An attempt to analyze LeelaChess vs Stockfish, Game 6
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This game was the final match of LeelaChess vs Stockfish 10 today. The first five games weren't quite as spectacular, but ended with some very active draws. Both players, of course, did incredibly well considering it was 5+10 blitz. Human commentary is simply inadequate, especially my own, but after watching this game I had to offer some thoughts!
As for LeelaChess, it appears to be a fast-evolving, self-learning algorithm fashioned in the style of AlphaZero, but without Google's raw processing power. Founded in February, it went from 0 to its current Elo rating of ???, which, according to the untrained eye of myself is somewhere below Stockfish 10 and somewhere far above my own.
So, Leela imagined some kind of attack from move 21, but two things seem to stand out here-- firstly, that the attack seems to have proved delusional, as Stockfish wasn't fazed by it. To Leela's credit however, Stockfish itself agreed that Black's position was semi-playable until 40 ... Bf6? but even before that it looked to be highly unpleasant. The attack fizzled out after the rook trades, and when the dust settled White was clearly in a better position.
Anyway, without further ado, the game! The analysis is from Stockfish' "full analysis" on Chessbase; a bit dry, but who better to offer commentary than the winner of the match? Certainly not me.
{C13: French: Classical System: 4 Bg5 Be7, Alekhine-Chatard Attack} 1. e4 e6 2.
d4 d5 3. Nc3 Nf6 4. Bg5 dxe4 5. Nxe4 Be7 6. Bxf6 (6. Nxf6+ Bxf6 7. Bxf6 Qxf6
$11) 6... gxf6 {Black has the pair of bishops} (6... Bxf6 7. Nxf6+ Qxf6 8. c3
$14) 7. Nf3 {Black has a cramped position} (7. Nc3 a6 $11) 7... f5 {Black
threatens to win material: f5xe4} (7... a6 8. Qe2 f5 9. Ned2 $11) 8. Nc3 a6 {
Prevents intrusion on b5} (8... c5 9. d5 Bf6 $16) 9. a3 {Black has a cramped
position} (9. g3 b5 10. Bg2 Bb7 $11) 9... Qd6 (9... c5 10. d5 $14) 10. g3 $11 {
Secures h4} Bf6 (10... Qb6 11. Na4 Qa5+ 12. c3 $14) 11. Qd2 (11. Bg2 O-O 12.
O-O Rd8 $11) 11... b6 (11... b5 12. Bg2 Nd7 13. O-O $14) 12. Bg2 Bb7 13. Rd1 (
13. O-O Nd7 $11) 13... Nd7 14. O-O (14. Ne2 b5 $14) 14... O-O-O 15. Ne2 (15.
Rfe1 Rhg8 $11) 15... h5 (15... c5 16. c3 Kb8 17. Rfe1 $14) 16. h4 Rhg8 (16...
e5 17. d5 $14) 17. Rfe1 (17. Nf4 Rg4 18. Nxh5 Rdg8 $11) 17... Nf8 (17... e5 18.
Qh6 Rh8 19. Qc1 $11) 18. c4 (18. Nf4 Ng6 19. Nxg6 Rxg6 $11) 18... Ng6 $11 19.
b4 b5 {Black threatens to win material: b5xc4} 20. c5 {White threatens to win
material: c5xd6} Qd7 21. Qe3 Nxh4 (21... Kb8 $142 $5 {might be a viable
alternative} 22. Kh2 Qe7 $11) 22. gxh4 $16 (22. Nxh4 $6 Bxh4 23. c6 Bxc6 $11)
22... Qd5 23. Rd3 e5 24. Qc1 Rg4 (24... Rxg2+ 25. Kxg2 e4 26. Nf4 $16) 25. c6
$1 {Decoy: c6} Ba8 (25... Bxc6 26. Nxe5 {Decoy Double attack}) (25... Qxc6 26.
dxe5 {Deflection}) (25... -- $140 26. cxb7+ {Wins material}) 26. Ng3 e4 27. Nh2
Rxh4 28. Nhf1 Rg8 29. Ne3 Qd8 30. Rdd1 f4 31. Nef5 fxg3 32. fxg3 Rhg4 33. Rxe4
(33. Bxe4 Bh4 34. Rd3 Bxg3 35. Nxg3 Rxg3+ 36. Rxg3 Rxg3+ 37. Kf2 Rg8 $11) 33...
Kb8 (33... Rxe4 34. Bxe4 Qe8 35. Re1 $16) 34. Rxg4 Rxg4 35. Qe3 Rg5 $2 (35...
Rg8 36. Qf3 h4 37. gxh4 Bxh4 $18) 36. Qf2 $18 h4 (36... Qc8 37. Nd6 Qg4 38. Rd3
$18) 37. gxh4 Rg8 $2 (37... Rxf5 38. Qxf5 Bxd4+ 39. Kf1 Qxh4 40. Be4 $18) 38.
Kf1 Rh8 $6 {hardly fazing for the opponent} (38... Re8 39. h5 $18) 39. Qf3 Bxh4
40. d5 Bf6 (40... Re8 41. d6 cxd6 42. c7+ Kxc7 43. Qc3+ Kb8 44. Bxa8 Re5 45.
Nxd6 Re6 $18) 41. a4 Be5 (41... bxa4 {is not much help} 42. b5 Be5 43. Rb1 $18)
42. axb5 Qg5 (42... Qf6 {does not win a prize} 43. bxa6 Bxc6 44. dxc6 $18) 43.
d6 cxd6 (43... axb5 {cannot change destiny} 44. d7 Rd8 45. Qd3 Qf4+ 46. Ke2 $18
) 44. bxa6 Bxc6 (44... Qf4 {no good, but what else?} 45. Qxf4 Bxf4 $18) 45.
Qxc6 Qxf5+ 46. Bf3 Qh3+ 47. Ke2 Qh2+ 48. Kd3 Qh7+ 49. Kd2 Qh2+ 50. Be2 Qf4+ 51.
Kc2 Rc8 52. a7+ $1 {Deflection: c8} Kxa7 53. Qxc8 Qe4+ 54. Bd3 *