Cfish-54302a... Search of startpos to depth 50

[Dann Corbit]

SMP 20 thread:

Code: Select all

[Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "*"]
[ECO "D35"]
[Variation "QGD"]

1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. cxd5 exd5 5. Bg5 c6 6. e3 Bd6 7. Bd3 O-O
8. Qc2 h6 9. Bh4 Re8 10. Nge2 Qe7 11. O-O Nbd7 12. h3 Nf8 13. Bg3 b6 14.
Rfd1 Bd7 15. Rab1 a5 16. Bxd6 Qxd6 17. Nf4 Ne6 18. Nce2 Rac8 19. Nxe6
Qxe6 20. Nf4 Qe7 21. Ba6 Rb8 22. Be2 Ne4 23. Bd3 Rbc8 24. Rbc1 Qg5 25.
a3 c5 26. Bxe4 dxe4 27. dxc5 Rxc5 28. Qd2 Rxc1 29. Qxc1 *

And with 2 threads:

Code: Select all

[Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "*"]
[ECO "B51"]
[Variation "Sicilian"]

1. e4 c5 2. Nf3 d6 3. Bb5+ Nd7 4. O-O a6 5. Bxd7+ Bxd7 6. d4 cxd4 7.
Qxd4 Nf6 8. Nc3 e6 9. Rd1 Be7 10. e5 dxe5 11. Nxe5 Bb5 12. Qxd8+ Bxd8
13. a4 Bc6 14. Nxc6 bxc6 15. Bf4 Nd5 16. Bg3 O-O 17. Bd6 Re8 18. Rab1
Nf6 19. Bc5 Bc7 20. b4 Red8 21. g3 Be5 22. Ne2 Ne4 23. Be3 Nc3 24. Nxc3
Bxc3 25. Rxd8+ Rxd8 26. Rb3 Bf6 27. Kg2 Rd1 28. b5 cxb5 29. axb5 axb5
30. Rxb5 Kf8 31. Rb7 Ke8 32. Ra7 Ra1 33. Rxa1 Bxa1 *

[zullil]

SMP 20 thread:

Code: Select all

[Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "*"]
[ECO "D35"]
[Variation "QGD"]

1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. cxd5 exd5 5. Bg5 c6 6. e3 Bd6 7. Bd3 O-O
8. Qc2 h6 9. Bh4 Re8 10. Nge2 Qe7 11. O-O Nbd7 12. h3 Nf8 13. Bg3 b6 14.
Rfd1 Bd7 15. Rab1 a5 16. Bxd6 Qxd6 17. Nf4 Ne6 18. Nce2 Rac8 19. Nxe6
Qxe6 20. Nf4 Qe7 21. Ba6 Rb8 22. Be2 Ne4 23. Bd3 Rbc8 24. Rbc1 Qg5 25.
a3 c5 26. Bxe4 dxe4 27. dxc5 Rxc5 28. Qd2 Rxc1 29. Qxc1 *

By depth 58, Cfish had switched to a French Defense. But I had lost interest and failed to save the line.

[Jouni]

I ran SFdev only 42 plies and it goes to c4:

...
1.d4 e6 2.Nf3 Nf6 3.c4 d5 4.Nc3 c6 5.cxd5 exd5 6.Bf4 Bd6 7.Bxd6 Qxd6 8.e3 0-0 9.Qc2 Nbd7 10.Bd3 b6 11.0-0 Bb7 12.Rfd1 Rfe8 13.Bf5 Rad8 14.Rac1 g6 15.Bh3 h6 16.g3 Qe7 17.Re1 Kg7 18.a3 c5 19.dxc5 bxc5 20.Nb5
= (0.08) Depth: 39/48 00:16:45 5907mN
1.c4
= (0.15 ++) Depth: 40/53 00:27:02 9554mN
1.c4 e5 2.Nc3 Nc6 3.g3 Nge7 4.Bg2 g6 5.e3 Bg7 6.Nge2 d6 7.d3 h5 8.h3 Be6 9.Bd2 Qd7 10.a3 h4 11.g4 f5 12.gxf5 gxf5 13.Qb3 0-0-0 14.Nd5 Bf7 15.Rg1 Nxd5 16.Bxd5 Rhg8 17.0-0-0 Bxd5 18.cxd5 Ne7 19.f4 Kb8 20.Kb1 c6 21.Nc3 Nxd5
= (0.12) Depth: 40/53 00:30:16 10695mN
1.c4 e5
= (0.05 --) Depth: 41/52 00:39:56 14141mN
1.c4
= (0.12 ++) Depth: 41/57 00:42:08 14922mN
1.c4
= (0.23 ++) Depth: 41/57 00:44:18 15684mN
1.c4 c5 2.Nc3 e6 3.Nf3 Nf6 4.e3 Nc6 5.d4 d5 6.cxd5 exd5 7.Bb5 cxd4 8.Nxd4 Bd7 9.Be2 Nxd4 10.exd4 Bd6 11.Bg5 0-0 12.0-0 h6 13.Bxf6 Qxf6 14.Bf3 Be6 15.Nb5 Qd8 16.Nxd6 Qxd6 17.Qd2 Rac8 18.Rac1 g5 19.g3 Rfe8 20.Rxc8 Rxc8 21.Bg2 a6 22.Re1
= (0.17) Depth: 41/57 00:54:17 19254mN
1.c4
= (0.25 ++) Depth: 42/52 01:00:10 21351mN

But of course all moves are draw in opening. Or can You prove, that 1.f3 or 1.g4 loses??

[zullil]

Or can You prove, that 1.f3 or 1.g4 loses??

I can't prove that either of these moves loses. Neither can anyone else. Not because of insufficient hardware, but because both moves draw (which I also can't prove ).

[Ovyron]

It's more interesting to ask if some black move as a reply to d4 or e4 loses, maybe f5 or g5 as a defense could be losing.

Maybe the drawline is so wide that you can play random moves for a while without problems.

[Jouni]

I ran some rapid games after 1.g4?! Most games were won by black. Probably the weakest opening move? One example

[pgn]

[White "Stockfish 230118 64 BMI2"]
[Black "Houdini 6 x64-pext"]
[Result "0-1"]

1. g4 {Both last book move
} d5 {-0.82/20 8} 2. Bg2 {-0.64/22 12} Bxg4 {-1.04/20 3} 3. c4 {-0.77/24 3} c6
{-1.08/20 4} 4. Qb3 {-0.55/24 5 (h3)} e6 {-1.10/20 5 (Nf6)} 5. Qxb7 {-0.79/25
17 (h3)} Nd7 {-0.99/22 6} 6. Nc3 {-0.74/25 12} Ne7 {-1.15/21 2} 7. cxd5 {-0.63/
21 1} exd5 {-1.16/23 6} 8. Qb4 {-0.95/24 5 (Nf3)} Be6 {-1.06/23 8 (Nf6)} 9. Nf3
{-0.87/23 3} Nf5 {-1.03/22 5} 10. Qa4 {-0.92/22 2} Bd6 {-0.91/22 8 (Rc8)} 11.
Qxc6 {-0.72/21 3} Rc8 {-1.06/22 5} 12. Qb5 {-0.80/26 13 (Qa4)} Rc5 {-1.19/21 7}
13. Qd3 {-0.90/28 23 (Qa4)} O-O {-1.18/20 8} 14. b3 {-0.81/23 2} Rc8 {-1.37/20
5} 15. Bb2 {-0.95/25 11} Ne5 {-1.12/23 16} 16. Nxe5 {-1.24/24 3} Bxe5 {-1.21/
22 3} 17. h4 {-1.33/26 9 (0-0)} Nxh4 {-1.20/21 20} 18. Bh3 {-0.86/23 3} h6 {-1.
30/21 4} 19. Kd1 {-0.94/24 4 (Bxe6)} Bxh3 {-1.55/18 3} 20. Qxh3 {-1.02/26 4}
Ng6 {-1.46/19 1} 21. Rc1 {-1.21/26 5} d4 {-1.34/24 7} 22. Na4 {-1.07/26 4 (Ne4)
} Rxc1+ {-1.56/20 3} 23. Kxc1 {-1.42/27 6} Qd5 {-1.59/23 6 (Qf6)} 24. e3 {-1.
12/26 5} Qc6+ {-2.37/21 3 (dxe3)} 25. Kb1 {-2.44/25 7} Rc8 {-2.42/23 5} 26. d3
{-2.85/29 18} Qc2+ {-2.51/23 4} 27. Ka1 {-2.92/1 0} Rd8 {-2.64/24 4} 28. Qf5 {
-2.83/30 9 (Rc1)} dxe3 {-2.68/25 6} 29. fxe3 {-3.20/28 6} Rxd3 {-2.51/24 1} 30.
Rb1 {-2.94/28 10} Rd2 {-2.51/23 0} 31. Qxc2 {-3.06/27 4} Rxc2 {-2.77/23 4} 32.
Rh1 {-3.38/30 16} Re2 {-2.85/22 5} 33. Nc3 {-3.37/26 5} Rxe3 {-2.99/23 4} 34.
Nb5 {-3.40/26 3} a6 {-3.07/23 4} 35. Bxe5 {-3.47/25 2} Nxe5 {-3.19/22 8} 36.
Nd6 {-3.40/25 5} Kh7 {-3.19/21 0 (Re2)} 37. Kb1 {-3.81/25 12} Re2 {-3.36/20 4}
38. Nf5 {-4.33/26 12} Kg6 {-3.46/21 7} 39. Rf1 {-4.20/24 4} h5 {-3.91/20 3} 40.
b4 {-4.66/24 10 (Ne7+)} f6 {-4.02/19 3 (Re4)} 41. a3 {-5.25/24 6 (Ka1)} Nc4 {
-4.61/20 4} 42. Nd4 {-5.51/23 3 (Kc1)} Nxa3+ {-5.08/18 3 (Re4)} 0-1

[/pgn]

[Ovyron]

Interestingly, in my years of chess coaching, I have found 1.g4 being very popular among my students, I wonder if it's a Mexican thing.