Which engines can crack n6r/b7/1R4R1/2k5/2pppppp/8/1PPPPPP1/r4NK1 w - - 0 1 ?

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fkarger
Posts: 39
Joined: Sat Aug 15, 2020 8:08 am
Full name: Frank Karger

Which engines can crack n6r/b7/1R4R1/2k5/2pppppp/8/1PPPPPP1/r4NK1 w - - 0 1 ?

Post by fkarger »

Hi,

recently I ran some test suites.
One position seemed very hard to crack although it is essentially a perpetual.

[d]n6r/b7/1R4R1/2k5/2pppppp/8/1PPPPPP1/r4NK1 w - - 0 1

Author: Korolkov, 1940

Please let me know if you find an engine which can solve it in reasonable time :)

Best regards
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peter
Posts: 3358
Joined: Sat Feb 16, 2008 7:38 am
Full name: Peter Martan

Re: Which engines can crack n6r/b7/1R4R1/2k5/2pppppp/8/1PPPPPP1/r4NK1 w - - 0 1 ?

Post by peter »

fkarger wrote: ↑Mon Apr 14, 2025 2:17 pm Please let me know if you find an engine which can solve it in reasonable time :)
Lc0 with 3070ti GPU and net 6147500PT, 8G NN-cache:

Code: Select all

 
n6r/b7/1R4R1/2k5/2pppppp/8/1PPPPPP1/r4NK1 w - - 0 1

Analysis by Lc0 v0.31.2:

1.Tgc6+ Kd5 
  Schwarz hat entscheidenden Vorteil.  
  -+ (-2.63)  Tiefe: 1/2   00:00:02  2Knoten
...
1.Tgc6+ Kd5 2.Td6+ Ke5 3.Te6+ Kf5 4.Tbc6 g3 5.d3 gxf2+ 6.Kxf2 e3+ 7.Kg1 Tg8 8.Tf6+ Kg5 9.Ta6 Te1 10.Tfe6 Lb6 11.Te5+ Kg4 
  Schwarz steht klar auf Gewinn.  
  -+ (-4.99)  Tiefe: 18/45   00:00:22  97kN
1.b4+ cxb3 2.Tgc6+ Kd5 3.c4+ dxc3 4.Td6+ Ke5 5.d4+ exd3 6.Te6+ Kf5 7.e4+ fxe3 8.Tf6+ Kg5 9.f4+ gxf3 10.Tg6+ Kh5 11.g4+ hxg3 12.Tg5+ Kxg5 13.Tg6+ Kf4 14.Tf6+ Ke4 15.Tf4+ Kd5 16.Tf5+ Kd6 17.Td5+ Kc6 18.Tc5+ Kb7 19.Tc7+ 
  Schwarz steht deutlich besser.  
  -+ (-1.70)  Tiefe: 19/45   00:00:23  101kN
...
1.b4+ cxb3 2.Tgc6+ Kd5 3.c4+ dxc3 4.Td6+ Ke5 5.d4+ exd3 6.Te6+ Kf5 7.e4+ fxe3 8.Tf6+ Kg5 9.f4+ gxf3 10.Tg6+ Kh5 11.g4+ hxg3 12.Tg5+ Kh4 13.Tg4+ Kxg4 14.Tg6+ Kf5 15.Tg5+ Ke6 16.Te5+ Kd7 17.Te7+ Kc6 18.Tc7+ Kb5 19.Tb7+ Sb6 20.Txb6+ Ka4 21.Tb4+ Ka3 
  Schwarz steht deutlich besser.  
  -+ (-1.61)  Tiefe: 27/50   00:00:51  464kN
...
1.b4+ cxb3 2.Tgc6+ Kd5 3.c4+ dxc3 4.Td6+ Ke5 5.d4+ exd3 6.Te6+ Kf5 7.e4+ fxe3 8.Tf6+ Kg5 9.f4+ gxf3 10.Tg6+ Kf4 11.Tgf6+ Ke4 12.Tfe6+ Kd5 13.Ted6+ Kc4 14.Tdc6+ Kd4 15.Td6+ Ke5 16.Te6+ Kf5 17.Tf6+ Kg4 18.Tg6+ Kh5 19.g4+ hxg3 20.Tg5+ Kxg5 21.Tg6+ Kf4 22.Tg4+ Ke5 23.Tg5+ Kd6 24.Td5+ Kc7 25.Td7+ Kb6 26.Tb7+ Ka6 27.Tb6+ 
  Schwarz steht deutlich besser.  
  -/+ (-1.51)  Tiefe: 32/58   00:02:07  1876kN
1.b4+ cxb3 2.Tgc6+ Kd5 3.c4+ dxc3 4.Td6+ Ke5 5.d4+ exd3 6.Te6+ Kf5 7.e4+ fxe3 8.Tf6+ Kg5 9.f4+ gxf3 10.Tg6+ Kf4 11.Tgf6+ Ke4 12.Tfe6+ Kd4 13.Ted6+ Kc5 14.Tdc6+ Kd5 15.Td6+ Ke5 16.Te6+ Kf5 17.Tf6+ Kg4 18.Tg6+ Kh5 19.g4+ hxg3 20.Tg5+ Kxg5 21.Tg6+ Kf4 22.Tg4+ Ke5 23.Tg5+ Kd6 24.Td5+ Kc7 25.Td7+ Kc6 26.Tc7+ Kb5 27.Tb7+ 
  Schwarz steht deutlich besser.  
  -/+ (-1.50)  Tiefe: 32/58   00:02:12  1986kN
...
1.b4+ cxb3 2.Tgc6+ Kd5 3.c4+ dxc3 4.Td6+ Ke5 5.d4+ exd3 6.Te6+ Kf5 7.e4+ fxe3 8.Tf6+ Kg5 9.f4+ gxf3 10.Tg6+ Kf4 11.Tgf6+ Ke4 12.Tfe6+ Kd4 13.Ted6+ Kc5 14.Tdc6+ Kd5 15.Td6+ Ke5 16.Te6+ Kf5 17.Tf6+ Kg4 18.Tg6+ Kh5 19.g4+ hxg3 20.Tg5+ Kh4 21.Tg4+ Kxg4 22.Tg6+ Kf4 23.Tg4+ Ke5 24.Tg5+ Kd6 25.Td5+ Kc7 26.Td7+ Kb6 27.Tb7+ Ka6 28.Tb6+ 
  Schwarz steht deutlich besser.  
  -/+ (-1.46)  Tiefe: 34/62   00:03:18  3573kN
Eval's not so good (not really 0.00- near), but first 10 moves in output show the thematic solution and at least it's best from Black's view with quite some difference to second best ranked one, and it's within +/-, even if at boundary to +- yet.
With already full hash (NN-cache) from single primary before in depth 40:

Code: Select all

 
n6r/b7/1R4R1/2k5/2pppppp/8/1PPPPPP1/r4NK1 w - - 0 1

Analysis by Lc0 v0.31.2:

1. -/+ (-1.46):  1.b4+ cxb3 2.Tgc6+ Kd5 3.c4+ dxc3 4.Td6+ Ke5 5.d4+ exd3 6.Te6+ Kf5 7.e4+ fxe3 8.Tf6+ Kg5 9.f4+ gxf3 10.Tg6+ Kf4 11.Tgf6+ Ke4 12.Tfe6+ Kd4 13.Ted6+ Kc5 14.Tdc6+ Kd5 15.Td6+ Ke5 16.Te6+ Kf5 17.Tf6+ Kg4 18.Tg6+ Kh5 19.g4+ hxg3 20.Tg5+ Kh4 21.Tg4+ Kxg4 22.Tg6+ Kf4 23.Tg4+ Ke5 24.Tg5+ Kd6 25.Td5+ Kc7 26.Td7+ Kb6 27.Tb7+ Ka6 28.Tb6+

2. -+ (-5.14):  1.Tgc6+ Kd5 2.Td6+ Ke5 3.Te6+ Kf5 4.Tbc6 Lc5 5.d3 exd3 6.exd3 h3 7.Tf6+ Ke5 8.gxh3 gxh3 9.Tfe6+ Kd5 10.dxc4+ Kxc4 11.Kh2 Txf1 12.Te5 Txf2+ 13.Kh1 Kb4 14.Tcxc5
HHdbVI:
[pgn][Event "sp.p Shakhmaty v SSSR#155"]
[Site "?"]
[Date "1940.??.??"]
[Round "?"]
[White "Korolkov=V"]
[Black "(=0834.66g1c5)"]
[Result "1/2-1/2"]
[SetUp "1"]
[FEN "n6r/b7/1R4R1/2k5/2pppppp/8/1PPPPPP1/r4NK1 w - - 0 1"]
[PlyCount "42"]
[GameId "2166536190570185"]
[EventDate "1940.??.??"]

{Shakhmaty v SSSR/6 (EG#06734).} 1. b4+ $1 (1. Rgc6+ $2 Kd5 2. Rd6+ Ke5 3. Re6+ Kf5 4. Rf6+ Kg5 5. Rg6+ Kh5) 1... cxb3 (1... Kd5 2. Rg5#) 2. Rgc6+ Kd5 3. c4+ $1 dxc3 (3... Ke5 4. Rc5#) 4. Rd6+ Ke5 (4... Kc5 5. Rdc6+) 5. d4+ $1 exd3 (5... Kf5 6. Rd5#) 6. Re6+ Kf5 7. e4+ $1 fxe3 (7... Kg5 8. Re5#) 8. Rf6+ Kg5 9. f4+ $1 gxf3 (9... Kh5 10. Rf5#) 10. Rg6+ Kh5 11. g4+ $1 hxg3 12. Rg5+ $1 Kxg5 13. Rg6+ $1 Kf5 {<eg>} (13... Kxg6) 14. Rf6+ Ke5 15. Re6+ Kd5 16. Rd6+ Kc4 17. Rc6+ Bc5 18. Rxc5+ Kb4 19. Rb5+ Ka3 20. Rxb3+ Ka4 21. Rb4+ Kxb4 1/2-1/2
[/pgn]
Peter.
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fkarger
Posts: 39
Joined: Sat Aug 15, 2020 8:08 am
Full name: Frank Karger

Re: Which engines can crack n6r/b7/1R4R1/2k5/2pppppp/8/1PPPPPP1/r4NK1 w - - 0 1 ?

Post by fkarger »

Hi Peter,

that is pretty impressive!

With already full hash the line is accurate.
Thank you :)
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Vinvin
Posts: 5282
Joined: Thu Mar 09, 2006 9:40 am
Full name: Vincent Lejeune

Re: Which engines can crack n6r/b7/1R4R1/2k5/2pppppp/8/1PPPPPP1/r4NK1 w - - 0 1 ?

Post by Vinvin »

fkarger wrote: ↑Mon Apr 14, 2025 2:17 pm Hi,

recently I ran some test suites.
One position seemed very hard to crack although it is essentially a perpetual.

[d]n6r/b7/1R4R1/2k5/2pppppp/8/1PPPPPP1/r4NK1 w - - 0 1

Author: Korolkov, 1940

Please let me know if you find an engine which can solve it in reasonable time :)

Best regards
I tested SugaR AI ICCF 2.50, after 4 runs it finds b4 2 times under 20 minutes (AMD 59650x 16 cores, 16 threads used).
34 sec and 5min25sec.

n6r/b7/1R4R1/2k5/2pppppp/8/1PPPPPP1/r4NK1 w - - 0 1

Code: Select all

SugaR AI ICCF 2.50 avx2:
Found 512 tablebases
NNUE evaluation using nn-13406b1dcbe0.nnue enabled
...
 16/43-	00:07	 174.177k	22.780k	-5,27	1.Rgc6+ Kd5
 16/51	00:08	 184.258k	22.770k	-5,39	1.Rgc6+ Kd5 2.Rd6+ Ke5 3.Re6+ Kf5 4.Rf6+ Kg5 5.Rbc6 Bb8 6.f3 exf3 7.Rg6+ Kf5 8.exf3 gxf3 9.Rcf6+ Ke5 10.gxf3 h3 11.Kh2 Kd5 12.d3 cxd3 13.cxd3 Rxf1 14.Ra6 Bc7 15.Rg5+ Be5 16.Ra5+ Kc6 17.Raxe5 Nc7 18.Re2 Re8 19.Rg6+ Kd7 20.Rxe8 Nxe8 21.b4 Nc7 22.b5 Nxb5 23.Kxh3
 17/33	00:08	 199.082k	22.703k	-5,79	1.Rgc6+ Kd5 2.Rd6+ Ke5 3.Re6+ Kf5 4.Rf6+ Kg5 5.Rbc6 Bb8 6.f3 exf3 7.Rg6+ Kf5 8.exf3 gxf3 9.Rcf6+ Ke5 10.gxf3 h3 11.Kh2 Kd5 12.d3 cxd3 13.cxd3 Rxf1 14.Ra6 Bc7 15.Rg5+ Be5 16.Ra5+ Kc6 17.Raxe5
 18/49	00:10	 237.092k	22.323k	-5,79	1.Rgc6+ Kd5 2.Rd6+ Ke5 3.Re6+ Kf5 4.Rf6+ Kg5 5.Rbc6 Bb8 6.Rg6+ Kf5 7.f3 gxf3 8.gxf3 exf3 9.Rcf6+ Ke5 10.exf3 h3 11.Kh2 Kd5 12.d3 Rxf1 13.Ra6 cxd3 14.cxd3 Bc7 15.Rg5+ Be5 16.Ra5+ Kc6 17.Raxe5 Nc7 18.Rg6+ Kb7 19.Rg7 Kb8 20.b4 Rxf3 21.Rc5
 19/54-	00:27	 593.211k	21.206k	-6,01	1.Rgc6+ Kd5
 19/57+	00:34	 720.570k	21.016k	-3,83	1.b4+
 19/57	00:34	 720.622k	21.017k	-3,78	1.b4+ cxb3 2.Rgc6+ Kd5 3.c4+ dxc3 4.Rd6+ Ke5 5.d4+ exd3 6.Re6+ Kf5 7.e4+ fxe3 8.Rf6+ Kg5
 20/16	00:34	 720.928k	21.017k	-3,78	1.b4+ cxb3 2.Rgc6+ Kd5 3.c4+ dxc3 4.Rd6+ Ke5 5.d4+ exd3 6.Re6+ Kf5 7.e4+ fxe3 8.Rf6+ Kg5
 21/16	00:34	 721.106k	21.018k	-3,78	1.b4+ cxb3 2.Rgc6+ Kd5 3.c4+ dxc3 4.Rd6+ Ke5 5.d4+ exd3 6.Re6+ Kf5 7.e4+ fxe3 8.Rf6+ Kg5
 22/16	00:34	 721.187k	21.018k	-3,78	1.b4+ cxb3 2.Rgc6+ Kd5 3.c4+ dxc3 4.Rd6+ Ke5 5.d4+ exd3 6.Re6+ Kf5 7.e4+ fxe3 8.Rf6+ Kg5
 23/17	00:34	 721.293k	21.018k	-3,82	1.b4+ cxb3 2.Rgc6+ Kd5 3.c4+ dxc3 4.Rd6+ Ke5 5.d4+ exd3 6.Re6+ Kf5 7.e4+ fxe3 8.Rf6+ Kg5 9.Rg6+ Kh5
 24/17	00:34	 721.935k	21.016k	-3,86	1.b4+ cxb3 2.Rgc6+ Kd5 3.c4+ dxc3 4.Rd6+ Ke5 5.d4+ exd3 6.Re6+ Kf5 7.e4+ fxe3 8.Rf6+ Kg5 9.Rg6+ Kh5
 25/17	00:34	 722.034k	21.017k	-3,86	1.b4+ cxb3 2.Rgc6+ Kd5 3.c4+ dxc3 4.Rd6+ Ke5 5.d4+ exd3 6.Re6+ Kf5 7.e4+ fxe3 8.Rf6+ Kg5 9.Rg6+ Kh5
 26/17	00:34	 722.144k	21.017k	-3,86	1.b4+ cxb3 2.Rgc6+ Kd5 3.c4+ dxc3 4.Rd6+ Ke5 5.d4+ exd3 6.Re6+ Kf5 7.e4+ fxe3 8.Rf6+ Kg5 9.Rg6+ Kh5
 27/18	00:34	 722.880k	21.015k	-3,86	1.b4+ cxb3 2.Rgc6+ Kd5 3.c4+ dxc3 4.Rd6+ Ke5 5.d4+ exd3 6.Re6+ Kf5 7.e4+ fxe3 8.Rf6+ Kg5 9.Rg6+ Kh5
 28/18	00:34	 723.082k	21.015k	-3,86	1.b4+ cxb3 2.Rgc6+ Kd5 3.c4+ dxc3 4.Rd6+ Ke5 5.d4+ exd3 6.Re6+ Kf5 7.e4+ fxe3 8.Rf6+ Kg5 9.Rg6+ Kh5
 29/18	00:34	 732.637k	21.013k	-3,86	1.b4+ cxb3 2.Rgc6+ Kd5 3.c4+ dxc3 4.Rd6+ Ke5 5.d4+ exd3 6.Re6+ Kf5 7.e4+ fxe3 8.Rf6+ Kg5 9.Rg6+ Kh5
 30/18	00:50	 1.035.415k	20.564k	-3,86	1.b4+ cxb3 2.Rgc6+ Kd5 3.c4+ dxc3 4.Rd6+ Ke5 5.d4+ exd3 6.Re6+ Kf5 7.e4+ fxe3 8.Rf6+ Kg5 9.Rg6+ Kh5
 31/19-	02:27	 2.879.537k	19.474k	-3,99	1.b4+ cxb3
 31/37+	02:28	 2.882.825k	19.473k	-0,44	1.b4+
 31/37+	02:28	 2.882.842k	19.473k	 0,00	1.b4+
 31/37	02:28	 2.882.863k	19.473k	 0,00	1.b4+ cxb3 2.Rgc6+ Kd5 3.c4+ dxc3 4.Rd6+ Ke5 5.d4+ exd3 6.Re6+ Kf5 7.e4+ fxe3 8.Rf6+ Kg5 9.f4+ gxf3 10.Rg6+ Kh5 11.g4+ hxg3 12.Rg5+ Kxg5 13.Rg6+ Kf5 14.Rf6+ Kg5
 32/29+	02:28	 2.882.934k	19.473k	 0,00	1.b4+
 32/30	02:28	 2.882.946k	19.473k	 0,00	1.b4+ cxb3 2.Rgc6+ Kd5 3.c4+ dxc3 4.Rd6+ Ke5 5.d4+ exd3 6.Re6+ Kf5 7.e4+ fxe3 8.Rf6+ Kg5 9.f4+ gxf3 10.Rg6+ Kh5 11.g4+ hxg3 12.Rg5+ Kxg5 13.Rg6+ Kf4 14.Rf6+ Kg5
 33/30	02:30	 2.923.461k	19.456k	 0,00	1.b4+ cxb3 2.Rgc6+ Kd5 3.c4+ dxc3 4.Rd6+ Ke5 5.d4+ exd3 6.Re6+ Kf5 7.e4+ fxe3 8.Rf6+ Kg5 9.f4+ gxf3 10.Rg6+ Kh5 11.g4+ hxg3 12.Rg5+ Kxg5 13.Rg6+ Kf4 14.Rf6+ Kg5
 34/30	02:40	 3.119.247k	19.462k	 0,00	1.b4+ cxb3 2.Rgc6+ Kd5 3.c4+ dxc3 4.Rd6+ Ke5 5.d4+ exd3 6.Re6+ Kf5 7.e4+ fxe3 8.Rf6+ Kg5 9.f4+ gxf3 10.Rg6+ Kh5 11.g4+ hxg3 12.Rg5+ Kxg5 13.Rg6+ Kf4 14.Rf6+ Kg5
 35/16	03:13	 3.734.659k	19.318k	 0,00	1.b4+ cxb3 2.Rgc6+ Kd5 3.c4+ dxc3 4.Rd6+ Ke5 5.d4+ exd3 6.Re6+ Kf5 7.e4+ fxe3 8.Rf6+ Kg5
 36/16	03:13	 3.739.476k	19.318k	 0,00	1.b4+ cxb3 2.Rgc6+ Kd5 3.c4+ dxc3 4.Rd6+ Ke5 5.d4+ exd3 6.Re6+ Kf5 7.e4+ fxe3 8.Rf6+ Kg5
 37/16	03:13	 3.746.642k	19.319k	 0,00	1.b4+ cxb3 2.Rgc6+ Kd5 3.c4+ dxc3 4.Rd6+ Ke5 5.d4+ exd3 6.Re6+ Kf5 7.e4+ fxe3 8.Rf6+ Kg5
 38/16	03:14	 3.765.737k	19.321k	 0,00	1.b4+ cxb3 2.Rgc6+ Kd5 3.c4+ dxc3 4.Rd6+ Ke5 5.d4+ exd3 6.Re6+ Kf5 7.e4+ fxe3 8.Rf6+ Kg5

Code: Select all

SugaR AI ICCF 2.50 avx2:
NNUE evaluation using nn-13406b1dcbe0.nnue enabled
...
 17/43	00:13	 258.803k	18.630k	-5,20	1.Rgc6+ Kd5 2.Rd6+ Ke5 3.Re6+ Kf5 4.Rbc6 h3 5.Rf6+ Kg5 6.gxh3 gxh3 7.Rg6+ Kh5 8.Rg7 Rh6 9.Rc8 Rg6+ 10.Rxg6 Kxg6 11.Rg8+ Kf6 12.Rf8+ Ke6 13.Rxa8 h2+ 14.Kxh2 Rxf1 15.f3 Rf2+ 16.Kh3 exf3 17.exf3 Bc5 18.Ra4 Rxd2 19.Rxc4 Kd5 20.b3 Re2 21.Kg4 Bd6 22.Rc8
 18/46-	00:18	 340.953k	18.220k	-5,82	1.Rgc6+ Kd5
 18/54	00:20	 376.809k	18.160k	-5,90	1.Rgc6+ Kd5 2.Rd6+ Ke5 3.Re6+ Kf5 4.Rbc6 h3 5.Rf6+ Kg5 6.Rg6+ Kh5 7.gxh3 gxh3 8.Rg7 Rh6 9.Rc8 Rg6+ 10.Rxg6 Kxg6 11.Rg8+ Kf6 12.Rf8+ Ke6 13.Re8+ Kd6 14.Rxe4 h2+ 15.Kxh2 Rxf1 16.Rxf4 Nc7 17.Rf6+ Ne6 18.Kg2 Re1 19.f4 Ke7 20.Rh6 Rxe2+ 21.Kf3 d3
 19/36	00:25	 455.760k	17.849k	-6,20	1.Rgc6+ Kd5 2.Rd6+ Ke5 3.Re6+ Kf5 4.Rf6+ Kg5 5.Rg6+ Kh5 6.Ra6 Rxa6 7.Rxa6 Bb6 8.d3 exd3 9.exd3 c3 10.bxc3 dxc3 11.Nh2 Re8 12.Kf1 Kg5 13.Ra1 Nc7 14.Ra4 Kf5 15.Rb4 Bxf2 16.Kxf2
 20/54	00:29	 524.296k	17.674k	-6,25	1.Rgc6+ Kd5 2.Rd6+ Ke5 3.Re6+ Kf5 4.Rf6+ Kg5 5.Rg6+ Kh5 6.Rbc6 h3 7.gxh3 gxh3 8.Rg7 Rh6 9.Rc8 Rg6+ 10.Rxg6 Kxg6 11.Rxa8 d3 12.exd3 Bxf2+ 13.Kxf2 Rxa8 14.dxe4 Ra2 15.Kf3 Kg5 16.c3 Rxb2 17.Ke2 Ra2 18.Kf3 Rc2 19.Ke2 Rb2 20.Kf3 Rb1 21.Nh2 Rh1 22.Ng4 Rf1+ 23.Ke2
 21/51	01:15	 1.283.363k	16.904k	-6,37	1.Rgc6+ Kd5 2.Rd6+ Ke5 3.Ra6 Bb6 4.Rdxb6 Rxf1+ 5.Kxf1 Nxb6 6.Rxb6 Ra8 7.g3 Ra1+ 8.Kg2 f3+ 9.exf3 exf3+ 10.Kh2
 22/16	01:18	 1.321.895k	16.902k	-6,49	1.Rgc6+ Kd5 2.Rd6+ Ke5 3.Ra6 Bb6 4.Rdxb6 Rxf1+ 5.Kxf1 Nxb6 6.Rxb6 Ra8 7.g3 Ra1+ 8.Kg2 f3+ 9.exf3 exf3+ 10.Kh2
 23/23	01:18	 1.326.093k	16.903k	-6,41	1.Rgc6+ Kd5 2.Rd6+ Ke5 3.Re6+ Kf5 4.Rf6+ Kg5 5.Rg6+ Kh5 6.Rbc6 h3 7.gxh3 gxh3 8.Ra6 h2+ 9.Kxh2
 24/17	01:19	 1.336.836k	16.904k	-6,34	1.Rgc6+ Kd5 2.Rd6+ Ke5 3.Re6+ Kf5 4.Rf6+ Kg5 5.Rg6+ Kh5 6.Rbc6 h3 7.gxh3 gxh3 8.Ra6 h2+ 9.Kxh2
 25/17	01:38	 1.655.321k	16.778k	-6,46	1.Rgc6+ Kd5 2.Rd6+ Ke5 3.Re6+ Kf5 4.Rf6+ Kg5 5.Rg6+ Kh5 6.Rbc6 h3 7.gxh3 gxh3 8.Kh2 Rxf1 9.Kxh3
 26/17	01:47	 1.803.645k	16.763k	-6,55	1.Rgc6+ Kd5 2.Rd6+ Ke5 3.Re6+ Kf5 4.Rf6+ Kg5 5.Rg6+ Kh5 6.Rbe6 Nc7 7.Rc6 d3 8.cxd3 g3 9.e3
 27/18	01:59	 2.000.327k	16.713k	-6,48	1.Rgc6+ Kd5 2.Rd6+ Ke5 3.Re6+ Kf5 4.Rf6+ Kg5 5.Rg6+ Kh5 6.Rbe6 Nc7 7.Rc6 d3 8.Rgf6 g3 9.Rf5+ Kg4
 28/18	02:10	 2.171.438k	16.668k	-6,45	1.Rgc6+ Kd5 2.Rd6+ Ke5 3.Re6+ Kf5 4.Rf6+ Kg5 5.Rg6+ Kh5 6.Rbe6 Nc7 7.Rc6 d3 8.Rgf6 g3 9.Rf5+ Kg4
 29/18	03:10	 3.082.894k	16.222k	-6,45	1.Rgc6+ Kd5 2.Rd6+ Ke5 3.Re6+ Kf5 4.Rf6+ Kg5 5.Rg6+ Kh5 6.Rbe6 Nc7 7.Rc6 d3 8.Rgf6 g3 9.Rf5+ Kg4
 30/47	04:54	 4.637.825k	15.758k	-6,58	1.Rgc6+ Kd5 2.Rd6+ Ke5 3.Re6+ Kf5 4.Rf6+ Kg5 5.Rg6+ Kh5 6.Rbe6 Nc7 7.Rc6 g3 8.d3 exd3 9.exd3 c3
 31/41+	05:25	 5.112.129k	15.689k	-0,44	1.b4+
 31/42	05:29	 5.168.882k	15.679k	 0,00	1.b4+ cxb3 2.Rgc6+ Kd5 3.c4+ dxc3 4.Rd6+ Ke5 5.d4+ exd3 6.Re6+ Kf5 7.e4+ fxe3 8.Rf6+ Kg5 9.f4+ gxf3 10.Rg6+ Kh5 11.g4+ hxg3 12.Rg5+ Kxg5 13.Rg6+ Kf5 14.Rf6+ Ke5 15.Re6+ Kd5 16.Rd6+ Kc4 17.Rc6+ Kb5 18.Rb6+ Ka4 19.Rb4+ Ka5 20.Rb5+ Ka4
 32/29+	05:29	 5.168.981k	15.679k	-0,22	1.b4+
 32/29+	05:29	 5.169.023k	15.679k	-0,15	1.b4+
 32/29+	05:29	 5.169.050k	15.679k	 0,00	1.b4+
 32/29	05:32	 5.213.375k	15.673k	 0,00	1.b4+ cxb3 2.Rgc6+ Kd5 3.c4+ dxc3 4.Rd6+ Ke5 5.d4+ exd3 6.Re6+ Kf5 7.e4+ fxe3 8.Rf6+ Kg5 9.f4+ gxf3 10.Rg6+ Kh5 11.g4+ hxg3 12.Rg5+ Kh4 13.Rh6+ Kxg5 14.Rg6+ Kxg6
 33/29	05:43	 5.377.600k	15.651k	 0,00	1.b4+ cxb3 2.Rgc6+ Kd5 3.c4+ dxc3 4.Rd6+ Ke5 5.d4+ exd3 6.Re6+ Kf5 7.e4+ fxe3 8.Rf6+ Kg5 9.f4+ gxf3 10.Rg6+ Kh5 11.g4+ hxg3 12.Rg5+ Kh4 13.Rh6+ Kxg5 14.Rg6+ Kxg6
 34/29	06:17	 5.890.574k	15.618k	 0,00	1.b4+ cxb3 2.Rgc6+ Kd5 3.c4+ dxc3 4.Rd6+ Ke5 5.d4+ exd3 6.Re6+ Kf5 7.e4+ fxe3 8.Rf6+ Kg5 9.f4+ gxf3 10.Rg6+ Kh5 11.g4+ hxg3 12.Rg5+ Kh4 13.Rh6+ Kxg5 14.Rg6+ Kxg6
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fishpov
Posts: 112
Joined: Sat Mar 07, 2015 6:05 pm

Re: Which engines can crack n6r/b7/1R4R1/2k5/2pppppp/8/1PPPPPP1/r4NK1 w - - 0 1 ?

Post by fishpov »

[d]n6r/b7/1R4R1/2k5/2pppppp/8/1PPPPPP1/r4NK1 w - - 0 1

The last release of Obsidian
Analysis by Obsidian dev-15.14 JA:
......
1.Rgc6+ Kd5 2.Rd6+ Ke5 3.Re6+ Kf5 4.Rbc6 Bb8 5.Rf6+ Ke5 6.e3 h3 7.exf4+ Kd5 8.Kh2 Bxf4+ 9.Ng3 Be5 10.Rfe6 Nc7 11.Rxe5+ Kxc6 12.Rxe4 Rf8 13.Rxg4 Rxf2 14.Kxh3 Ne6 15.c3 Rxd2 16.Kh2 Rxb2 17.Rh4 dxc3 18.Rxc4+
Black is clearly winning: -+ (-5.99) Depth: 33 00:01:27 575MN
1.Rgc6+ Kd5 2.Rd6+ Ke5 3.Re6+ Kf5 4.Rbc6 Bb8 5.Rf6+ Ke5 6.Rce6+ Kd5 7.Ra6 Rxa6 8.Rxa6 Nc7 9.Ra5+ Kc6 10.Re5 g3 11.e3 Re8 12.Rh5 gxf2+ 13.Kxf2 fxe3+ 14.dxe3 d3 15.Ke1 Nb5 16.cxd3 exd3 17.Rxh4 Nd6
Black is clearly winning: -+ (-5.92) Depth: 34 00:01:28 584MN
1.Rgc6+ Kd5 2.Rd6+ Ke5 3.Re6+ Kf5 4.Rf6+ Kg5 5.Rg6+ Kh5 6.Rbf6 d3 7.cxd3 Bd4 8.Ra6 g3 9.Rxa1 Bxf2+ 10.Kh1 Kxg6 11.dxe4 Nc7 12.e3 fxe3 13.dxe3 Ra8 14.Rxa8 Nxa8 15.e5 Nc7 16.Nd2 Bxe3 17.Nxc4 Bc5 18.Nd2 Ne6 19.Nf3 Kh5 20.Nd2 Kg4 21.Nf3 Bb6 22.Nd2 Kf4
Black is clearly winning: -+ (-6.12) Depth: 35 00:02:50 1095MN
1.b4+ cxb3 2.Rgc6+ Kd5 3.c4+ dxc3 4.Rd6+ Ke5 5.d4+ exd3 6.Re6+ Kf5 7.e4+ fxe3 8.Rf6+ Kg5 9.f4+ gxf3 10.Rg6+ Kh5 11.g4+ hxg3 12.Rg5+ Kxg5 13.Rg6+ Kf4 14.Rf6+ Ke4 15.Re6+ Kd5 16.Re5+ Kc6 17.Rc5+ Kd7 18.Rc7+ Kd6 19.Rc6+ Kd5 20.Rd6+ Kc5 21.Rc6+ Kb4 22.Rb6+ Kc4 23.Rb4+ Kd5 24.Rd4+ Ke5 25.Rb4
Black is clearly winning: -+ (-6.11) Depth: 36 00:03:01 1167MN
1.b4+ cxb3 2.Rgc6+ Kd5 3.c4+ dxc3 4.Rd6+ Ke5 5.d4+ exd3 6.Re6+ Kf5 7.e4+ fxe3 8.Rf6+ Kg5 9.f4+ gxf3 10.Rg6+ Kh5 11.g4+ hxg3 12.Rg5+ Kxg5 13.Rg6+ Kf4 14.Rf6+ Ke5 15.Re6+ Kd4 16.Rd6+ Kc4 17.Rc6+ Kd5 18.Rd6+
The position is equal: = (0.00) Depth: 37 00:03:04 1187MN
1.b4+ cxb3 2.Rgc6+ Kd5 3.c4+ dxc3 4.Rd6+ Ke5 5.d4+ exd3 6.Re6+ Kf5 7.e4+ fxe3 8.Rf6+ Kg5 9.f4+ gxf3 10.Rg6+ Kh5 11.g4+ hxg3 12.Rg5+ Kxg5 13.Rg6+ Kf4 14.Rf6+ Ke5 15.Re6+ Kd4 16.Rd6+ Kc4 17.Rc6+ Kd5 18.Rd6+
The position is equal: = (0.00) Depth: 38 00:03:04 1187MN
1.b4+ cxb3 2.Rgc6+ Kd5 3.c4+ dxc3 4.Rd6+ Ke5 5.d4+ exd3 6.Re6+ Kf5 7.e4+ fxe3 8.Rf6+ Kg5 9.f4+ gxf3 10.Rg6+ Kh5 11.g4+ hxg3 12.Rg5+ Kxg5 13.Rg6+ Kf4 14.Rf6+ Ke5 15.Re6+ Kd4 16.Rd6+ Kc4 17.Rc6+ Kd5 18.Rd6+
The position is equal: = (0.00) Depth: 39 00:03:04 1187MN
.........
1.b4+ cxb3 2.Rgc6+ Kd5 3.c4+ dxc3 4.Rd6+ Ke5 5.d4+ exd3 6.Re6+ Kf5 7.e4+ fxe3 8.Rf6+ Kg5 9.f4+ gxf3 10.Rg6+ Kh5 11.g4+ hxg3 12.Rg5+ Kxg5 13.Rg6+ Kf4 14.Rf6+ Ke5 15.Re6+ Kd4 16.Rd6+ Kc4 17.Rc6+ Kd5 18.Rd6+
The position is equal: = (0.00) Depth: 110 00:10:41 3819MN
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