An apparent fortress, but there is a move that looks like it wins.

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acase
Posts: 983
Joined: Wed Mar 15, 2006 1:14 am
Location: Columbus, Ohio USA
Full name: Andrew R Case

An apparent fortress, but there is a move that looks like it wins.

Post by acase »

Here is the position, admittedly I borrowed and modified the end position from Walter Eigenmann's ERET 075:

[d]3r4/3r4/2p1k3/p1pbPp1p/Pp1p1PpP/1P1P2R1/2P4R/2K1Q3 w - - 0 6

The correct move that looks like it "breaks through" is 1.Rxg4!

I currently have Stockfish looking at the position after Rxg4! and here is what I have so far:

Code: Select all

(Analyse)
3r4/3r4/2p1k3/p1pbPp1p/Pp1p1PRP/1P1P4/2P4R/2K1Q3 b - - 0 1

Analysis by Stockfish 180419 64 BMI2:

6...hxg4 7.h5 Re7 8.h6 Rh8 9.Rh5 Kd7 10.Qh4 Reh7 11.Rg5 Bxb3 
  +- (8.40)  Depth: 13/19   00:00:00  135kN
6...hxg4 7.h5 Re7 8.h6 Rh8 9.Rh5 Kd7 10.Qh4 Reh7 11.Rg5 Bf7 12.Rxf5 Bxb3 13.Rg5 Be6 14.f5 Kc7 15.fxe6 b3 
  +- (8.85)  Depth: 14/23   00:00:00  188kN
6...hxg4 7.h5 Re7 8.h6 Rh8 9.Rh5 Kd7 10.Qh4 Reh7 11.Rg5 Bf7 12.Rxf5 Bxb3 13.cxb3 
  +- (8.60)  Depth: 15/23   00:00:00  197kN
6...hxg4 7.h5 Re7 8.h6 Kd7 9.Rh5 Rh8 10.Qh4 Reh7 11.Rg5 Bf7 12.Rxf5 Bxb3 13.cxb3 Rxh6 14.Rf7+ Kc8 15.Qxg4+ Kb8 16.Kd1 
  +- (8.69)  Depth: 16/32   00:00:00  255kN
6...hxg4 7.h5 Re7 8.h6 Rh8 9.Rh5 Kd7 10.Qh4 Reh7 11.Rg5 Kc7 12.Rg6 Kb6 13.Qg5 Bf7 14.Rg7 c4 15.bxc4 g3 16.c5+ Ka6 17.Qxf5 
  +- (8.69)  Depth: 17/32   00:00:00  273kN
6...hxg4 7.h5 Re7 8.h6 Rh8 9.Rh5 Kd7 10.Qh4 Reh7 11.Rg5 Kc7 12.Rg6 Kb6 13.Qg5 Bf7 14.Rg7 c4 15.bxc4 g3 16.Kb2 b3 17.Qxf5 
  +- (8.75)  Depth: 18/32   00:00:00  299kN
6...hxg4 7.h5 Re7 8.h6 Rh8 9.Rh5 Kd7 10.Qh4 g3 11.Qxg3 Bf7 12.Rh2 Rh7 13.Qg5 Re6 14.Qxf5 Bg6 15.Qg4 Rf7 16.Kb2 Bh7 17.Rh5 c4 
  +- (8.88)  Depth: 19/32   00:00:00  1152kN
6...hxg4 7.h5 Re7 8.h6 Kd7 9.Rh5 Rh8 10.Qh4 Rf7 11.Rg5 Kc7 12.Rg6 Rfh7 13.Kb2 Kb6 14.Qg5 Bf7 
  +- (8.30)  Depth: 20/35   00:00:00  4658kN
6...hxg4 7.h5 Re7 8.h6 Kd7 9.Rh5 Rh8 10.Qh4 Rf7 11.Rg5 Kc7 12.Rg6 Kb6 13.Qg5 Rfh7 14.Rg7 g3 15.Rxh7 Rxh7 16.Qxg3 Rxh6 17.Kb2 Rh5 18.Qg6 Rh2 19.Qd6 Rf2 20.Qb8+ Ka6 21.Qe8 Kb6 22.e6 
  +- (8.40)  Depth: 21/35   00:00:00  4833kN
6...hxg4 7.h5 Rh8 8.Qh4 Rf7 9.h6 Kd7 10.Qg5 Kc7 11.Re2 Be6 12.Qg6 Re7 13.Rh2 Kb7 14.Kb2 Kb6 15.h7 Bd7 16.Qg5 Rf7 17.Rh6 c4 18.e6 
  +- (7.98)  Depth: 22/45   00:00:00  10321kN
6...hxg4 7.h5 Rh8 8.Qh4 Rf7 9.h6 Kd7 10.Qg5 Kc7 11.Re2 Be6 12.Qg6 Re7 13.Rh2 Kb6 14.Kb2 Bd5 15.h7 Rb7 16.Rh5 Bf3 17.e6 g3 18.Rxf5 g2 19.Rf7 Rxh7 20.Qxh7 Rxf7 21.exf7 
  +- (8.50)  Depth: 23/45   00:00:01  22499kN
6...hxg4 7.h5 Rh8 8.Qh4 Rf7 9.h6 Kd7 10.Qg5 Kc7 11.Re2 Be6 12.Qg6 Re7 13.Rh2 Rhh7 14.Kb2 Kc8 15.Rh5 Kb7 16.Qf6 Bd5 17.Rg5 Ref7 18.Qd6 Rd7 19.Qxc5 Rxh6 20.Qxa5 
  +- (8.36)  Depth: 24/45   00:00:01  26795kN
6...hxg4 7.h5 Rh8 8.Qh4 Rf7 9.h6 Kd7 10.Qg5 Kc7 11.Re2 Be6 12.Qg6 Re7 13.Rh2 Rhh7 14.Kb2 Kc8 15.Rh5 Kb7 16.Rg5 Rhf7 17.Qg8 Bd5 18.Qd8 Rh7 19.Rg6 Rc7 20.Qg5 g3 21.Qxg3 Bf7 22.Rd6 Re7 23.Kc1 Kb6 24.Qg5 Be6 25.Kb2 c4 26.dxc4 d3 27.Rxd3 
  +- (8.88)  Depth: 25/45   00:00:01  27832kN
6...hxg4 7.h5 Rh8 8.Qh4 Rf7 9.h6 Kd7 10.Qg5 Kc7 11.Re2 Be6 12.Qg6 Re7 13.Rh2 Kb6 14.Kb2 Bd5 15.h7 Rb7 16.Rh5 Bf3 17.e6 g3 18.Rxf5 Rbxh7 19.Qxg3 Bd5 20.Re5 Re7 21.f5 Rd8 22.Qf4 Kb7 23.f6 Rxe6 24.Rxe6 Bxe6 25.Qe5 Re8 26.Qxc5 Bf7 
  +- (8.88)  Depth: 26/45   00:00:01  34856kN
6...hxg4 7.h5 Rh8 8.Qh4 Rf7 9.h6 Kd7 10.Qg5 Kc7 11.Re2 Be6 12.Qg6 Re7 13.Rh2 Kb6 14.Kb2 Bd5 15.h7 Rb7 16.Rh5 Bf3 17.e6 g3 18.Rxf5 Rbxh7 19.Qxg3 Bd5 20.Re5 Re7 21.f5 Rd8 22.Qf4 Kb7 23.f6 Rxe6 24.Rxe6 Bxe6 25.Qe5 Re8 26.Qxc5 Bf7 
  +- (8.88)  Depth: 27/45   00:00:01  36025kN
6...hxg4 7.h5 Rh8 8.Qh4 Rf7 9.h6 Kd7 10.Qg5 Kc7 11.Re2 Be6 12.Qg6 Re7 13.Rh2 Kb6 14.Kb2 Bd5 15.h7 Rb7 16.Rh5 Bf3 17.e6 g3 18.Rxf5 Rbxh7 19.Qxg3 Bd5 20.Re5 Re7 21.f5 Rd8 22.Qf4 Kb7 23.f6 Rxe6 24.Rxe6 Bxe6 25.Qe5 Re8 26.Qxc5 Bf7 
  +- (8.88)  Depth: 28/45   00:00:01  36588kN
6...hxg4 7.h5 Rh8 8.Qh4 Rf7 9.h6 Kd7 10.Qg5 Kc7 11.Re2 Be6 12.Qg6 Re7 13.Rh2 Kb6 14.Kb2 Bd5 15.h7 Rb7 16.Rh5 Bf3 17.e6 g3 18.Rxf5 Rbxh7 19.Qxg3 Bd5 20.Re5 Re7 21.f5 Rd8 22.Qf4 Kb7 23.Qg5 Rde8 24.f6 Rxe6 25.Rxe6 Bxe6 26.Qxc5 Bf7 27.Qxa5 Bg6 
  +- (8.88)  Depth: 29/45   00:00:01  37250kN
6...hxg4 7.h5 Rh8 8.Qh4 Rf7 9.h6 Kd7 10.Qg5 Kc7 11.Re2 Be6 12.Qg6 Re7 13.Rh2 Kb6 14.Kb2 Bd5 15.h7 Ra7 16.Rh5 Re7 17.Rh6 g3 18.Qxg3 Rhxh7 19.Rxh7 Rxh7 20.Qg5 Rh2 21.Qd8+ Ka6 22.Qd7 Kb6 23.e6 Re2 24.e7 Bf7 25.Qd8+ Kb7 26.Qxa5 Rxe7 
  +- (8.86)  Depth: 30/55   00:00:01  43506kN
6...hxg4 7.h5 Rh8 8.Qh4 Rf7 9.h6 Kd7 10.Qg5 Kc7 11.Re2 Be6 12.Qg6 Re7 13.Rh2 Kb6 14.Kb2 Bd5 15.h7 Ra7 16.Rh5 Re7 17.Rh6 Be6 18.Qf6 Ree8 19.Qg7 Bd5 20.Rh5 Be6 21.Rh2 Bd5 22.Rh6 Ra8 23.Kc1 g3 24.Qxg3 Ra7 25.e6 Rhxh7 26.Rxh7 Rxh7 27.Qg8 Rh1+ 28.Kb2 Re1 
  +- (8.95)  Depth: 31/51   00:00:03  132MN
6...hxg4 7.h5 Rh8 8.Qh4 Rf7 9.h6 Kd7 10.Qg5 Kc7 11.Re2 Be6 12.Qg6 Re7 13.Rh2 Kb7 14.Kb2 Rhh7 15.Rh5 Ka6 16.Rg5 Kb6 17.Qf6 Re8 18.Rg7 Rhh8 19.h7 Rhf8 20.Qh4 Bd5 21.Kc1 Rh8 22.Qf6 Be6 23.Re7 Rxe7 24.Qxh8 Kb7 25.Qf6 Rxh7 26.Qxe6 g3 27.Qg6 Rh1+ 28.Kb2 c4 
  +- (8.95)  Depth: 32/53   00:00:05  198MN
6...hxg4 7.h5 Rh8 8.Qh4 Rf7 9.h6 Kd7 10.Qg5 Kc7 11.Re2 Re8 12.e6 Bxe6 13.Qg6 Rfe7 14.h7 Kd6 15.Rxe6+ Rxe6 16.Qg8 g3 17.h8Q Rxg8 18.Qxg8 Re3 19.Qd8+ Ke6 20.Qc8+ Kf6 21.Qf8+ Kg6 22.Qg8+ Kf6 23.Qg5+ Ke6 24.Qg6+ Kd7 25.Qxf5+ Kc7 26.Qg4 Re1+ 27.Kb2 Rg1 28.f5 g2 29.f6 Kb6 30.Qg6 Rf1 31.Qxg2 Rxf6 32.Qg8 
  +- (8.96)  Depth: 33/55   00:00:12  434MN
6...hxg4 7.h5 Rg7 8.Qh4 Kd7 9.h6 Rh7 10.Qg5 Be6 11.Qf6 Rg8 12.Rh5 g3 13.Rg5 Rf7 14.h7 Rxf6 15.hxg8Q Bxg8 16.exf6 Bf7 17.Rxg3 Ke6 18.Rh3 Kxf6 19.Rh6+ Bg6 20.Rh8 Ke7 21.Ra8 Kd7 22.Rxa5 Kd6 23.Ra7 Be8 24.a5 Bd7 25.a6 Bc8 26.Ra8 Kd7 27.a7 Bb7 28.Rf8 Kc7 29.a8Q Bxa8 30.Rxa8 c4 31.bxc4 Kd6 32.Ra7 b3 
  +- (8.96)  Depth: 34/59   00:00:18  670MN
6...hxg4 7.h5 Rh7 8.Qh4 Kd7 9.Qf6 Be6 10.h6 Rg8 11.Rh5 g3 12.Rg5 Rf7 13.h7 Rxf6 14.hxg8Q Bxg8 15.exf6 Bf7 16.Rxg3 Ke6 17.Rh3 Kxf6 18.Rh6+ Bg6 19.Rh8 Ke7 20.Ra8 Kd7 21.Rxa5 Kd6 22.Ra7 Be8 23.a5 Bd7 24.a6 Bc8 25.Ra8 Kd7 26.a7 Bb7 27.Rf8 Kc7 28.a8Q Bxa8 29.Rxa8 c4 30.bxc4 Kd6 31.Ra7 Ke6 32.Rg7 Kd6 33.Rg6+ Kc7 34.Rf6 Kd7 35.Kb2 b3 36.Kxb3 c5 
  +- (8.96)  Depth: 35/61   00:00:19  689MN
6...hxg4 7.h5 Rh7 8.Qh4 Kd7 9.Qf6 Be6 10.h6 Rg8 11.Rh5 g3 12.Rg5 Rf7 13.h7 Rxf6 14.hxg8Q Bxg8 15.exf6 Bf7 16.Rxg3 Ke6 17.Rh3 Kxf6 18.Rh6+ Bg6 19.Rh8 Ke7 20.Ra8 Kd7 21.Rxa5 Kd6 22.Ra7 Be8 23.a5 Bd7 24.a6 Bc8 25.Ra8 Kd7 26.a7 Bb7 27.Rf8 Kc7 28.a8Q Bxa8 29.Rxa8 c4 30.bxc4 Kd6 31.Ra7 Ke6 32.Rg7 Kd6 33.Rg6+ Kc7 34.Rf6 Kd7 35.Kb2 b3 36.Kxb3 c5 37.Rxf5 
  +- (8.96)  Depth: 36/62   00:00:20  744MN
6...hxg4 7.h5 Rh7 8.Qh4 Kd7 9.Qf6 Be6 10.h6 Rg8 11.Rh5 g3 12.Rg5 Rf7 13.h7 Rxf6 14.hxg8Q Bxg8 15.exf6 Bf7 16.Rxg3 Ke6 17.Rh3 Kxf6 18.Rh6+ Bg6 19.Rh8 Ke7 20.Ra8 Kd7 21.Rxa5 Kd6 22.Ra7 Be8 23.a5 Bd7 24.a6 Bc8 25.Ra8 Kd7 26.a7 Bb7 27.Rf8 Kc7 28.a8Q Bxa8 29.Rxa8 Kd6 30.Ra7 Kd5 31.Rh7 Kd6 32.Rg7 Ke6 33.Rg6+ Kd7 34.Rf6 Kc7 35.Rxf5 Kd6 36.Re5 Kc7 
  +- (8.96)  Depth: 37/61   00:00:24  860MN
6...hxg4 7.h5 Rh7 8.Qh4 Kd7 9.Qf6 Be6 10.h6 Rg8 11.Rh5 g3 12.Rg5 Rf7 13.h7 Rxf6 14.hxg8Q Bxg8 15.exf6 Bf7 16.Rxg3 Ke6 17.Rh3 Kxf6 18.Rh6+ Bg6 19.Rh8 Ke7 20.Ra8 Bf7 21.Ra7+ Ke8 22.Rxa5 Be6 23.Ra8+ Kd7 24.Ra7+ Kd8 25.Rh7 Bd5 26.Rb7 Kc8 27.Re7 Bf3 28.Re5 Bg4 29.Rxc5 Kc7 30.Rc4 Kb6 31.Rxb4+ Kc5 32.Rc4+ Kd5 33.b4 Bf3 34.Kd2 Kd6 35.Rxd4+ Kc7 36.Rc4 Bg2 37.Rc5 Bd5 38.a5 Kb7 39.Ke3 Kc7 40.Kd4 
  +- (8.95)  Depth: 38/68   00:00:26  949MN
6...hxg4 7.h5 Rh7 8.Qh4 Kd7 9.Qf6 Be6 10.h6 Rg8 11.Rh5 g3 12.Rg5 Rf7 13.h7 Rxf6 14.hxg8Q Bxg8 15.exf6 Bf7 16.Rxg3 Ke6 17.Rh3 Kxf6 18.Rh6+ Bg6 19.Rh8 Ke7 20.Ra8 Bf7 21.Ra7+ Ke8 22.Rxa5 Be6 23.Ra8+ Kd7 24.Ra7+ Kd8 25.Rh7 Bd5 26.Rb7 Kc8 27.Re7 Bg2 28.Re5 Bh3 29.Rxc5 Kb7 30.Rc4 Bg2 31.Kd2 Bh1 32.Rxb4+ Kc7 33.Rxd4 c5 34.Rc4 Kb6 35.d4 cxd4 36.Rb4+ Ka7 37.Rxd4 Bc6 38.a5 Ka6 39.Rd6 Kb5 40.a6 
  +- (8.96)  Depth: 39/68   00:00:29  1052MN
6...hxg4 7.h5 Rh7 8.Qh4 Kd7 9.Qf6 Be6 10.h6 Rg8 11.Rh5 g3 12.Rg5 Rf7 13.h7 Rxf6 14.hxg8Q Bxg8 15.exf6 Bf7 16.Rxg3 Ke6 17.Rh3 Kxf6 18.Rh6+ Bg6 19.Rh8 Ke7 20.Ra8 Bf7 21.Ra7+ Ke8 22.Rxa5 Be6 23.Ra8+ Kd7 24.Ra7+ Kd8 25.Rh7 Bd5 26.Rb7 Kc8 27.Re7 Bg2 28.Re5 Bh3 29.Rxc5 Kb7 30.Rc4 Bg2 31.Kd2 Bh1 32.Rxb4+ Kc7 33.Rxd4 c5 34.Rc4 Kb6 35.d4 cxd4 36.Rb4+ Ka7 37.Rxd4 Bc6 38.a5 Ka6 39.Rd6 Kb5 40.a6 
  +- (8.86 ++)  Depth: 40/62   00:00:30  1075MN
6...hxg4 7.h5 Rh7 8.Qh4 Kd7 9.Qf6 Be6 10.h6 Rg8 11.Rh5 g3 12.Rg5 Rf7 13.h7 Rxf6 14.hxg8Q Bxg8 15.exf6 Bf7 16.Rxg3 Ke6 17.Rh3 Kxf6 18.Rh6+ Bg6 19.Rh8 Ke7 20.Ra8 Bf7 21.Ra7+ Ke8 22.Rxa5 Be6 23.Ra8+ Kd7 24.Ra7+ Kd8 25.Rh7 Bd5 26.Rb7 Kc8 27.Re7 Bg2 28.Re5 Bh3 29.Rxc5 Kb7 30.Rc4 Bg2 31.Kd2 Bh1 32.Rxb4+ Kc7 33.Rxd4 c5 34.Rc4 Kb6 35.d4 cxd4 36.Rb4+ Ka7 37.Rxd4 Bc6 38.a5 Ka6 39.Rd6 Kb5 40.a6 
  +- (8.76 ++)  Depth: 40/62   00:00:30  1075MN
6...hxg4 7.h5 Rh7 8.Qh4 Kd7 9.Qf6 Be6 10.h6 Rg8 11.Rh5 g3 12.Rg5 Rf7 13.h7 Rxf6 14.hxg8Q Bxg8 15.exf6 Bf7 16.Rxg3 Ke6 17.Rh3 Kxf6 18.Rh6+ Bg6 19.Rh8 Ke7 20.Ra8 Bf7 21.Ra7+ Ke8 22.Rxa5 Be6 23.Ra8+ Kd7 24.Ra7+ Kd8 25.Rh7 Bd5 26.Rb7 Kc8 27.Re7 Bg2 28.Re5 Bh3 29.Rxc5 Kb7 30.Rc4 Bg2 31.Kd2 Bh1 32.Rxb4+ Kc7 33.Rxd4 c5 34.Rc4 Kb6 35.d4 cxd4 36.Rb4+ Ka7 37.Rxd4 Bc6 38.a5 Ka6 39.Rd6 Kb5 40.a6 
  +- (8.62 ++)  Depth: 40/62   00:00:30  1076MN
6...hxg4 7.h5 Rh7 8.Qh4 Kd7 9.Qf6 Be6 10.h6 g3 11.Rh5 Rg8 12.Rg5 Rf7 13.h7 Rxf6 14.hxg8Q Bxg8 15.exf6 Bf7 16.Rxg3 Ke6 17.Rh3 Kxf6 18.Rh6+ Bg6 19.Rh8 Ke7 20.Ra8 Bf7 21.Ra7+ Ke8 22.Rxa5 Be6 23.Ra8+ Kd7 24.Ra7+ Kd8 25.Rh7 Bd5 26.Rb7 Kc8 27.Re7 Bf3 28.Re5 Bg4 29.Rxc5 Kd7 30.Rc4 Kc7 31.Rxd4 
  +- (8.96)  Depth: 40/62   00:00:30  1094MN
6...hxg4 7.h5 Rh7 8.Qh4 Kd7 9.Qf6 Be6 10.h6 g3 11.Rh5 Rg8 12.Rg5 Rf7 13.h7 Rxf6 14.hxg8Q Bxg8 15.exf6 Bf7 16.Rxg3 Ke6 17.Rh3 Kxf6 18.Rh6+ Bg6 19.Rh8 Ke7 20.Ra8 Bf7 21.Ra7+ Ke8 22.Rxa5 Be6 23.Ra8+ Kd7 24.Ra7+ Kd8 25.Rh7 Bd5 26.Rb7 Kc8 27.Re7 Bf3 28.Re5 c4 29.bxc4 Bg4 30.Re7 Bh3 31.a5 Bg4 32.Kb2 Kb8 33.Kb3 Bd1 34.Rf7 Bg4 35.Kxb4 Bh5 36.Re7 
  +- (8.96)  Depth: 41/66   00:00:36  1295MN
6...hxg4 7.h5 Rh7 8.Qh4 Kd7 9.Qf6 Be6 10.h6 g3 11.Rh5 Rg8 12.Rg5 Rf7 13.h7 Rxf6 14.hxg8Q Bxg8 15.exf6 Bf7 16.Rxg3 Ke6 17.Rh3 Kxf6 18.Rh6+ Bg6 19.Rh8 Ke7 20.Ra8 Bf7 21.Ra7+ Ke8 22.Rxa5 Be6 23.Ra8+ Kd7 24.Ra7+ Kd8 25.Rh7 Bd5 26.Rb7 Kc8 27.Re7 Bf3 28.Re5 Bg4 29.Rxc5 Kc7 30.Rc4 Bh5 31.Rxd4 Be8 32.Kd2 c5 33.Rd5 Kc6 34.Rxf5 Bd7 35.Rf6+ Kc7 36.a5 Kb7 37.f5 Bxf5 38.Rxf5 Kc6 39.a6 Kb6 40.Kc1 
  +- (8.98)  Depth: 42/71   00:00:54  1889MN
6...hxg4 7.h5 Rh7 8.Qh4 Kd7 9.Qf6 Be6 10.h6 g3 11.Rh5 Rg8 12.Rg5 Rf7 13.h7 Rxf6 14.hxg8Q Bxg8 15.exf6 Bf7 16.Rxg3 Ke6 17.Rh3 Kxf6 18.Rh6+ Bg6 19.Rh8 Ke7 20.Ra8 Bf7 21.Ra7+ Ke8 22.Rxa5 Be6 23.Ra8+ Kd7 24.Ra7+ Kd8 25.Rh7 Bd5 26.Rb7 Be6 27.a5 Bc8 28.Rf7 c4 29.bxc4 c5 30.Ra7 Be6 31.a6 Bc8 32.Ra8 Kd7 33.a7 Bb7 34.Rb8 Kc6 35.Rf8 Kc7 36.a8Q Bxa8 37.Rxa8 Kb7 38.Rf8 Kc7 39.Rxf5 Kc6 40.Kb2 
  +- (8.99)  Depth: 43/68   00:01:11  2445MN
6...hxg4 7.h5 Rh7 8.Qh4 Kd7 9.Qf6 Be6 10.h6 g3 11.Rh5 Rg8 12.Rg5 Rf7 13.h7 Rxf6 14.hxg8Q Bxg8 15.exf6 Bf7 16.Rxg3 Ke6 17.Rh3 Kxf6 18.Rh6+ Bg6 19.Rh8 Ke7 20.Ra8 Bf7 21.Ra7+ Ke8 22.Rxa5 Be6 23.Ra8+ Kd7 24.Ra7+ Kd8 25.Rh7 Bd5 26.Rb7 Be6 27.a5 Bc8 28.Rf7 c4 29.bxc4 c5 30.Ra7 Be6 31.a6 Bc8 32.Ra8 Kd7 33.a7 Bb7 34.Rb8 Kc6 35.Rh8 Kd7 36.a8Q Bxa8 37.Rxa8 Kc7 38.Ra7+ Kd6 39.Rb7 Ke6 40.Rc7 Kd6 41.Rc8 
  +- (9.00)  Depth: 44/71   00:01:45  3637MN
6...hxg4 7.h5 Rh7 8.Qh4 Kd7 9.Qf6 Be6 10.h6 g3 11.Rh5 Rg8 12.Rg5 Rf7 13.h7 Rxf6 14.hxg8Q Bxg8 15.exf6 Bf7 16.Rxg3 Ke6 17.Rh3 Kxf6 18.Rh6+ Bg6 19.Rh8 Ke7 20.Ra8 Bf7 21.Ra7+ Ke8 22.Rxa5 Be6 23.Ra8+ Kd7 24.Ra7+ Kd8 25.Rh7 Bd5 26.Rb7 Kc8 27.Re7 Bf3 28.Re5 Kc7 29.Rxf5 Kb6 30.Rg5 Bh1 31.f5 Bd5 32.f6 Bf7 33.Rg7 Be6 34.f7 Bxf7 35.Rxf7 Ka6 36.Rf6 Kb6 37.Rf5 c4 38.a5+ Ka6 39.bxc4 Ka7 40.Kb2 Ka6 41.Kb3 c5 
  +- (9.00)  Depth: 45/71   00:02:10  4555MN
6...hxg4 7.h5 Rh7 8.Qh4 Kd7 9.Qf6 Be6 10.h6 g3 11.Rh5 Rg8 12.Rg5 Rf7 13.h7 Rxf6 14.hxg8Q Bxg8 15.exf6 Bf7 16.Rxg3 Ke6 17.Rh3 Kxf6 18.Rh6+ Bg6 19.Rh8 Ke7 20.Ra8 Bf7 21.Ra7+ Ke8 22.Rxa5 Be6 23.Ra8+ Kd7 24.Ra7+ Kd8 25.Rh7 Bd5 26.Rb7 Kc8 27.Re7 Bf3 28.Re5 Kc7 29.Rxf5 Kb6 30.Rg5 Bh1 31.f5 Bd5 32.f6 Bf7 33.Rg7 Be6 34.f7 Bxf7 35.Rxf7 Ka6 36.Rf6 Kb6 37.Rf5 c4 38.a5+ Ka6 39.bxc4 Ka7 40.Kb2 Ka6 41.Kb3 c5 
  +- (9.10 --)  Depth: 46/72   00:03:25  7177MN
6...hxg4 7.h5 Rh7 8.Qh4 Kd7 9.Qf6 Be6 10.h6 g3 11.Rh5 Rg8 12.Rg5 Rf7 13.h7 Rxf6 14.hxg8Q Bxg8 15.exf6 Bf7 16.Rxg3 Ke6 17.Rh3 Kxf6 18.Rh6+ Bg6 19.Rh8 Ke7 20.Ra8 Be8 21.Rxa5 Bg6 22.Rxc5 Kd6 23.Ra5 Kd7 24.Ra7+ Kc8 25.Ra8+ Kc7 26.Rf8 Kb6 27.Rf6 Bh7 28.Rf7 Bg6 29.Rd7 Be8 30.Rxd4 Ka5 31.Kd2 Bf7 32.Rd6 Be8 33.Ke3 Ka6 34.Rd4 c5 35.Rd5 Kb6 36.Rxf5 Kc6 37.Kd2 Bd7 38.Rg5 Be8 39.f5 Kd6 40.a5 Kc6 41.f6 Kb5 42.a6 Kxa6 43.Rxc5 
  +- (9.10)  Depth: 46/74   00:04:09  8691MN
6...hxg4 7.h5 Rh7 8.Qh4 Kd7 9.Qf6 Be6 10.h6 g3 11.Rh5 Rg8 12.Rg5 Rf7 13.h7 Rxf6 14.hxg8Q Bxg8 15.exf6 Bf7 16.Rxg3 Ke6 17.Rh3 Kxf6 18.Rh6+ Bg6 19.Rh8 Ke7 20.Ra8 Be8 21.Rxa5 Bg6 22.Rxc5 Kd6 23.Ra5 Kd7 24.Ra7+ Kc8 25.Ra8+ Kc7 26.Rf8 Kb6 27.Rf6 Bh7 28.Rf7 Bg6 29.Rd7 Be8 30.Rxd4 Ka5 31.Kd2 Bf7 32.Rd6 Be8 33.Ke3 Ka6 34.Rd4 c5 35.Rd5 Kb6 36.Kd2 Bc6 37.Rxf5 Bf3 38.Rg5 Kc6 39.Kc1 Bd5 40.Rg6+ Kb7 41.Rg7+ Kc6 42.Rg5 Bf7 43.Rf5 Bd5 44.a5 
  +- (9.10)  Depth: 47/80   00:04:17  8996MN
6...hxg4 7.h5 Rh7 8.Qh4 Kd7 9.Qf6 Be6 10.h6 g3 11.Rh5 Rg8 12.Rg5 Rf7 13.h7 Rxf6 14.hxg8Q Bxg8 15.exf6 Bf7 16.Rxg3 Ke6 17.Rh3 Kxf6 18.Rh6+ Bg6 19.Rh8 Ke7 20.Ra8 Be8 21.Rxa5 Bg6 22.Rxc5 Kd6 23.Ra5 Kd7 24.Ra7+ Kc8 25.Ra8+ Kc7 26.Rf8 Kb6 27.Rf6 Bh7 28.Rf7 Bg6 29.Rd7 Be8 30.Rxd4 Ka5 31.Kd2 Bf7 32.Rd6 Be8 33.Ke3 Ka6 34.Rd4 c5 35.Rd5 Kb6 36.Kd2 Bc6 37.Rxf5 Bf3 38.Rg5 Kc6 39.Kc1 Bd5 40.Rg6+ Kb7 41.Rg7+ Kc6 42.Rg5 Bf7 43.Rf5 Bd5 44.a5 
  +- (9.20 --)  Depth: 48/78   00:05:35  11729MN
6...hxg4 7.h5 Rh7 8.Qh4 Kd7 9.Qf6 Be6 10.h6 g3 11.Rh5 Rg8 12.Rg5 Rf7 13.h7 Rxf6 14.hxg8Q Bxg8 15.exf6 Bf7 16.Rxg3 Ke6 17.Rh3 Kxf6 18.Rh6+ Bg6 19.Rh8 Ke7 20.Ra8 Be8 21.Rxa5 Bg6 22.Rxc5 Kd6 23.Ra5 Kd7 24.Ra7+ Kc8 25.Ra8+ Kc7 26.Rf8 Kb6 27.Rf6 Bh7 28.Rf7 Bg6 29.Rd7 Be8 30.Rxd4 Ka5 31.Kd2 Bf7 32.Rd6 Be8 33.Ke3 Ka6 34.Rd8 Bh5 35.Rb8 Bd1 36.Kd2 Bf3 37.Rxb4 Ka7 38.Ke3 Bd5 39.Kd4 Bf3 40.Rc4 Kb7 41.Rc5 Bd1 42.Ke3 Bxc2 43.Rxc2 Kc7 44.b4 
  +- (9.20)  Depth: 48/78   00:05:45  12078MN
6...hxg4 7.h5 Rh7 8.Qh4 Kd7 9.Qf6 Be6 10.h6 g3 11.Rh5 Rg8 12.Rg5 Rf7 13.h7 Rxf6 14.hxg8Q Bxg8 15.exf6 Bf7 16.Rxg3 Ke6 17.Rh3 Kxf6 18.Rh6+ Bg6 19.Rh8 Ke7 20.Ra8 Be8 21.Rxa5 Bg6 22.Rxc5 Kd6 23.Ra5 Kd7 24.Ra7+ Kc8 25.Ra8+ Kc7 26.Rf8 Kb6 27.Rf6 Bh7 28.Rf7 Bg6 29.Rd7 Be8 30.Rxd4 Ka5 31.Kd2 Bf7 32.Rd6 Be8 33.Ke3 Kb6 34.Rd8 Bf7 35.Rf8 Bd5 36.Rb8+ Ka5 37.Kd4 Bh1 38.Kc5 Ka6 39.Rxb4 Bf3 40.Kd4 Bd1 41.Rc4 Kb6 42.b4 Kc7 43.Ke3 Kb6 44.Rc5 Bxc2 45.Rxc2 
  +- (9.21)  Depth: 49/81   00:07:55  16619MN
6...hxg4 7.h5 Rh7 8.Qh4 Kd7 9.Qf6 Be6 10.h6 g3 11.Rh5 Rg8 12.Rg5 Rf7 13.h7 Rxf6 14.hxg8Q Bxg8 15.exf6 Bf7 16.Rxg3 Ke6 17.Rh3 Kxf6 18.Rh6+ Bg6 19.Rh8 Ke7 20.Ra8 Be8 21.Rxa5 Bg6 22.Rxc5 Kd6 23.Ra5 Kd7 24.Ra7+ Kc8 25.Ra8+ Kc7 26.Rf8 Kb6 27.Rf6 Bh7 28.Rf7 Bg6 29.Rd7 Be8 30.Rxd4 Ka5 31.Kd2 Bf7 32.Rd6 Be8 33.Ke3 Kb6 34.Rd8 Bf7 35.Rf8 Bd5 36.Rb8+ Ka5 37.Kd4 Bh1 38.Kc5 Ka6 39.Rxb4 Bf3 40.Kd4 Bd1 41.Rc4 Kb6 42.b4 Kc7 43.Ke3 Kb6 44.Rc5 Bxc2 45.Rxc2 
  +- (9.30 --)  Depth: 50/79   00:10:32  22191MN
6...hxg4 7.h5 Rh7 8.Qh4 Kd7 9.Qf6 Be6 10.h6 g3 11.Rh5 Rg8 12.Rg5 Rf7 13.h7 Rxf6 14.hxg8Q Bxg8 15.exf6 Bf7 16.Rxg3 Ke6 17.Rh3 Kxf6 18.Rh6+ Bg6 19.Rh8 Ke7 20.Ra8 Be8 21.Rxa5 Bg6 22.Rxc5 Kd6 23.Ra5 Kd7 24.Ra7+ Kc8 25.Ra8+ Kc7 26.Rf8 Kb6 27.Rf6 Bh7 28.Rf7 Bg6 29.Rd7 Be8 30.Rxd4 Ka5 31.Kd2 Bf7 32.Rd6 Be8 33.Ke3 Kb6 34.Rd8 Bf7 35.Rf8 Bd5 36.Rb8+ Ka5 37.Kd4 Bh1 38.Kc5 Ka6 39.Rxb4 Bf3 40.Kd4 Bd1 41.Rc4 Kb6 42.b4 Kc7 43.Ke3 Kb6 44.Rc5 Bxc2 45.Rxc2 
  +- (9.39 --)  Depth: 50/79   00:13:07  27700MN
6...hxg4 7.h5 Rh7 8.Qh4 Kd7 9.Qf6 Be6 10.h6 g3 11.Rh5 Rg8 12.Rg5 Rf7 13.h7 Rxf6 14.hxg8Q Bxg8 15.exf6 Bf7 16.Rxg3 Ke6 17.Rh3 Kxf6 18.Rh6+ Bg6 19.Rh8 Ke7 20.Ra8 Be8 21.Rxa5 Bg6 22.Rxc5 Kd6 23.Ra5 Kd7 24.Ra7+ Kc8 25.Ra8+ Kc7 26.Rf8 Kb6 27.Rf6 Bh7 28.Rf7 Bg6 29.Rd7 Be8 30.Rxd4 Ka5 31.Kd2 Bf7 32.Rd6 Be8 33.Ke3 Kb6 34.Rd8 Bf7 35.Rf8 Bd5 36.Rb8+ Ka5 37.Kd4 Bh1 38.Kc5 Ka6 39.Rxb4 Bf3 40.Kd4 Bd1 41.Rc4 Kb6 42.b4 Kc7 43.Ke3 Kb6 44.Rc5 Bxc2 45.Rxc2 
  +- (9.30 ++)  Depth: 50/79   00:13:08  27766MN
6...hxg4 7.h5 Rh7 8.Qh4 Kd7 9.Qf6 Be6 10.h6 g3 11.Rh5 Rg8 12.Rg5 Rf7 13.h7 Rxf6 14.hxg8Q Bxg8 15.exf6 Bf7 16.Rxg3 Ke6 17.Rh3 Kxf6 18.Rh6+ Bg6 19.Rh8 Ke6 20.Ra8 Kd6 21.Rxa5 c4 22.bxc4 b3 23.cxb3 Kd7 24.Ra7+ Kc8 25.Rg7 Bh5 26.Re7 Kd8 27.Re5 Bg4 28.b4 Kc7 29.a5 Kb8 30.Kc2 Bh3 31.Re7 Bg4 32.a6 Bh5 33.b5 cxb5 34.cxb5 Bf3 
  +- (9.39)  Depth: 50/79   00:13:10  27824MN
6...hxg4 7.h5 Rh7 8.Qh4 Kd7 9.Qf6 Be6 10.h6 g3 11.Rh5 Rg8 12.Rg5 Rf7 13.h7 Rxf6 14.hxg8Q Bxg8 15.exf6 Bf7 16.Rxg3 Ke6 17.Rh3 Kxf6 18.Rh6+ Bg6 19.Rh8 Ke6 20.Ra8 Kd6 21.Rxa5 c4 22.bxc4 b3 23.cxb3 Kd7 24.Ra7+ Kc8 25.Rg7 Bh5 26.Re7 Kd8 27.Re5 Bg4 28.b4 Kc7 29.a5 Kb8 30.Kc2 Bh3 31.Re7 Bg4 32.a6 Bh5 33.b5 cxb5 34.cxb5 Bf3 
  +- (9.49 --)  Depth: 51/65   00:15:59  33859MN
6...hxg4 7.h5 Rh7 8.Qh4 Kd7 9.Qf6 Be6 10.h6 g3 11.Rh5 Rg8 12.Rg5 Rf7 13.h7 Rxf6 14.hxg8Q Bxg8 15.exf6 Bf7 16.Rxg3 Ke6 17.Rh3 Kxf6 18.Rh8 Ke7 19.Ra8 Bd5 20.Rxa5 Kd7 21.Ra7+ Kd8 22.Rb7 Kc8 23.Re7 Bf3 24.Re5 Bg4 25.Rxc5 Kc7 26.Rc4 Bf3 27.Rxd4 c5 28.Rc4 Kb6 29.d4 cxd4 30.Rxb4+ Kc6 31.Rxd4 Kc5 32.Rc4+ Kb6 33.Rb4+ Ka7 34.Kd2 Bg2 35.Rd4 Kb7 36.Rd6 Bc6 37.a5 Kc7 38.Re6 Bd5 39.Re5 Be4 40.Rb5 Kc6 41.Rb6+ Kd5 42.Rb8 Kc5 43.a6 Bc6 
  +- (9.53)  Depth: 51/77   00:17:06  36330MN
Top
Dann Corbit
Posts: 12538
Joined: Wed Mar 08, 2006 8:57 pm
Location: Redmond, WA USA

Re: An apparent fortress, but there is a move that looks like it wins.

Post by Dann Corbit »

At around ply 36, it looked like a fortress was formed. But at ply 48 a breakthrough was made and it seems a clear win. Position after the key move:
[d]3r4/3r4/2p1k3/p1pbPp1p/Pp1p1PRP/1P1P4/2P4R/2K1Q3 b - - acd 49; ce -1035; acs 9780; acn 121475000; pv hxg4 h5 Rh7 Qh4 Kd7 e6+ Bxe6 Re2 Re8 Re5 Kd6 Kb2 Rh6 Qg5 Reh8 Kc1 R6h7 Qf6 Re8 h6 g3 Rxe6+ Rxe6 Qd8+ Rd7 Qb8+ Ke7 h7 Rd8 Qc7+ Rd7 Qxd7+ Kxd7 h8=Q Kc7 Qh7+ Kd6 Qg7 Re1+ Kb2 Re3 Qh6+ Kc7 Qh7+ Kb6 Qxf5 Re2 Qc8 g2 Qb8+ Ka6 Qg8 Kb6 Qg3 Kc7 f5+ Kd7 Qg4 Kd8 f6 Rf2 Qg7 c4 bxc4 c5 Qg8+ Kd7 f7 g1=Q Qxg1 Rxf7 Qg5 Ke6 Qd5+ Kf6 Qxc5 Rh7 Qxd4+ Kg6 Qb6+ Kg7 Qxa5 Rh8 Qd5 Kh7 Qf7+ Kh6 ; bm hxg4;

Code: Select all

3r4/3r4/2p1k3/p1pbPp1p/Pp1p1PRP/1P1P4/2P4R/2K1Q3 b - - acd 26; ce -506; acs 2; acn 23486; pv hxg4 h5 Rh8 Qh4 Rf7 Qg5 Kd7 h6 Kc7 Qg6 Kb6 Rh5 Rc7 h7 Re7 Rh6 Ka6 Kd2 g3 Ke1 Kb6 Kf1 Ka6 Kg1 g2 Rh4 Kb7 Qxf5 Rg7 e6 ; bm hxg4;
3r4/3r4/2p1k3/p1pbPp1p/Pp1p1PRP/1P1P4/2P4R/2K1Q3 b - - acd 27; ce -506; acs 2; acn 24505; pv hxg4 h5 Rh7 Qh4 Kd7 Qf6 Be6 h6 Rg8 Rh5 g3 Rg5 Rf7 h7 Rxf6 hxg8=R Bxg8 exf6 Bf7 Rxg3 Ke6 Rh3 Kxf6 Rh8 Ke7 Ra8 Bd5 Rxa5 Kd8 Ra7 Kc8 a5 Kb8 Rh7 Bf3 Rf7 Bg4 Kb2 Bf3 Rxf5 Kb7 ; bm hxg4;
3r4/3r4/2p1k3/p1pbPp1p/Pp1p1PRP/1P1P4/2P4R/2K1Q3 b - - acd 28; ce -463; acs 2; acn 32081; pv hxg4 h5 Rh7 Qh4 Kd7 Qf6 Be6 h6 Rg8 Rh5 g3 Rg5 Rf7 h7 Rxf6 hxg8=Q Bxg8 exf6 Bf7 Rxg3 Ke6 Rh3 Kxf6 Rh8 Ke7 Ra8 Bh5 Rxa5 Bg4 Ra7+ Kd8 a5 Kc8 Rf7 Kb8 ; bm hxg4;
3r4/3r4/2p1k3/p1pbPp1p/Pp1p1PRP/1P1P4/2P4R/2K1Q3 b - - acd 29; ce -531; acs 4; acn 49230; pv hxg4 h5 Rh8 Qh4 Rf7 Qg5 Kd7 h6 Kc7 Qg6 Rfh7 Rh5 Kb6 e6 g3 Qxg3 Bxe6 Qg5 Bf7 Rh3 Be6 Qf6 Bd5 Kb2 Ka6 Qd6 Re8 Qg6 Reh8 Rh5 Kb7 Qd6 Kb6 Kc1 Ka6 Qxc5 Rxh6 Rxf5 ; bm hxg4;
3r4/3r4/2p1k3/p1pbPp1p/Pp1p1PRP/1P1P4/2P4R/2K1Q3 b - - acd 30; ce -538; acs 5; acn 57547; pv hxg4 h5 Rh7 Qh4 Kd7 Qf6 Be6 h6 Rg8 Rh5 g3 Rg5 Rf7 h7 Rxf6 hxg8=Q Bxg8 exf6 Bf7 Rxg3 Ke6 Rh3 Kxf6 Rh8 Ke7 Ra8 Bh5 Rxa5 Bg4 Rxc5 Kd6 Re5 Kc7 a5 Kb7 Rc5 Ka6 Kd2 Kb7 Rc4 Ka6 Rxc6+ Kxa5 Rd6 Bf3 ; bm hxg4;
3r4/3r4/2p1k3/p1pbPp1p/Pp1p1PRP/1P1P4/2P4R/2K1Q3 b - - acd 31; ce -551; acs 7; acn 84952; pv hxg4 h5 Rh7 Qh4 Kd7 Qf6 Be6 h6 g3 Rh5 Rg8 Rg5 Rf7 h7 Rxf6 hxg8=Q Bxg8 exf6 Bf7 Rxg3 Ke6 Rh3 Kxf6 Rh6+ Bg6 Rh8 Ke7 Ra8 Bh5 Rxa5 Bg4 Rxc5 Kd6 Re5 Kc7 a5 Kb7 Rc5 Bh3 Kd2 Bg4 Rc4 Ka6 Rxc6+ Kxa5 Rc5+ Kb6 Rd5 ; bm hxg4;
3r4/3r4/2p1k3/p1pbPp1p/Pp1p1PRP/1P1P4/2P4R/2K1Q3 b - - acd 32; ce -554; acs 8; acn 94690; pv hxg4 h5 Rh8 Qh4 Rf7 Qg5 Kd7 Qg6 Kc7 h6 Rfh7 Rh5 Kb6 e6 g3 Qxg3 Bxe6 Qg5 Bd5 Rh3 Rf8 Kb2 Ka6 Qg6 Rfh8 Qf6 Kb6 Qd6 Re8 Qg6 Ree7 Rg3 Kb7 Qf6 Ka6 Rg7 Rhxg7 hxg7 Re1 ; bm hxg4;
3r4/3r4/2p1k3/p1pbPp1p/Pp1p1PRP/1P1P4/2P4R/2K1Q3 b - - acd 33; ce -561; acs 9; acn 110544; pv hxg4 h5 Rh7 Qh4 Kd7 Qf6 Be6 h6 g3 Rh5 Rg8 Rg5 Rf7 h7 Rxf6 hxg8=R Bxg8 exf6 Bf7 Rxg3 Ke6 Rh3 Kxf6 Rh6+ Bg6 Rh8 Ke7 Ra8 Bf7 Rxa5 Bd5 Ra8 Kd7 Rf8 Be6 Rf6 Ke7 Rh6 Kd7 Rh7+ Kc8 Re7 ; bm hxg4;
3r4/3r4/2p1k3/p1pbPp1p/Pp1p1PRP/1P1P4/2P4R/2K1Q3 b - - acd 34; ce -567; acs 11; acn 129258; pv hxg4 h5 Rh8 Qh4 Rf7 Qg5 Kd7 Qg6 Kc7 h6 Kb6 h7 Ka6 Rh6 Re7 Kd1 g3 Ke1 Kb7 Rh4 Kb6 Kf1 Rf7 Rh6 Re7 Kg1 g2 Kf2 Kb7 Rh4 Kb6 Rh5 Ka6 Kg1 Ka7 Rh4 Rf7 Rh6 Kb6 e6 ; bm hxg4;
3r4/3r4/2p1k3/p1pbPp1p/Pp1p1PRP/1P1P4/2P4R/2K1Q3 b - - acd 35; ce -585; acs 15; acn 179876; pv hxg4 h5 Rh7 Qh4 Kd7 Qf6 Be6 h6 Rg8 Rh5 g3 Rg5 Rf7 h7 Rxf6 hxg8=Q Bxg8 exf6 Bf7 Rxg3 Ke6 Rh3 Kxf6 Rh6+ Bg6 Rh8 Ke7 Ra8 Bf7 Ra7+ Ke8 Rxa5 Bd5 Ra8+ Kd7 Rf8 Be6 a5 Kc7 Rf6 Bc8 Rf7+ Kb8 Rf8 Kc7 Rf6 Kb7 Rh6 Kc7 Rh7+ Kb8 Rf7 Be6 Rf6 Bd5 Rxf5 Kb7 Rf8 ; bm hxg4;
3r4/3r4/2p1k3/p1pbPp1p/Pp1p1PRP/1P1P4/2P4R/2K1Q3 b - - acd 26; ce -492; acs 3; acn 42480; pv hxg4 h5 Rh8 Qh4 Rf7 h6 Kd7 Qg5 Kc7 Rh5 Kb6 Qg6 Rfh7 e6 Re7 h7 Rxe6 Qg7 Ree8 Kb2 Be6 Qf6 Bd5 Rxf5 Be6 Re5 Rxh7 Rxe6 Rxe6 ; bm hxg4;
3r4/3r4/2p1k3/p1pbPp1p/Pp1p1PRP/1P1P4/2P4R/2K1Q3 b - - acd 27; ce -506; acs 4; acn 48442; pv hxg4 h5 Rh7 Qh4 Kd7 e6+ Bxe6 Re2 Re8 Re5 Kd6 h6 Rf7 Qg5 Rfe7 Qf6 g3 Qg6 Rh8 Kb2 g2 Qxg2 Rxh6 Qg5 Rh8 Qf6 Rh1 Qf8 ; bm hxg4;
3r4/3r4/2p1k3/p1pbPp1p/Pp1p1PRP/1P1P4/2P4R/2K1Q3 b - - acd 28; ce -559; acs 9; acn 108198; pv hxg4 h5 Rh7 Qh4 Kd7 e6+ Bxe6 Re2 Rf8 Re5 Kd6 Qg5 Re8 Qg6 Rhe7 Rxf5 Rg8 Qf6 g3 Rg5 Kd7 Rxg8 Bxg8 Qg5 Bh7 Qxg3 c4 bxc4 b3 cxb3 Bf5 h6 ; bm hxg4;
3r4/3r4/2p1k3/p1pbPp1p/Pp1p1PRP/1P1P4/2P4R/2K1Q3 b - - acd 29; ce -619; acs 17; acn 198914; pv hxg4 h5 Rh7 Qh4 Kd7 e6+ Bxe6 Re2 Re8 Re5 Kd6 h6 Rhe7 Qf6 g3 Rxf5 Kc7 Re5 Kd7 Rg5 Rf7 Rg7 g2 Qg6 Rxg7 Qxg7+ Kd6 Qxg2 c4 Qg6 Rg8 Qf6 cxd3 cxd3 ; bm hxg4;
3r4/3r4/2p1k3/p1pbPp1p/Pp1p1PRP/1P1P4/2P4R/2K1Q3 b - - acd 30; ce -622; acs 19; acn 220463; pv hxg4 h5 Rh7 Qh4 Kd7 e6+ Bxe6 Re2 Re8 Re5 Kd6 h6 Rhe7 Qf6 g3 Rxf5 Kc7 Re5 Kd7 Rg5 Rf7 Rg7 g2 Qg5 Rh8 Rxf7+ Bxf7 Qxg2 Rxh6 Qg7 Rh1+ Kb2 Ke7 Qg5+ Ke6 Qe5+ Kd7 Qf5+ Be6 Qxc5 Rf1 Qxd4+ Bd5 Qa7+ Ke6 ; bm hxg4;
3r4/3r4/2p1k3/p1pbPp1p/Pp1p1PRP/1P1P4/2P4R/2K1Q3 b - - acd 31; ce -660; acs 33; acn 380003; pv hxg4 h5 Rh8 Qh4 Rf7 h6 Kd7 Qg5 Kc7 Rh5 Kb6 Qg6 Rfh7 e6 g3 Qxg3 Bxe6 Qg5 Bd5 Rh3 Be6 Qg6 Bd7 Qd6 Bc8 Qf6 Bd7 Rh5 Bc8 Kb2 Bd7 Qe5 Rc8 Qd6 Rc7 Rg5 Bc8 Rg6 Bb7 Qd5 ; bm hxg4;
3r4/3r4/2p1k3/p1pbPp1p/Pp1p1PRP/1P1P4/2P4R/2K1Q3 b - - acd 32; ce -669; acs 42; acn 480811; pv hxg4 h5 Rh8 Qh4 Rf7 Qg5 Kd7 h6 Kc7 Rh5 Kb6 Qg6 Rfh7 e6 g3 Qxg3 Bxe6 Qg5 Bd5 Rh3 Re8 Qg6 Reh8 Kb2 Ka6 Qf6 Kb6 Qg5 Kb7 Kc1 Be6 Qf6 Bd7 Rh5 Re8 Kb2 Kb6 Rg5 Reh8 Qd6 Re8 Rg7 Rxg7 hxg7 Be6 Qe5 ; bm hxg4;
3r4/3r4/2p1k3/p1pbPp1p/Pp1p1PRP/1P1P4/2P4R/2K1Q3 b - - acd 33; ce -669; acs 42; acn 483660; pv hxg4 h5 Rh8 Qh4 Rf7 Qg5 Kd7 h6 Kc7 Rh5 Kb6 Qg6 Rfh7 e6 g3 Qxg3 Bxe6 Qg5 Bd5 Rh3 Re8 Qg6 Reh8 Kb2 Ka6 Qf6 Kb6 Qg5 Kb7 Kc1 Be6 Qf6 Bd7 Rh5 Re8 Kb2 Kb6 Rg5 Reh8 Qd6 Re8 Rg7 Rxg7 hxg7 Be6 Qe5 ; bm hxg4;
3r4/3r4/2p1k3/p1pbPp1p/Pp1p1PRP/1P1P4/2P4R/2K1Q3 b - - acd 34; ce -669; acs 43; acn 496766; pv hxg4 h5 Rh8 Qh4 Rf7 Qg5 Kd7 h6 Kc7 Rh5 Kb6 Qg6 Rfh7 e6 g3 Qxg3 Bxe6 Qg5 Bd5 Rh3 Re8 Qg6 Reh8 Kb2 Ka6 Qf6 Kb6 Qg5 Kb7 Kc1 Be6 Qf6 Bd7 Rh5 Re8 Kb2 Kb6 Rg5 Reh8 Qd6 Re8 Rg7 Rxg7 hxg7 Be6 Qe5 Bd7 Qf6 ; bm hxg4;
3r4/3r4/2p1k3/p1pbPp1p/Pp1p1PRP/1P1P4/2P4R/2K1Q3 b - - acd 35; ce -669; acs 43; acn 502250; pv hxg4 h5 Rh8 Qh4 Rf7 Qg5 Kd7 h6 Kc7 Rh5 Kb6 Qg6 Rfh7 e6 g3 Qxg3 Bxe6 Qg5 Bf7 Rh3 Be6 Qf6 Bc8 Rh5 Bd7 Kb2 Bc8 Qd6 Rc7 Rg5 Rhh7 Rg6 Rhf7 Qd8 Kb7 Qh8 Rce7 Rg7 Be6 Rxf7 Rxf7 Qg8 ; bm hxg4;
3r4/3r4/2p1k3/p1pbPp1p/Pp1p1PRP/1P1P4/2P4R/2K1Q3 b - - acd 36; ce -713; acs 78; acn 900094; pv hxg4 h5 Rh8 Qh4 Rf7 Qg5 Kd7 h6 Kc7 Rh5 Kb6 Qg6 Rfh7 e6 g3 Qxg3 Bxe6 Qg5 Bd5 Rh3 Rf7 Kb2 Ka6 Qg6 Rfh7 Qf6 Kb6 Qg5 Rf7 Qg6 Rff8 Qd6 Rd8 Qe7 Rdf8 Rh5 Rf7 Qe5 Rhh7 Qd6 Rd7 Qb8+ Rb7 Qd8+ Ka6 Qc8 Kb6 Qxf5 Rbe7 ; bm hxg4;
3r4/3r4/2p1k3/p1pbPp1p/Pp1p1PRP/1P1P4/2P4R/2K1Q3 b - - acd 37; ce -687; acs 102; acn 1181000; pv hxg4 h5 Rh7 Qh4 Kd7 e6+ Bxe6 Re2 Rg8 Qf6 Re8 Qg6 Rhe7 Re5 Rg8 Qf6 Rge8 Rxc5 g3 Rxa5 g2 Qxd4+ Bd5 Kb2 Re1 Rxd5+ cxd5 Qxd5+ Kc7 Qc5+ Kb7 Qxb4+ Ka8 Qa5+ Kb7 Qd5+ Kb8 Qxg2 R1e2 Qg7 Rc8 h6 Rexc2+ Ka3 R2c7 Qe5 Ka8 Qxf5 Rh8 Qa5+ Kb8 Qb6+ Kc8 Qd6 Rhh7 f5 Kb7 ; bm hxg4;
3r4/3r4/2p1k3/p1pbPp1p/Pp1p1PRP/1P1P4/2P4R/2K1Q3 b - - acd 38; ce -731; acs 118; acn 1368000; pv hxg4 h5 Rh8 Qh4 Rf7 Qg5 Kd7 h6 Kc7 Qg6 Kb6 Rh5 Rfh7 e6 g3 Qxg3 Bxe6 Qg5 Re8 Kb2 Reh8 Qf6 Bd5 Qd6 Ka6 Kc1 Kb6 Kb1 Ka6 Kb2 Kb6 Rh3 Bf7 Qe5 Rg8 Qxf5 Bg6 Qf6 Bf7 Rh2 Bd5 Rh5 Rgh8 Kb1 Bf7 Rg5 Bxb3 Qd6 Rxh6 ; bm hxg4;
3r4/3r4/2p1k3/p1pbPp1p/Pp1p1PRP/1P1P4/2P4R/2K1Q3 b - - acd 39; ce -731; acs 118; acn 1370000; pv hxg4 h5 Rh8 Qh4 Rf7 Qg5 Kd7 h6 Kc7 Qg6 Kb6 Rh5 Rfh7 e6 g3 Qxg3 Bxe6 Qg5 Re8 Kb2 Reh8 Rh3 Bd7 Qf6 Rg8 Qd6 Be8 Qe5 Bg6 Qe6 Bf7 Qxf5 Bg6 Qe6 Bf7 Qf6 Be8 Qd8+ Ka6 Qc8+ Kb6 Qb8+ Ka6 Qd8 Rgh8 ; bm hxg4;
3r4/3r4/2p1k3/p1pbPp1p/Pp1p1PRP/1P1P4/2P4R/2K1Q3 b - - acd 40; ce -723; acs 118; acn 1373000; pv hxg4 h5 Rh8 Qh4 Rf7 Qg5 Kd7 h6 Kc7 Qg6 Kb6 Rh5 Rfh7 e6 g3 Qxg3 Bxe6 Qg5 Re8 Kb2 Reh8 Rh3 Bd5 Qg6 Ka6 Qf6 Kb6 Kc1 Ka6 Rh5 Bf3 Rxf5 Rxh6 Qe7 Bd5 Qxc5 Ra8 Qxd4 Rah8 Qc5 R8h7 Kb2 Rf7 ; bm hxg4;
3r4/3r4/2p1k3/p1pbPp1p/Pp1p1PRP/1P1P4/2P4R/2K1Q3 b - - acd 41; ce -723; acs 131; acn 1513000; pv hxg4 h5 Rh8 Qh4 Rf7 Qg5 Kd7 h6 Kc7 Qg6 Kb6 Rh5 Rfh7 e6 g3 Qxg3 Bxe6 Qg5 Re8 Kb2 Reh8 Rh3 Bd5 Qg6 Ka6 Qf6 Kb6 Kc1 Ka6 Rh5 Bf3 Rxf5 Rxh6 Qe7 Bd5 Qxc5 Ra8 Qxd4 Rah8 Qc5 R8h7 Kb2 Rf7 Re5 Rhh7 f5 Rh6 Re8 ; bm hxg4;
3r4/3r4/2p1k3/p1pbPp1p/Pp1p1PRP/1P1P4/2P4R/2K1Q3 b - - acd 42; ce -731; acs 155; acn 1794000; pv hxg4 h5 Rh8 Qh4 Rf7 Qg5 Kd7 h6 Kc7 Qg6 Kb6 Rh5 Rfh7 e6 g3 Qxg3 Bxe6 Qg5 Re8 Kb2 Reh8 Rh3 Bd5 Qg6 Ka6 Qf6 Kb6 Qg5 Rf7 Qg6 Rff8 Qd6 Rd8 Qe7 Rde8 Qd7 Ref8 Rg3 Rd8 Qg7 Rhg8 Qe7 Rge8 Qh4 Rd7 Qf6 Rf7 Qd6 Re6 Qd8+ Ka6 Qh8 Ree7 Qa8+ Ra7 Qc8+ Rab7 Rg7 Rxg7 hxg7 ; bm hxg4;
3r4/3r4/2p1k3/p1pbPp1p/Pp1p1PRP/1P1P4/2P4R/2K1Q3 b - - acd 43; ce -730; acs 166; acn 1912000; pv hxg4 h5 Rh8 Qh4 Rf7 Qg5 Kd7 h6 Kc7 Qg6 Rfh7 Rh5 Kb6 e6 g3 Qxg3 Bxe6 Qg5 Bd5 Rh3 Rg8 Qf6 Rgh8 Kb2 Ka6 Qg5 Be6 Qg6 Bd5 Qf6 Kb6 Qd6 Ka6 Rh5 Kb6 Kb1 Ka6 Rxf5 Rxh6 Qxc5 Rg6 Kb2 Rgh6 Re5 R6h7 f5 Rf7 Qxd4 Rhf8 f6 Rb7 Re7 Rxe7 fxe7 Re8 Qc5 Rh8 Qd6 Rg8 ; bm hxg4;
3r4/3r4/2p1k3/p1pbPp1p/Pp1p1PRP/1P1P4/2P4R/2K1Q3 b - - acd 44; ce -731; acs 177; acn 2050000; pv hxg4 h5 Rh8 Qh4 Rf7 Qg5 Kd7 h6 Kc7 Qg6 Rfh7 Rh5 Kb6 e6 g3 Qxg3 Bxe6 Qg5 Bd5 Rh3 Rg8 Qf6 Rgh8 Kb2 Ka6 Qd6 Re8 Qg6 Reh8 Qf6 Kb6 Qd6 Ka6 Rh5 Kb6 Kc1 Ka6 Qxc5 Rxh6 Rxf5 Rb8 Kb2 Ra8 Qxd4 Rhh8 Qc5 Rhc8 Rh5 Rh8 Rg5 Rhg8 Re5 Rh8 Re7 Rhe8 Rg7 Rg8 Rd7 ; bm hxg4;
3r4/3r4/2p1k3/p1pbPp1p/Pp1p1PRP/1P1P4/2P4R/2K1Q3 b - - acd 45; ce -731; acs 228; acn 2589000; pv hxg4 h5 Rh8 Qh4 Rf7 Qg5 Kd7 h6 Kc7 Qg6 Rfh7 Rh5 Kb6 e6 g3 Qxg3 Bxe6 Qg5 Bd5 Rh3 Rg8 Qf6 Rgh8 Kb1 Re8 Qg6 Reh8 Kb2 Kb7 Qd6 Kb6 Rh5 Ka6 Rxf5 Rxh6 Qxc5 R8h7 Re5 Rb7 f5 Rhh7 Re8 Rhc7 Rd8 Rh7 Rf8 Ra7 Rb8 Rab7 Rd8 Rbd7 Re8 Rhf7 Qxd4 Rfe7 Ra8+ Ra7 f6 ; bm hxg4;
3r4/3r4/2p1k3/p1pbPp1p/Pp1p1PRP/1P1P4/2P4R/2K1Q3 b - - acd 46; ce -721; acs 244; acn 2770000; pv hxg4 h5 Rh8 Qh4 Rf7 Qg5 Kd7 Qg6 Kc7 h6 Rfh7 Rh5 Kb6 e6 g3 Qxg3 Bxe6 Qg5 Bd5 Rh3 Rg8 Qf6 Rgh8 Kb2 Ka6 Qd6 Kb6 Rh5 Ka6 Kc1 Kb6 Kb1 Ka6 Kb2 Kb6 Qf6 Ka6 Kc1 Bf3 Rh3 Bg2 Rg3 Rxh6 Qxf5 Rh1+ Kb2 Rg1 Qxc5 Rhh1 Qc4+ Kb6 Qxd4+ Ka6 Rg7 Rb1+ Ka2 Ra1+ Qxa1 Rxa1+ Kxa1 Bf3 f5 ; bm hxg4;
3r4/3r4/2p1k3/p1pbPp1p/Pp1p1PRP/1P1P4/2P4R/2K1Q3 b - - acd 47; ce -731; acs 289; acn 3277000; pv hxg4 h5 Rh8 Qh4 Rf7 Qg5 Kd7 Qg6 Kc7 h6 Rfh7 Rh5 Kb6 e6 g3 Qxg3 Bxe6 Qg5 Bd5 Rh3 Rg8 Qf6 Rgh8 Kb2 Ka6 Qd6 Kb6 Rh5 Ka6 Qxc5 Rxh6 Rxf5 R8h7 Rg5 Rb7 Re5 Rf7 Re8 Rhh7 f5 Rb7 Ra8+ Ra7 Rf8 Rhc7 Rb8 Rab7 Rh8 Ra7 Rf8 Rh7 Rf6 Kb7 Rd6 Rc7 Rd8 Bf7 Rh8 Bd5 Re8 Bf7 Re5 Bd5 ; bm hxg4;
3r4/3r4/2p1k3/p1pbPp1p/Pp1p1PRP/1P1P4/2P4R/2K1Q3 b - - acd 48; ce -954; acs 3600; acn 43701000; pv hxg4 h5 Rh7 Qh4 Kd7 e6+ Bxe6 Re2 Rdh8 Qf6 Bd5 Qxf5+ Kc7 Qxg4 Kb6 f5 Rxh5 Re7 Rh1+ Kb2 R1h7 f6 Rxe7 fxe7 Re8 Qd7 Bf7 Qd8+ Kb7 Qxa5 Rxe7 Qd8 Rc7 a5 Bd5 a6+ Kxa6 Qxc7 Bh1 Qg7 Kb6 Qf8 Kb5 Qb8+ Ka6 Qc7 Bd5 Qc8+ Ka7 Qd8 Ka6 Qf8 Kb5 Qd6 Kb6 Qb8+ Ka5 Qb7 Bf3 Qd7 Kb6 Qd8+ Kb5 Qb8+ Ka6 Qf8 ; bm hxg4;
3r4/3r4/2p1k3/p1pbPp1p/Pp1p1PRP/1P1P4/2P4R/2K1Q3 b - - acd 49; ce -1035; acs 9780; acn 121475000; pv hxg4 h5 Rh7 Qh4 Kd7 e6+ Bxe6 Re2 Re8 Re5 Kd6 Kb2 Rh6 Qg5 Reh8 Kc1 R6h7 Qf6 Re8 h6 g3 Rxe6+ Rxe6 Qd8+ Rd7 Qb8+ Ke7 h7 Rd8 Qc7+ Rd7 Qxd7+ Kxd7 h8=Q Kc7 Qh7+ Kd6 Qg7 Re1+ Kb2 Re3 Qh6+ Kc7 Qh7+ Kb6 Qxf5 Re2 Qc8 g2 Qb8+ Ka6 Qg8 Kb6 Qg3 Kc7 f5+ Kd7 Qg4 Kd8 f6 Rf2 Qg7 c4 bxc4 c5 Qg8+ Kd7 f7 g1=Q Qxg1 Rxf7 Qg5 Ke6 Qd5+ Kf6 Qxc5 Rh7 Qxd4+ Kg6 Qb6+ Kg7 Qxa5 Rh8 Qd5 Kh7 Qf7+ Kh6 ; bm hxg4;
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mwyoung
Posts: 2727
Joined: Wed May 12, 2010 10:00 pm

Re: An apparent fortress, but there is a move that looks like it wins.

Post by mwyoung »

Lc0 agrees that Rxg4 is the best move. It finds it at depth 12 and stays with the Rxg4 move.


3r4/3r4/2p1k3/p1pbPp1p/Pp1p1PpP/1P1P2R1/2P4R/2K1Q3 w - - 0 1

Analysis by Lc0 v0.21.1:

1.Rxg4 hxg4 2.h5 Rh8 3.Qh4 Rf7 4.Qg5 Kd7 5.Kb2 Kc7 6.h6 Kb6 7.Re2 Be6 8.Qg6 Re7 9.Rh2 Bd5 10.h7 Kb7 11.e6 Kb6 12.Qf6 g3 13.Qxh8 gxh2 14.Qd8+ Rc7 15.h8Q h1Q 16.Qxh1 Bxh1 17.e7 Ka6 18.Qxc7 Bd5
White is clearly winning: +- (11.57) Depth: 12/39 00:03:43 17896kN
"The worst thing that can happen to a forum is a running wild attacking moderator(HGM) who is not corrected by the community." - Ed Schröder
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Father
Posts: 1391
Joined: Sun Mar 19, 2006 4:39 am
Location: Colombia
Full name: Pablo Ignacio Restrepo

Re: An apparent fortress, but there is a move that looks like it wins.

Post by Father »

Good morning Acase,
Good position an example!!.
A test for all computers: Your same post example, but change the two black rooks to g8 and g7.
I would like to know what computers can do!!
Thanks in advance,
Pablo
I am thinking chess is in a coin.Human beings for ever playing in one face.Now I am playing in the other face:"Antichess". Computers are as a fortres where owner forgot to close a little door behind. You must enter across this door.Forget the front.
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peter
Posts: 3186
Joined: Sat Feb 16, 2008 7:38 am
Full name: Peter Martan

Re: An apparent fortress, but there is a move that looks like it wins.

Post by peter »

acase wrote: ↑Fri Apr 26, 2019 3:17 am Here is the position, admittedly I borrowed and modified the end position from Walter Eigenmann's ERET 075:

[d]3r4/3r4/2p1k3/p1pbPp1p/Pp1p1PpP/1P1P2R1/2P4R/2K1Q3 w - - 0 6

The correct move that looks like it "breaks through" is 1.Rxg4!
Very well done!

Tactical code in SF like e.g. in Thothfish solves at once, internal MV- Mode like in McCain (X2b, Tactical 5=MV32) takes about a quarter of an hour at 24 threads (12x3GHz, 32Gb Hash):

Code: Select all

0.00: +5.53/3 6.Kb2 c4 7.dxc4
0.00: +5.11/4 6.Kb1 Rc8 7.Re2 Bf3
0.00: +5.01/5 6.Re2 Rb8 7.Rd2 Kf7 8.Kb2
0.00: +4.96/6 6.Re2 Re7 7.Qd2 Kf7 8.Kb2 Kg7 9.Re1
0.00: +4.98/7 6.Kb2 Re8 7.Rf2 Ree7 8.Rg1 Kf7 9.Qd2
0.00: +4.96/8 6.Qd2 Kf7 7.Kb2 Kg7 8.Rg1 Kg8 9.Re2 Kg7
0.00: +4.96/9 6.Rg1 Re7 7.Kb2 Kd7 8.Qd2 Kc7 9.Re2 Rdd7 10.Rge1
0.00: +4.94/10 6.Kb1 Re8 7.Rg1 Ke7 8.Qd2 Kd8 9.Re2 Kc7 10.Kb2 Kd8
0.00: +4.94/11 6.Rf2 Re7 7.Rg1 Kd7 8.Qd2 Kc7 9.Kb2 Rdd7 10.Rd1 Re8 11.Rff1
0.00: +4.93/12 6.Rf2 Re7 7.Rg1 Kd7 8.Qd2 Kc7 9.Kb2 Kb6 10.Rc1 Rdd7 11.Rd1 Kc7 12.Rff1 Kb7 13.Rc1 Kc7
0.00: +4.90/13 6.Kd1 Rc7 7.Rg1 Re7 8.Ke2 Kd7 9.Kf2 Kc7 10.Kg3 Kb6 11.Qd2 Rdd7 12.Re2 Kb7
0.00: +4.91/14 6.Kd1 Re7 7.Ke2 Kd7 8.Rg1 Kc7 9.Kf2 Kb6 10.Kg3 Kb7 11.Qd2 Kc7 12.Rf2 Kb7 13.Re2 Kb6 14.Kf2
0.00: +4.88/15 6.Kd1 Re7 7.Ke2 Kd7 8.Kf2 Kc7 9.Rg1 Kb7 10.Kg3 Kb6 11.Qd2 Rdd7 12.Rf1 Kb7 13.Re2 Kc7
0.00: +4.87/16 6.Kd1 Re7 7.Ke2 Kd7 8.Kf2 Kc7 9.Rg1 Kb6 10.Qe2 Kc7 11.Qd2 Kb7 12.Rb1 Kb6 13.Kg1 Rdd7
0.01: +4.87/17 6.Kd1 Re7 7.Ke2 Kd7 8.Kf1 Kc7 9.Kf2 Kb7 10.Qd1 Kc7 11.Qd2 Kb6 12.Rg1 Rdd7 13.Rb1 Kb7 14.Kg1
0.02: +4.88/18 6.Re2 Re7 7.Kd2 Kd7 8.Rf2 Kc7 9.Rf1 Kb6 10.Ke2 Kb7 11.Qd2 Kc7 12.Ke1 Re6 13.Kf2 Re7 14.Ke2 Kb6 15.Rc1
0.03: +4.88/19 6.Re2 Re7 7.Kd2 Kd7 8.Rh2 Rf8 9.Rf2 Kc7 10.Kc1 Rd8 11.Qd2 Rdd7 12.Rf1 Kb7 13.Kd1 Rd8 14.Ke2 Kc7 15.Qe1 Kb6
0.03: +4.87/20 6.Re2 Re7 7.Kd2 Kd7 8.Rh2 Ke6 9.Rf2 Kd7 10.Rf1 Kc7 11.Kd1 Kb6 12.Ke2 Kb7 13.Rf2 Kc7 14.Qd2 Kb7 15.Kf1 Re6
0.03: +4.87/20 6.Kd1 Re7 7.Kd2 Kd7 8.Ke2 Kc7 9.Rf2 Kb6 10.Qd2 Kb7 11.Rf1 Kc7 12.Kf2 Rdd7 13.Rgg1 Kb6 14.Kg3 Kb7 15.Ra1 Kc7
0.05: +4.88/20 6.Rd2 Re7 7.Kb2 Kd7 8.Rh2 Ree8 9.Qd2 Kc7 10.Rf2 Kb6 11.Kc1 Re7 12.Kd1 Kc7 13.Rf1 Kb7 14.Ke2 Kc7 15.Kf2 Rdd7
0.09: +4.87/21 6.Rd2 Re7 7.Kd1 Kd7 8.Rf2 Kc7 9.Rf1 Kb6 10.Ke2 Kb7 11.Qd2 Kc7 12.Rf2 Kb6 13.Kd1 Kc7 14.Kc1 Kb6 15.Rf1 Kc7 16.Kb1 Kb6 17.Qe1 Kc7
0.12: +4.87/22 6.Rd2 Re7 7.Kd1 Kd7 8.Ke2 Kc7 9.Rg1 Rf7 10.Kf2 Kb6 11.Kf1 Re7 12.Rf2 Kc7 13.Rg3 Kb7 14.Rd2 Rdd7 15.Rh2 Kb6 16.Ke2 Rd8 17.Kf2
0.17: +4.84/23 6.Rd2 Re7 7.Kd1 Kd7 8.Ke2 Kc7 9.Kf2 Kb7 10.Kf1 Kc7 11.Rf2 Kb7 12.Ke2 Kc7 13.Rf1 Kb7 14.Kd1 Kc7 15.Qd2 Kb7 16.Rf2 Kb6 17.Qe1 Kc7
0.25: +4.84/24 6.Rd2 Re7 7.Kd1 Kd7 8.Ke2 Kc7 9.Kf2 Kb7 10.Kf1 Kb6 11.Rh2 Kc7 12.Kf2 Kb7 13.Rg1 Kc7 14.Ke2 Rh8 15.Qd2 Rd8 16.Rg3 Kb6 17.Kf2 Kb7
0.36: +4.84/25 6.Rd2 Re7 7.Rf2 Kd7 8.Kb1 Kc8 9.Qd2 Kb7 10.Rg1 Kc7 11.Qe1 Kd7 12.Kb2 Kc7 13.Rff1 Kb7 14.Rg3 Kb6 15.Rf2 Kc7 16.Rd2 Kd7 17.Rg1 Kc7 18.Kb1 Kb7 19.Rg3
0.58: +4.84/26 6.Rd2 Re7 7.Rf2 Kd7 8.Kb1 Kc8 9.Rf1 Kc7 10.Kc1 Kb7 11.Kd1 Kb6 12.Ke2 Kc7 13.Kd2 Kb6 14.Rf2 Kc7 15.Kd1 Kb6 16.Ke2 Kc7 17.Rf1 Kb7 18.Qd2 Kb6 19.Rf2 Kb7
1.19: +4.84/27 6.Rd2 Re7 7.Rf2 Kd7 8.Rg1 Kc7 9.Kb1 Kb6 10.Rff1 Kc7 11.Qe2 Kb6 12.Qd2 Rg8 13.Kb2 Rd8 14.Rf2 Rdd7 15.Rg3 Rd8 16.Kc1 Kb7 17.Qe1 Kc7 18.Rh2 Kb7 19.Rd2
1.19: +4.84/28 6.Rd2 Re7 7.Rf2 Kd7 8.Rg1 Kc7 9.Kb1 Kb6 10.Qd2 Kb7 11.Rgf1 Be6 12.Kb2 Kc7 13.Re2 Bd5 14.Rh2 Rdd7 15.Qe1 Kb6 16.Rg1 Rd8 17.Rg3 Kc7 18.Rf2 Kb6 19.Rd2 Kc7
1.35: +4.90/28 6.Qf1 Re7 7.Kd2 Kd7 8.Ke2 Kc7 9.Rg1 Kb7 10.Kf2 Kb6 11.Qe1 Kc7 12.Kg3 Rdd7 13.Qd2 Rd8 14.Rf2 Kb6 15.Rff1 Rdd7 16.Rd1 Kb7 17.Rgf1 Rd8 18.Qf2 Rdd7 19.Ra1 Kc7
2.13: +4.90/29 6.Qf1 Re7 7.Kd2 Kd7 8.Ke2 Kc7 9.Rg1 Kb7 10.Kf2 Kb6 11.Qe1 Kc7 12.Kg3 Rdd7 13.Qd2 Rd8 14.Rf2 Kb6 15.Rgf1 Kc7 16.Re2 Kb7 17.Ree1 Kb6 18.Rg1 Kc7 19.Ref1 Kb6 20.Qe1
3.25: +4.90/30 6.Qf1 Re7 7.Kd2 Kd7 8.Ke2 Kc7 9.Rg1 Kb7 10.Kf2 Kb6 11.Qe1 Kc7 12.Kg3 Rdd7 13.Rf1 Rd8 14.Rhf2 Kb6 15.Qd2 Kb7 16.Rd1 Kc7 17.Rff1 Kb6 18.Qe1 Kb7 19.Rg1 Kb6o 20.Kf2 Rdd7
4.52: +4.90/31 6.Qf1 Re7 7.Kod2 Kd7 8.Ke2 Kc7 9.Rg1 Kb7 10.Kf2 Kb6 11.Qe1 Kc7 12.Kg3 Rdd7 13.Rf1 Rd8 14.Rhf2 Kb6 15.Qd2 Kb7 16.Rd1 Kc7 17.Rg1 Kb6 18.Qe2 Kc7 19.Qe1 Rdd7 20.Qd2 Rd8 21.Rff1
6.10: +4.90/32 6.Qf1 Re7 7.Kd2 Kd7 8.Ke2 Kc7 9.Rg1 Kb7 10.Kf2 Kb6 11.Qe1 Kc7 12.Kg3 Rdd7 13.Rf1 Rd8 14.Rhf2 Kb6 15.Qd2 Kb7 16.Rd1 Kc7 17.Qe1 Kb6 18.Rf1 Kc7 19.Qf2 Kb6 20.Rde1 Rf8 21.Qd2 Rd8
9.43: +4.90/33 6.Qf1 Re7 7.Kd2 Kd7 8.Ke2 Kc7 9.Rg1 Kb7 10.Kf2 Kb6 11.Qe1 Kc7 12.Ke2 Bf3+ 13.Kd2 Bd5 14.Rf2 Kb6 15.Rff1 Kb7 16.Ke2 Kb6 17.Qd2 Kc7 18.Rg3 Kb6 19.Kf2 Kb7 20.Rgg1 Kb6 21.Re1 Kc7 22.Rd1 Kb6
13.20: +4.90/34 6.Qf1 Re7 7.Kd2 Kd7 8.Ke2 Kc7 9.Rg1 Kb7 10.Kf2 Kb6 11.Qe1 Kc7 12.Kg3 Rdd7 13.Rf1 Rd8 14.Re2 Re6 15.Ref2 Kb7 16.Qe2 Re7 17.Qd2 Re6 18.Qe1 Kc7 19.Re2 Rd7 20.Qd2 Kb7 21.Rfe1 Rd8 22.Rh2 Rd7
16.07: +5.17/35 6.Rxg4 hxg4 7.h5 Rh8 8.Qh4 Rf7 9.Qg5 Kd7 10.h6 Kc7 11.Re2 Be6 12.Qg6 Re7 13.Rh2 Kb6 14.Kb2 Rhh7 15.Rh5 Kb7 16.Rg5 Rhf7 17.Qg8 Bd5 18.Qd8 Rc7 19.Kc1 Ka7 20.Rg8 Ka6 21.Qb8 Rb7 22.Qa8+ Ra7 23.Qc8+ Kb6 24.Qb8+ Rab7 25.Qd8+ Ka6 26.Rg5 Rfe7 27.Rg6 Bf3 28.Qc8
Peter.
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peter
Posts: 3186
Joined: Sat Feb 16, 2008 7:38 am
Full name: Peter Martan

Re: An apparent fortress, but there is a move that looks like it wins.

Post by peter »

peter wrote: ↑Fri Apr 26, 2019 7:25 pm Tactical code in SF like e.g. in Thothfish solves at once, internal MV- Mode like in McCain (X2b, Tactical 5=MV32) takes about a quarter of an hour
Here's a Cfish- branch that has both (from "Alexej" at Zerbinati- Forum)

ICCF5=internal MV32, everything else default except Syzygys off.
7' depth 33

3r4/3r4/2p1k3/p1pbPp1p/Pp1p1PpP/1P1P2R1/2P4R/2K1Q3 w - - 0 1

Analysis by CF OPT 180419 x64 POP NUMA:

Code: Select all

6.Rd2 Kf7 7.Kb2 Re8 8.Re2 Kg7 9.Qd2 
  +-  (7.51)   Depth: 7/6   00:00:17  213kN
...
6.Kd1 Re7 7.Ke2 Kf7 8.Kf2 Kg7 9.Rg1 Bf3 10.Qd2 Rdd7 11.Kg3 Kf8 12.Qe1 Bd5 13.Kf2 Kg8 14.Qd2 Kg7 15.Kg3 Rd8 
  +-  (7.47)   Depth: 19/21   00:00:19  62809kN
6.Qe2 Re7 7.Kd2 Kf7 8.Kd1 Rdd7 9.Qe1 Rd8 10.Ke2 Kg7 11.Rg1 Bf3+ 12.Kf2 Rdd7 13.Qd2 Kf7 14.Kf1 Kg7 15.Ke1 Re8 16.Rg3 
  +-  (7.46)   Depth: 20/21   00:00:20  79473kN
...
6.Qe2 Re7 7.Kd2 Kf7 8.Kd1 Rdd7 9.Qe1 Rd8 10.Ke2 Kg7 11.Kf1 Kf7 12.Rg1 Kg7 13.Qd2 Rdd7 14.Kf2 Rd8 15.Ke2 Bf3+ 16.Kf1 Bd5 17.Kf2 Rdd7 18.Kg3 Re6 19.Qf2 Kf7 20.Qe1 Kg6 21.Kf2 Rde7 22.Qd2 
  +-  (7.46)   Depth: 33/32   00:06:51  10435MN
...
6.Qe2 Re7 7.Kd2 Kf7 8.Kd1 Rdd7 9.Qe1 Rd8 10.Ke2 Kg7 11.Kf1 Kf7 12.Rg1 Kg7 13.Qd2 Rdd7 14.Kf2 Rd8 15.Ke2 Bf3+ 16.Kf1 Bd5 17.Kf2 Rdd7 18.Kg3 Re6 19.Qf2 Kf7 20.Qe1 Kg6 21.Kf2 Rde7 22.Qd2 
  +-  (7.46)   Depth: 33/32   00:06:51  10447MN
6.Rxg4 hxg4 7.h5 Rh7 8.Qh4 Kd7 9.e6+ Bxe6 10.Re2 Rdh8 11.Qf6 Bd5 12.Qxf5+ Kc7 13.Qxg4 Kb6 14.Re5 Bf7 15.Qf5 Bd5 16.Qg6 Ka6 17.Rxd5 Rh6 18.Rxc5 Rxg6 19.hxg6 Kb6 20.Rg5 Kc7 21.f5 Kd6 22.f6 Ke6 23.Rf5 Kxf5 24.g7 Rh1+ 25.Kb2 Rg1 26.f7 
  +-  (7.47)   Depth: 33/50   00:06:53  10503MN
...
6.Rxg4 hxg4 7.h5 Rh7 8.Qh4 Kd7 9.e6+ Bxe6 10.Re2 Rdh8 11.Qf6 Bd5 12.Qxf5+ Kc7 13.Qxg4 Kb6 14.Re5 Bf7 15.Qf5 Bd5 16.Qg6 Ka6 17.Rxd5 Rh6 18.Rxc5 Rxg6 19.hxg6 Kb6 20.Rg5 Kc7 21.f5 Kd6 22.f6 Ke6 23.Rf5 Kxf5 24.g7 Rh1+ 25.Kb2 Rg1 26.f7 
  +-  (7.47)   Depth: 33/50   00:08:03  12374MN
"MagicTacticSolver" on, everything else default, 17" depth 19:

3r4/3r4/2p1k3/p1pbPp1p/Pp1p1PpP/1P1P2R1/2P4R/2K1Q3 w - - 0 1

Analysis by CF OPT 180419 x64 POP NUMA:

Code: Select all

6.Kb1 Bf3 7.Qf1 Ke7 8.Kc1 Ra7 
  +-  (9.83)   Depth: 7/6   00:00:17  31kN
...
6.Rg1 Bf3 7.Qf2 Ke7 8.Qxf3 Rc7 9.Rg3 Rcc8 10.Qe4 Rf8 11.Qe2 Rf7 12.Kd1 Rg7 13.Ke1 Rf8 14.Kf1 Rg6 15.Rh1 Rh6 16.Kg2 Rg6 17.Kh2 
  +/-  (0.83)   Depth: 18/31   00:00:17  3742kN
6.Rxg4 hxg4 7.h5 Rh7 8.h6 Bf3 9.Qh4 Rf8 10.Qg5 Rfh8 11.Qf6+ Kd7 12.Rh4 Kc7 
  +-  (2.24)   Depth: 19/31   00:00:17  8729kN
...
6.Rxg4 hxg4 7.h5 Rh7 8.h6 Kd7 9.Rh5 Be6 10.Rg5 c4 11.Rg6 c3 12.Qg1 Re8 13.Rg7+ Re7 14.Qh2 Rxh6 15.Rxe7+ Kxe7 16.Qxh6 Kd7 17.Qf6 
  +-  (10.70)   Depth: 21/31   00:00:17  19458kN
...
6.Rxg4 hxg4 7.h5 Rh7 8.Qh4 Kd7 9.e6+ Kc7 10.Re2 Re8 11.Re5 g3 12.Qf6 g2 13.Qf7+ Re7 14.Kb2 Bf3 15.h6 Bg4 16.Qf8 Kb6 17.Qd8+ Rc7 18.Qb8+ Ka6 19.Qa8+ Kb6 
  =  (0.00)   Depth: 23/45   00:00:22  129MN
...
6.Rxg4 hxg4 7.h5 Rh7 8.h6 Rdh8 9.Qh4 Kd7 10.e6+ Kc7 11.Re2 g3 12.Qxg3 Kd6 13.Qg6 Ke7 14.Re5 
  +-  (3.95)   Depth: 24/45   00:00:23  147MN
...
6.Rxg4 hxg4 7.h5 Rh7 8.h6 Rdh8 9.Qh4 Kd7 10.e6+ Kd6 11.Qf6 Kc7 12.Rh5 g3 13.Rg5 Kb6 14.Rxg3 Rxh6 15.Rg6 Rxg6 16.e7 Rgh6 17.e8R Rxe8 18.Qxh6 Re1+ 19.Kd2 Rd1+ 20.Kxd1 Bf3+ 21.Ke1 Bg4 
  +/-  (1.10)   Depth: 25/45   00:00:26  201MN
...
6.Rxg4 hxg4 7.h5 Rh7 8.h6 Rdh8 9.Qh4 Kd7 10.e6+ Kc7 11.Re2 g3 12.Qxg3 Re8 13.Re5 Kd6 14.Qg6 Rhe7 15.Qf6 Rh7 16.Re1 
  +-  (6.69)   Depth: 26/42   00:00:26  220MN
...
6.Rxg4 hxg4 7.h5 Rh7 8.h6 Bf3 9.Rh5 Rdh8 10.Qh4 Kd7 11.Qf6 g3 12.Rg5 Kc7 13.Rg7+ Kb6 14.Qf7 Rxg7 15.hxg7 Rc8 16.Qxf5 Rg8 17.Qh7 g2 18.Qxg8 g1R+ 19.Kb2 Bh5 20.Qd8+ Ka6 21.g8R Rxg8 22.Qxg8 Kb6 23.Qd8+ Ka6 24.Kc1 
  +-  (9.12)   Depth: 27/48   00:00:37  457MN
...
6.Rxg4 hxg4 7.h5 Rh7 8.Qh4 Rdh8 9.h6 Kd7 10.e6+ Kxe6 11.Re2+ Kd7 12.Qg5 Kc7 13.Re7+ Kb6 14.Rxh7 Rxh7 15.Qg6 Bg8 16.Qxg8 Rxh6 17.Qd8+ Ka6 18.Qf8 Rh7 19.Qxc5 Rh1+ 20.Kd2 Rh2+ 21.Kd1 Rf2 22.Qxc6+ Ka7 23.Qc5+ Ka6 24.Qe5 g3 25.Qf6+ Kb7 26.Qg7+ Kc6 27.Qxg3 Rf1+ 28.Ke2 Rc1 29.Qg2+ Kc7 30.Qg7+ Kb6 
  +-  (4.72)   Depth: 28/53   00:00:56  873MN
...
6.Rxg4 hxg4 7.h5 Rh7 8.h6 Rdh8 9.Qh4 Kd7 10.e6+ Kxe6 11.Re2+ Kd6 12.Qg5 Kd7 13.Re5 Kc7 14.Re7+ Kb6 15.Rxh7 Rxh7 16.Qg6 Bg8 17.Qxg8 Rxh6 18.Qd8+ Ka6 19.Qf8 Rh1+ 20.Kd2 Rh2+ 21.Ke1 Kb7 22.Qe7+ Kb6 23.Qd8+ Kb7 24.Qd7+ Kb6 25.Qc8 Rg2 26.Qb8+ Ka6 27.Qc7 
  +-  (6.95)   Depth: 29/49   00:01:04  1047MN
...
6.Rxg4 hxg4 7.h5 Rh7 8.Qh4 Kd7 9.e6+ Bxe6 10.Qf6 Rf7 11.Qg6 Rh8 12.h6 Rhh7 13.Re2 Bd5 14.Re5 Kc7 15.Qg8 Kb7 16.Qd8 g3 17.Qxa5 Bg2 18.Qxc5 Bf3 19.Kb2 g2 20.Qxb4+ Ka8 21.Ra5+ Ra7 22.Qf8+ Kb7 23.Qg7+ Kb6 
  +-  (5.66)   Depth: 30/56   00:01:39  1844MN
...
6.Rxg4 hxg4 7.h5 Rh7 8.Qh4 Kd7 9.e6+ Kc7 10.Re2 Re8 11.Qg5 Kb6 12.h6 Rxe6 13.Rxe6 Bxe6 14.Qg6 Rh8 15.Qg7 Rg8 16.Qe5 Ra8 17.h7 g3 18.Qg7 Rd8 19.Qxg3 c4 20.Qg5 Rh8 21.bxc4 c5 22.Qe7 Kc6 23.Qxe6+ Kb7 24.Qe7+ Ka8 25.Qxc5 Kb7 
  +-  (7.68)   Depth: 31/67   00:02:30  2975MN
Same 12x3GHz CPU, 24 threads with 32Gb Hash like in posting before.
Peter.
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Paloma
Posts: 1167
Joined: Thu Dec 25, 2008 9:07 pm
Full name: Herbert L

Re: An apparent fortress, but there is a move that looks like it wins.

Post by Paloma »

Where can I get this cfish, i mean the exe, not the source
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peter
Posts: 3186
Joined: Sat Feb 16, 2008 7:38 am
Full name: Peter Martan

Re: An apparent fortress, but there is a move that looks like it wins.

Post by peter »

peter wrote: ↑Fri Apr 26, 2019 8:56 pm Same 12x3GHz CPU, 24 threads with 32Gb hash
komodo 12.3 with this hardware and default parameters except Syzygys switched off, 35' depth 60:

3r4/3r4/2p1k3/p1pbPp1p/Pp1p1PpP/1P1P2R1/2P4R/2K1Q3 w - - 0 1

Analysis by Komodo 12.3 64-bit:

Code: Select all

6.Kb2 Rf7 7.Rg1 
  +-  (6.87 ++)   Depth: 7   00:00:00  1180kN
...
6.Kb2 Rg8 7.Rg1 Re7 8.Qg3 Kd7 9.Rf2 Kc7 10.Rff1 Ree8 11.Re1 Re6 12.Rd1 Bf3 13.Rde1 
  +-  (6.68)   Depth: 14   00:00:00  2579kN
6.Re2 Rg8 7.Kb2 Re7 8.Rg1 Bf3 9.Rf2 Ree8 10.Rff1 Kd7 11.Qg3 Bd5 12.Re1 Kc7 13.Rgf1 
  +-  (6.73)   Depth: 14   00:00:00  2665kN
...
6.Re2 Re7 7.Kb2 Rf8 8.Rg1 Bf3 9.Rd2 Rfe8 10.Rf1 Bd5 11.Re2 Rf8 12.Qd2 Ref7 13.Rg1 Rd7 14.Rg3 Rg8 15.Qe1 Rf8 16.Rf2 Re7 17.Qf1 Rg8 18.Rh2 Rd7 19.Qf2 Rgd8 20.Qd2 Re7 21.Rg1 Bf3 22.Re1 Rf8 23.Qf2 Rd7 24.Qg3 Rg8 25.Rg1 Rdd8 26.Rf1 Bd5 27.Re1 Rge8 28.Rf2 Rg8 29.Ree2 Rd7 30.Rd2 Rg6 31.Rf1 Rg8 32.Re2 Re7 33.Rb1 Ree8 34.Rbe1 Bf3 35.Rf2 Bd5 36.Rff1 Ref8 
  +-  (6.68)   Depth: 60   00:21:16  31851MN
6.Rxg4 hxg4 7.h5 
  +-  (6.74 ++)   Depth: 60   00:35:23  52996MN
6.Rxg4 hxg4 7.h5 
  +-  (6.82 ++)   Depth: 60   00:45:03  67183MN
6.Rxg4 hxg4 7.h5 
  +-  (6.93 ++)   Depth: 60   00:50:16  75254MN
Switched off after more than another one full hour wating for next output line.
Fail high needs very much time to be solved obviously.
Peter.
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peter
Posts: 3186
Joined: Sat Feb 16, 2008 7:38 am
Full name: Peter Martan

Re: An apparent fortress, but there is a move that looks like it wins.

Post by peter »

peter wrote: ↑Sat Apr 27, 2019 12:05 am Switched off after more than another one full hour wating for next output line.
Fail high needs very much time to be solved obviously.
Same Cfish as in posting above but one, with this hardware and now default settings, which includes Analysis Contempt Both 25, just Syzygys switched off again.

19' depth 57:

3r4/3r4/2p1k3/p1pbPp1p/Pp1p1PpP/1P1P2R1/2P4R/2K1Q3 w - - 0 1

Analysis by CF OPT 180419 x64 POP NUMA:

Code: Select all

6.Re2 Re8 7.Kb2 Kf7 8.Qd2 Kg7 9.Re1 
  +-  (7.49)   Depth: 7/7   00:00:17  19kN
...
6.Qd2 Re8 7.Kd1 Ke7 8.Ke1 Kd8 9.Kf2 Kc7 10.Rg1 Kb8 11.Re1 Kb7 12.Kg3 Bf3 13.Rc1 Bd5 14.Re2 
  +-  (7.48)   Depth: 16/16   00:00:17  1083kN
6.Kd2 Re8 7.Rg1 Rg7 8.Ke2 Reg8 9.Kf1 Re7 10.Kf2 Kf7 11.Qc1 Bf3 12.Qd2 Rge8 13.Kg3 Kg7 14.Rc1 
  +-  (7.49)   Depth: 17/20   00:00:17  2076kN
...
6.Kd2 Re8 7.Kd1 Rg7 8.Qd2 Reg8 9.Ke2 Rd8 10.Kf1 Re7 11.Rg1 Kf7 12.Kf2 Ree8 13.Kg3 Re6 14.Re2 Ke7 15.Ree1 Rg8 16.Kf2 Kd7 17.Rc1 Kc8 18.Rcf1 Kb7 19.Re1 Rge8 20.Kg3 Rf8 21.Rc1 Rfe8 22.Rge1 R8e7 23.Re2 Kc8 24.Rg1 Kb7 25.Rf1 Rd7 26.Rfe1 Kc8 27.Rf2 Rc7 28.Rg1 Rb7 29.Rh2 Rd7 30.Qe2 Kb7 31.Re1 Kc7 32.Qd2 Kb7 33.Rc1 Rde7 34.Rf2 
  +-  (7.46)   Depth: 56/55   00:08:36  12382MN
6.Rxg4 
  +-  (7.55 ++)   Depth: 57/74   00:18:54  27967MN
6.Rxg4 
  +-  (7.65 ++)   Depth: 57/74   00:23:23  34914MN
6.Rxg4 
  +-  (7.79 ++)   Depth: 57/74   00:27:33  41439MN
6.Rxg4 
  +-  (7.99 ++)   Depth: 57/74   00:31:55  48336MN
6.Rxg4 
  +-  (8.25 ++)   Depth: 57/74   00:36:47  56049MN
6.Rxg4 
  +-  (8.61 ++)   Depth: 57/74   00:44:17  68126MN
6.Rxg4 
+-  (9.08 ++)    Depth: 57/74   00:58:16  90688MN
Again switched off after more than an hour of not solving fail high.
Last edited by peter on Sat Apr 27, 2019 1:17 am, edited 1 time in total.
Peter.
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peter
Posts: 3186
Joined: Sat Feb 16, 2008 7:38 am
Full name: Peter Martan

Re: An apparent fortress, but there is a move that looks like it wins.

Post by peter »

Paloma wrote: ↑Sat Apr 27, 2019 12:03 am Where can I get this cfish, i mean the exe, not the source
At Zerbinati- Forum.
Peter.
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