OpenChess

r2nr1k1/2qbb1np/p2p1ppB/1ppPp3/4P1P1/2P2NNP/PPB2P1K/R2Q2R1 w - - 0 20
Found this in Rochade Europa, Nov 2011. Game is http://www.chessgames.com/perl/chessgame?gid=1358466
Board full of pieces, they agree to a draw... but White has a move that gives a definite advantage.
I like this a test position, as I think one can actually see (as a human) that the right move should work, rather than being something speculative, that just happens to be sound.

Komodo 4 x64 (AMD Phenom @ 3000 MHz) 1 core, 512 MB hash:

1 +0.45 1.Be3 Nf7 (0.00)
2 +0.56 1.g5 fxg5 2.Nxg5 (0.00)
3 +0.48 1.g5 fxg5 2.Nxg5 Rf8 3.Rg2 (0.00)
4 +0.38 1.g5 fxg5 2.Nxg5 Rf8 3.Qe2 Nf7 (0.00)
5 +0.22 1.g5 fxg5 (0.00)
5 +0.42 1.Be3 Nf7 2.Qe2 Rad8 3.Rad1 c4 (0.00)
6 +0.35 1.Be3 Nf7 2.Qe2 c4 3.a4 h5 4.gxh5 (0.01)
7 +0.26 1.Be3 Nf7 2.Qe2 c4 3.a4 Red8 4.axb5 axb5 5.Rxa8 Rxa8 (0.01)
7 +0.37 1.Re1 Nf7 2.Be3 c4 3.Qe2 Rf8 4.Rad1 Ng5 5.Nxg5 (0.01)
7 +0.40 1.Qe2 Nf7 2.Be3 c4 3.Rad1 Rad8 4.Rge1 (0.01)
8 +0.37 1.Qe2 Nf7 2.Be3 c4 3.a4 Red8 4.Rgf1 Ne8 5.axb5 axb5 (0.02)
9 +0.36 1.Qe2 Nf7 2.Be3 c4 3.a4 Red8 4.axb5 axb5 5.Rge1 Rxa1 6.Rxa1 (0.03)
10 +0.34 1.Qe2 Nf7 2.Be3 c4 3.a4 Red8 4.Rgd1 Ne8 5.Re1 Ng5 6.Nxg5 fxg5 7.axb5 (0.05)
11 +0.32 1.Qe2 Rb8 2.Be3 c4 3.Rad1 b4 4.cxb4 Rxb4 5.b3 c3 6.Qxa6 Nf7 7.a4 Bc8 (0.13)
11 +0.35 1.Be3 Nf7 2.a4 c4 3.Qd2 Reb8 4.Rge1 Ne8 5.Nf1 bxa4 6.Bxa4 Bxa4 7.Rxa4 (0.16)
12 +0.30 1.Be3 Rb8 2.b4 Nf7 3.a4 cxb4 4.cxb4 Qc4 5.axb5 Bxb5 6.Qd2 Rec8 7.Rgc1 Qc3 8.Qxc3 Rxc3 (0.30)
12 +0.33 1.Bd2 Nf7 2.a4 c4 3.Be3 Rf8 4.Qc1 Rfb8 5.Qd2 Ne8 6.Rge1 bxa4 7.Bxa4 Bxa4 8.Rxa4 (0.36)
12 +0.35 1.a4 Nf7 2.Be3 Reb8 3.a5 b4 4.c4 Rf8 5.Qd3 Ne8 6.Kh1 Ng5 7.Nxg5 fxg5 (0.47)
13 +0.32 1.a4 Nf7 2.Bd2 c4 3.Be3 Rf8 4.Qc1 Rfb8 5.Qd2 Ne8 6.Rge1 Rc8 7.Qe2 Rd8 (0.64)
14 +0.27 1.a4 Nf7 2.Bd2 c4 3.Be3 Reb8 4.Qd2 Ne8 5.Rge1 Bf8 6.axb5 axb5 7.b4 Bg7 8.Qe2 Rxa1 9.Rxa1 (0.94)
14 +0.28 1.Be3 Nf7 2.Qe2 c4 3.a4 Reb8 4.a5 Rf8 5.Kh1 Ng5 6.Nxg5 fxg5 7.f3 Ne8 8.Bb6 Qb7 (1.21)
15 +0.31 1.Be3 Nf7 2.Qe2 c4 3.a4 Reb8 4.Rgc1 Ng5 5.Nxg5 fxg5 6.b4 Ne8 7.a5 h6 8.Bb6 Qb7 9.Qf3 (1.67)
16 +0.34 1.Be3 Nf7 2.a4 Rf8 3.Qe2 Ng5 4.Rge1 c4 5.Nxg5 fxg5 6.f3 h6 7.Qf2 Qb7 8.axb5 axb5 9.Bb6 Ne8 10.Rxa8 Qxa8 (4.58)
17 +0.26 1.Be3 Nf7 2.a4 Reb8 3.Qe2 c4 4.Qd2 Ne8 5.Ra2 Qb7 6.Rc1 b4 7.cxb4 Qxb4 8.a5 Qxd2 9.Bxd2 Rb7 10.Kg2 Rab8 11.Ba4 Bxa4 (8.62)
18 +0.26 1.Be3 Nf7 2.a4 Reb8 3.Qe2 c4 4.Qd2 Ne8 5.Ra2 Qb7 6.Rc1 b4 7.cxb4 Qxb4 8.a5 Qxd2 9.Bxd2 Rb7 10.Kg2 Rc8 11.Ne2 (11.02)
19 +0.32 1.Be3 Nf7 2.a4 Reb8 3.Qe2 c4 4.Qd2 Ne8 5.Ra2 Qb7 6.b3 a5 7.axb5 Bxb5 8.Rb1 cxb3 9.Rxb3 Qd7 10.Qc1 a4 11.Rb4 Nc7 (18.13)
20 +0.29 1.Be3 Nf7 2.a4 Rec8 3.Qe2 Ne8 4.Rgc1 Qb7 5.b3 Ng5 6.a5 b4 7.c4 h6 8.Bd3 Bf8 9.Nxg5 hxg5 10.f3 Bg7 11.Rd1 (38.79)
20 +0.48 1.Nh5 (45.04)
20 +0.95 1.Nh5 (49.95)
20 +1.18 1.Nh5 Nxh5 2.gxh5 Nf7 3.hxg6 Nxh6 4.Nh4 Kg7 5.gxh7+ Kxh7 6.Rg6 Rg8 7.Qh5 Bf8 8.Rxg8 Kxg8 9.Rg1+ Ng4+ 10.hxg4 Be8 11.Qf5 Qh7 12.Qxh7+ Kxh7 13.Nf5 Bd7 14.Kg3 Bxf5 15.Rh1+ Bh6 16.exf5 Rg8 17.Be4 c4 18.Kf3 Kg7 (54.04)
21 +1.09 1.Nh5 Nxh5 2.gxh5 Nf7 3.hxg6 Nxh6 4.Nh4 Kg7 5.gxh7+ Kxh7 6.Rg6 Rg8 7.Qh5 Bf8 8.Rxg8 Kxg8 9.Rg1+ Ng4+ 10.hxg4 Be8 11.Qf5 Qh7 12.Qxh7+ Kxh7 13.Nf5 Bd7 14.Kh3 c4 15.Bd1 Bxf5 16.gxf5 Bh6 17.Rg6 Rf8 18.Be2 Bc1 19.b4 Bd2 (57.59)
22 +1.09 1.Nh5 Nxh5 2.gxh5 Nf7 3.hxg6 Nxh6 4.Nh4 Kg7 5.gxh7+ Kxh7 6.Rg6 Rg8 7.Qh5 Bf8 8.Rxg8 Kxg8 9.Rg1+ Ng4+ 10.hxg4 Be8 11.Qf5 Qh7 12.Kg3 Qg7 13.Qf3 Qg5 14.Qe3 Qxe3+ 15.fxe3 Bd7 16.Nf5 Bxf5 17.exf5 Bh6 18.Kf3 Kf7 19.Rh1 Rh8 20.Ke4 c4 (63.24)
23 +1.19 1.Nh5 Nxh5 2.gxh5 Nf7 3.hxg6 Nxh6 4.Nh4 Kg7 5.gxh7+ Kxh7 6.Rg6 Rg8 7.Qh5 Bf8 8.Rxg8 Kxg8 9.Rg1+ Ng4+ 10.hxg4 Be8 11.Qf5 Qh7 12.Qxh7+ Kxh7 13.Kg3 Bd7 14.a4 bxa4 15.Ra1 Rb8 16.Bxa4 Bc8 17.Ra2 Bh6 18.Nf5 Bxf5 19.gxf5 Kg7 20.Bc6 Bd2 21.Kg4 Bc1 (75.70)
24 +1.35 1.Nh5 (102.12)
24 +1.34 1.Nh5 Nxh5 (107.19)
24 +1.58 1.Nh5 Nxh5 2.gxh5 Nf7 3.hxg6 Nxh6 4.Nh4 Kg7 5.gxh7+ Kxh7 6.Qh5 Rg8 7.Rg6 Bf8 8.Rxg8 Kxg8 9.Rg1+ Ng4+ 10.hxg4 Bg7 11.g5 Rf8 12.g6 Re8 13.Rh1 Qc8 14.Nf5 Bxf5 15.exf5 Kf8 16.Kg2 c4 17.Be4 Ke7 18.Qh7 Rg8 19.a3 Qe8 20.Qh4 (160.39)
25 +1.60 1.Nh5 Nxh5 2.gxh5 Nf7 3.hxg6 Nxh6 4.Nh4 Kg7 5.gxh7+ Kxh7 6.Qh5 Rg8 7.Rg6 Bf8 8.Rxg8 Kxg8 9.Rg1+ Ng4+ 10.hxg4 Bg7 11.g5 Rf8 12.g6 Re8 13.Rh1 Qc8 14.Nf5 Bxf5 15.exf5 Kf8 16.Kg2 c4 17.Be4 Ke7 18.Qg4 Rh8 19.Rh7 Rxh7 20.gxh7 Qh8 21.Qg6 Kf8 (236.73)
26 +1.45 1.Nh5 Nxh5 2.gxh5 Nf7 3.hxg6 Nxh6 4.Nh4 Kg7 5.gxh7+ Kxh7 6.Qh5 Rg8 7.Rg6 Bf8 8.Rxg8 Kxg8 9.Rg1+ Ng4+ 10.hxg4 Be8 11.Qf5 Qh7 12.Qe6+ Kg7 13.Kg3 Bf7 14.Qd7 Kg8 15.Qb7 Rd8 16.Nf5 Bg6 17.Qxa6 Bxf5 18.gxf5 Kf7 19.Kg2 Be7 20.Kf1 Qh3+ 21.Ke1 Qh2 22.Rf1 Rb8 23.Qa7 (268.44)
27 +1.61 1.Nh5 (373.16)
27 +1.60 1.Nh5 Nxh5 (390.17)
27 +1.54 1.Nh5 Nxh5 2.gxh5 Nf7 3.hxg6 Nxh6 4.Nh4 Kg7 5.gxh7+ Kxh7 6.Rg6 Rg8 7.Qh5 Bf8 8.Rxg8 Kxg8 9.Rg1+ Ng4+ 10.hxg4 Be8 11.Qf5 Qh7 12.Qe6+ Kg7 13.Kg3 Bf7 14.Qd7 Kg8 15.Qb7 Rd8 16.Qxa6 Bxd5 17.Nf5 Qb7 18.Qxb7 Bxb7 19.Rh1 Ra8 20.Rd1 Ra6 21.a3 Kf7 22.Rh1 Bc8 23.Rh7+ Kg6 24.Rh8 Bxf5 25.gxf5+ Kf7 (433.64)
28 +1.46 1.Nh5 Nxh5 2.gxh5 Nf7 3.hxg6 Nxh6 4.Nh4 Kg7 5.gxh7+ Kxh7 6.Rg6 Rg8 7.Qh5 Bf8 8.Rxg8 Kxg8 9.Rg1+ Ng4+ 10.hxg4 Be8 11.Qf5 Qh7 12.Qe6+ Kg7 13.Kg3 Bf7 14.Qd7 Kg8 15.a3 Qh6 16.g5 fxg5 17.Nf5 Qf6 18.Qb7 Qd8 19.Rh1 Qb8 20.Qxb8 Rxb8 21.Kg4 b4 22.axb4 cxb4 23.Kxg5 bxc3 24.bxc3 Be8 25.Kf6 Rb2 26.Rg1+ Kh7 (546.12)
29 +1.53 1.Nh5 Nxh5 2.gxh5 Nf7 3.hxg6 Nxh6 4.Nh4 Kg7 5.gxh7+ Kxh7 6.Rg6 Rg8 7.Qh5 Bf8 8.Rxg8 Kxg8 9.Rg1+ Ng4+ 10.hxg4 Be8 11.Qf5 Qh7 12.Qe6+ Kg7 13.Kg3 Bf7 14.Qd7 Kg8 15.Qb7 Rd8 16.Nf5 Bg6 17.Qxa6 Rd7 18.Qxb5 Rb7 19.Qe2 Bxf5 20.exf5 Rxb2 21.a4 Qh6 22.Kg2 Qf4 23.Ra1 Rxc2 24.Qxc2 Qxg4+ 25.Kf1 Qc4+ 26.Kg1 Qxd5 27.a5 Kf7 (739.79)
30 +1.52 1.Nh5 Nxh5 2.gxh5 Nf7 3.hxg6 Nxh6 4.Nh4 Kg7 5.gxh7+ Kxh7 6.Rg6 Rg8 7.Qh5 Bf8 8.Rxg8 Kxg8 9.Rg1+ Ng4+ 10.hxg4 Be8 11.Qf5 Qh7 12.Qe6+ Kg7 13.Kg3 Bf7 14.Qd7 Kg8 15.Qb7 Rd8 16.f3 Qh6 17.g5 fxg5 18.Nf5 Qf6 19.Qxa6 Be8 20.Kf2 Bd7 21.Qb6 Bg7 22.Qc7 Bxf5 23.exf5 Ra8 24.a3 Rf8 25.Qd7 Qh6 26.Qe6+ Rf7 27.Qxh6 Bxh6 (1064.25)
31 +1.52 1.Nh5 Nxh5 2.gxh5 Nf7 3.hxg6 Nxh6 4.Nh4 Kg7 5.gxh7+ Kxh7 6.Rg6 Rg8 7.Qh5 Bf8 8.Rxg8 Kxg8 9.Rg1+ Ng4+ 10.hxg4 Be8 11.Qf5 Qh7 12.Qe6+ Kg7 13.Kg3 Bf7 14.Qd7 Kg8 15.Qb7 Rd8 16.f3 Qh6 17.g5 fxg5 18.Nf5 Qf6 19.Qxa6 Be8 20.Kf2 Bd7 21.Qb6 c4 22.Qe3 Bxf5 23.Qxg5+ Qxg5 24.Rxg5+ Bg7 25.Rxf5 Bh6 26.a4 bxa4 27.Rh5 (1793.91)