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descriptionComplex positions & engine evaluation EmptyComplex positions & engine evaluation

more_horiz
[Hide]New game
r3k2r/5pp1/p2qp2p/1p1b4/8/4Q3/PPP1BPPP/2KR3R w kq - 0 1

Analysis by Komodo 9 64-bit:

1.Rxd5 Qxd5 2.Bf3 Qc4 3.Bxa8 0-0 4.b3 Qc7 5.Be4 Rd8 6.g3 Qe7 7.Bf3 Qf6 8.Kb1 a5 9.Rd1 Rxd1+ 10.Bxd1 g6 11.f4 b4 12.Be2 Kg7 13.Qc5 Qc3 14.Qxc3+ bxc3 15.a3 Kf6 16.b4 axb4 17.axb4 e5 18.b5 exf4 19.gxf4 Ke6 20.Ka2 Kd6 21.Kb3
+-  (4.10)    Depth: 30   00:00:18  311MN, tb=94
(Expert ,  02.05.2015)
[/Hide]

[pgn][Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "New game"]
[Black "?"]
[Result "*"]
[SetUp "1"]
[FEN "r3k2r/5pp1/p2qp2p/1p1b4/8/4Q3/PPP1BPPP/2KR3R w kq - 0 1"]
[PlyCount "14"]

1. Rxd5 Qxd5 2. Bf3 Qd8 3. Bc6+ Ke7 4. Rd1 Qc7 5. Qa3+ Kf6 6. Qf3+ Ke7 7. Bxa8 *
[/pgn]

[Hide]New game
8/k3qrpR/1p1p4/p2QpPp1/P1P1P1K1/1P6/8/8 w - - 0 1

Analysis by Stockfish 030515 64 BMI2:

1.b4
+-  (2.41 ++)    Depth: 37/61   00:00:55  1052MN, tb=862615
(,  04.05.2015)
[/Hide]

[pgn][Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "New game"]
[Black "?"]
[Result "*"]
[SetUp "1"]
[FEN "8/k3qrpR/1p1p4/p2QpPp1/P1P1P1K1/1P6/8/8 w - - 0 1"]
[PlyCount "0"]

*

[/pgn]

[Hide]New game
4N1k1/4q1P1/3pn1pp/Pp2Q3/4B1P1/4Pp1K/8/6b1 w - - 0 1

Analysis by Komodo 9 64-bit:

1.Qxe6+ Qxe6 2.Bd5 Qf7 3.Bxf7+ Kxf7 4.g8Q+ Kxg8 5.Nf6+ Kg7 6.Nd5 h5 7.gxh5 gxh5 8.a6 h4 9.Ne7 Kf7 10.Nf5 f2 11.Kg2 Ke6 12.a7 Kxf5 13.a8Q h3+ 14.Kf1 h2 15.Qd5+ Kf6 16.Qxd6+ Kf7 17.Qd7+ Kf6 18.Qc6+ Ke7 19.Qe4+ Kd7 20.Qf5+ Kd8 21.Qf6+ Kc8 22.Qc6+ Kd8 23.Qd6+ Ke8 24.Qe5+ Kd8 25.Qh8+ Kd7 26.Qh7+ Kd6 27.e4 b4 28.Qg6+ Kd7 29.Qg4+ Kd6 30.Qf4+ Kd7 31.Qf5+ Kd8 32.Qd5+
+-  (3.71)    Depth: 33   00:00:56  1341MN, tb=3836192
(Expert ,  02.05.2015)
[/Hide]

[pgn][Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "New game"]
[Black "?"]
[Result "*"]
[SetUp "1"]
[FEN "4N1k1/4q1P1/3pn1pp/Pp2Q3/4B1P1/4Pp1K/8/6b1 w - - 0 1"]
[PlyCount "20"]

1. Qxe6+ Qxe6 2. Bd5 Qxd5 3. Nf6+ Kxg7 4. Nxd5 h5 5. gxh5 gxh5 6. a6 h4 7. Ne7
f2 8. Kg2 Kf7 9. Nf5 Kf6 10. Ng3 hxg3 *

[/pgn]




[Hide]Boris Spassky - Robert James Fischer, Reykjavik WCh 1972
5k2/pp4pp/4pp2/1P6/8/P2KP1P1/5P1b/2B5 b - - 0 1

Analysis by Komodo 9 64-bit:

30...Ke7 31.Bd2 Kd6 32.Bb4+ Ke5 33.e4 f5 34.Bc3+ Kd6 35.Ke3 g5 36.b6 axb6 37.Kf3 fxe4+ 38.Kg2 e3 39.fxe3 Bxg3 40.Kxg3 h5 41.Bd4 Kd5 42.Bxb6 Ke4 43.a4 e5 44.Bc5 Kf5 45.Be7 g4 46.Bd8 Ke4 47.Bc7 Kd5 48.Bb6 Ke4 49.Bc5 Kd5 50.Ba3 Ke4
+/=  (0.69)    Depth: 31   00:00:56  1135MN, tb=1351183
(Expert ,  02.05.2015)
[/Hide]

[Hide]Complex positions & engine evaluation Fische10 [/Hide]

[pgn][Event "Reykjavik WCh"]
[Site "Reykjavik WCh"]
[Date "1972.07.11"]
[Round "1"]
[White "Boris Spassky"]
[Black "Robert James Fischer"]
[Result "1-0"]
[ECO "E56"]
[SetUp "1"]
[FEN "5k2/pp4pp/4pp2/1P6/8/P2KP3/5PPb/2B5 w - - 0 30"]
[PlyCount "53"]
[EventDate "1972.??.??"]

30. g3 h5 31. Ke2 h4 32. Kf3 Ke7 33. Kg2 hxg3 34. fxg3 Bxg3 35. Kxg3 Kd6 36. a4
Kd5 37. Ba3 Ke4 38. Bc5 a6 39. b6 f5 40. Kh4 f4 41. exf4 Kxf4 42. Kh5 Kf5 43.
Be3 Ke4 44. Bf2 Kf5 45. Bh4 e5 46. Bg5 e4 47. Be3 Kf6 48. Kg4 Ke5 49. Kg5 Kd5
50. Kf5 a5 51. Bf2 g5 52. Kxg5 Kc4 53. Kf5 Kb4 54. Kxe4 Kxa4 55. Kd5 Kb5 56.
Kd6 1-0

[/pgn]

[Hide]Complex positions & engine evaluation 5510 [/Hide]

Code:

r3rbk1/4qp1p/p5pn/PpPQ4/3P4/2NBP1B1/4NPPP/6K1 b - - 0 1


[pgn][Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "New game"]
[Black "?"]
[Result "*"]
[SetUp "1"]
[FEN "r3rbk1/4qp1p/p5pn/PpPQ4/3P4/2NBP1B1/4NPPP/6K1 b - - 0 1"]
[PlyCount "0"]

*

[/pgn]

[Hide]1: Dzindzichashvili,R - Kavalek,L, Buenos Aires (ol)  1978
8/3n4/1p3kp1/p2K1p1p/P6P/1P3PP1/8/5B2 b - - 0 1

Analysis by Stockfish 030515 64 BMI2:

43...g5 44.hxg5+ Kxg5 45.Kc6 Nc5 46.Bc4 f4 47.gxf4+ Kxf4 48.Kxb6 Nd7+ 49.Kxa5 Ke5 50.Kb5 Kd6 51.a5 h4 52.Bf1 Kc7 53.f4 Kb8 54.a6 Nf6 55.f5 Nd5 56.Kc5 Nf6 57.Kc6 h3 58.Bxh3 Ka7 59.Bf1 Ng8 60.Kc5 Nf6 61.b4 Ne4+ 62.Kc6 Ng3 63.Bd3
+-  (5.10)    Depth: 35/69   00:00:10  247MN, tb=133655
(,  04.05.2015)
[/Hide]

[pgn][Event "Buenos Aires (ol) "]
[Site "Buenos Aires"]
[Date "1978.??.??"]
[Round "?"]
[White "Dzindzichashvili, Roman"]
[Black "Kavalek, Lubomir"]
[Result "1/2-1/2"]
[Annotator "GM Lubomir Kavalek/The Huffington Post"]
[SetUp "1"]
[FEN "8/3n4/1pp2kp1/p2p1p1p/P2K1N1P/1P3PP1/8/5B2 w - - 0 42"]
[PlyCount "30"]
[EventDate "1978.??.??"]
[EventCountry "ARG"]

{The game was adjourned here and Dzindzi sealed. He didn't make any secret
about the following knight sacrifice.} 42. Nxd5+ $1 {"This wins easily,"
Dzindzi proclaimed before leaving the tournament hall.} cxd5 43. Kxd5 g5 44.
Kc6 {Straightforward, but Dzindzi could have stopped the fun with 44.f4!?. He
was afraid that after 44....g4 I would be able to win the pawn g3 with
Nd7-c5-e4xg3. Naroditsky found all this. Some examples:} (44. f4 $5 g4 45. Kc6
Nc5 46. Kxb6 Ne4 (46... Nxb3 47. Bc4 Nd2 48. Bd3 Ne4 49. Kxa5 Nxg3 50. Kb5 $18)
47. Kxa5 Nxg3 48. Bg2 Ne2 49. Kb6 Nxf4 50. Bb7 {and the a-pawn is unstoppable.}
) 44... Ne5+ 45. Kxb6 Nxf3 46. Kxa5 Nd2 47. hxg5+ $2 {In his comments after
the game, Dzindzi was too harsh on himself, giving his last move two question
marks.} ({True,} 47. Bg2 {would have won easily, but the victory is still
there.}) 47... Kxg5 48. Bg2 ({It is starting to get slightly tricky, for
example} 48. Kb6 Nxf1 49. a5 Nxg3 50. a6 h4 51. a7 h3 52. a8=Q h2 {and a draw
is likely.}) 48... Kg4 $1 49. Kb6 $2 {Throwing the win away.} ({White also
wins after} 49. Bd5 Kxg3 {but he has to allow black to queen:} 50. Kb6 $2 (50.
b4 $1 f4 (50... Ne4 51. b5 Nd6 52. b6 f4 53. Kb4 f3 54. Bxf3 Kxf3 55. a5 $18)
51. b5 f3 52. b6 (52. Bxf3 {only draws.}) 52... f2 53. b7 f1=Q {I didn't
bother to look further. I thought it was a draw, but now the computers show
that White wins:} 54. b8=Q+ Kf2 (54... Kh3 55. Qc8+ Kh2 56. Qc7+ Kh3 57. Qc3+
$18) 55. Qf4+ Ke1 56. Qxf1+ Nxf1 57. Kb4 {and the a-pawn queens.}) (50. Kb4 Ne4
$11) 50... Ne4 $11) ({White has a narrow pass to win with} 49. Kb4 $1 Kxg3 50.
Bh1 $1 {I saw this position in my analysis and I considered it hopeless. The
black king can go after the bishop and take it on h1, but it blocks the
queening square and White queens with a check. Allen Van Gelder, a professor
of computer science, University of California, Santa Cruz, came to the same
conclusion. The alternative is to run with the f-pawn, but it is also
inadequate.} f4 51. a5 f3 52. Bxf3 Nxf3 53. a6 h4 (53... Nd4 54. Kc5 $1 Nxb3+
55. Kc4 Na5+ 56. Kd5 $18) 54. a7 h3 55. a8=Q h2 {and White brings the queen to
h3 and wins:} 56. Qg8+ Kf2 57. Qh7 Kg2 58. Qg6+ Kf1 (58... Kh3 59. Qh5+ Nh4 60.
Qd5 $18) 59. Qh5 Kg2 60. Qg4+ Kf2 61. Qh3 $18) 49... Kxg3 50. a5 Kxg2 51. a6 h4
52. a7 h3 53. a8=Q+ Ne4 {I established during the night analysis that White
can't win now.} 54. Qg8+ (54. Qd5 h2 55. Qxf5 Nf2 $11) 54... Ng3 55. Qd5+ Kf2
56. Qd2+ Kg1 {The knight protects the f-pawn and Black threatens to advance
the h-pawn. White has to give a perpetual check.} 1/2-1/2[/pgn]

[Hide]1: Walter Shawn Browne - Vasily Smyslov, Las Palmas Interzonal 1982
7r/5ppp/8/3n4/p1bp4/Pk3PP1/1P1K1NBP/2R5 w - - 0 1

Analysis by Komodo 9 64-bit:

28.Bh3 Ne3
-/+  (-1.28 --)    Depth: 26   00:00:17  350MN, tb=14976
(05.05.2015)
[/Hide]

[Hide]Complex positions & engine evaluation Black_10 [/Hide]

[pgn][Event "Las Palmas Interzonal"]
[Site "Las Palmas ESP"]
[Date "1982.07.25"]
[Round "10"]
[White "Walter Shawn Browne"]
[Black "Vasily Smyslov"]
[Result "0-1"]
[ECO "E11"]
[SetUp "1"]
[FEN "7r/5ppp/5n2/8/p1bp4/Pk3PP1/1P1K1NBP/2R5 b - - 0 27"]
[PlyCount "10"]
[EventDate "1982.07.12"]

27... Nd5 28. Ne4 Ne3 29. Nc5+ Ka2 30. Bh3 Bb3 31. Bd7 Nc4+ 32. Kd3 0-1

[/pgn]

Last edited by QueensideCastler on Mon May 04, 2015 11:28 pm; edited 7 times in total

descriptionComplex positions & engine evaluation EmptyExchange Sacrifice / Double Exchange Sacrifice

more_horiz
[Hide]Zhu Chen - Taimanov,M, Veterans-Women 1997
n1r5/1p2Pp1r/5kp1/p2P4/P4N1P/1P3BP1/8/5NK1 w - - 0 1

Analysis by Stockfish 030515 64 BMI2:

42.d6 Rhh8 43.d7 Kxe7 44.dxc8N+ Rxc8 45.Bxb7 Rb8 46.Bg2 Nb6 47.Kf2 Nd7 48.Nd2 Ne5 49.Bd5 f6 50.Ke3 g5 51.hxg5 fxg5 52.Ne6 Ng4+ 53.Kd3 Rh8 54.Kd4 Nf6 55.Bc4 g4 56.Ne4 Rh2 57.Ke5 Nxe4 58.Kxe4 Rf2 59.Nf4 Kf6 60.Nd3 Re2+ 61.Kf4
+-  (2.53)    Depth: 34/57   00:00:22  404MN, tb=4093
(,  04.05.2015)
[/Hide]

[pgn][Event "Veterans-Women"]
[Site "Copenhagen"]
[Date "1997.??.??"]
[Round "4"]
[White "Zhu Chen"]
[Black "Taimanov, Mark E"]
[Result "1-0"]
[ECO "E11"]
[WhiteElo "2515"]
[BlackElo "2425"]
[SetUp "1"]
[FEN "n1R1r3/1p2Pp1r/5kp1/p2P4/P4N1P/1P3BP1/8/5NK1 b - - 0 41"]
[PlyCount "36"]
[EventDate "1997.??.??"]

41... Rxc8 42. d6 Nb6 43. Bxb7 Rhh8 44. Ne3 Rb8 45. Bc6 Ke5 46. d7 Nxd7 47.
Bxd7 Kd6 48. e8=Q Rhxe8 49. Bxe8 Rxe8 50. Nc4+ Kc5 51. Nxa5 Kb4 52. Nb7 Kxb3
53. a5 Re1+ 54. Kg2 Ra1 55. Nd6 Rxa5 56. Nxf7 Rf5 57. Nh6 Rf6 58. Ng4 Ra6 59.
Ne5 1-0

[/pgn]

[Hide]1: Octavio Troianescu - Tigran Vartanovich Petrosian, Bucharest It 1953
5bk1/5p2/1q2p1pp/3p4/P3bP2/1Pp3P1/3RQ2P/4RK2 w - - 0 1

Analysis by Stockfish 030515 64 BMI2:

37.Rd3 Bf5 38.g4 Bxd3 39.Qxd3 Qc7 40.Kg2 Qxf4 41.Qf3 Qc7 42.Qd3 Ba3 43.Re2 d4 44.a5 Qb7+ 45.Kg1 Qxb3 46.a6 Bc5 47.Re5 Qa3 48.Re2 Qa4 49.Rf2 Qc6 50.Ra2 Bb6 51.h4 Kg7 52.a7 Qa8
-/+  (-1.58)    Depth: 29/46   00:00:10  149MN, tb=1072
(04.05.2015)
[/Hide]

[pgn][Event "Bucharest"]
[Site "It"]
[Date "1953.??.??"]
[Round "?"]
[White "Octavio Troianescu"]
[Black "Tigran Vartanovich Petrosian"]
[Result "0-1"]
[ECO "A04"]
[SetUp "1"]
[FEN "2r2bk1/5p2/1q2p1pp/1N1p4/Pp2bP2/1P4P1/3RQ2P/4RK2 b - - 0 35"]
[PlyCount "45"]
[EventDate "1953.??.??"]

35... Rc3 36. Nxc3 bxc3 37. Rc2 Qxb3 38. Rec1 Bb4 39. g4 Bxc2 40. Rxc2 Qxa4 41.
f5 exf5 42. gxf5 g5 43. h4 Bc5 44. hxg5 Qf4+ 45. Ke1 Qg3+ 46. Kd1 Qg1+ 47. Qe1
Qxe1+ 48. Kxe1 hxg5 49. Ke2 Bd4 50. Ra2 Kg7 51. Kd3 Be5 52. Ra5 Kf6 53. Rxd5
Kxf5 54. Ke3 f6 55. Rc5 Kg4 56. Rc4+ Kg3 57. Ke4 g4 0-1

[/pgn]

[Hide]1: Garry Kasparov - Alexey Shirov, Horgen SWZ 1994
r2qk2r/1n3ppp/p2p1b2/3Np3/4P3/2P5/1PN2PPP/3QKB1R w Kkq - 0 1

Analysis by Komodo 9 64-bit:

18.Ncb4 Nc5 19.Qf3 0-0 20.Nc6 Qd7 21.Nxf6+ gxf6 22.Qxf6 Qxc6 23.Qg5+ Kh8 24.Qf6+ Kg8
=  (0.00)    Depth: 26   00:00:09  129MN
(04.05.2015)
[/Hide]

[pgn][Event "Horgen SWZ"]
[Site "Horgen SWZ"]
[Date "1994.??.??"]
[Round "9"]
[White "Garry Kasparov"]
[Black "Alexey Shirov"]
[Result "1-0"]
[ECO "B33"]
[SetUp "1"]
[FEN "r2qk2r/1b1n1ppp/p2p1b2/3Np3/1R2P3/2P5/1PN2PPP/3QKB1R b Kkq - 0 16"]
[PlyCount "44"]
[EventDate "1994.??.??"]

16... Nc5 17. Rxb7 Nxb7 18. b4 Bg5 19. Na3 O-O 20. Nc4 a5 21. Bd3 axb4 22. cxb4
Qb8 23. h4 Bh6 24. Ncb6 Ra2 25. O-O Rd2 26. Qf3 Qa7 27. Nd7 Nd8 28. Nxf8 Kxf8
29. b5 Qa3 30. Qf5 Ke8 31. Bc4 Rc2 32. Qxh7 Rxc4 33. Qg8+ Kd7 34. Nb6+ Ke7 35.
Nxc4 Qc5 36. Ra1 Qd4 37. Ra3 Bc1 38. Ne3 1-0

[/pgn]

[Hide]1: Boris Gelfand - Peter Leko, Leko-Gelfand Match 2010
8/p2k1p2/3Pp2p/1p6/2pb1n1P/5P2/PP3P2/R4RK1 w - - 0 1

Analysis by Komodo 9 64-bit:

26.Rab1 Nh3+ 27.Kg2 Nf4+ 28.Kh2 Be5 29.Kg1 Nh3+ 30.Kh1 Bd4 31.Kh2 Nxf2 32.b3 Nd3 33.bxc4 bxc4 34.Rfd1 Kxd6 35.Kg2 Bb6 36.Kf1 Kc5 37.Ke2 f5 38.Kd2 Ba5+ 39.Ke3 Bb6 40.a4 e5 41.Kd2 Kd4 42.Rb5 Bd8 43.Rb7
+/-  (1.03)    Depth: 26   00:00:26  467MN, tb=3632
(04.05.2015)
[/Hide]

[pgn][Event "Leko-Gelfand Match"]
[Site "Miskolc HUN"]
[Date "2010.08.28"]
[Round "5"]
[White "Boris Gelfand"]
[Black "Peter Leko"]
[Result "1-0"]
[ECO "D44"]
[WhiteElo "2739"]
[BlackElo "2734"]
[SetUp "1"]
[FEN "2k5/p4p2/3rp2p/1p2P3/2pb1n1P/5P2/PP3P2/R4RK1 w - - 0 25"]
[PlyCount "41"]
[EventDate "2010.08.25"]

25. exd6 Kd7 26. a4 b4 27. Rac1 c3 28. Rfd1 e5 29. bxc3 bxc3 30. Kf1 f6 31. Rc2
Nd5 32. Rb1 a5 33. Ke2 Nb4 34. Kd1 Kxd6 35. Rb3 Nxc2 36. Kxc2 h5 37. Rb5 Bxf2
38. Rxa5 Bxh4 39. Rb5 Bf2 40. Rb7 Kc6 41. Rf7 Kb6 42. Rxf6+ Ka5 43. Rf5 Kxa4
44. Rxe5 h4 45. Kxc3 1-0
[/pgn]

[Hide]1: Magnus Carlsen - Levon Aronian, Botvinnik Memorial Rapid 2011
6k1/5p1p/1qn2bpB/p1pbp3/3p4/P2P2P1/1P3P1P/1RQ1R1K1 w - - 0 1

Analysis by Stockfish 030515 64 BMI2:

28.f4 e4 29.b4 cxb4 30.axb4 axb4 31.dxe4 Ba2 32.Ra1 d3+ 33.Kg2 Qa6 34.Qc5 Be7 35.Qd5 Bxd5 36.Rxa6 d2 37.Rd1 Bxe4+ 38.Kh3 f6 39.Rxd2 Kf7 40.Rb6 Na5 41.Re2 f5 42.Bg5 Bc5 43.Rb5 Nb3 44.Rb2 Bc6 45.Rb8 Nd4 46.Rc8 Ke6 47.Rc7 Kd5 48.Rxh7 b3 49.Kg2 Kc4+ 50.Kf1 Bb4
+-  (2.17)    Depth: 33/51   00:00:44  675MN, tb=16
(04.05.2015)
[/Hide]

[pgn][Event "Botvinnik Memorial Rapid"]
[Site "Moscow RUS"]
[Date "2011.09.03"]
[Round "4"]
[White "Magnus Carlsen"]
[Black "Levon Aronian"]
[Result "0-1"]
[ECO "A36"]
[WhiteElo "2823"]
[BlackElo "2807"]
[SetUp "1"]
[FEN "6k1/5p1p/1qn2bpB/p1pBp3/3p4/Pb1P2P1/1P3P1P/1RQ1R1K1 b - - 0 27"]
[PlyCount "117"]
[EventDate "2011.09.02"]

27... Bxd5 28. Qd1 Be7 29. h4 Qb7 30. Kh2 f6 31. Qe2 Nd8 32. Bd2 Bf3 33. Qf1 a4
34. Qh3 h5 35. Ba5 Nf7 36. Qe6 Bd5 37. Qh3 Qb5 38. Bc7 Qxd3 39. g4 Qd2 40. Kg1
Be6 41. Qg2 hxg4 42. Rbc1 Kg7 43. Bb6 c4 44. Qc6 g3 45. fxg3 Bh3 46. Qf3 Qxb2
47. Ba7 Qb3 48. Qxb3 cxb3 49. Bxd4 Bxa3 50. Ra1 Bb4 51. Reb1 exd4 52. Rxa4 Bc5
53. Ra5 Bb6 54. Rb5 Bc7 55. R5xb3 Be5 56. Kf2 Nd6 57. Kf3 Be6 58. Ra3 Bd5+ 59.
Ke2 Nb5 60. Ra5 Nc3+ 61. Kf2 d3 62. Rxd5 Nxd5 63. Rb7+ Bc7 64. Kf3 Kh6 65. Rb3
Bxg3 66. Rxd3 Nf4 67. Rd8 Nh5 68. Kg4 f5+ 69. Kh3 Be5 70. Ra8 Bf6 71. Ra6 Kg7
72. Ra7+ Kf8 73. Rb7 Be7 74. Ra7 Kf7 75. Ra6 Nf6 76. Kg3 Ne4+ 77. Kh3 Bc5 78.
Rc6 Bd6 79. Ra6 Kg7 80. Ra8 Be5 81. Ra7+ Kh6 82. Rb7 Nf6 83. Re7 Ng4 84. Ra7
Bf6 85. Rf7 Kh5 0-1

[/pgn]

[Hide]1: Sergei Movsesian - Garry Kasparov, Sarajevo Sarajevo BIH 2000
3qkb1r/1b1n1ppp/pn1pp3/1p6/3NP1P1/2PBBP2/P1P2Q1P/1K1R3R b k - 0 1

Analysis by Stockfish 030515 64 BMI2:

14...Na4 15.Ne2
=  (-0.06 --)    Depth: 29/38   00:00:41  497MN
(04.05.2015)
[/Hide]

[pgn][Event "Sarajevo"]
[Site "Sarajevo BIH"]
[Date "2000.05.29"]
[Round "11"]
[White "Sergei Movsesian"]
[Black "Garry Kasparov"]
[Result "0-1"]
[ECO "B90"]
[SetUp "1"]
[FEN "r2qkb1r/1b1n1ppp/pn1pp3/1p6/3NP1P1/2N1BP2/PPP2Q1P/1K1R1B1R b kq - 0 12"]
[PlyCount "41"]
[EventDate "2000.05.17"]

12... Rc8 13. Bd3 Rxc3 14. bxc3 Qc7 15. Ne2 Be7 16. g5 O-O 17. h4 Na4 18. Bc1
Ne5 19. h5 d5 20. Qh2 Bd6 21. Qh3 Nxd3 22. cxd3 b4 23. cxb4 Rc8 24. Ka1 dxe4
25. fxe4 Bxe4 26. g6 Bxh1 27. Qxh1 Bxb4 28. gxf7+ Kf8 29. Qg2 Rb8 30. Bb2 Nxb2
31. Nd4 Nxd1 32. Nxe6+ Kxf7 0-1

[/pgn]

[Hide]Pablo Ricardi - Nicolai Vesterbaek Pedersen, 36th Olympiad 2004
6k1/3P1p1p/1qB1p1p1/2p5/1pP4P/1P2B1P1/5P2/6K1 b - - 0 1

Analysis by Stockfish 030515 64 BMI2:

32...Kg7 33.Bxc5 Qxc5 34.d8Q Qxc6 35.Qd4+ Kf8 36.c5 Qb7 37.Qd6+ Ke8 38.c6 Qc8 39.c7 Qd7 40.Qb6 Qc8 41.Qc6+ Ke7 42.Kg2 Kf8 43.Qd6+ Ke8 44.Kf3 Qd7 45.Qc5 Qc8 46.Qc6+ Ke7 47.Kf4 h6 48.Ke3 g5 49.hxg5 hxg5 50.f3 e5 51.Ke4 g4 52.fxg4 Qxg4+ 53.Kxe5 Qxg3+ 54.Kd4 Qg1+ 55.Kd5 Qg5+ 56.Kc4
+-  (2.28)    Depth: 35/60   00:00:21  426MN, tb=63480
(05.05.2015)
[/Hide]

[pgn][Event "36th Olympiad"]
[Site "Calvia ESP"]
[Date "2004.10.19"]
[Round "5"]
[White "Pablo Ricardi"]
[Black "Nicolai Vesterbaek Pedersen"]
[Result "1-0"]
[ECO "A13"]
[WhiteElo "2548"]
[BlackElo "2466"]
[SetUp "1"]
[FEN "2r3k1/3P1p1p/1qn1p1p1/2p5/1pP1Q2P/1P2B1P1/5PB1/6K1 b - - 0 30"]
[PlyCount "44"]
[EventDate "2004.10.15"]

30... Rc7 31. Qxc6 Rxc6 32. Bxc6 Kg7 33. Ba4 e5 34. Bxc5 Qd8 35. Ba7 e4 36. Kg2
Qf6 37. Be3 h6 38. c5 g5 39. c6 gxh4 40. Bf4 e3 41. Bxe3 hxg3 42. fxg3 Qe7 43.
Kf3 Qf6+ 44. Ke4 Qg6+ 45. Kd4 Qc2 46. Kd5 Qf5+ 47. Kc4 Qe6+ 48. Kb5 Qe5+ 49.
Bc5 Qd5 50. Kb6 h5 51. c7 Qe6+ 52. Bc6 1-0

[/pgn]

descriptionComplex positions & engine evaluation EmptyThe Bishop Pair & Imbalance

more_horiz
[Hide]Irina Botvinnik - Alexandra Samaganova, 37th Chess Olympiad: Women 2006
6k1/4b3/3pP2p/6p1/3B4/4P1PB/5PKP/2r5 b - - 0 1

Analysis by Komodo 9 64-bit:

38...Kf8 39.Bg4 Rc2 40.Bd1 Rd2 41.Bh5 Bd8 42.Bf7 d5 43.Kf3 Be7 44.Bg6 Bb4 45.Bf6 Ra2 46.Bb1 Ra6 47.Bf5 Bc5 48.Kg2 Be7 49.Bd4 Ra2 50.g4 Ra5 51.h3 Ra6 52.Kf3 Bb4 53.Bf6 Be7 54.Bc3 Rc6
+/=  (0.31)    Depth: 31   00:00:41  756MN, tb=280403
(05.05.2015)
[/Hide]

[pgn][Event "37th Chess Olympiad: Women"]
[Site "Turin ITA"]
[Date "2006.05.22"]
[Round "2"]
[White "Irina Botvinnik"]
[Black "Alexandra Samaganova"]
[Result "1-0"]
[ECO "A36"]
[WhiteElo "2211"]
[BlackElo "2087"]
[SetUp "1"]
[FEN "2r3k1/2r1b3/3pP2p/1Q4p1/3Bq3/n3P1PB/5P1P/1R1R2K1 w - - 0 34"]
[PlyCount "93"]
[EventDate "2006.05.21"]

34. Qb2 Nxb1 35. Rxb1 Qxb1+ 36. Qxb1 Rc1+ 37. Qxc1 Rxc1+ 38. Kg2 Rc4 39. Bf5
Ra4 40. Kf3 Ra2 41. Bb1 Rd2 42. Bc3 Rd1 43. Bf5 d5 44. Bd4 Rd2 45. Bb1 Kf8 46.
Bc3 Rd1 47. Ba2 h5 48. Bd4 Rd2 49. Bxd5 Rd1 50. Ke2 Rc1 51. Be4 Rc7 52. f4 gxf4
53. gxf4 Bh4 54. Kd3 Ke7 55. f5 Bf6 56. Bb6 Rc3+ 57. Ke2 Be5 58. h3 Rc4 59. Bf3
h4 60. Kd3 Rc8 61. Ke4 Bf6 62. Kd5 Rc2 63. Bc5+ Ke8 64. e4 Rd2+ 65. Kc6 Rc2 66.
Kd5 Rd2+ 67. Kc4 Rc2+ 68. Kb5 Rb2+ 69. Ka4 Rb1 70. Bh5+ Kd8 71. e5 Be7 72. Bd6
Rf1 73. Bg4 Rf4+ 74. Kb5 Rxg4 75. hxg4 h3 76. f6 h2 77. Bxe7+ Ke8 78. Bd6 h1=Q
79. f7+ Kd8 80. f8=Q# 1-0

[/pgn]

[Hide]Evgeny Alekseev - Sergey Karjakin, 4th FIDE Grand Prix 2009
2r5/4kppp/p1nb4/1p2p3/4B1P1/1PP1B2P/P4P2/3R1K2 w - - 0 1

Analysis by Komodo 9 64-bit:

25.Bf5 Ra8 26.h4 h6 27.b4 a5 28.Be4 Rc8 29.a3 axb4 30.axb4 Nb8 31.Rc1 Nd7 32.g5 hxg5 33.hxg5 Ke6 34.Bd3 Rb8 35.Ra1 f5 36.Ra5 Rc8 37.Ra3 Rb8 38.f3 e4 39.fxe4 fxe4 40.Bxe4 Ne5
+/-  (0.82)    Depth: 28   00:00:29  461MN, tb=593
(05.05.2015)
[/Hide]

[pgn][Event "4th FIDE Grand Prix"]
[Site "Nalchik RUS"]
[Date "2009.04.24"]
[Round "9"]
[White "Evgeny Alekseev"]
[Black "Sergey Karjakin"]
[Result "1-0"]
[ECO "B90"]
[WhiteElo "2716"]
[BlackElo "2721"]
[SetUp "1"]
[FEN "2r5/1p2kppp/p1nb4/4p3/4B1P1/1PP1B2P/P4P2/3R1K2 b - - 0 24"]
[PlyCount "46"]
[EventDate "2009.04.15"]

24... b5 25. b4 Nd8 26. Rc1 Ne6 27. Ke2 Rb8 28. Ra1 Nf4+ 29. Kd2 Nxh3 30. Rh1
Nf4 31. Rxh7 Kf6 32. Kc2 Bc7 33. Ba7 Rd8 34. Rh1 a5 35. Rb1 axb4 36. Rxb4 Kg5
37. f3 g6 38. Rxb5 f5 39. gxf5 gxf5 40. Bb7 Ng2 41. Bf2 Bd6 42. a4 Kf4 43. a5
e4 44. fxe4 fxe4 45. Bb6 Rg8 46. a6 e3 47. Kd3 1-0

[/pgn]

[Hide]Garry Kasparov - Nigel Short, Kasparov vs Short (Rapid) 2015
r5qk/1p4np/p6B/4Q2B/8/P7/1P4PP/6K1 b - - 0 1

Analysis by Stockfish 030515 64 BMI2:

32...Rc8 33.Bf3 Qf7 34.h3 b5 35.Kh1 Rd8 36.Bg5 Re8 37.Qd4 Qc4 38.Qxc4 bxc4 39.Bf6 h6 40.Bc3 Re7 41.Bd5 Rc7 42.g4 Kh7 43.Kg2 Ne8 44.Kg3 Rc5 45.Be4+ Kg8 46.Bb7 Nd6 47.Bf3 Rc8 48.Bd5+ Kf8 49.Kf4 Ke7 50.Ke5 Re8 51.Bd2 Kd7+ 52.Kd4
+/=  (0.45)    Depth: 35/53   00:00:37  615MN, tb=3834
(,  05.05.2015)
[/Hide]

[pgn][Event "Kasparov vs Short (Rapid)"]
[Site "Saint Louis USA"]
[Date "2015.04.25"]
[Round "1"]
[White "Garry Kasparov"]
[Black "Nigel Short"]
[Result "1/2-1/2"]
[ECO "E11"]
[WhiteElo "2812"]
[BlackElo "2664"]
[SetUp "1"]
[FEN "r5qk/1p4np/p4Q1B/4p2B/8/P7/1P4PP/6K1 w - - 0 32"]
[PlyCount "24"]
[EventDate "2015.04.25"]

32. Qxe5 Rc8 33. Bf3 Qf7 34. h3 b5 35. Be4 Re8 36. Qd4 Qe7 37. b4 Qe5 38. Qd7
Qa1+ 39. Kh2 Rxe4 40. Bxg7+ Qxg7 41. Qd8+ Qg8 42. Qf6+ Qg7 43. Qd8+ Qg8 1/2-1/2

[/pgn]

[Hide]New game
2R1nb2/5k1p/6p1/3P1p2/4b3/4N1PP/5P1K/8 w - - 0 1

Analysis by Stockfish 030515 64 BMI2:

1.Ra8 Nf6 2.Ra7+ Kg8 3.Ra5 Bb4 4.Rb5 Be7 5.Kg1 Kf7 6.Ra5 Ke8 7.Ra8+ Bd8 8.Ra4 Bc7 9.g4 Kd7 10.gxf5 gxf5 11.Kf1 h5 12.f3 Bxf3 13.d6 Bxd6 14.Nxf5 Be5 15.Ra7+ Kd8 16.Ra6 Nd7 17.Rh6 Nf6 18.Kf2 Bd5 19.Kg1 Be6 20.Ng7
-/+  (-1.21)    Depth: 34/48   00:00:20  304MN, tb=30902
(05.05.2015)
[/Hide]

[pgn][Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "New game"]
[Black "?"]
[Result "*"]
[SetUp "1"]
[FEN "2R1nb2/5k1p/6p1/3P1p2/4b3/4N1PP/5P1K/8 w - - 0 1"]
[PlyCount "0"]

*

[/pgn]

Links: An Exchange versus the Bishop Pair

descriptionComplex positions & engine evaluation EmptyBishop Pair vs Exchange

more_horiz
As for rook and knight vs. two bishops and pawn, with nothing else but pawns on the board, the rook's side has a mild advantage, but add a rook to each side and the game is dead even. In general, with other pieces on the board, this imbalance should be considered even, with only a trivial edge for the rook's side.
[rn2k2r/ppppp1pp/8/8/8/8/PPPPPPPP/2B1KB1R w Kkq - 0 1]







[Average evaluation = -0,2434]

[pgn][Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "The Bishop Pair + Pawn vs The Exchange"]
[Black "?"]
[Result "*"]
[SetUp "1"]
[FEN "rn2k2r/ppppp1pp/8/8/8/8/PPPPPPPP/2B1KB1R w Kkq - 0 1"]
[PlyCount "0"]

*

[/pgn]



As for rook and knight vs. two bishops and pawn, with nothing else but pawns on the board, the rook's side has a mild advantage.


[1n2k2r/ppppp1pp/8/8/8/8/PPPPPPPP/2B1KB2 w k - 0 1]







[Average evaluation = -0,5534]

[pgn][Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "The Bishop Pair + Pawn vs The Exchange"]
[Black "?"]
[Result "*"]
[SetUp "1"]
[FEN "1n2k2r/ppppp1pp/8/8/8/8/PPPPPPPP/2B1KB2 w k - 0 1"]
[PlyCount "0"]

*

[/pgn]




[Engine Testing]

[pgn][Event "The Bishop Pair + Pawn vs The Exchange, Rapid 15m+10s"]
[Site "EXPERT-PC"]
[Date "2015.05.09"]
[Round "1"]
[White "Stockfish 070515 64 BMI2"]
[Black "Komodo 9.01 64-bit"]
[Result "1/2-1/2"]
[Annotator ""]
[SetUp "1"]
[FEN "rn2k2r/ppppp1pp/8/8/8/8/PPPPPPPP/2B1KB1R w Kkq - 0 1"]
[PlyCount "133"]
[TimeControl "900+10"]

{Intel(R) Core(TM) i7-5960X CPU @ 3.00GHz 2300 MHz  W=51.1 plies; 20 796kN/s;
81 316 985 TBAs  B=34.8 plies; 23 190kN/s; 156 739 095 TBAs;
PlaychessNightmare.ctg} 1. d4 {-0.26/27 51 Both last book move} d6 {-0.32/25 68
} 2. e4 {-0.23/27 15} Nd7 {-0.35/23 19} 3. Be3 {-0.21/26 15} O-O-O {-0.30/24
69 (c6)} 4. f3 {-0.13/27 41} e5 {-0.29/24 112 (c6)} 5. d5 {-0.10/30 25 (g3)} c6
{-0.34/27 35} 6. dxc6 {-0.13/26 6} bxc6 {-0.38/25 11} 7. Bc4 {-0.14/29 15} Kb7
{-0.39/26 40 (Kc7)} 8. Bd2 {-0.11/33 33 (0-0)} Nb6 {-0.38/26 21} 9. Bd3 {-0.13/
32 15} Na4 {-0.38/26 30} 10. O-O {-0.21/30 25} h6 {-0.30/26 65 (Nc5)} 11. b4 {
-0.02/30 55} Kc7 {-0.32/25 43 (Nb6)} 12. Rb1 {0.00/34 33} Ra8 {-0.28/25 10 (a5)
} 13. Ba6 {0.00/40 30} Rhd8 {-0.29/26 32 (Kb6)} 14. Rb3 {0.00/35 30} d5 {-0.21/
26 10} 15. exd5 {0.00/36 30} cxd5 {-0.10/26 43 (Rxd5)} 16. Ra3 {0.00/33 31} Nb6
{-0.09/27 12} 17. Bc3 {0.04/28 3 (Ra5)} Re8 {-0.18/26 17 (Nc4)} 18. Ra5 {0.00/
33 28} Re6 {-0.21/25 17 (Kd6)} 19. a4 {0.00/32 53 (Be1)} g5 {-0.22/27 22} 20.
h3 {0.00/34 43 (Be1)} Rd8 {-0.04/27 36} 21. Be1 {0.00/36 29} Nc4 {-0.10/29 22}
22. Bxc4 {0.00/28 2} dxc4 {-0.07/28 9} 23. Rxa7+ {0.00/35 20} Kb8 {-0.05/28 9}
24. Ra5 {0.00/37 82} Rd1 {-0.22/29 32 (e4)} 25. Kf2 {0.00/35 15} Rc1 {-0.20/25
10} 26. c3 {0.00/35 15} Rc2+ {-0.27/25 9 (Ra1)} 27. Kf1 {0.00/36 17 (Ke3)} e4 {
-0.37/25 8 (Kb7)} 28. fxe4 {0.00/35 24 (Bg3+)} Rxe4 {-0.26/27 14} 29. Bg3+ {0.
00/36 15} Kb7 {-0.31/32 31} 30. Rb5+ {0.00/39 28} Kc8 {-0.38/32 95 (Kc6)} 31.
Rc5+ {0.00/42 77} Kd7 {-0.38/32 25} 32. Re5 {0.00/45 14} Rxe5 {-0.15/32 23} 33.
Bxe5 {0.00/47 14} Ra2 {-0.03/32 22 (Kc6)} 34. a5 {0.00/52 14} h5 {-0.03/33 26
(Kc6)} 35. Kg1 {0.00/49 17} g4 {-0.03/37 24 (Kc6)} 36. hxg4 {0.00/49 20 (Kh2)}
hxg4 {0.01/39 23} 37. Kh2 {0.00/47 2} Re2 {0.01/40 18 (Rd2)} 38. Bg7 {0.00/55
19 (Bf4)} Re3 {0.01/39 17} 39. Kg1 {0.00/53 2} Re2 {0.01/43 33} 40. Kh2 {0.00/
70 28} Kc6 {0.01/41 18} 41. Kg3 {0.00/57 19} Kb5 {0.01/44 22} 42. Bd4 {0.00/51
2} Rd2 {0.01/45 18 (Re4)} 43. Be5 {0.00/68 16 (Bf6)} Rc2 {0.01/48 34 (Re2)} 44.
Bf6 {0.00/55 28} Rb2 {0.01/47 11 (Re2)} 45. Kxg4 {0.00/63 21 (Be5)} Rxg2+ {0.
01/44 6} 46. Kf5 {0.00/67 13} Rd2 {0.01/48 17 (Re2)} 47. Ke4 {0.00/79 13 (Be5)}
Rd7 {0.00/46 17 (Re2+)} 48. Bd4 {0.00/78 13} Rf7 {0.00/42 8 (Re7+)} 49. Be5 {
0.00/78 13 (Ke5)} Rf8 {0.00/41 9} 50. Bd6 {0.00/78 24 (Bf4)} Rd8 {0.01/49 14
(Re8+)} 51. Bc5 {0.00/73 13 (Be5)} Rg8 {0.01/45 33 (Rd3)} 52. Bf2 {0.00/68 12
(Kd5)} Rb8 {0.00/47 46 (Re8+)} 53. Bg3 {0.00/75 12 (Bd4)} Rh8 {0.00/40 4 (Re8+)
} 54. Be5 {0.00/86 21} Re8 {0.01/43 3 (Rf8)} 55. Kd5 {0.00/75 12} Rg8 {0.01/46
4 (Rd8+)} 56. Bd4 {0.00/75 35} Rd8+ {0.00/47 12 (Rg5+)} 57. Ke4 {0.00/73 11
(Ke5)} Rd6 {0.01/47 7 (Re8+)} 58. Be5 {0.00/83 15 (Ke5)} Rd1 {0.01/46 9 (Rd7)}
59. Bd4 {0.00/86 11 (Bf6)} Ra1 {0.00/49 10 (Rd3)} 60. Kf3 {0.00/80 12 (Kf5)}
Re1 {0.01/46 24} 61. Kf2 {0.00/87 11 (Be3)} Re4 {0.01/47 6 (Rh1)} 62. Kf3 {0.
00/85 11 (Be3)} Rxd4 {0.00/45 2 (Re7)} 63. cxd4 {0.00/97 11} Kxb4 {0.00/57 15}
64. a6 {0.00/46 17} c3 {0.00/22 3} 65. a7 {0.00/46 11} c2 {0.00/23 3} 66. d5 {
0.00/48 11 (a8Q)} c1=Q {0.00/31 4} 67. a8=Q {0.00/1 0 Draw accepted} 1/2-1/2[/pgn]

[pgn][Event "The Bishop Pair + Pawn vs The Exchange, Rapid 15m+10s"]
[Site "EXPERT-PC"]
[Date "2015.05.09"]
[Round "1"]
[White "Stockfish 070515 64 BMI2"]
[Black "Komodo 9.01 64-bit"]
[Result "1/2-1/2"]
[Annotator "-0.44;-0.63"]
[SetUp "1"]
[FEN "1n2k2r/ppppp1pp/8/8/8/8/PPPPPPPP/2B1KB2 w k - 0 1"]
[PlyCount "149"]
[TimeControl "900+10"]

1. d4 {-0.44/30 57 Both last book move} e6 {-0.63/23 20} 2. e4 {-0.37/26 15
(e3)} d6 {-0.61/23 26 (Nc6)} 3. Be3 {-0.39/29 15} Nd7 {-0.60/24 34} 4. Be2 {-0.
40/25 15} Kf7 {-0.61/26 78 (Ke7)} 5. Kd2 {-0.41/25 23} Rd8 {-0.59/25 24 (Rc8)}
6. f3 {-0.36/27 15} h6 {-0.61/24 19 (c6)} 7. c3 {-0.31/27 58 (b3)} c5 {-0.61/
27 27} 8. h4 {-0.28/30 92 (dxc5)} Ke7 {-0.59/23 21 (Rc8)} 9. h5 {-0.26/30 27
(g4)} e5 {-0.57/27 47 (a6)} 10. g4 {-0.38/31 56 (f4)} Nf8 {-0.73/26 26 (a6)}
11. d5 {-0.47/36 40 (Bf2)} Nh7 {-1.03/30 34} 12. f4 {-0.63/38 149} exf4 {-1.03/
30 14} 13. Bxf4 {-0.74/40 29} Ng5 {-1.13/31 20 (Nf6)} 14. Ke3 {-0.71/34 23} Nf7
{-1.07/30 21} 15. Bg3 {-0.65/37 43 (a3)} Rf8 {-1.15/31 21 (Rb8)} 16. b3 {-0.71/
38 60} Kd7 {-1.16/30 12} 17. a3 {-0.71/38 11 (Bh4)} Kc7 {-1.19/32 22 (Ne5)} 18.
a4 {-0.70/39 30 (Bh4)} b6 {-1.20/32 23 (Ne5)} 19. Bf4 {-0.70/44 24 (Bb5)} Rh8 {
-1.21/36 65 (Re8)} 20. Bg3 {-0.70/45 11} Ne5 {-1.21/34 13} 21. Bf4 {-0.84/44
120} g5 {-1.21/36 30} 22. hxg6 {-0.72/44 10} Nxg6 {-1.22/35 14} 23. Bg3 {-0.72/
44 10} Rg8 {-1.21/34 25 (Ne5)} 24. Bf2 {-0.72/41 10 (Be1)} a5 {-1.29/31 10
(Ne5)} 25. c4 {-0.66/47 10 (Bg3)} Rf8 {-1.31/40 34 (Ne5)} 26. Be1 {-0.66/47 11
(Bg3)} Ne5 {-1.32/38 36 (Kb7)} 27. Bd2 {-0.66/47 11 (Bf2)} Kd7 {-1.34/36 15
(Rb8)} 28. Be1 {-0.66/44 11} Rh8 {-1.34/37 35 (Rg8)} 29. Kf4 {-0.66/45 11} Rg8
{-1.33/36 41 (Kc7)} 30. Bd2 {-0.66/42 11 (Bc3)} Nf7 {-1.34/36 19 (Ke7)} 31. Bc3
{-0.66/45 17} Ke7 {-1.35/35 16} 32. Bb2 {-0.66/39 3 (Bd3)} Ne5 {-1.34/34 18}
33. Bc3 {-0.66/45 12} Rg5 {-1.34/38 20 (Rf8+)} 34. Bd2 {-0.66/43 12} Rg6 {-1.
35/37 27 (Kf6)} 35. Bc3 {-0.66/46 12} Rg7 {-1.35/36 12 (Rf6+)} 36. Be1 {-0.66/
43 12 (Bb2)} Rf7+ {-1.34/38 40 (Kf7)} 37. Kg3 {-0.66/45 12} Rf6 {-1.35/40 33
(Rf8)} 38. Bc3 {-0.66/47 12 (Bd2)} Rf8 {-1.36/34 10} 39. Bd2 {-0.66/42 16} Nf7
{-1.35/35 12} 40. Kf4 {-0.66/45 12 (Bf4)} Rc8 {-1.36/33 39 (Rg8)} 41. Be1 {-0.
67/45 12 (Bc3)} Ne5 {-1.36/33 9 (Re8)} 42. Bg3 {-0.67/46 12 (Bd2)} Rf8+ {-1.36/
36 17 (Rh8)} 43. Ke3 {-0.67/1 0} Rf7 {-1.36/39 85} 44. Bh4+ {-0.67/45 16} Ke8 {
-1.37/39 14} 45. Bf2 {-0.67/47 12 (Bg3)} Kd8 {-1.37/38 15 (Rg7)} 46. Be1 {-0.
66/46 12} Kc8 {-1.38/40 28 (Kc7)} 47. Bg3 {-0.67/50 12} Kc7 {-1.38/40 18 (Kd7)}
48. Be1 {-0.67/48 12 (Bf2)} Kb8 {-1.38/38 58 (Ng6)} 49. Bg3 {-0.67/50 12} Kc8 {
-1.38/34 7 (Kb7)} 50. Bf2 {-0.62/43 12 (Be1)} Kd7 {-1.37/35 8 (Rg7)} 51. Bg3 {
-0.58/43 12 (Be1)} Ng6 {-1.37/36 19} 52. Bf3 {-0.53/43 22 (Be1)} Rf6 {-1.37/37
14 (Kc7)} 53. Bf2 {-0.47/43 19 (Be2)} Kc7 {-1.31/38 17 (Ne5)} 54. Be1 {-0.62/
43 87 (Be2)} Ne5 {-1.32/36 13} 55. Be2 {-0.42/38 12} Kb7 {-1.14/37 20 (Kd7)}
56. Bh4 {-0.12/42 16 (Bc3)} Rf7 {-1.21/37 48} 57. Bf2 {0.00/44 14 (Be1)} Rg7 {
-1.19/35 12} 58. Kf4 {-0.30/43 41} Rg8 {-1.11/33 24 (Ng6+)} 59. Be1 {-0.30/40 7
} Rf8+ {-1.03/31 11 (Nf7)} 60. Ke3 {0.00/39 9} Nf7 {-0.99/29 6 (Kc7)} 61. Bg3 {
0.00/46 18 (Bc3)} Rg8 {-0.77/28 5 (Kc7)} 62. Be1 {0.00/46 18} Kc8 {-0.59/27 11
(Kc7)} 63. Kf4 {0.00/40 6} Ne5 {-0.63/25 3} 64. Bc3 {0.00/42 6} Kc7 {-0.29/25
7 (Rd8)} 65. Be1 {0.00/42 7 (Bb2)} Rf8+ {-0.06/25 6} 66. Kg3 {0.00/44 7} Nf7 {
0.02/35 12 (Rf6)} 67. Kf3 {0.00/43 7 (Kf4)} Rg8 {0.02/35 11 (Ne5+)} 68. Ke3 {
0.00/46 7 (Bc3)} Kb7 {0.02/36 7 (Ne5)} 69. Kf4 {0.00/47 7} Kc8 {0.02/38 11
(Ne5)} 70. Bg3 {0.00/43 7 (Bc3)} Re8 {0.02/36 6 (Ne5)} 71. Ke3 {0.00/47 7} Kb7
{0.02/40 12 (Kc7)} 72. Be1 {0.00/51 8 (Bd3)} Rg8 {0.02/44 15} 73. Kf4 {0.00/69
11} Ne5 {0.02/33 3} 74. Bc3 {0.00/50 8 (Bd2)} Ka7 {0.02/41 21 (Rf8+)} 75. Ke3 {
0.00/48 12 Draw accepted} 1/2-1/2

[/pgn]

[pgn][Event "EXPERT-PC, Slow 90m+30s"]
[Site "EXPERT-PC"]
[Date "2015.05.10"]
[Round "1"]
[White "Komodo 9.01 64-bit"]
[Black "Stockfish 090515 64 BMI2"]
[Result "0-1"]
[Annotator "-0.54;-0.39"]
[SetUp "1"]
[FEN "1n2k2r/pppp1ppp/8/8/8/8/PPPPPPPP/2B1KB2 w k - 0 1"]
[PlyCount "72"]
[TimeControl "5400+30"]

{Intel(R) Core(TM) i7-5960X CPU @ 3.00GHz 2300 MHz  W=33.0 plies; 21 475kN/s;
342 953 257 TBAs  B=39.9 plies; 22 858kN/s; 38 186 419 TBAs} 1. e4 {-0.54/26
126 Both last book move} Nc6 {-0.39/33 100} 2. d3 {-0.57/28 156 (c3)} f5 {-0.
44/30 79 (Ne7)} 3. Be3 {-0.45/29 158 (c3)} Ne7 {-0.41/31 74} 4. c4 {-0.48/27
112 (g3)} b6 {-0.34/31 135 (d6)} 5. Be2 {-0.46/29 324 (Kd2)} d6 {-0.35/33 150}
6. f4 {-0.50/30 190 (Kd2)} Kd7 {-0.37/36 147 (g6)} 7. Bf3 {-0.49/29 137} c5 {
-0.37/34 24} 8. a3 {-0.51/31 348} g6 {-0.38/33 143} 9. Kd2 {-0.53/30 155} Rf8 {
-0.41/37 117 (Re8)} 10. b4 {-0.53/30 135 (Kc3)} Nc6 {-0.74/40 76} 11. Kc3 {-0.
58/33 68 (exf5)} a5 {-0.57/40 148 (fxe4)} 12. b5 {-0.99/34 267} Nd4 {-0.54/41
18} 13. Bxd4 {-1.09/35 128 (h4)} cxd4+ {-0.98/41 108} 14. Kxd4 {-1.10/35 35}
fxe4 {-1.04/41 12} 15. Kxe4 {-1.13/33 84 (Bg4+)} Re8+ {-1.12/44 131} 16. Kd4 {
-1.14/35 58} Re1 {-1.13/43 80} 17. Kc3 {-1.15/34 120} Ke6 {-1.25/45 367} 18.
Bd5+ {-1.15/33 78 (Bg4+)} Kf6 {-1.26/45 140 (Ke7)} 19. Bf3 {-1.22/34 135 (Be4)}
Rh1 {-1.53/44 243 (Ra1)} 20. h3 {-1.25/35 93} Rf1 {-1.55/40 77 (Rc1+)} 21. Kb2
{-1.43/30 159 (a4)} Kf5 {-1.85/41 233} 22. d4 {-1.42/31 50} Ke6 {-1.91/38 14}
23. Kc2 {-1.63/30 197 (Kb3)} Re1 {-1.90/39 219 (Ra1)} 24. Bg4+ {-1.54/32 122
(a4)} Ke7 {-2.34/42 180} 25. Bd1 {-1.94/35 318} a4 {-2.75/40 127 (Rg1)} 26. Kd2
{-2.39/31 146} Rg1 {-3.19/41 147} 27. g4 {-2.65/32 132} Rg2+ {-3.24/37 14} 28.
Kc3 {-2.76/35 321} Rg3+ {-4.02/40 117} 29. Kb4 {-3.05/35 199} Rd3 {-4.10/39 11}
30. Be2 {-3.56/37 224 (Bxa4)} Rxd4 {-5.20/42 116} 31. f5 {-3.84/39 161 (h4)}
gxf5 {-9.85/49 444} 32. gxf5 {-3.96/38 54} Rh4 {-10.56/33 11} 33. Bf1 {-5.40/
37 92} Kf6 {-11.57/45 105 (d5)} 34. Kxa4 {-10.13/37 223 (Bg2)} d5 {-13.25/51
105} 35. Kb4 {-250.00/36 41} dxc4 {-13.69/45 27} 36. Kc3 {-250.00/43 301 (a4)}
Kxf5 {-16.05/49 105} 0-1

[/pgn]

descriptionComplex positions & engine evaluation EmptyResearch

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[rn2k2r/ppppp1pp/8/8/8/8/PPPPPPPP/2B1KB1R w Kkq - 0 1]

Complex positions & engine evaluation 2111

30 games with each color.




It looks like black's slight advantage is close to negligible at this level of performance. The pair grants white a long lasting initiative.

When the side down the Exchange has the bishop pair, my data shows he needs only 1.15 pawns to make things even.

Complex positions & engine evaluation Phpcu710 [/b]

Adding the better cooperation of the rook with the bishops, many Soviet theoreticians believed that, in active positions, rook and two bishops outperform two rooks and a knight.

In practice, one pawn may be sufficient compensation for the loss of exchange, while two pawns almost always are.

Complex positions & engine evaluation Rbb_rr10

Last edited by QueensideCastler on Sat May 23, 2015 9:36 am; edited 5 times in total (Reason for editing : Edited)

descriptionComplex positions & engine evaluation EmptyRe: Complex positions & engine evaluation

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