Pesky FEN of the Day

Discussion of anything and everything relating to chess playing software and machines.

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peter
Posts: 3410
Joined: Sat Feb 16, 2008 7:38 am
Full name: Peter Martan

Re: Pesky FEN of the Day

Post by peter »

MOBMAT wrote: ↑Wed Aug 12, 2020 4:30 pm Well, one responded said Cfish had a solution but there hasn't been another engine. I tried H6 (Nalimov) again but every time I do, something happens (power went out, windows decided to reboot, etc.). I haven't given up on trying to solve it, but as I said, my PC might not have the teeth (RAM, mostly).
Louis showed the #20 you asked for with Cfisch - output of his machine, you can't reproduce it with your own hardware and so you doubt the solution, even if you asked for it before?
:)
Of course such "problems" are a matter of hardware too to "solve" them.
If you want a "software- only" solution, try Chest or Gustav.

If it isn't for "solving" with empty hash started only, here's latest SF dev. after Backward of Louis' output- line:

[d]8/3n2kp/p3p1p1/4P1P1/4Nr2/PK6/2B5/8 b - - 0 1

Analysis by Stockfish 110820:

1...Rxe4 2.Bd1 Nc5+ 3.Kc3 Rxe5 4.Kb4 Rxg5 5.Bf3 h5 6.Be2 Kf6 7.Bf1 Rf5 8.Bh3 g5 9.Bxf5 exf5 10.Kxc5 h4 11.Kd5 h3 12.Kd4 h2 13.Ke3 h1Q 14.Ke2 g4 15.Kd3 Qf3+ 16.Kd2 g3 17.a4 g2 18.Kc2 g1Q 19.Kb2 Qgf2+ 20.Kc1 Qh1#
-+ (-#20) Depth: 71/40 00:00:18 575MN
Last edited by peter on Wed Aug 12, 2020 5:43 pm, edited 1 time in total.
Peter.
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MOBMAT
Posts: 396
Joined: Sat Feb 04, 2017 11:57 pm
Location: USA

Re: Pesky FEN of the Day

Post by MOBMAT »

Dicaste wrote: ↑Wed Aug 12, 2020 4:47 pm

Code: Select all

New game Line
4r3/2k1p2q/pp1nR1p1/2pP1pP1/2P2P2/1P6/P1K3B1/4Q3 w - - 0 1

Analysis by Stockfish 100820 DarkHorse:

1.Rxd6 Kxd6 2.Qe6+ Kc7 3.Qc6+ Kd8 4.Qxb6+ Kd7 5.Qa7+ Kd8 6.d6 
  White is clearly better: +- (2.20)  Depth: 10/22   00:00:00
1.Rxd6 exd6 2.Qxe8 Kb7 3.Qc6+ Ka7 4.Qxd6 Qb7 5.Kd3 a5 6.Qc6 
  White is clearly better: +- (2.47)  Depth: 11/22   00:00:00
1.Rxd6 exd6 2.Qxe8 Qd7 3.Qxg6 b5 4.Qe6 b4 5.Qxd7+ Kxd7 6.Bf1 a5 7.Bh3 Kc8 8.Bxf5+ Kd8 9.g6 
  White is clearly better: +- (2.34)  Depth: 12/22   00:00:00
1.Rxd6 exd6 2.Qxe8 Qd7 3.Qxg6 b5 4.Bh3 b4 5.Bxf5 Qd8 6.Qf7+ Kb8 7.g6 Qa5 8.g7 
  White has a decisive advantage: +- (2.51)  Depth: 13/22   00:00:00  247kN
1.Rxd6 exd6 2.Qxe8 Qd7 3.Qxg6 b5 4.Bh3 b4 5.Bxf5 Qe7 6.Qe6 Qf8 7.Kd2 a5 8.Qd7+ Kb8 9.Qb5+ Ka7 10.Qxa5+ Kb7 
  White has a decisive advantage: +- (2.55)  Depth: 14/24   00:00:00  464kN
1.Rxd6 exd6 2.Qxe8 Qd7 3.Qxg6 Qe7 4.Qe6 Qh7 5.Qe8 Qd7 6.Qa8 b5 7.Qc6+ Kd8 8.Qxd7+ Kxd7 9.cxb5 axb5 10.Bh3 b4 11.Bxf5+ Kd8 12.Kd3 
  White has a decisive advantage: +- (2.60)  Depth: 15/26   00:00:00  966kN
1.Rxd6 exd6 2.Qxe8 Qd7 3.Qxg6 Kb7 4.Qe6 Qd8 5.Qxf5 b5 6.cxb5 axb5 7.Qf6 Qd7 8.Bf1 b4 9.f5 Qh7 10.g6 Qd7 
  White has a decisive advantage: +- (2.55)  Depth: 16/30   00:00:00  1307kN
1.Rxd6 exd6 2.Qxe8 Qd7 3.Qxg6 Qe7 4.Qe6 Qh7 5.Qe8 Qd7 6.Qa8 Qe7 7.Qc6+ Kd8 8.Bf3 a5 9.Qa8+ Kc7 10.Kd2 Qd8 11.Qc6+ Kb8 
  White has a decisive advantage: +- (2.62)  Depth: 17/31   00:00:00  1576kN, tb=2
1.Rxd6 exd6 2.Qxe8 Qd7 3.Qxg6 Qe7 4.Qe6 Qh7 5.Qe8 Qd7 6.Qa8 a5 7.Qc6+ Kd8 8.Bh3 Ke7 9.Qxd7+ Kxd7 10.Bxf5+ Ke8 11.Bd3 Ke7 12.Kd1 Kd8 13.f5 Ke7 
  White has a decisive advantage: +- (2.66)  Depth: 18/39   00:00:00  2150kN, tb=2
1.Rxd6 exd6 2.Qxe8 Qd7 3.Qxg6 Qe7 4.Qe6 Qh7 5.Qe8 Qh4 6.Qc6+ Kd8 7.Qxd6+ Ke8 8.Qe6+ Kd8 9.Qxb6+ Kd7 10.Qe6+ Kd8 11.Qd6+ Ke8 12.Qe5+ Kd8 13.Qxf5 Qf2+ 14.Kd3 Qg3+ 15.Ke4 Qxg2+ 16.Ke5 Qf3 17.d6 
  White has a decisive advantage: +- (2.69)  Depth: 19/39   00:00:00  3252kN, tb=2
1.Rxd6 exd6 2.Qxe8 Qd7 3.Qxg6 Qe7 4.Qe6 Qh7 5.Qe8 Qd7 6.Qa8 Qe7 7.Qc6+ Kd8 8.Bf3 a5 9.Kd2 Qc7 10.Qxc7+ Kxc7 11.g6 b5 12.g7 a4 13.bxa4 b4 14.g8Q Kd7 15.Qf7+ Kd8 16.Qxf5 
  White has a decisive advantage: +- (2.84)  Depth: 20/39   00:00:00  5804kN, tb=4
1.Rxd6 exd6 2.Qxe8 Qd7 3.Qxg6 Qe7 4.Qe6 Qg7 5.Qe8 Qd7 6.Qa8 Qe7 7.Qc6+ Kd8 8.Bf3 a5 9.Kd2 Qc7 10.Qxc7+ Kxc7 11.g6 b5 12.g7 a4 13.g8Q b4 14.Qf7+ Kd8 15.bxa4 Kc8 16.Qe8+ Kb7 17.Qc6+ Ka7 18.Qxd6 
  White has a decisive advantage: +- (2.91)  Depth: 21/39   00:00:01  8937kN, tb=10
1.Rxd6 exd6 2.Qxe8 Qd7 3.Qxg6 Qe7 4.Qe6 Qh7 5.Qe8 Qd7 6.Qa8 Qe7 7.Qc6+ Kd8 8.Bf3 a5 9.Kd2 Qc7 10.Qxc7+ Kxc7 11.g6 Kb8 12.g7 Kb7 13.g8Q Kc7 14.Qe6 a4 15.Qe7+ Kb8 
  White has a decisive advantage: +- (3.04)  Depth: 22/39   00:00:02  15255kN, tb=17
1.Rxd6 exd6 2.Qxe8 Qd7 3.Qxg6 Qe7 4.Qe6 Qh7 5.Qe8 Qd7 6.Qa8 Qe7 7.Qc6+ Kd8 8.Bf3 a5 9.Kd2 b5 10.cxb5 Qc7 11.b6 Qb8 12.Bh5 Ke7 13.b7 Kf8 14.Qc8+ Qxc8 15.bxc8Q+ Kg7 16.Qxf5 
  White has a decisive advantage: +- (3.12)  Depth: 23/46   00:00:02  19709kN, tb=31
1.Rxd6 exd6 2.Qxe8 Qd7 3.Qxg6 Qe7 4.Qe6 Qh7 5.Qe8 Qd7 6.Qa8 Qe7 7.Qc6+ Kd8 8.Bf3 a5 9.Kd2 b5 10.cxb5 Qc7 11.b6 Qb8 12.Bh5 Ke7 13.b7 Kf8 14.Qc8+ Qxc8 15.bxc8Q+ Kg7 16.Qxf5 
  White has a decisive advantage: +- (3.20 ++)  Depth: 24/46   00:00:03  27005kN, tb=62
1.Rxd6 exd6 2.Qxe8 Qd7 3.Qxg6 Qe7 4.Qe6 Qh7 5.Qe8 Qd7 6.Qa8 Qe7 7.Qc6+ Kd8 8.Bf3 a5 9.Kd2 b5 10.cxb5 Qc7 11.b6 Qb8 12.Bh5 Ke7 13.b7 Kf8 14.Qc8+ Qxc8 15.bxc8Q+ Kg7 16.Qxf5 
  White has a decisive advantage: +- (3.28 ++)  Depth: 24/46   00:00:04  33291kN, tb=91
1.Rxd6 exd6 2.Qxe8 Qd7 3.Qxg6 Qe7 4.Qe6 Qh7 5.Qe8 Qd7 6.Qa8 Qe7 7.Qc6+ Kb8 8.Qxb6+ Kc8 9.Qxa6+ Kb8 10.Kd3 Qd8 11.Bh3 Qe7 12.Qb6+ Ka8 13.Qc6+ Kb8 14.Bxf5 Qd8 15.Qa6 Qe7 16.Qc8+ Ka7 17.Qd7+ Qxd7 
  White has a decisive advantage: +- (3.31)  Depth: 24/46   00:00:04  38126kN, tb=126
1.Rxd6 exd6 2.Qxe8 Qd7 3.Qxg6 Qe7 4.Qe6 Qh7 5.Qe8 Qd7 6.Qa8 Qe7 7.Qc6+ Kb8 8.Qxb6+ Kc8 9.Qxa6+ Kb8 10.Kd3 Qd8 11.Bh3 Qe7 12.Qb6+ Ka8 13.Qc6+ Kb8 14.Bxf5 Qd8 15.Qa6 Qe7 16.Qc8+ Ka7 17.Qd7+ Qxd7 
  White has a decisive advantage: +- (3.39 ++)  Depth: 25/40   00:00:05  50596kN, tb=232
1.Rxd6 exd6 2.Qxe8 Qd7 3.Qxg6 Qe7 4.Qe6 Qg7 5.Qe8 Qd7 6.Qa8 Qe7 7.Qc6+ Kb8 8.Qxb6+ Kc8 9.Qxa6+ Kb8 10.Kd3 Qd8 11.Bh3 Qf8 12.Qb5+ Ka8 13.Qa4+ Kb8 14.Qa6 Qh8 15.Qxd6+ Kb7 16.Qc6+ Kb8 17.Bxf5 Qd4+ 18.Ke2 Qb2+ 19.Kf3 Qd4 20.Qd6+ Ka8 
  White has a decisive advantage: +- (3.46)  Depth: 25/42   00:00:07  64500kN, tb=283

(,  12.08.2020)
It finds instantly.
The first few moves are easy, the idea is to actually find the mate in 24.
i7-6700K @ 4.00Ghz 32Gb, Win 10 Home, EGTBs on PCI SSD
Benchmark: Stockfish15.1 NNUE x64 bmi2 (nps): 1277K
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peter
Posts: 3410
Joined: Sat Feb 16, 2008 7:38 am
Full name: Peter Martan

Re: Pesky FEN of the Day

Post by peter »

MOBMAT wrote: ↑Wed Aug 12, 2020 5:43 pm
Dicaste wrote: ↑Wed Aug 12, 2020 4:47 pm

Code: Select all

New game Line
4r3/2k1p2q/pp1nR1p1/2pP1pP1/2P2P2/1P6/P1K3B1/4Q3 w - - 0 1

Analysis by Stockfish 100820 DarkHorse:

1.Rxd6 Kxd6 2.Qe6+ Kc7 3.Qc6+ Kd8 4.Qxb6+ Kd7 5.Qa7+ Kd8 6.d6 
  White is clearly better: +- (2.20)  Depth: 10/22   00:00:00
1.Rxd6 exd6 2.Qxe8 Kb7 3.Qc6+ Ka7 4.Qxd6 Qb7 5.Kd3 a5 6.Qc6 
  White is clearly better: +- (2.47)  Depth: 11/22   00:00:00
1.Rxd6 exd6 2.Qxe8 Qd7 3.Qxg6 b5 4.Qe6 b4 5.Qxd7+ Kxd7 6.Bf1 a5 7.Bh3 Kc8 8.Bxf5+ Kd8 9.g6 
  White is clearly better: +- (2.34)  Depth: 12/22   00:00:00
1.Rxd6 exd6 2.Qxe8 Qd7 3.Qxg6 b5 4.Bh3 b4 5.Bxf5 Qd8 6.Qf7+ Kb8 7.g6 Qa5 8.g7 
  White has a decisive advantage: +- (2.51)  Depth: 13/22   00:00:00  247kN
1.Rxd6 exd6 2.Qxe8 Qd7 3.Qxg6 b5 4.Bh3 b4 5.Bxf5 Qe7 6.Qe6 Qf8 7.Kd2 a5 8.Qd7+ Kb8 9.Qb5+ Ka7 10.Qxa5+ Kb7 
  White has a decisive advantage: +- (2.55)  Depth: 14/24   00:00:00  464kN
1.Rxd6 exd6 2.Qxe8 Qd7 3.Qxg6 Qe7 4.Qe6 Qh7 5.Qe8 Qd7 6.Qa8 b5 7.Qc6+ Kd8 8.Qxd7+ Kxd7 9.cxb5 axb5 10.Bh3 b4 11.Bxf5+ Kd8 12.Kd3 
  White has a decisive advantage: +- (2.60)  Depth: 15/26   00:00:00  966kN
1.Rxd6 exd6 2.Qxe8 Qd7 3.Qxg6 Kb7 4.Qe6 Qd8 5.Qxf5 b5 6.cxb5 axb5 7.Qf6 Qd7 8.Bf1 b4 9.f5 Qh7 10.g6 Qd7 
  White has a decisive advantage: +- (2.55)  Depth: 16/30   00:00:00  1307kN
1.Rxd6 exd6 2.Qxe8 Qd7 3.Qxg6 Qe7 4.Qe6 Qh7 5.Qe8 Qd7 6.Qa8 Qe7 7.Qc6+ Kd8 8.Bf3 a5 9.Qa8+ Kc7 10.Kd2 Qd8 11.Qc6+ Kb8 
  White has a decisive advantage: +- (2.62)  Depth: 17/31   00:00:00  1576kN, tb=2
1.Rxd6 exd6 2.Qxe8 Qd7 3.Qxg6 Qe7 4.Qe6 Qh7 5.Qe8 Qd7 6.Qa8 a5 7.Qc6+ Kd8 8.Bh3 Ke7 9.Qxd7+ Kxd7 10.Bxf5+ Ke8 11.Bd3 Ke7 12.Kd1 Kd8 13.f5 Ke7 
  White has a decisive advantage: +- (2.66)  Depth: 18/39   00:00:00  2150kN, tb=2
1.Rxd6 exd6 2.Qxe8 Qd7 3.Qxg6 Qe7 4.Qe6 Qh7 5.Qe8 Qh4 6.Qc6+ Kd8 7.Qxd6+ Ke8 8.Qe6+ Kd8 9.Qxb6+ Kd7 10.Qe6+ Kd8 11.Qd6+ Ke8 12.Qe5+ Kd8 13.Qxf5 Qf2+ 14.Kd3 Qg3+ 15.Ke4 Qxg2+ 16.Ke5 Qf3 17.d6 
  White has a decisive advantage: +- (2.69)  Depth: 19/39   00:00:00  3252kN, tb=2
1.Rxd6 exd6 2.Qxe8 Qd7 3.Qxg6 Qe7 4.Qe6 Qh7 5.Qe8 Qd7 6.Qa8 Qe7 7.Qc6+ Kd8 8.Bf3 a5 9.Kd2 Qc7 10.Qxc7+ Kxc7 11.g6 b5 12.g7 a4 13.bxa4 b4 14.g8Q Kd7 15.Qf7+ Kd8 16.Qxf5 
  White has a decisive advantage: +- (2.84)  Depth: 20/39   00:00:00  5804kN, tb=4
1.Rxd6 exd6 2.Qxe8 Qd7 3.Qxg6 Qe7 4.Qe6 Qg7 5.Qe8 Qd7 6.Qa8 Qe7 7.Qc6+ Kd8 8.Bf3 a5 9.Kd2 Qc7 10.Qxc7+ Kxc7 11.g6 b5 12.g7 a4 13.g8Q b4 14.Qf7+ Kd8 15.bxa4 Kc8 16.Qe8+ Kb7 17.Qc6+ Ka7 18.Qxd6 
  White has a decisive advantage: +- (2.91)  Depth: 21/39   00:00:01  8937kN, tb=10
1.Rxd6 exd6 2.Qxe8 Qd7 3.Qxg6 Qe7 4.Qe6 Qh7 5.Qe8 Qd7 6.Qa8 Qe7 7.Qc6+ Kd8 8.Bf3 a5 9.Kd2 Qc7 10.Qxc7+ Kxc7 11.g6 Kb8 12.g7 Kb7 13.g8Q Kc7 14.Qe6 a4 15.Qe7+ Kb8 
  White has a decisive advantage: +- (3.04)  Depth: 22/39   00:00:02  15255kN, tb=17
1.Rxd6 exd6 2.Qxe8 Qd7 3.Qxg6 Qe7 4.Qe6 Qh7 5.Qe8 Qd7 6.Qa8 Qe7 7.Qc6+ Kd8 8.Bf3 a5 9.Kd2 b5 10.cxb5 Qc7 11.b6 Qb8 12.Bh5 Ke7 13.b7 Kf8 14.Qc8+ Qxc8 15.bxc8Q+ Kg7 16.Qxf5 
  White has a decisive advantage: +- (3.12)  Depth: 23/46   00:00:02  19709kN, tb=31
1.Rxd6 exd6 2.Qxe8 Qd7 3.Qxg6 Qe7 4.Qe6 Qh7 5.Qe8 Qd7 6.Qa8 Qe7 7.Qc6+ Kd8 8.Bf3 a5 9.Kd2 b5 10.cxb5 Qc7 11.b6 Qb8 12.Bh5 Ke7 13.b7 Kf8 14.Qc8+ Qxc8 15.bxc8Q+ Kg7 16.Qxf5 
  White has a decisive advantage: +- (3.20 ++)  Depth: 24/46   00:00:03  27005kN, tb=62
1.Rxd6 exd6 2.Qxe8 Qd7 3.Qxg6 Qe7 4.Qe6 Qh7 5.Qe8 Qd7 6.Qa8 Qe7 7.Qc6+ Kd8 8.Bf3 a5 9.Kd2 b5 10.cxb5 Qc7 11.b6 Qb8 12.Bh5 Ke7 13.b7 Kf8 14.Qc8+ Qxc8 15.bxc8Q+ Kg7 16.Qxf5 
  White has a decisive advantage: +- (3.28 ++)  Depth: 24/46   00:00:04  33291kN, tb=91
1.Rxd6 exd6 2.Qxe8 Qd7 3.Qxg6 Qe7 4.Qe6 Qh7 5.Qe8 Qd7 6.Qa8 Qe7 7.Qc6+ Kb8 8.Qxb6+ Kc8 9.Qxa6+ Kb8 10.Kd3 Qd8 11.Bh3 Qe7 12.Qb6+ Ka8 13.Qc6+ Kb8 14.Bxf5 Qd8 15.Qa6 Qe7 16.Qc8+ Ka7 17.Qd7+ Qxd7 
  White has a decisive advantage: +- (3.31)  Depth: 24/46   00:00:04  38126kN, tb=126
1.Rxd6 exd6 2.Qxe8 Qd7 3.Qxg6 Qe7 4.Qe6 Qh7 5.Qe8 Qd7 6.Qa8 Qe7 7.Qc6+ Kb8 8.Qxb6+ Kc8 9.Qxa6+ Kb8 10.Kd3 Qd8 11.Bh3 Qe7 12.Qb6+ Ka8 13.Qc6+ Kb8 14.Bxf5 Qd8 15.Qa6 Qe7 16.Qc8+ Ka7 17.Qd7+ Qxd7 
  White has a decisive advantage: +- (3.39 ++)  Depth: 25/40   00:00:05  50596kN, tb=232
1.Rxd6 exd6 2.Qxe8 Qd7 3.Qxg6 Qe7 4.Qe6 Qg7 5.Qe8 Qd7 6.Qa8 Qe7 7.Qc6+ Kb8 8.Qxb6+ Kc8 9.Qxa6+ Kb8 10.Kd3 Qd8 11.Bh3 Qf8 12.Qb5+ Ka8 13.Qa4+ Kb8 14.Qa6 Qh8 15.Qxd6+ Kb7 16.Qc6+ Kb8 17.Bxf5 Qd4+ 18.Ke2 Qb2+ 19.Kf3 Qd4 20.Qd6+ Ka8 
  White has a decisive advantage: +- (3.46)  Depth: 25/42   00:00:07  64500kN, tb=283

(,  12.08.2020)
It finds instantly.
The first few moves are easy, the idea is to actually find the mate in 24.
http://talkchess.com/forum3/viewtopic.p ... 47#p855747

http://talkchess.com/forum3/viewtopic.p ... 65#p855765
Peter.
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