Testposition

[Paloma]

[fen]8/8/8/nRp1B3/1Rp1B3/1np2N2/p1p1K3/bbk5 w - - 0 1[/fen]

[peter]

[fen]8/8/8/nRp1B3/1Rp1B3/1np2N2/p1p1K3/bbk5 w - - 0 1[/fen]

Hi!
NIce one, where did you find it?

8/8/8/nRp1B3/1Rp1B3/1np2N2/p1p1K3/bbk5 w - - 0 1

Analysis by The Huntsman 1 bmi2:

1.Rxb3 Nxb3 2.Rxb3 cxb3 3.Bf4+ Kb2 4.Bc1+ Kxc1 5.Ne5 Kb2 6.Nc4+ Kc1 7.Bd5 b2 8.Kf2 Kd1 9.Bf3+ Kc1 10.Bc6 Kd1 11.Ba4 Kc1 12.Bb5 Kd1 13.Ne3+ Kd2 14.Nf1+ Kd1 15.Be2+ Kc1 16.Ne3 Kd2 17.Nc4+ Kc1 18.Na5 c4 19.Bxc4 Kd1 20.Be2+ Kd2 21.Nb3#
+- (#21) Depth: 90/42 00:00:48 2416MN

That's after some Forward- Backward to check the DTM, which doesn't matter much probably, it's not a mate in x- puzzle, is it?

With empty hash started, it took The Huntsman (Jörg Oster) about 15" so get a mate- score with 16x3.5GHz-CPU, tried three times regards

[peter]

8/8/8/nRp1B3/1Rp1B3/1np2N2/p1p1K3/bbk5 w - - 0 1

Analysis by The Huntsman 1 bmi2:

1.Rxb3 Nxb3 2.Rxb3 cxb3 3.Bf4+ Kb2 4.Bc1+ Kxc1 5.Ne5 Kb2 6.Nc4+ Kc1 7.Bd5 b2 8.Kf2 Kd1 9.Bf3+ Kc1 10.Bc6 Kd1 11.Ba4 Kc1 12.Bb5 Kd1 13.Ne3+ Kd2 14.Nf1+ Kd1 15.Be2+ Kc1 16.Ne3 Kd2 17.Nc4+ Kc1 18.Na5 c4 19.Bxc4 Kd1 20.Be2+ Kd2 21.Nb3#
+- (#21) Depth: 90/42 00:00:48 2416MN

Second best so far is latest CorChess with classical search and MultiPV=3, again 30 threads of 16x3.5GHz CPU, 32G hash:


[fen]8/8/8/nRp1B3/1Rp1B3/1np2N2/p1p1K3/bbk5 w - -[/fen]


Engine: CorChess 3 1107220 (32768 MB)
von I. Ivec, the Stockfish developers (see...

Code: Select all

-----------
54/61  9:10   +0.11    1.Txc4 Kb2 2.Txc3 c1S+ 3.Ke3 Ka3 
                       4.Txa5+ Kb4 5.Txa2 Sxa2 6.Txb3+ Kxb3 
                       7.Ld5+ Ka3 8.Lxa1 Sb4 9.Le4 Lxe4 
                       10.Kxe4 Ka4 11.Lg7 Kb5 12.Lf6 Kc4 
                       13.Sd2+ Kb5 14.Lg5 (38.828.459.823) 70548 

54/21  9:10   0.00     1.Txb3 Sxb3 2.Txb3 cxb3 3.Lf4+ Kb2 
                       4.Lc1+ Kxc1 5.Se5 Kb2 6.Sc4+ Kc1 
                       7.Ld5 b2 8.Kf1 Kd1 9.Lf3+ Kc1 (38.828.459.823) 70548 

54/63  9:10   0.00     1.Txc5 Kb2 2.Lxc2 Lxc2 3.Txa5 Kb1 
                       4.Sd4 Lb2 5.Sxc2 Kxc2 6.Ta8 Sc1+ 
                       7.Ke3 Sd3 8.Txc4 Sxe5 9.Tca4 Kb1 
                       10.Txa2 c2 11.Txb2+ Kxb2 12.Tb8+ Kc3 
                       13.Tc8+ Sc4+ 14.Txc4+ (38.828.459.823) 70548 
-----------------
55/62  9:21   +M31     1.Txb3 Sxb3 2.Txb3 cxb3 3.Lf4+ Kb2 
                       4.Lc1+ Kxc1 5.Se5 Kb2 6.Sc4+ Kc1 
                       7.Ld5 b2 8.Kf2 Kd1 9.Lf3+ Kc1 10.Lc6 Kd1 
                       11.La4 Kc1 12.Le8 Kd1 13.Lh5+ Kc1 
                       14.Lg6 (39.635.059.075) 70605 

54/61  9:21   +0.11    1.Txc4 Kb2 2.Txc3 c1S+ 3.Ke3 Ka3 
                       4.Txa5+ Kb4 5.Txa2 Sxa2 6.Txb3+ Kxb3 
                       7.Ld5+ Ka3 8.Lxa1 Sb4 9.Le4 Lxe4 
                       10.Kxe4 Ka4 11.Lg7 Kb5 12.Lf6 Kc4 
                       13.Sd2+ Kb5 14.Lg5 (39.635.059.075) 70605 

54/63  9:21   0.00     1.Txc5 Kb2 2.Lxc2 Lxc2 3.Txa5 Kb1 
                       4.Sd4 Lb2 5.Sxc2 Kxc2 6.Ta8 Sc1+ 
                       7.Ke3 Sd3 8.Txc4 Sxe5 9.Tca4 Kb1 
                       10.Txa2 c2 11.Txb2+ Kxb2 12.Tb8+ Kc3 
                       13.Tc8+ Sc4+ 14.Txc4+ (39.635.059.075) 70605 

[Paloma]

> Nice one, where did you find it?

Hi Peter,
it's from new ACT 5 Suite by dorsz on Open-chess.org

Pos. 55

Code: Select all

 ACT5
 
66 out of 100 = 66% 	- 	Sting 14
60 out of 100 = 60% 	- 	Sting 18
44 out of 100 = 44% 	- 	Houdini 1.5a
42 out of 100 = 42% 	- 	Crystal 260819
42 out of 100 = 42% 	- 	Black Diamond XR7
38 out of 100 = 38% 	- 	Critter 1.6a
38 out of 100 = 38% 	- 	MateFinder 260819

https://dorszcz.blogspot.com/

[peter]

> Nice one, where did you find it?

Hi Peter,
it's from new ACT 5 Suite by dorsz on Open-chess.org

Pos. 55

Code: Select all

 ACT5
 
66 out of 100 = 66% 	- 	Sting 14
60 out of 100 = 60% 	- 	Sting 18
44 out of 100 = 44% 	- 	Houdini 1.5a
42 out of 100 = 42% 	- 	Crystal 260819
42 out of 100 = 42% 	- 	Black Diamond XR7
38 out of 100 = 38% 	- 	Critter 1.6a
38 out of 100 = 38% 	- 	MateFinder 260819

https://dorszcz.blogspot.com/

Thanks again, pity no sources are given there together with the position neither regards

[Dann Corbit]

The position is found on gameknot.

[peter]

The position is found on gameknot.

Ah, yes:

Puzzle #237033: White to move, mate in 21 moves
Created by chesscode: Neweklowsky , Lutz 2020

regards

[Ajedrecista]

Hello:

The position is found on gameknot.

Ah, yes:

Puzzle #237033: White to move, mate in 21 moves
Created by chesscode: Neweklowsky , Lutz 2020

regards

Thank you for providing the source. Disgracefully, the author has been accused of plagiarism many times. The famous web ARVES listed him as Plagiat back in 2015:

https://www.arves.org/arves/images/PDF/ ... _01_05.pdf

And so does other famous web such as Die Schwalbe. Just search the surname on its great chess problem search engine and database:

https://pdb.dieschwalbe.de/

Code: Select all

A='NEWEKLOWSKY'

I have not found an exactly identical, older problem, but I found a similar pattern with some of the pieces (Bf4+, Kb2; Bc1+, Kxc1) thanks to the excellent PDB search engine:

Code: Select all

SOL='Lc1+' AND POSITION='sKc1'

Result: https://pdb.dieschwalbe.de/search.jsp?e ... 1263712%27
Also at YACPDB: https://yacpdb.org/#95524

[pgn][Event "Die Schwalbe, May 1968"]
[Round "Problem No. 2660"]
[White "Nerong, Otto"]
[Black "?"]
[Date "1968.??.??"]
[SetUp "1"]
[FEN "1B6/1P6/8/8/8/ppp5/p1p5/bbk1K3 w - - 0 1"]
[PlyCount "19"]
[Result "1-0"]
1. Bf4+ Kb2 2. Bc1+ Kxc1 3. b8=Q Kb2 4. Qh2 Kc1 5. Ke2 Kb2
6. Kd3 Kc1 7. Qe2 Kb2 8. Kc4 Kc1 9. Kxb3 Bb2 10. Qe1# 1-0[/pgn]

Reprint available in the problem number 076 of Kegelschach by Ebert & Wolfenter (1997):

https://www.hilmar-alquiros.de/Kegelschach.PDF

(Problem at page 294 and solution in the next page).

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

Nerong's problem is also the only problem that I found with Kc1, Ba1, Bb1, Pa2, Pc2 and Pc3 black pieces at the set up position. However, this Neweklowsky's problem could be understood as a new variant of the original pattern rather than a simple plagiarism because it involves other moves: RxN (twice) and checkmating with K+B+N rather than K+Q.

Regards from Spain.

Ajedrecista.

[peter]

Hello:

The position is found on gameknot.

Ah, yes:

Puzzle #237033: White to move, mate in 21 moves
Created by chesscode: Neweklowsky , Lutz 2020

regards

Thank you for providing the source. Disgracefully, the author has been accused of plagiarism many times. The famous web ARVES listed him as Plagiat back in 2015:

https://www.arves.org/arves/images/PDF/ ... _01_05.pdf

And so does other famous web such as Die Schwalbe. Just search the surname on its great chess problem search engine and database:

https://pdb.dieschwalbe.de/

Code: Select all

A='NEWEKLOWSKY'

I have not found an exactly identical, older problem, but I found a similar pattern with some of the pieces (Bf4+, Kb2; Bc1+, Kxc1) thanks to the excellent PDB search engine:

Code: Select all

SOL='Lc1+' AND POSITION='sKc1'

Result: https://pdb.dieschwalbe.de/search.jsp?e ... 1263712%27
Also at YACPDB: https://yacpdb.org/#95524

[pgn][Event "Die Schwalbe, May 1968"]
[Round "Problem No. 2660"]
[White "Nerong, Otto"]
[Black "?"]
[Date "1968.??.??"]
[SetUp "1"]
[FEN "1B6/1P6/8/8/8/ppp5/p1p5/bbk1K3 w - - 0 1"]
[PlyCount "19"]
[Result "1-0"]
1. Bf4+ Kb2 2. Bc1+ Kxc1 3. b8=Q Kb2 4. Qh2 Kc1 5. Ke2 Kb2
6. Kd3 Kc1 7. Qe2 Kb2 8. Kc4 Kc1 9. Kxb3 Bb2 10. Qe1# 1-0[/pgn]

Reprint available in the problem number 076 of Kegelschach by Ebert & Wolfenter (1997):

https://www.hilmar-alquiros.de/Kegelschach.PDF

(Problem at page 294 and solution in the next page).

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

Nerong's problem is also the only problem that I found with Kc1, Ba1, Bb1, Pa2, Pc2 and Pc3 black pieces at the set up position. However, this Neweklowsky's problem could be understood as a new variant of the original pattern rather than a simple plagiarism because it involves other moves: RxN (twice) and checkmating with K+B+N rather than K+Q.

Regards from Spain.

Ajedrecista.

Thank you very much for your further investigations, as often, they are very informative

regards