Test Position: Avoid Qxb7

[swami]

This test position is taken from the game Lemming vs Anmon, the key move is to avoid Qxb7, Bright with its book avoids it and plays Nh4 instead.

So turn the engine book off and find if the engine really avoids this move.

[d] r2qk2r/1p1nbppp/2p1pn2/p4b2/P1BP4/1Q2PN2/NP3PPP/R1B2RK1 w kq - 0 11

[kgburcham]

[D] r2qk2r/1p1nbppp/2p1pn2/p4b2/P1BP4/1Q2PN2/NP3PPP/R1B2RK1 w kq - 0 1

Deep Fritz:

1.Nh4!
= (-0.12) Depth: 17/44 00:13:57 5033mN
1.Nh4 Bg6 2.Nxg6 hxg6 3.Nc3 Qc7 4.f4 Rd8 5.h3 Qb6 6.Qc2 Nd5
= (-0.06) Depth: 18/47 00:23:04 8263mN

[Omega-three]

I tried deep positional analysis on the position for about 12 hous or so. All it turned up was a roughly equal position. I suppose if you reach this position against a stronger player you might be tempted to try Qxa7 which if black obliges is a perpetual draw.


[Event "5'/60"]
[Site "n/a"]
[Date "????.??.??"]
[Round "?"]
[White "New game"]
[Black "Deep Rybka 3"]
[Result "*"]
[SetUp "1"]
[FEN "r2qk2r/1p1nbppp/2p1pn2/p4b2/P1BP4/1Q2PN2/NP3PPP/R1B2RK1 w kq - 0 11"]
[PlyCount "7"]
[TimeControl "60/300:0/0:0/0"]

{512MB, Rybka3.ctg, N-3XTA4YATYOZ7W} 11. Nc3 (11. Qxb7 Rb8 (11... Be4 12. Qb3 (
12. Be2 Nb6 13. Ng5 Rb8 14. Qa7 $11 {0.00/21}) 12... Bxf3 13. gxf3 O-O 14. Nc3
$14 {0.42/18}) (11... O-O 12. Be2 (12. Qb3 Qc7 13. Nc3 Rab8 14. Qd1 $14 {0.38/
19}) 12... c5 13. Qb3 Rb8 14. Qd1 $14 {0.39/18}) 12. Qa7 (12. Qa6 Ra8 13. Qxc6
Rc8 14. Qb5 $11 {0.00/22}) 12... Ra8 13. Qb7 Rb8 14. Qa6 $11 {0.00/20}) (11.
Nh4 Bg4 (11... Be4 12. Nc3 (12. Qd1 Nb6 13. Be2 h6 14. Nc3 $11 {0.00/19}) 12...
Bd5 13. Nxd5 cxd5 14. Bd3 $11 {0.13/21}) (11... Bg6 12. f4 (12. Be2 Bh5 13. Nc3
Qb6 14. Qxb6 $11 {0.00/20}) 12... Qc7 13. Nc3 O-O 14. Nxg6 $11 {0.08/19}) 12.
h3 (12. f3 Bh5 13. g3 g5 14. Ng2 $15 {-0.29/18}) 12... Bh5 13. Qxb7 Rb8 14. Qa6
$11 {-0.13/18}) (11. Re1 Qc7 (11... Qb6 12. Nc3 (12. Qd1 O-O 13. Nc3 Bg4 14.
Bf1 $11 {-0.20/18}) 12... Qxb3 13. Bxb3 Bb4 14. Bd2 $11 {0.00/20}) (11... Nb6
12. Bf1 (12. Be2 O-O 13. Nh4 Be4 14. Nf3 $11 {-0.07/19}) 12... h6 13. Nc3 Bb4
14. Ne5 $11 {0.10/19}) 12. Nc3 (12. h3 O-O 13. Nc3 Bb4 14. Re2 $11 {-0.04/19})
12... O-O 13. h3 Bg6 14. e4 $11 {-0.03/18}) (11. Be2 Qb6 (11... Qc7 12. Nh4 (
12. Nc3 h6 13. h3 O-O 14. Rd1 $11 {-0.13/19}) 12... Ng4 13. Nf3 Bd6 14. g3 $11
{-0.10/19}) (11... Qb8 12. Nh4 (12. Nc3 h6 13. Bd1 O-O 14. Bd2 $11 {-0.14/18})
12... Ng4 13. Nf3 O-O 14. h3 $11 {0.09/20}) 12. Qxb6 (12. Qd1 h6 13. b3 O-O 14.
Bb2 $11 {-0.24/18}) 12... Nxb6 13. Nc3 O-O 14. h3 $11 {-0.15/19}) 11... Qc7 (
11... Qb6 12. Qd1 (12. Qxb6 Nxb6 13. Bb3 Bd3 14. Rd1 $11 {0.07/21}) 12... O-O
13. h3 h6 14. Qe2 $11 {0.10/17}) (11... h6 12. Qxb7 (12. Re1 Qb6 13. e4 Qxb3
14. Bxb3 $11 {0.00/19}) 12... O-O 13. Qb3 Rb8 14. Qd1 $14 {0.41/19}) 12. Re1 (
12. h3 Nb6 13. Be2 h6 14. Ne5 $11 {0.00/19}) 12... Ne4 13. Qd1 Bb4 14. Nh4 $11
{0.02/18} *