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Basil
25-05-2009, 12:21 AM
Here's a (premature) miniature between a couple of 1400 players. Upon engine analysis* black sees that the engine has significant improvements* for only two moves!

Your task, regardless of your rating, is to identify the two black moves that the engine disliked 'the most'.

1. Answers in white text - signifying the move number is mandatory - offering an alternative move is optional.
2. Use no engines.

* Engine was Sigma 6.1 (without HIARCS) 45 secs/ move. The engine was asked to retain analysis where improvements of >.25 was found against the move played.

1. e4 c6 2. Nf3 d5 3. e5 Bf5 4. d3 e6 5. g3 Nd7 6. Bg2 h6 7. O-O g5 8. Re1 Ne7 9. Nbd2 Qc7 10. d4 Bh7 11. Nf1 c5 12. c3 c4 13. g4 Nc6 14. Ng3 Bg6 15. h3 Be7 16. Nh2 O-O-O 17. f4 gxf4 18. Bxf4 Qb6 19. Qd2 Rdg8 20. Bxh6 Ncxe5 21. Be3 Nd3 22. Rf1 Qxb2 0-1

Rincewind
25-05-2009, 01:36 AM
Surely one is the 22...Qxb2. With the knight ensconced on d3 both Qc7 and/or Bd6 are very tempting.
As for the other, maybe the titting around that was done with the white squared bishop? Say 10...Bh7 with Bg6 immediately as an alternative, or even something else???

road runner
25-05-2009, 08:18 AM
I reckon it wouldn't like 12...c4. Also haviong played ...c4 there is not much point with putting the knight on c6, maybe ...Ng6 would be better.

Basil
26-05-2009, 07:29 PM
Any more? Don't be put off by the 1400 strength - that's entirely irrelevant to the quality of the task.

Jesper Norgaard
16-07-2009, 08:17 PM
I don't know what the silicon beast doesn't like, but clearly to me 20.Bxh6? stands out, White offers a central pawn e5 for a measly h6 pawn which Black is happy is going anyway because it opens the h-file toward the White King, and in the process invites a Baskerville's Hound down on d3. Before that Blacks problem was how to activate Nc6, Nd7 and Be7 for some sort of attack, because the White center is not easy to jump over. Still White should be Okay after both 22.Re2 that defends the b2 pawn, or even the tactically whizzed 22.Reb1 which could start action on the b-file after a subsequent b3. It looks dangerous to put a rook right in the diagonal of the Bg6, but since Nd3 can't move without being taken, the effect of Bg6 is shielded. And I wouldn't just resign after Qxb2 just because of losing a pawn - let Black prove he knows how to take advantage of it!

O dear the question was which 2 Black moves it doesn't like! Okay, perhaps 12.c4 is not popular by a machine since it loosen tension in the centre. Also 7...g5 is potentially a weakening of the f6 square that will be a long-term problem. In the French (which this is not, but we got a French type position) the moves c5 and f6 are thematic to pressure the White centre, and the above moves both neglected this challenge to d4/e5 pawns. You can still play f6 but now gxf6 is no longer possible for Black.

Just my 5 cents of neural value!

Basil
16-07-2009, 10:59 PM
Black text OK. Perhaps a standing 'thing' should be black text after 3 days.

Basil
17-10-2009, 10:23 PM
Your task, regardless of your rating, is to identify the two black moves that the engine disliked 'the most'.

1. e4 c6 2. Nf3 d5 3. e5 Bf5 4. d3 e6 5. g3 Nd7 6. Bg2 h6 7. O-O g5 8. Re1 Ne7 9. Nbd2 Qc7 10. d4 Bh7 11. Nf1 c5 12. c3 c4 13. g4 Nc6 14. Ng3 Bg6 15. h3 Be7 16. Nh2 O-O-O 17. f4 gxf4 18. Bxf4 Qb6 19. Qd2 Rdg8 20. Bxh6 Ncxe5 21. Be3 Nd3 22. Rf1 Qxb2 0-1

The engine only 'disliked'* 2 moves from black (where disliked means an alternative score greater than +.25 more than the move played).

Those disliked moves were:
a) 10... Bd7
It wanted ... c5 - which was played next move (+0.16/ +0.44)
b) 22... Qxb2 (The final move of the game)
It wanted Bd6 (+1.65/ +2.15)