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In this game, the last move made by white was Bg5 . Now it's black's turn. A software analysis shows that black is winning in this position with -2.51 evaluation. I am unable to spot the black's next best move ? Any kind of hint is appreciated !

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    The position is dead equal according to my Stockfish. There's no forced win for Black here. Are you sure it's -2.51 pawns, not centipawns or something?
    – Glorfindel ♦
    Commented Sep 9, 2016 at 6:41
  • I was looking this position through the online software evaluation chessboard of grandchesstour.org/live-2016-sinquefield-cup-grand-chess-tour If you want you can check this out !
    – Dark_Knight
    Commented Sep 9, 2016 at 7:06
  • Can you provide a direct link to the game / position?
    – Glorfindel ♦
    Commented Sep 9, 2016 at 8:25
  • 1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Nd7 5.Nf3 Ngf6 6.Qe2 Nxe4 7.Qxe4 Nf6 8.Qd3 Bg4 9.Be2 e6 10.O-O Be7 11.Bg5
    – Dark_Knight
    Commented Sep 9, 2016 at 9:13

3 Answers 3

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This isn't a deep analysis using a computer, just my 'at a glance' thoughts.

Here are my observations:

  1. The pawn structure is typical for a Caro-Kann structure
  2. Black is a little cramped
  3. There is no forced win, so what you pick is a stylistic decision

These are the moves I would consider:

  • 1...Qc7 or 1...O-O are thematic in the Caro-Kann pawn structure
  • 1...Nd5 offering a trade of dark square bishops would help relieve Black's cramped position
  • 1...c5?! is too soon, but Black would like to get this move in sometime to challenge White's space advantage
  • 1...Bxf3?!, although exchanges a bad bishop, I think this is too soon, and I would prefer to keep the pressure on the knight
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6

This seems to be a bug in the chessboard's engine. If you look at the engine's main line, you'll see that it is bogus. After 11... h6, White will never sacrifice his bishop.

enter image description here

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White is slightly better or at least equal. Black isn't threatening anything. Maybe there's a tactic involving playing e5 or c5 and giving white doubled f-pawns but that's not worth 2 1/2 pawns. Your engine is wrong. Analyze it with a modern engine like SF and let us know what it says.

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