Why did he did so?

[Roger de Coverly]

Surely the knight on d5 would then fall also?

[FEN "5rk1/pp1qn1pp/2p2p2/2Pn4/3r2P1/1BP2Q2/P2B2P1/3R1RK1 b - - 0 3"]

By playing .. c6, Black has gained enough time to unpin by Qc8 or Qc7 without the Knight being loose.

[Michael Farthing]

Oh yes - my sloppy analysis had missed that c6 had already happened.

[soheil_hooshdaran]

Could someone please explain this to me?
[Event "?"]
[Site "?"] [Date "????.??.??"] [Round "?"] [White "?"] [Black "?"] [Result "*"] [SetUp "1"] [FEN "5r1k/p1p3p1/2p4p/5q2/2P1RP2/4Q3/PP5P/6K1 w - - 0 27"] 27. Qd4 c5 28. Qe5 Qg4+ 29. Kf2 Qh4+ 30. Kg2 Rf6 31. Qxc5 Qg4+ 32. Kf2 Qh3 33. Qxc7 Qxh2+ 34. Ke3 Qxb2 35. Qd8+ (35. Qxa7 Rg6 36. f5 Rg3+ 37. Kf4 Ra3 38. Re8+ Kh7 39. Qb8 Qf2+ 40. Ke4 Re3+ 41. Kd5 Qxf5+ 42. Kd6 Rd3+ 43. Kc6) 35... Kh7 36. Qd3 Qb6+ 37. Ke2 Rg6 38. Re5 Qb2+ 39. Ke3 Qc1+ 40. Kf3 Qh1+ 41. Ke3 Qg1+ 42. Ke2 Qg2+ 43. Ke3 Qg3+ 44. Ke4 Qf2 45. a3 Rg3 46. Qb1 Qd2 47. Kf5 Qd6 48. Ke4 (48. Re6 g6+ 49. Kf6 Qxf4+ 50. Ke7 Qc7+ 51. Kf6 Rf3+) 48... Rxa3 49. Rd5 Qg6+ 50. f5 Qg4+ 51. Ke5 Qg3+ 52. Ke6 Qe3+ 53. Kd7 (53. Kf7 Rb3 54. Qh1 Rb7+ 55. Kf8 Qe7#) 53... Rb3 54. Qc2 Rb7+ 55. Kc8 Rf7 56. Qg2 (56. f6+ g6 57. Qg2 Qe8+ 58. Rd8 Qe6+ 59. Kb8 Qb6+) 56... Rf8+ 57. Kd7 Qe8+ 58. Kd6 Qb8+ 59. Ke7 (59. Kd7 Qb7+ 60. Kd6 Qb4+ 61. Ke6 Rf6+ 62. Kd7 Qb7+ 63. Ke8 Qc8+ 64. Ke7 Qf8+ 65. Kd7 Rf7+ 66. Kc6 Qc8+ 67. Kb5 Rb7+ 68. Ka5 Qc7+) 59... Rf6 60. Qe4 Qf8+ 61. Kd7 Rf7+ 62. Kc6 Qc8+ 63. Kb5 Rb7+ {1-0, After} 64. Ka5 Qc7+ 65. Ka4 Qc6+ *

[Roger de Coverly]

Could someone please explain this to me?

Black got lucky? I doubt if it's all forced.

[soheil_hooshdaran]

Here:

[FEN "8/5pkp/5qp1/2Rp1n2/8/3PPNP1/rr3PKP/2Q2R2 b - - 0 1"]
Why Ra1 wouldn't work?

[Roger de Coverly]

Why Ra1 wouldn't work?

Just seeing one move ahead, White just takes it. I see that you want to make the discovered check Rxf2 work, but why cannot White take with the King? Even if you fall into the trick with Rxf2, it's still giving up two Rooks for a Queen and pawn.

I see there's also the idea of .. Nxe3. Presumably giving up a Rook to start with and winning back an exchange isn't enough. I suppose that's the line and the assessment is going to depend on what's left on the board when the dust settles.

[Christopher Kreuzer]

I think the point is that Rb1 does work but Ra1 doesn't work because after White captures on a1 with the queen and Black captures on f3 with the Black queen, the White queen captures on b2 with check to the king on g7 and White wins.

[Leonard Barden]

Bouwmeester-Botvinnik, Wageningen 1958. The great man played d5-d4? missing Rb2-b1!

[soheil_hooshdaran]

How do you explain this tactic?
[Event "?"] [Site "?"] [Date "????.??.??"] [Round "?"] [White "?"] [Black "?"] [Result "*"] [SetUp "1"] [FEN "1kr1r1b1/1pp2qp1/p4n1p/2p1p3/3n4/P1NP1P1P/1PPB1QP1/1KRB1R2 b - - 0 1"] 1... e4 2. dxe4 Nxe4 *

[MartinCarpenter]

Blundering material away in a better position (There's something very wrong with the diagram.).

[soheil_hooshdaran]

And what about this one?
[Event "?"] [Site "?"] [Date "????.??.??"] [Round "?"] [White "?"] [Black "?"] [Result "*"] [SetUp "1"] [FEN "r1b1r3/1q1nbkpp/pp6/n2p4/3N1B2/8/1PP1B1PP/R2Q1R1K w - - 0 3"] 3. Bxa6 Rxa6 4. Qh5+ Kg8 5. Qxe8+ *

[Barry Sandercock]

White just plays the best moves in the position. That's what you are supposed to do !

[Roger de Coverly]

Blundering material away in a better position(There's something very wrong with the diagram.).

If there's a Rook on f8 or not on f1, it's a deflection tactic as Nxe4 isn't possible because of .. Qa2 mate and fxe4 isn't possible because .. Qxf2 wins material.

[soheil_hooshdaran]

I mean thnhe reason for ...e4 break

[Roger de Coverly]

I mean thnhe reason for ...e4 break

I think you need to correct the diagram to a position where .. e4 doesn't lose. I doubt any great strategic idea, rather more the creation of mayhem with the .. Qa2 mate threat.