf5 Bh2 9. Kg4 Bg1 10. Kh3 Bh2 11. Kh4 Bg1 12. Kg4 Bh2 13. Kf5 Bg1 14. Ke4 Bh2 15. Ke3 Bg1 16. Kd2 Bh2 17. Kd1 a4 18. Kd2 Bg1 19. Ke3 Bh2 20.Ke4 Bg1 21. Kf5 Bh2 22. Kg4 Bg1 23. Kh3 Bh2 24. Kh4 Bg1 25. Kg4 Bh2 26. Kf5 Bg1 27. Ke4 Bh2 28. Ke3 Bg1 29. Kd2 Nb1+ 30. Kd3 Na3 31. Bxc4 Nxc4 32. Kxc4 a3 33. Kb3 Bh2 34. Kxa3 Bg1 35. Kb3 Bh2 36. Kc3 Bg1 37. Kc2 Bh2 38. Kd1 Bg1 39. Nd2#
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Ignacio
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Re: ChestUCI Database question.

Post by Ignacio »

For mate in 64: http://www.chessbanter.com/rec-games-ch ... rting.html
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MOBMAT
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Re: ChestUCI Database question

Post by MOBMAT »

Dann Corbit wrote: ↑Mon Jun 06, 2016 9:25 pm Does anyone have a mechanical solution (by an engine or by a mate solver) for the following problems from the ChestUCI database:

Code: Select all

qrr1b3/pn2p3/npppp1P1/4pP2/2P2BPp/PPN1P2B/4R2K/2k5 w - - #20;
qnb5/rp1p4/pPpP4/P1P5/2P5/6K1/8/6Nk w - - #51;
qbn5/k1PK1P1p/p5np/Pp5p/5P1p/2p4p/Q7/8 w - - #103;
n7/pPp5/p4p2/5p2/p6p/p6K/3rb3/n6k w - - #110;
Q3b3/1p2q3/1p6/bp4NP/1p6/1p6/1P3PPp/4NK1k w - - #19; --:-- @ C0/R-10/K3/P2/X26;
Q1b4q/2Pp2p1/3P1k1b/6pP/3p1pPp/3P1pBK/5P2/8 w - - #125;
K1RR4/5p2/p1pB4/7n/r1pkpNq1/r1pb2b1/3P1Ppp/6N1 w - - #26; 00:03 @ C2/R1/K3/P11/X43;
8/p1p3Pr/p1p2P2/7p/7k/6p1/p1p3P1/rbK5 w - - #64;
8/R2p1p1k/2p2Pp1/1p4Kb/p7/5p2/5P1P/8 w - - #17; --:-- @ C0/R0/K4/P7/X10;
8/Pk2p1pp/1Pp1P3/KpP5/2p3p1/2Pp4/3P1P1P/8 w - - #66;
8/5ppp/5p2/8/NK6/1B1N4/2rpn1pp/2bk1brq w - - #87;
8/5p1p/B2p1P2/p2P2NP/2rP3N/n5p1/3K1pP1/5kbn w - - #39;
8/4p3/3p4/p5p1/3n2Kp/p3N1p1/rb1N2pr/k1n3Rb w - - #102;
8/2pB1b2/1pP1p1p1/pPb1PkP1/2p2P2/4nK2/p1N1P3/8 w - - #50; --:-- @ C0/R0/K1/P6/X21; 24 seconds (Gustav);
8/2p5/8/8/1p1p1p2/1P1P1P2/8/2kBK3 w - - #47;
8/1p1p2p1/5p1p/5P1P/1p1p1P2/pP1P1P2/P1k1B3/4K3 w - - #82;
7n/5p1b/5Ppp/p1K3P1/k1p3P1/1p2Q3/p4P2/r7 w - - #30;
6n1/4p1P1/4PpP1/1p3p1K/bp3p2/rk2pP2/p1r1P3/B3Q3 w - - #51;
6n1/2p5/r6p/3Q1b1p/2K5/p1b1p1p1/kp3p2/q4r1n w - - #64;
5K1n/5npb/2p1p1pb/6pp/2N1P1P1/2BkNB1P/1p1P4/1r6 w - - #26;
4n3/2p3p1/1pP1p1n1/1P1bP2P/1pp1p1N1/2PkPp2/1P3P2/3NK3 w - - #66;
4N3/B6p/n2p4/rk1P4/p6p/P3Pp1P/3N1P1b/5K2 w - - #31; --:-- @ C16/R0/K1/P4/X16; 4 seconds (Gustav);
2b4b/Pr1p3P/qP1p2Q1/1R1n4/8/n6r/7P/k6K w - - #47;
Those are the only problems from the database that I have not been able to resolve to checkmate.
still looking for solutions to these?
solved the last one

Code: Select all

FEN: 2b4b/Pr1p3P/qP1p2Q1/1R1n4/8/n6r/7P/k6K w - - 0 1

Stockfish Exp 230420:
...
  61	31:59	 16,540,398k	8,617k	+148.92	1.Qg1+ Ka2 2.Qf2+ Ka1 3.Qf1+ Ka2 4.Qe2+ Nc2 5.Qxc2+ Ka3 6.Qc1+ Ka4 7.Qc4+ Ka3 8.Rb3+ Rxb3 9.Qxa6+ Kb2 10.a8Q Nc3 11.Qxc8 R3xb6 12.Qcxb7 Rxb7 13.Qxb7+ Kc1 14.Qxd7 Kc2 15.Qc8 Bd4 16.h8Q Bxh8 17.Qxh8 Kd3 18.h4 Ne4 19.h5 Ng3+ 20.Kh2 Nf5 21.h6 Nxh6
 62+	32:04	 16,581,961k	8,617k	+149.01	1.Qg1+
 62+	32:14	 16,676,887k	8,622k	+M119	1.Qg1+
 62+	32:19	 16,735,937k	8,628k	+M63	1.Qg1+
 62	32:55	 17,098,992k	8,654k	+M47	1.Qg1+ Ka2 2.Qf2+ Ka1 3.Qf1+ Ka2 4.Qe2+ Ka1 5.Qd1+ Ka2 6.Qxd5+ Ka1 7.Qd1+ Ka2 8.Qe2+ Ka1 9.Qe1+ Ka2 10.Qf2+ Ka1 11.Qg1+ Ka2 12.Qg8+ d5 13.Qxd5+ Ka1 14.Qd1+ Ka2 15.Qd2+ Ka1 16.Qe1+ Ka2 17.Qf2+ Ka1 18.Qg1+ Ka2 19.Qg8+ d5 20.Qxd5+ Ka1 21.Qd1+ Ka2 22.Qe2+ Ka1 23.Qf1+ Ka2 24.Qg2+ Ka1 25.Qg1+ Ka2 26.Qg8+ Be6 27.Qxe6+ Ka1 28.Qe1+ Ka2 29.Qf2+ Ka1 30.Qg1+ Ka2 31.Qg8+ Rb3 32.Qxb3+ Ka1 33.Qd1+ Ka2 34.Qe2+ Ka1 35.Qf1+ Ka2 36.Qg2+ Ka1 37.Qg1+ Ka2 38.Qg8+ Rf7 39.Qxf7+ Ka1 40.Qf1+ Ka2 41.Qf2+ Ka1 42.Qg1+ Ka2 43.Qg8+ Nc4 44.Qxc4+ Ka1 45.Qc1+ Ka2 46.Qc2+ Bb2 47.Qxb2+
 63	34:54	 18,229,481k	8,702k	+M47	1.Qg1+ Ka2 2.Qf2+ Ka1 3.Qf1+ Ka2 4.Qe2+ Ka1 5.Qd1+ Ka2 6.Qxd5+ Ka1 7.Qd1+ Ka2 8.Qe2+ Ka1 9.Qe1+ Ka2 10.Qf2+ Ka1 11.Qg1+ Ka2 12.Qg8+ d5 13.Qxd5+ Ka1 14.Qd1+ Ka2 15.Qd2+ Ka1 16.Qe1+ Ka2 17.Qf2+ Ka1 18.Qg1+ Ka2 19.Qg8+ d5 20.Qxd5+ Ka1 21.Qd1+ Ka2 22.Qe2+ Ka1 23.Qf1+ Ka2 24.Qg2+ Ka1 25.Qg1+ Ka2 26.Qg8+ Rb3 27.Qxb3+ Ka1 28.Qd1+ Ka2 29.Qe2+ Ka1 30.Qe1+ Ka2 31.Qf2+ Ka1 32.Qg1+ Ka2 33.Qg8+ Rf7 34.Qxf7+ Ka1 35.Qf1+ Ka2 36.Qg2+ Ka1 37.Qg1+ Ka2 38.Qg8+ Be6 39.Qxe6+ Ka1 40.Qe1+ Ka2 41.Qf2+ Ka1 42.Qg1+ Ka2 43.Qg8+ Nc4 44.Qxc4+ Ka1 45.Qc1+ Ka2 46.Qc2+ Ka3 47.Qb3+
 64	35:52	 18,761,293k	8,715k	+M47	1.Qg1+ Ka2 2.Qf2+ Ka1 3.Qf1+ Ka2 4.Qe2+ Ka1 5.Qd1+ Ka2 6.Qxd5+ Ka1 7.Qd1+ Ka2 8.Qe2+ Ka1 9.Qe1+ Ka2 10.Qf2+ Ka1 11.Qg1+ Ka2 12.Qg8+ d5 13.Qxd5+ Ka1 14.Qd1+ Ka2 15.Qd2+ Ka1 16.Qe1+ Ka2 17.Qf2+ Ka1 18.Qg1+ Ka2 19.Qg8+ d5 20.Qxd5+ Ka1 21.Qd1+ Ka2 22.Qe2+ Ka1 23.Qf1+ Ka2 24.Qg2+ Ka1 25.Qg1+ Ka2 26.Qg8+ Rb3 27.Qxb3+ Ka1 28.Qd1+ Ka2 29.Qe2+ Ka1 30.Qe1+ Ka2 31.Qf2+ Ka1 32.Qg1+ Ka2 33.Qg8+ Rf7 34.Qxf7+ Ka1 35.Qf1+ Ka2 36.Qg2+ Ka1 37.Qg1+ Ka2 38.Qg8+ Be6 39.Qxe6+ Ka1 40.Qe1+ Ka2 41.Qf2+ Ka1 42.Qg1+ Ka2 43.Qg8+ Nc4 44.Qxc4+ Ka1 45.Qc1+ Ka2 46.Qc2+ Ka3 47.Qb3+
 65	41:59	 22,134,488k	8,786k	+M47	1.Qg1+ Ka2 2.Qf2+ Ka1 3.Qf1+ Ka2 4.Qe2+ Ka1 5.Qd1+ Ka2 6.Qxd5+ Ka1 7.Qd1+ Ka2 8.Qe2+ Ka1 9.Qe1+ Ka2 10.Qf2+ Ka1 11.Qg1+ Ka2 12.Qg8+ d5 13.Qxd5+ Ka1 14.Qd1+ Ka2 15.Qd2+ Ka1 16.Qe1+ Ka2 17.Qf2+ Ka1 18.Qg1+ Ka2 19.Qg8+ d5 20.Qxd5+ Ka1 21.Qd1+ Ka2 22.Qe2+ Ka1 23.Qf1+ Ka2 24.Qg2+ Ka1 25.Qg1+ Ka2 26.Qg8+ Rb3 27.Qxb3+ Ka1 28.Qd1+ Ka2 29.Qe2+ Ka1 30.Qe1+ Ka2 31.Qf2+ Ka1 32.Qg1+ Ka2 33.Qg8+ Rf7 34.Qxf7+ Ka1 35.Qf1+ Ka2 36.Qg2+ Ka1 37.Qg1+ Ka2 38.Qg8+ Be6 39.Qxe6+ Ka1 40.Qe1+ Ka2 41.Qf2+ Ka1 42.Qg1+ Ka2 43.Qg8+ Nc4 44.Qxc4+ Ka1 45.Qc1+ Ka2 46.Qc2+ Ka3 47.Qb3+
 66	41:59	 22,139,372k	8,786k	+M47	1.Qg1+ Ka2 2.Qf2+ Ka1 3.Qf1+ Ka2 4.Qe2+ Ka1 5.Qd1+ Ka2 6.Qxd5+ Ka1 7.Qd1+ Ka2 8.Qe2+ Ka1 9.Qe1+ Ka2 10.Qf2+ Ka1 11.Qg1+ Ka2 12.Qg8+ d5 13.Qxd5+ Ka1 14.Qd1+ Ka2 15.Qd2+ Ka1 16.Qe1+ Ka2 17.Qf2+ Ka1 18.Qg1+ Ka2 19.Qg8+ d5 20.Qxd5+ Ka1 21.Qd1+ Ka2 22.Qe2+ Ka1 23.Qf1+ Ka2 24.Qg2+ Ka1 25.Qg1+ Ka2 26.Qg8+ Rb3 27.Qxb3+ Ka1 28.Qd1+ Ka2 29.Qe2+ Ka1 30.Qe1+ Ka2 31.Qf2+ Ka1 32.Qg1+ Ka2 33.Qg8+ Rf7 34.Qxf7+ Ka1 35.Qf1+ Ka2 36.Qg2+ Ka1 37.Qg1+ Ka2 38.Qg8+ Be6 39.Qxe6+ Ka1 40.Qe1+ Ka2 41.Qf2+ Ka1 42.Qg1+ Ka2 43.Qg8+ Nc4 44.Qxc4+ Ka1 45.Qc1+ Ka2 46.Qc2+ Ka3 47.Qb3+
 67	43:02	 22,727,269k	8,801k	+M47	1.Qg1+ Ka2 2.Qf2+ Ka1 3.Qf1+ Ka2 4.Qe2+ Ka1 5.Qd1+ Ka2 6.Qxd5+ Ka1 7.Qd1+ Ka2 8.Qe2+ Ka1 9.Qe1+ Ka2 10.Qf2+ Ka1 11.Qg1+ Ka2 12.Qg8+ d5 13.Qxd5+ Ka1 14.Qd1+ Ka2 15.Qd2+ Ka1 16.Qe1+ Ka2 17.Qf2+ Ka1 18.Qg1+ Ka2 19.Qg8+ d5 20.Qxd5+ Ka1 21.Qd1+ Ka2 22.Qe2+ Ka1 23.Qf1+ Ka2 24.Qg2+ Ka1 25.Qg1+ Ka2 26.Qg8+ Rb3 27.Qxb3+ Ka1 28.Qd1+ Ka2 29.Qe2+ Ka1 30.Qe1+ Ka2 31.Qf2+ Ka1 32.Qg1+ Ka2 33.Qg8+ Rf7 34.Qxf7+ Ka1 35.Qf1+ Ka2 36.Qg2+ Ka1 37.Qg1+ Ka2 38.Qg8+ Be6 39.Qxe6+ Ka1 40.Qe1+ Ka2 41.Qf2+ Ka1 42.Qg1+ Ka2 43.Qg8+ Nc4 44.Qxc4+ Ka1 45.Qc1+ Ka2 46.Qc2+ Ka3 47.Qb3+
 68	44:03	 23,294,339k	8,812k	+M47	1.Qg1+ Ka2 2.Qf2+ Ka1 3.Qf1+ Ka2 4.Qe2+ Ka1 5.Qd1+ Ka2 6.Qxd5+ Ka1 7.Qd1+ Ka2 8.Qe2+ Ka1 9.Qe1+ Ka2 10.Qf2+ Ka1 11.Qg1+ Ka2 12.Qg8+ d5 13.Qxd5+ Ka1 14.Qd1+ Ka2 15.Qd2+ Ka1 16.Qe1+ Ka2 17.Qf2+ Ka1 18.Qg1+ Ka2 19.Qg8+ d5 20.Qxd5+ Ka1 21.Qd1+ Ka2 22.Qe2+ Ka1 23.Qf1+ Ka2 24.Qg2+ Ka1 25.Qg1+ Ka2 26.Qg8+ Rb3 27.Qxb3+ Ka1 28.Qd1+ Ka2 29.Qe2+ Ka1 30.Qe1+ Ka2 31.Qf2+ Ka1 32.Qg1+ Ka2 33.Qg8+ Rf7 34.Qxf7+ Ka1 35.Qf1+ Ka2 36.Qg2+ Ka1 37.Qg1+ Ka2 38.Qg8+ Be6 39.Qxe6+ Ka1 40.Qe1+ Ka2 41.Qf2+ Ka1 42.Qg1+ Ka2 43.Qg8+ Nc4 44.Qxc4+ Ka1 45.Qc1+ Ka2 46.Qc2+ Ka3 47.Qb3+
 69	46:29	 24,645,287k	8,834k	+M47	1.Qg1+ Ka2 2.Qf2+ Ka1 3.Qf1+ Ka2 4.Qe2+ Ka1 5.Qd1+ Ka2 6.Qxd5+ Ka1 7.Qd1+ Ka2 8.Qe2+ Ka1 9.Qe1+ Ka2 10.Qf2+ Ka1 11.Qg1+ Ka2 12.Qg8+ d5 13.Qxd5+ Ka1 14.Qd1+ Ka2 15.Qd2+ Ka1 16.Qe1+ Ka2 17.Qf2+ Ka1 18.Qg1+ Ka2 19.Qg8+ d5 20.Qxd5+ Ka1 21.Qd1+ Ka2 22.Qe2+ Ka1 23.Qf1+ Ka2 24.Qg2+ Ka1 25.Qg1+ Ka2 26.Qg8+ Rb3 27.Qxb3+ Ka1 28.Qd1+ Ka2 29.Qe2+ Ka1 30.Qe1+ Ka2 31.Qf2+ Ka1 32.Qg1+ Ka2 33.Qg8+ Rf7 34.Qxf7+ Ka1 35.Qf1+ Ka2 36.Qg2+ Ka1 37.Qg1+ Ka2 38.Qg8+ Be6 39.Qxe6+ Ka1 40.Qe1+ Ka2 41.Qf2+ Ka1 42.Qg1+ Ka2 43.Qg8+ Nc4 44.Qxc4+ Ka1 45.Qc1+ Ka2 46.Qc2+ Ka3 47.Qb3+
 70	47:26	 25,169,409k	8,843k	+M47	1.Qg1+ Ka2 2.Qf2+ Ka1 3.Qf1+ Ka2 4.Qe2+ Ka1 5.Qd1+ Ka2 6.Qxd5+ Ka1 7.Qd1+ Ka2 8.Qe2+ Ka1 9.Qe1+ Ka2 10.Qf2+ Ka1 11.Qg1+ Ka2 12.Qg8+ d5 13.Qxd5+ Ka1 14.Qd1+ Ka2 15.Qd2+ Ka1 16.Qe1+ Ka2 17.Qf2+ Ka1 18.Qg1+ Ka2 19.Qg8+ d5 20.Qxd5+ Ka1 21.Qd1+ Ka2 22.Qe2+ Ka1 23.Qf1+ Ka2 24.Qg2+ Ka1 25.Qg1+ Ka2 26.Qg8+ Rb3 27.Qxb3+ Ka1 28.Qd1+ Ka2 29.Qe2+ Ka1 30.Qe1+ Ka2 31.Qf2+ Ka1 32.Qg1+ Ka2 33.Qg8+ Rf7 34.Qxf7+ Ka1 35.Qf1+ Ka2 36.Qg2+ Ka1 37.Qg1+ Ka2 38.Qg8+ Be6 39.Qxe6+ Ka1 40.Qe1+ Ka2 41.Qf2+ Ka1 42.Qg1+ Ka2 43.Qg8+ Nc4 44.Qxc4+ Ka1 45.Qc1+ Ka2 46.Qc2+ Ka3 47.Qb3+
 71	50:38	 26,989,243k	8,881k	+M47	1.Qg1+ Ka2 2.Qf2+ Ka1 3.Qf1+ Ka2 4.Qe2+ Ka1 5.Qd1+ Ka2 6.Qxd5+ Ka1 7.Qd1+ Ka2 8.Qe2+ Ka1 9.Qe1+ Ka2 10.Qf2+ Ka1 11.Qg1+ Ka2 12.Qg8+ d5 13.Qxd5+ Ka1 14.Qd1+ Ka2 15.Qd2+ Ka1 16.Qe1+ Ka2 17.Qf2+ Ka1 18.Qg1+ Ka2 19.Qg8+ d5 20.Qxd5+ Ka1 21.Qd1+ Ka2 22.Qe2+ Ka1 23.Qf1+ Ka2 24.Qg2+ Ka1 25.Qg1+ Ka2 26.Qg8+ Rb3 27.Qxb3+ Ka1 28.Qd1+ Ka2 29.Qe2+ Ka1 30.Qe1+ Ka2 31.Qf2+ Ka1 32.Qg1+ Ka2 33.Qg8+ Rf7 34.Qxf7+ Ka1 35.Qf1+ Ka2 36.Qg2+ Ka1 37.Qg1+ Ka2 38.Qg8+ Be6 39.Qxe6+ Ka1 40.Qe1+ Ka2 41.Qf2+ Ka1 42.Qg1+ Ka2 43.Qg8+ Nc4 44.Qxc4+ Ka1 45.Qc1+ Ka2 46.Qc2+ Ka3 47.Qb3+
i7-6700K @ 4.00Ghz 32Gb, Win 10 Home, EGTBs on PCI SSD
Benchmark: Stockfish15.1 NNUE x64 bmi2 (nps): 1277K
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