Lyudmil Tsvetkov wrote:Another one.
[d]r1bqkbnr/1ppp1ppp/p1n5/1B2p3/4P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 0 4
Ruy Lopez, Morphy Defence/a6
Which is the best move here?
As, according to my SF, Bc6, the Exchange Variation, is the best continuation, with Ba4 ranking many centipawns behind.
So, if I have to trust SF in the opening, I have to play Bc6 every single time.
Those positions have been analysed extensively by humans, and it is proven beyond any doubt that Ba4 is better than Bc6, much better indeed.
How do you want me to trust SF here?
I know where to trust SF: in open middlegames and endgames with abundant tactics; there the engine excels.
However, I do not trust SF in closed positions, specific theoretical endgames, as well as in a large bunch of openings.
The search depth and understanding of engines for such positions is simply too low.
[pgn][Event "Komodo 1392 vs Stockfish 280"]
[Site "Chess"]
[Date "2015.03.05"]
[Round "9.2"]
[White "Stockfish 280215 x64 8CPU"]
[Black "Komodo 1392 x64 8CPU"]
[Result "1/2-1/2"]
[Time "04"]
[TimeControl "7200+30"]
[PlyCount "111"]
[Number "18"]
[Termination "GUI TB adjudication"]
[WhiteType "program"]
[BlackType "program"]
[Variant "normal"]
{ AMD FX-8350 }
1.e4 {[%eval 0,1] [%emt 00:00:00]} e5 {[%eval 0,1] [%emt 00:00:00]}
2.Nf3 {[%eval 22,31] [%emt 00:02:57]} Nc6 {(Nc6) [%eval -14,24] [%emt 00:01:50]}
3.Bb5 {(Bc4) [%eval 25,33] [%emt 00:02:05]} a6 {(a6) [%eval -17,28] [%emt 00:04:41]}
4.Bxc6 {(Ba4) [%eval 23,34] [%emt 00:02:16]} dxc6 {(dxc6) [%eval -14,28] [%emt 00:02:15]}
5.O-O {(O-O) [%eval 20,34] [%emt 00:02:34]} Be6 {(Be6) [%eval -13,30] [%emt 00:03:53]}
6.c3 {(d4) [%eval 23,34] [%emt 00:06:20]} Qd3 {(Nf6) [%eval -1,30] [%emt 00:04:03]}
7.Nxe5 {(Nxe5) [%eval 4,33] [%emt 00:02:29]} Qxe4 {(Qxe4) [%eval 2,28] [%emt 00:01:35]}
8.d4 {(d4) [%eval 2,33] [%emt 00:03:37]} O-O-O {(Qf5) [%eval 1,29] [%emt 00:03:29]}
9.Nd2 {(Nd2) [%eval 19,31] [%emt 00:02:31]} Qd5 {(Qd5) [%eval 0,27] [%emt 00:01:59]}
10.Nb3 {(Re1) [%eval 15,33] [%emt 00:05:04]} f6 {(Bd6) [%eval 14,28] [%emt 00:03:16]}
11.Nd3 {(Nd3) [%eval 14,30] [%emt 00:01:56]} Bf5 {(Bf7) [%eval 14,28] [%emt 00:02:41]}
12.Re1 {(Re1) [%eval 19,31] [%emt 00:01:56]} g5 {(g5) [%eval 9,28] [%emt 00:03:15]}
13.Be3 {(Qe2) [%eval 13,33] [%emt 00:05:05]} b6 {(b6) [%eval 11,26] [%emt 00:03:37]}
14.f3 {(f3) [%eval 31,31] [%emt 00:03:19]} h5 {(h5) [%eval 6,27] [%emt 00:08:07]}
15.Nf2 {(Nf2) [%eval 0,31] [%emt 00:02:19]} g4 {(Ne7) [%eval 9,25] [%emt 00:05:24]}
16.Rc1 {(Rc1) [%eval 17,29] [%emt 00:03:18]} Ne7 {(Qd7) [%eval 15,25] [%emt 00:02:33]}
17.c4 {(c4) [%eval 46,31] [%emt 00:05:40]} Qg8 {(Qg8) [%eval 7,24] [%emt 00:04:38]}
18.d5 {(Qe2) [%eval 44,32] [%emt 00:14:47]} g3 {(g3) [%eval 24,23] [%emt 00:01:44]}
19.Nd3 {(Ne4) [%eval 8,30] [%emt 00:02:15]} gxh2 {(gxh2) [%eval -13,20] [%emt 00:00:47]}
20.Kh1 {(Kh1) [%eval 0,34] [%emt 00:01:39]} h4 {(Bxd3) [%eval -13,24] [%emt 00:02:08]}
21.Bf4 {(Bf4) [%eval 60,30] [%emt 00:01:50]} Qg6 {(Qg6) [%eval -13,27] [%emt 00:03:48]}
22.Nb4 {(Nb4) [%eval 37,32] [%emt 00:02:26]} Rg8 {(Rg8) [%eval -13,26] [%emt 00:00:53]}
23.Re2 {(Qd2) [%eval 0,33] [%emt 00:01:54]} a5 {(a5) [%eval 13,24] [%emt 00:01:57]}
24.Nd4 {(Nd4) [%eval 0,35] [%emt 00:02:18]} h3 {(h3) [%eval 0,27] [%emt 00:02:49]}
25.g3 {(g3) [%eval 0,36] [%emt 00:01:45]} Bh6 {(Bh6) [%eval 0,28] [%emt 00:01:18]}
26.Nbxc6 {(Qd2) [%eval 0,37] [%emt 00:01:57]} Nxc6 {(Nxc6) [%eval -13,29] [%emt 00:01:46]}
27.Nxc6 {(Nxc6) [%eval 0,41] [%emt 00:02:10]} Qh5 {(Rde8) [%eval -5,30] [%emt 00:02:52]}
28.Ne7 {(Ne7) [%eval 0,39] [%emt 00:01:57]} Kb7 {(Kb7) [%eval 0,31] [%emt 00:02:25]}
29.Nxf5 {(Nxf5) [%eval 0,40] [%emt 00:01:09]} Qxf3 {(Qxf5) [%eval 0,32] [%emt 00:02:56]}
30.Kxh2 {(Kxh2) [%eval 0,40] [%emt 00:01:58]} Bxf4 {(Bxf4) [%eval 0,32] [%emt 00:01:31]}
31.Rc3 {(Rc3) [%eval 0,42] [%emt 00:02:07]} Qg4 {(Qg4) [%eval 0,31] [%emt 00:03:42]}
32.Qd3 {(Qf1) [%eval 0,43] [%emt 00:02:22]} Be5 {(Rg5) [%eval 0,30] [%emt 00:03:34]}
33.Rb3 {(Ra3) [%eval 8,37] [%emt 00:02:00]} Rg5 {(Rg5) [%eval -12,29] [%emt 00:07:13]}
34.Rf2 {(Rf2) [%eval 6,39] [%emt 00:02:28]} Rxf5 {(Rxf5) [%eval -12,31] [%emt 00:05:07]}
35.Qxf5 {(Qxf5) [%eval 0,41] [%emt 00:01:38]} Qxc4 {(Qxc4) [%eval -10,29] [%emt 00:00:59]}
36.Rd2 {(Rd3) [%eval 6,42] [%emt 00:01:18]} Kb8 {(Rxd5) [%eval 0,27] [%emt 00:03:57]}
37.Qf3 {(d6) [%eval 20,36] [%emt 00:05:55]} Ka7 {(Qa4) [%eval 0,25] [%emt 00:01:12]}
38.Qe2 {(Re3) [%eval 36,35] [%emt 00:01:32]} Qa4 {(Qxe2) [%eval -3,27] [%emt 00:01:06]}
39.Rbd3 {(Rf3) [%eval 2,34] [%emt 00:02:32]} Re8 {(Re8) [%eval 0,29] [%emt 00:02:42]}
40.Qd1 {(Qf2) [%eval 0,36] [%emt 00:01:15]} Qd7 {(Qd7) [%eval 0,29] [%emt 00:02:58]}
41.a3 {(b4) [%eval 0,39] [%emt 00:02:02]} f5 {(f5) [%eval 0,28] [%emt 00:01:30]}
42.Rf3 {(Rf3) [%eval 0,39] [%emt 00:00:50]} Rf8 {(Rg8) [%eval 0,30] [%emt 00:03:03]}
43.Qf1 {(Qf1) [%eval 0,40] [%emt 00:01:16]} Qg7 {(f4) [%eval 0,30] [%emt 00:02:11]}
44.b4 {(b4) [%eval 0,41] [%emt 00:01:22]} Qg4 {(Qg5) [%eval 0,32] [%emt 00:01:57]}
45.Qe2 {(Re2) [%eval 0,41] [%emt 00:01:18]} Bd6 {(Re8) [%eval 0,32] [%emt 00:01:53]}
46.bxa5 {(bxa5) [%eval 0,43] [%emt 00:01:09]} f4 {(f4) [%eval 0,34] [%emt 00:01:16]}
47.axb6 {(axb6) [%eval 0,49] [%emt 00:01:05]} Kb7 {(cxb6) [%eval 0,34] [%emt 00:01:27]}
48.Rxf4 {(Rxf4) [%eval 0,49] [%emt 00:01:15]} Qxe2 {(Qxe2) [%eval 0,42] [%emt 00:01:25]}
49.Rxe2 {(Rxe2) [%eval 0,63] [%emt 00:01:17]} Bxf4 {(Bxf4) [%eval 0,43] [%emt 00:00:28]}
50.gxf4 {(gxf4) [%eval 0,64] [%emt 00:00:59]} Rxf4 {(Rxf4) [%eval 0,49] [%emt 00:02:13]}
51.bxc7 {(Re6) [%eval 0,78] [%emt 00:01:05]} Kxc7 {(Kxc7) [%eval 0,59] [%emt 00:00:30]}
52.a4 {(Kxh3) [%eval 0,121] [%emt 00:00:42]} Rxa4 {(Rxa4) [%eval 0,83] [%emt 00:03:22]}
53.Re7 {[%eval 0,64] [%emt 00:00:43]} Kd6 {(Kd6) [%eval 0,37] [%emt 00:00:21]}
54.Rh7 {(Rh7) [%eval 0,70] [%emt 00:00:41]} Ra1 {(Kxd5) [%eval 0,41] [%emt 00:00:48]}
55.Rh8 {(Rh6) [%eval 0,64] [%emt 00:00:41]} Ra2 {(Kxd5) [%eval 0,33] [%emt 00:00:18]}
56.Kxh3 {(Kxh3) [%eval 0,71] [%emt 00:00:41]}
1/2-1/2[/pgn]