Cambridge Springs Defence
1. d4
... d5;
2. c4
... e6;
3. Nc3
... Nf6; ( c6 4 Nf3 Nf6 5 Bg5 Nbd7 6 e3 Qa5 {is another move order to get to the main position.} )
4. Bg5
... Nbd7;
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$rNbKq+ R%
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/(((((((()
Line A
5. cxd5
( 5 cxd5 exd5
a1( 6 e3 {or other moves such as Nf3 or Qc2 see QGExchange variation.})
a2 ( 6 Nxd5 ? {Blunder} Nxd5 7 Bxd8 Bb4+ 8 Qd2 Bxd2+ 9 Kxd2 Kxd8 {wins a piece} ) )
Line B
5. e4
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$rNbKq+ R%
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/(((((((()
( 5 e4 dxe4 6 Nxe4 h6 {best move}
( 7 Bh4 g5 8 Nxf6+ Nxf6 9 Bg3 Bb4+ {ouch !} )
( 7 Nxf6+ Nxf6
( 8 Bf4 c5 {equal})
( 8 Bxf6 Qxf6 9 Qd2 Bd7 10 Nf3 O-O-O
( 11 Ne5 c5 {=+} )
( 11 Be2 Bc6 {=+} ) ) ) )
Line C
5.Nf3
( 5 Nf3 c6
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$r+bKq+ R%
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$ +n+ N +%
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/(((((((()
( 6 e3 Qa5 {transposes to main line} )
( 6 Qc2 h6
( 7 Bh4 dxc4 8 e4 g5 9 Bg3 b5 {=+} )
( 7 Bxf6 Nxf6 8 e3 Be7 9 Bd3 O-O 10 O-O c5 {=} ) )
( 6 Qb3 Be7 7 e3 O-O 8 Be2 b6 9 O-O Bb7 10 Rad1 h6 11 Bh4 Ne4 12 Bxe7 Qxe7 13 Nxe4 dxe4 14 Nd2 c5 {=} )
( 6 e4 dxe4 7 Nxe4 h6
( 8 Bh4 g5 9 Nxf6+ Nxf6 10 Bg3 Bb4+ 11 Nd2 Ne4 {wins} )
( 8 Nxf6+ Nxf6
( 9 Be3 Bb4+ 10 Nd2 Ne4 {advantage Black} )
( 9 Bd2 c5 10 Bc3 Ne4 {equal} ) ) ) )
Line D
5 e3
( 5 e3 c6
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$rNbKq+ R%
$PpP + Pp%
$ + P N +%
$+ + Pp+ %
$ B +o+ +%
$+ Mo+o+ %
$oOo+m+oO%
$T VlWv+t%
/(((((((()
( 6 Bd3 Qa5
( 7 Nf3 Ne4 {transposes again} )
( 7 Ne2 dxc4 8 Bxf6 cxd3 {wins} )
( 7 Bh4 dxc4 8 Bxc4 b5
( 9 Bd3 Bb7 10 Ne2 a6 11 Bxf6 {equal} )
( 9 Bb3 Bb7 10 Nf3 c5 11 dxc5 Bxc5 12 O-O
O-O {equal} ) ) )
( 6 a3 Be7 7 Nf3 Ne4 8 Bxe7 Qxe7 9 Nxe4 dxe4 10 Nd2 f5 11 c5 O-O 12 Nc4 b6 13 b4 Ba6 14 Be2 Bxc4 15 Bxc4 a5 16 Qb3 Rfe8 17 O-O b5 18 Be2 a4 {equal} )
( 6 Qc2 Qa5
( 7 Nf3 Ne4 { ! transposes to main 7. Qc2})
( 7 Bh4 Ne4 8 Bd3 Nxc3
( 9 Qxc3 Bb4 {ouch !} )
( 9 bxc3 dxc4 10 Bxc4 c5 {equal} ) )
( 7 cxd5 Nxd5 8 e4 Nxc3 9 Bd2 Qa4 10 Qxc3 a5 11 Nf3 Bb4 12 Qc1 O-O 13 a3 Bxd2+ 14 Qxd2 e5 15 Rc1 exd4
( 16 Nxd4 Re8 17 f3 Nb6 {threat Rd8} )
( 16 Rc4 Qb5 17 Rxd4 Qc5
( 18 Be2 Qe7 {=} )
( 18 Rxd7 Bxd7 19 Qxd7 Rad8 {wins} ) ) ) )
( 6 Nf3
Qa5 { Cambridge Springs defence Main Lines.}
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$r+bKq+ R%
$PpP + Pp%
$ +nP N +%
$+ + Pp+ %
$ B +o+ W%
$+ Mo+o+ %
$oOo+m+oO%
$T Vl+v+t%
/(((((((()
( 7 Bd3 Ne4 { !})
( 7 Qb3 Ne4 { !} )
( 7 Qc2 Ne4 {!} )
( 7 a3 Ne4 { !} 8 b4 Bxb4 { !} 9 axb4 Qxb4 10 Rc1 Nxc3 11 Qd2 Na2 { ! wins Guest - Peake 2001} )
( 7 Nd2 Ne4
( 8 Nb3 Nxc3 9 Nxa5 Nxd1 10 Kxd1 Bd6 11 Rc1 O-O 12 Bd3
Bc7 13 Nb3 dxc4 14 Bxc4 e5 {equal} )
( 8 Ndxe4 dxe4
( 9 Bf4 Bb4 10 Qb3 e5 {key move}
( 11 Bxe5 Nxe5 12 dxe5 O-O {with advantage} )
( 11 dxe5 Nc5 12 Qc2 Bf5 13 Be2 Nd3+ 14 Kf1 O-O-O {with advantage} ) )
( 9 Bh4 Bb4 10 Qc2 O-O 11 Be2 e5 { !} 12 O-O exd4 13 exd4 g5 14 Bg3 f5 15 f4 g4 16 a3 Be7 17 Rad1 Nf6 18 d5 Rd8 19 Bh4 Qc7 {equal (note 19.....Nxd5 ? doesn't work 20 Rxd5
( cxd5 21 Bxe7 d4 22 Nxe4 fxe4 23 Bxd8 Qxd8 24 Qxe4 {white wins} )
( Rxd5 21 Bxe7 Rd7 22 Bb4 Qc7 23 Nxe4 fxe4 24 Qxe4 Rd8 25 f5 {advantage white} ) ) ) ) )
!""""""""#
$r+bKq+ R%
$PpP + Pp%
$ +nP N +%
$+ + Pp+ %
$ + +o+ W%
$+ Bo+o+ %
$oOo+m+oO%
$T Vl+v+t%
/(((((((()
( 7 Bxf6 Nxf6 8 Bd3 Bb4
( 9 Qb3 dxc4 10 Bxc4 O-O 11 O-O Bxc3 12 bxc3 b6 13 Ne5 Bb7 14 Be2 c5 15 Nc4 Qa6 16 Qb2 Bd5
( 17 Nd6 Qa5 18 Rfd1 Rab8 {equal} )
( 17 Ne5 Qc8 18 a4 Nd7 19 c4 Be4 20 Nxd7 Qxd7 21 dxc5 bxc5 {equal} ) )
( 9 Qc2 ( dxc4 {Improvement on Brown-Peake} 10 Bxc4 c5 11 O-O cxd4
( 12 Nxd4 O-O 13 Ne4 Be7 14 Nxf6+ Bxf6 15 Bd3 g6 {equal.})
( 12 exd4 O-O 13 a3 Bd6 14 Ne4 Be7 15 Bd3 h6 {equal} )
( 12 Bb5+ Ke7
( 13 exd4 Bxc3 {wins} )
( 13 Nxd4 Bxc3 14 Qxc3 Qxc3 15 bxc3 Rd8 {=+} ) ) )
( 7 cxd5 Nxd5
!""""""""#
$r+bKq+ R%
$PpP + Pp%
$ +nP N +%
$+ + P + %
$ B +m+ W%
$+ +o+o+ %
$oOo+m+oO%
$T Vl+v+t%
/(((((((()
( 8 Qb3 Bb4 9 Rc1 e5 {the key move}
( 10 Nxe5 Nxe5 11 dxe5 Be6 {equal} )
( 10 Bc4 exd4 11 Bxd5 Bxc3+ 12 bxc3 cxd5 13 exd4 O-O
14 O-O Nb6 {equal})
( 10 dxe5 Nc5 { !} 11 Qc2 h6 12 Bh4 Na4 {pressure !} 13 Bc4 Naxc3 14 bxc3 Bxc3+ 15 Nd2 Bf5 {white is in trouble}
( 16 Bd3 Nb4 17 Qxc3 Nxd3+
( 18 Ke2 Nxc1+ {wins} )
( 18 Kf1 Qa6 ) )
( 16 Qd1 Qb4
( 17 Bb3 Qxh4 {that's why h6 played !} )
( 17 Bxd5 cxd5 18 e6 Bxe6 19 Bg3 Rc8 {wins} ) ) ) )
( 8 Qd2 N7b6
( 9 e4 Nxc3 10 bxc3 Na4
( 11 Rc1 Nxc3 { !=+} )
( 11 Bd3 Qxc3 12 Qxc3 Nxc3 {=+} ) )
( 9 Nxd5 Qxd2+ 10 Nxd2 exd5 11 Bd3 a5 12 a4 Bb4 13 Ke2 Bg4+ 14 f3 Bh5 15 h4 O-O 16 g4 Bg6 17 b3 Bxd3+ 18 Kxd3 Rfe8 19 Rac1 c5 20 Bf4 Rac8 21 dxc5 Nd7 22 c6 bxc6 23 Rhe1 Nc5+ 24 Kc2 f6 25 Nf1 Ne6 26 Bg3 Red8 27 Bf2 c5 28 Nd2 c4 29 bxc4 Nc5 30 e4 d4 31 Nb1 d3+ 32 Kb2 d2 {0-1 Karpov - Kasparov WCH 1985} )
( 9 Bd3 Nxc3 10 bxc3 Nd5
( 11 O-O Qxc3 12 Qe2 Bd6
( 13 Rac1 Qa5 14 Bb1 Nc3 15 Qd2 Bb4 {=+} )
( 13 Nd2 Qa5 14 f4 Qc7 15 Bh4 O-O 16 Rac1 Bd7{=+})
( 11 Rc1 Nxc3 12 O-O Bb4 13 a3 Qxa3 14 Ra1 Qb3
( 15 Ne5 O-O 16 Bc4 Ne4 17 Qe2 Qc3 18 Rac1 Qd2 19 Qg4 Nxg5 20 Rcd1 Qc3 21 Rc1 Qd2 {drawn} )
( 15 Rfc1 Na2 16 Qxa2 Qxd3 17 d5 O-O 18 dxc6 bxc6 19 Rxc6 Bb7 20 Rc7 Bxf3 21 gxf3 Qg6 {ouch -+} ) ) ) ) ) ) )