Answers.Body: <p><code>Bxf2+</code> gives away all your advantage because of the precise line you mention. The correct move is <code>e5</code> (to protect your bishop with tempo, note <code>1...e5 2.O-O exf4 3.Qxd4</code> doesn't work because of <code>Ne2+</code> fork), followed by <code>Ba6</code>, preventing castling and attacking the trapped <code>a8</code> bishop. Notice <code>Bc6-Bd7-Bg4</code> doesn't really save the bishop as shown below: (covering some side-variations as well, rather called for as it's a very concrete position)</p>
  
  <pre><code> [title "1...e5"]
   [fen "B1b2rk1/p3pp1p/6p1/q1Pp4/3b1B2/2n4P/P2Q1PP1/2R1K2R b KQq - 0 1"]
  
   1...e5 (1...Qxc5 {also a good move with similar threats except the queen discovery} 2.O-O Ba6 3.Rfe1 Rxa8 4.Be3 Bxe3 5.Rxe3 d4 {easily winning: two pieces and a pawn for the rook, together with a passed pawn and dominant knight}) (1...Ba6 {The immediate Ba6 is not good enough probably but it's a fun line, the idea with Ne2+ forking bishop and knight while still taking on a8.} 2.Qxd4 Ne2+ 3.Qd2 Qxd2+ 4.Kxd2 Rxa8 5.Be3 Nxc1 6.Rxc1 {still a pawn up but it's opposite colored-bishop so always big drawing chances.}) 2.Bh6 Ba6 3.Bc6 (3.Bxd5 Rd8 4.Bf3 Bxf2+ {wins on the spot for black}) (3.Bxf8 Bxf2+ {however white recaptures loses on the spot} 4.Kxf2 Ne4+) Rc8 4.Bd7 Rxc5 5.Bg4 Bxf2+ 6.Qxf2 Ne4+ {and you're winning the house.}
  </code></pre>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2018-01-25T14:48:31.260Z
Answers.Text: We protect our bishop with tempo, but then what are the following ideas?
Answers.UserDisplayName: Jossie Calderon
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2018-01-25T14:52:58.383Z
Answers.Text: I've shown the main variation in the diagram. You keep the king in center, you take the trapped `a8` bishop, you have huge central space with two active minor pieces + a pawn for white's out of play rook on `h1,` so white's clearly losing. This position is not so much about ideas but concrete assessment in order to convert black's advantage, hence the diagram and discussion of side-lines.
Answers.UserDisplayName: Ellie
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2018-01-25T15:44:35.733Z
Answers.Text: A sideline to add is 3.Bxf8 (by far the most natural move) which loses to the same 3...Bxf2!
Answers.UserDisplayName: Evargalo
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2018-01-25T15:50:59.800Z
Answers.Text: @Evargalo Yes indeed, added.
Answers.UserDisplayName: Ellie
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2018-01-25T14:42:43.483Z
Answers.LastActivityDate: 2018-01-25T15:53:44.637Z
Answers.LastEditDate: 2018-01-25T15:53:44.637Z
Answers.UserDisplayName: Ellie
Body: <pre><code>B1b2rk1/p3pp1p/6p1/q1Pp4/3b1B2/2n4P/P2Q1PP1/2R1K2R b K - 0 17
  </code></pre>
  
  <p>Stockfish rates this position as -2.94, so Black is clearly winning. Or is it so clear? After 1... Bxf2+ 2. Qxf2 Ne4+ 3. Bd2 Nxf2 4. Bxa5 Nxh1 5. Bxd5, White obtains the Bishop pair in an open position and a passed pawn. This is not the winning move. (Actually, there are two: The alternative is 1... Qxc5.)</p>
  
  <p>However, I cannot fathom how Black is better. Sure, material is even in terms of points, the White LSB is locked in and eventually Ba6 will be played, but when is <em>eventually</em> and how?</p>
  
Tags: <tactics>
Title: What is the winning move here and why?
ThreadText: # What is the winning move here and why?
  
  (Asked by: username_0 on 2018-01-25)
  
  ```
  B1b2rk1/p3pp1p/6p1/q1Pp4/3b1B2/2n4P/P2Q1PP1/2R1K2R b K - 0 17
  
  ```
  
  Stockfish rates this position as -2.94, so Black is clearly winning. Or is it so clear? After 1... Bxf2+ 2. Qxf2 Ne4+ 3. Bd2 Nxf2 4. Bxa5 Nxh1 5. Bxd5, White obtains the Bishop pair in an open position and a passed pawn. This is not the winning move. (Actually, there are two: The alternative is 1... Qxc5.)
  
  However, I cannot fathom how Black is better. Sure, material is even in terms of points, the White LSB is locked in and eventually Ba6 will be played, but when is *eventually* and how?
  
  **Tags:** tactics
  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_1 on 2018-01-25. Score: 4 | Accepted answer
  
  `Bxf2+` gives away all your advantage because of the precise line you mention. The correct move is `e5` (to protect your bishop with tempo, note `1...e5 2.O-O exf4 3.Qxd4` doesn't work because of `Ne2+` fork), followed by `Ba6`, preventing castling and attacking the trapped `a8` bishop. Notice `Bc6-Bd7-Bg4` doesn't really save the bishop as shown below: (covering some side-variations as well, rather called for as it's a very concrete position)
  
  ```
   [title "1...e5"]
   [fen "B1b2rk1/p3pp1p/6p1/q1Pp4/3b1B2/2n4P/P2Q1PP1/2R1K2R b KQq - 0 1"]
  
   1...e5 (1...Qxc5 {also a good move with similar threats except the queen discovery} 2.O-O Ba6 3.Rfe1 Rxa8 4.Be3 Bxe3 5.Rxe3 d4 {easily winning: two pieces and a pawn for the rook, together with a passed pawn and dominant knight}) (1...Ba6 {The immediate Ba6 is not good enough probably but it's a fun line, the idea with Ne2+ forking bishop and knight while still taking on a8.} 2.Qxd4 Ne2+ 3.Qd2 Qxd2+ 4.Kxd2 Rxa8 5.Be3 Nxc1 6.Rxc1 {still a pawn up but it's opposite colored-bishop so always big drawing chances.}) 2.Bh6 Ba6 3.Bc6 (3.Bxd5 Rd8 4.Bf3 Bxf2+ {wins on the spot for black}) (3.Bxf8 Bxf2+ {however white recaptures loses on the spot} 4.Kxf2 Ne4+) Rc8 4.Bd7 Rxc5 5.Bg4 Bxf2+ 6.Qxf2 Ne4+ {and you're winning the house.}
  
  ```
  
  > **Comments:**
  > **username_0**: We protect our bishop with tempo, but then what are the following ideas?  
  > **username_1**: I've shown the main variation in the diagram. You keep the king in center, you take the trapped `a8` bishop, you have huge central space with two active minor pieces + a pawn for white's out of play rook on `h1,` so white's clearly losing. This position is not so much about ideas but concrete assessment in order to convert black's advantage, hence the diagram and discussion of side-lines.  
  > **username_2**: A sideline to add is 3.Bxf8 (by far the most natural move) which loses to the same 3...Bxf2!  
  > **username_1**: @username_2 Yes indeed, added.  
  
  ---
  
  