carldaman wrote:Lyudmil Tsvetkov wrote:
Hi Carl, thanks for the games.
That is the problem with many test suites and opening books: they contain an awful percentage of unequal positions, just like the one you used. 9. Bd3 is very bad seemingly, somewhere to the level of Nunn
. For me, after black's f3 in both games, white is hopeless. Probably the only white chance to hold the game would have been playing f3 itself. Interesting that Komodo does not find it at such a long TC.
You conveyed a point; nice comments btw.
I see what you mean regarding the opening, but while this position is not the best line White could have played (9.Bd3 is probably
?!), I can say that
a) White is not (much) worse objectively and should be able to draw with correct play for both sides
b)we are able to arrive at such an assessment only after much testing and analysis; John Nunn certainly must've liked his chances when he embarked upon this line with White
As a tester, I like this variation a lot since it reveals so much about the 'character' of each engine, and both strengths and weaknesses immediately can bubble to the surface after a smallish number of games.
For the sake of comparison I shall include the corresponding games SF played with White, showing how it was able to evade the pitfalls:
[pgn]
[Event "15m3s-SFsbK6 test"]
[Site "?"]
[Date "2013.11.29"]
[Round "2.1"]
[White "Stockfish 241113 64 SSE4.2sb"]
[Black "Komodo 6 64-bit"]
[Result "1/2-1/2"]
[ECO "B32"]
[Annotator "0.16;0.14"]
[PlyCount "70"]
[EventDate "2013.11.29"]
[EventType "tourn"]
{Intel(R) Core(TM) i3-2120 CPU @ 3.30GHz 3292 MHz W=26.4 plies; 1,539kN/s
B=21.3 plies; 1,077kN/s} 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 e5 5. Nb5 d6 6.
c4 Be7 7. N1c3 a6 8. Na3 f5 9. Bd3 f4 10. O-O {[%eval 16,24] [%emt 0:00:29]}
Nf6 {[%eval 14,21] [%emt 0:00:23]} 11. Nd5 {[%eval 10,24] [%emt 0:00:24]} O-O {
[%eval 11,20] [%emt 0:00:18]} 12. Nc2 {[%eval 0,25] [%emt 0:00:16] (Bd2)} Nxd5
{[%eval 0,22] [%emt 0:00:35]} (12... f3 $2 13. Nxe7+) 13. cxd5 {[%eval 0,26]
[%emt 0:00:21] (exd5)} Nb8 {[%eval 0,22] [%emt 0:00:22]} 14. b4 {[%eval 0,26]
[%emt 0:00:13] (Bd2)} (14. Ne1) (14. a4) (14. b3 $5) 14... Qe8 {[%eval 0,21]
[%emt 0:00:35] (Nd7)} (14... f3 $5 $13) 15. Kh1 {[%eval 0,23] [%emt 0:00:27]
(Ne1)} Nd7 {[%eval -17,19] [%emt 0:00:37]} 16. Bd2 {[%eval 0,25] [%emt 0:00:26]
(a4)} Rf6 {[%eval -24,19] [%emt 0:00:40] (Nb6)} 17. Rg1 {[%eval 0,25] [%emt 0:
00:22] (Rc1)} a5 {[%eval -22,19] [%emt 0:00:15] (Rf8)} 18. a3 {[%eval 22,23]
[%emt 0:00:15]} Bd8 $5 {[%eval -22,20] [%emt 0:00:32] (axb4)} (18... Qf7 $5 19.
Qe2 Rh6 $15) (18... Rh6) (18... axb4) 19. Qe2 {[%eval -6,22] [%emt 0:00:25]}
Bb6 {[%eval -30,20] [%emt 0:00:30]} 20. Bb5 {[%eval 0,24] [%emt 0:00:16] (Rac1)
} Qf8 $6 {[%eval -25,20] [%emt 0:00:41] (Qf7)} (20... Qe7 $5 {planning} 21. --
Rh6 $40 22. -- Rxh2+ $3) (20... Qd8 $5 21. bxa5 Rh6 22. g4 $5 (22. g3 Bxa5 23.
f3 Bxd2 24. Qxd2 Nc5 25. Rab1 fxg3 26. Rxg3 Qh4 $15) 22... Bxa5 $15 (22... Rh3
$5 23. axb6 f3 24. Qf1 Qh4 25. Qxh3 Qxh3 26. Bxd7 Bxd7 27. Bg5 $1 Bxg4 28. Ne3
$44) 23. Bb4 Bb6 (23... Qh4 24. f3 Bb6 25. Rg2 Nc5 26. a4 $13) 24. g5 $13 Rh4
25. Bxd6 Nf6 $1 26. Bxe5 Ng4 27. Rxg4 Bxg4 28. f3 Qxg5 (28... Bh3 $13 29. Bd4
Bxd4 30. Nxd4 Qxg5 31. Qb2 Rf8 32. Rg1 Qf6 (32... Qh5 33. Rxg7+) 33. Rb1 $44)
29. Bd4 $8 Bxd4 30. Nxd4 Qe5 $1 31. Rd1 $8 Bh3 $15) 21. bxa5 {[%eval -22,25]
[%emt 0:01:21] (Ne1)} Bxa5 {[%eval -35,19] [%emt 0:00:12]} 22. Bxa5 {[%eval
-24,25] [%emt 0:00:13] (Bb4)} Rxa5 {[%eval -48,17] [%emt 0:00:07]} 23. Bxd7 {
[%eval -42,24] [%emt 0:00:21] (a4)} Bxd7 {[%eval -42,17] [%emt 0:00:06]} 24. f3
{[%eval -42,27] [%emt 0:00:25] (Qd2)} Rc5 {[%eval -35,21] [%emt 0:00:52] (Qa8)}
25. Nb4 {[%eval -22,26] [%emt 0:00:30] (Rab1)} Bb5 {[%eval -28,22] [%emt 0:01:
22] (Qd8)} 26. Qd2 {[%eval -16,26] [%emt 0:00:24]} Rf7 {[%eval -14,23] [%emt 0:
01:15] (Qc8)} 27. a4 {[%eval -2,26] [%emt 0:00:14] (Nd3)} Bc4 {[%eval -4,22]
[%emt 0:00:22]} 28. Rgc1 {[%eval 0,28] [%emt 0:00:13] (Nd3)} Qa8 {[%eval 0,21]
[%emt 0:00:18] (Qd8)} 29. Nd3 {[%eval 2,27] [%emt 0:00:19]} Rcc7 {[%eval 0,21]
[%emt 0:00:09]} 30. h3 {[%eval 10,26] [%emt 0:00:18]} Qc8 {[%eval 0,22] [%emt
0:00:20] (Qd8)} 31. Kh2 {[%eval 0,28] [%emt 0:00:11] (Rab1)} h6 {[%eval 0,23]
[%emt 0:00:20]} 32. Rab1 {[%eval 0,31] [%emt 0:00:15] (Rc3)} Kh7 {[%eval 0,24]
[%emt 0:00:19] (Bxd3)} 33. Rc3 {[%eval 0,30] [%emt 0:00:13]} Bxd3 {[%eval 0,25]
[%emt 0:00:10]} 34. Rxc7 {[%eval 0,34] [%emt 0:00:11]} Rxc7 {[%eval 0,27]
[%emt 0:00:07]} 35. Qxd3 {[%eval 0,37] [%emt 0:00:12]} Rc2 {[%eval 0,28] [%emt
0:00:09]} (35... Rc2 36. Qb3 Qc5 37. Qb6 $1 $11 (37. Qxb7 $2 Qf2 $1 $19 38. Rg1
Qxf3)) 1/2-1/2
[Event "25m5s-SFsbK6 test"]
[Site "?"]
[Date "2013.11.29"]
[Round "2.1"]
[White "Stockfish 241113 64 SSE4.2sb"]
[Black "Komodo 6 64-bit MP"]
[Result "1/2-1/2"]
[ECO "B32"]
[Annotator "0.08;0.07"]
[PlyCount "88"]
[EventDate "2013.11.29"]
[EventType "tourn"]
{Intel(R) Core(TM) i3-2120 CPU @ 3.30GHz 3292 MHz W=29.0 plies; 2,731kN/s; 3,
810 TBAs B=23.7 plies; 2,053kN/s} 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 e5 5.
Nb5 d6 6. c4 Be7 7. N1c3 a6 8. Na3 f5 9. Bd3 f4 10. O-O {[%eval 8,26] [%emt 0:
00:31]} Nf6 {[%eval 7,21] [%emt 0:00:15]} 11. Nd5 {[%eval 16,26] [%emt 0:00:27]
} O-O {[%eval 9,22] [%emt 0:00:28]} 12. Bd2 {[%eval 0,25] [%emt 0:00:23]} Be6 {
[%eval 4,20] [%emt 0:00:27]} (12... Qe8 {!!? of course could be tried here} 13.
Nc7 Qg6 $40 {best move would be} 14. Bxf4 $1 (14. Nxa8 $140 $2 Bh3 $19) 14...
Bg4 15. f3 Rac8 $13 {with a complicated and unclear position, but at least
equal for black} 16. fxg4 Nxg4 17. Bg3 (17. Nd5 $143 exf4 18. Nc2 $143 f3 $1
19. Rxf3 Bh4 $17 {threatens} 20. -- Nf2) 17... Rxf1+ 18. Qxf1 Rxc7 $13) 13. Nc2
{[%eval 2,25] [%emt 0:00:43] (Bc3)} Rc8 {[%eval 0,21] [%emt 0:00:58]} 14. Rc1 {
[%eval 8,26] [%emt 0:01:03] (Bc3)} Qe8 {[%eval 5,20] [%emt 0:00:48]} 15. Nxe7+
{[%eval 16,26] [%emt 0:00:56] (f3)} Qxe7 {[%eval 0,21] [%emt 0:00:20]} 16. f3 {
[%eval 12,27] [%emt 0:00:30] (Nb4)} Nd7 {[%eval 0,21] [%emt 0:00:30] (Qd8)} (
16... g5 $5) 17. Be1 {[%eval 30,24] [%emt 0:00:31]} h5 {[%eval 5,22] [%emt 0:
00:57] (Nc5)} 18. Be2 {[%eval 34,26] [%emt 0:01:25] (Nb4)} h4 {[%eval 10,22]
[%emt 0:00:32]} 19. Kh1 {[%eval 51,26] [%emt 0:00:34]} h3 {[%eval 23,23] [%emt
0:01:51] (g5) Komodo often likes to push its h-pawn up, but this plan seems
ineffective after having castled K-side} 20. gxh3 {[%eval 44,27] [%emt 0:00:23]
} Bxh3 {[%eval 12,23] [%emt 0:00:29]} 21. Rg1 {[%eval 36,27] [%emt 0:00:24]}
Qe8 {[%eval 11,23] [%emt 0:00:46] (Kf7)} 22. Nb4 {[%eval 36,26] [%emt 0:01:08]
(Bb4)} ({SF refrains from} 22. Qxd6 Rf6 23. Qd5+ Kh7 24. Bc3 Qh5 (24... Nb6 $5
25. Qd2 Na4 26. b4 (26. Qe1 Rh6 27. Nb4 Nxc3 28. bxc3 Qh5 29. Qf2 Be6 $44)
26... Nxc3 27. Qxc3 Qh5 28. Qe1 Ne7 $5 (28... Rh6 29. Qf2 Rh8 30. b5) 29. c5
Rh6 30. Rd1 Be6 31. Rg2 Bh3 32. Rf2 a5 33. Bf1 $1 (33. a3 $143 b6 $1 34. Ba6
Rc7 35. cxb6 $4 Rxc2 $1 36. Rxc2 Qxf3+) 33... axb4 34. Bxh3 Qxh3 35. Nxb4 Nc6
36. Nd3 Qh5 $44) 25. Qd2 Rh6 26. Bd1 a5 $5 $13 27. Qf2 b6 28. Ne1 Nc5 29. Rc2 {
and White is holding on to extra pawn in a cramped position}) 22... Rf6 {
[%eval 0,22] [%emt 0:00:21]} 23. Bc3 {[%eval 38,27] [%emt 0:01:29] (Nd5)} Nxb4
{[%eval 6,22] [%emt 0:00:54]} 24. Bxb4 {[%eval 24,27] [%emt 0:00:42]} Nc5 {
[%eval 2,22] [%emt 0:00:28]} 25. Bf1 {[%eval 32,29] [%emt 0:00:45]} Bxf1 {
[%eval 11,21] [%emt 0:00:22]} 26. Qxf1 {[%eval 16,28] [%emt 0:00:44]} Rh6 {
[%eval 0,21] [%emt 0:00:19] (Rg6)} 27. Rc2 {[%eval 40,27] [%emt 0:00:46] (b3)}
b6 {[%eval 0,21] [%emt 0:00:37] (Rc7)} 28. Rcg2 {[%eval 48,28] [%emt 0:00:39]}
Rc7 {[%eval 0,21] [%emt 0:00:10]} 29. Bxc5 {[%eval 32,28] [%emt 0:02:10]} bxc5
{[%eval 0,23] [%emt 0:00:18] (dxc5)} 30. Qe1 {[%eval 20,30] [%emt 0:00:18]
(Qd3)} Qh5 {[%eval 0,26] [%emt 0:00:49]} 31. Rf2 {[%eval 20,31] [%emt 0:00:25]}
Ra7 {[%eval 0,28] [%emt 0:00:55] (Qf7)} 32. Qa5 {[%eval 10,30] [%emt 0:00:22]}
Qh4 {[%eval 0,28] [%emt 0:00:31]} 33. Rgg2 {[%eval 10,32] [%emt 0:00:32] (Rfg2)
obviously, White has enough to cover h2} Qe7 {[%eval 0,27] [%emt 0:00:29]} 34.
Rg4 {[%eval 6,32] [%emt 0:00:33] (Rd2)} Qc7 {[%eval 0,28] [%emt 0:00:38]} 35.
Qa4 {[%eval 6,32] [%emt 0:00:20]} Qd7 {[%eval 0,28] [%emt 0:00:42] (a5)} 36.
Qd1 {[%eval 6,31] [%emt 0:00:16] (Qa5)} a5 {[%eval 0,27] [%emt 0:00:35]} 37.
Rfg2 {[%eval 6,31] [%emt 0:00:17]} Kh7 {[%eval 0,27] [%emt 0:00:27] (Qe6)} 38.
b3 {[%eval 1,32] [%emt 0:00:49] (Qb3)} Qe7 {[%eval 0,26] [%emt 0:00:23] (Qe6)}
39. Rg1 {[%eval 1,32] [%emt 0:00:24]} Qe8 {[%eval 0,26] [%emt 0:00:28] (Qc7)}
40. a3 {[%eval 0,30] [%emt 0:00:17] (R1g2)} Qc8 {[%eval 0,23] [%emt 0:00:29]
(Qe6)} 41. a4 {[%eval 0,34] [%emt 0:00:15] (Qc2)} Rb7 {[%eval 0,28] [%emt 0:00:
23] (Qd7)} 42. R1g2 {[%eval 0,36] [%emt 0:00:18] (Qd2)} Qc7 {[%eval 0,26]
[%emt 0:00:25] (Ra7)} 43. Rg5 {[%eval 0,35] [%emt 0:00:19] (Rg1)} Qb6 {[%eval
0,26] [%emt 0:00:32] (Qf7)} 44. Qg1 {[%eval 0,35] [%emt 0:00:13] (Qd3)} g6 {
[%eval 0,25] [%emt 0:00:14] (Qc7)} (44... g6 45. Rxg6 $2 Rxg6 46. Rxg6 Qxb3 $19
47. Qg4 (47. Rg8 Qxf3+) 47... Qd1+ 48. Kg2 Rb2+ 49. Kh3 Qf1+ 50. Kh4 Rxh2+)
1/2-1/2
[/pgn]
Cheers,
CL