outAtime wrote:I find it difficult to see what would cause this switch since the knight appears well posted on the central square, PST etc would make it difficult to move Ng6. Any ideas? How do these engines decide to switch from Bd7 to Ng6?
Well, I have no idea why it does it, but Jazz does switch to Ng6 at 11 ply and seems to stick with it. Note that it seems to badly misevaluate the position (based on the evaluation by stronger engines posted earlier), or at least not like it very much for black, with a score around -0.5.
[ 1] -1.02 0.00 0 (EBR = 0.00) 0 / 0 Nxf3
[ 2] -0.46 0.00 384 (EBR = 20.34) 4 / 0 Nxf3 Rxf3 Bd4 Kh2
[ 3] -0.05 0.01 1002 (EBR = 1.42) 5 / 0 Nxf3 Rxf3 Bd4 Kh2 Qe1
[ 4] -0.42 0.03 4490 (EBR = 4.91) 6 / 0 Nxf3 Rxf3 Bd4 Kh2 Qe1 Re2
[ 5] -0.49 0.07 17902 (EBR = 2.10) 7 / 0 Nxf3 Rxf3 Bd4 Kf1 Kh8 Re2 Qd8
[ 6] -0.64 0.10 34021 (EBR = 0.80) 8 / 0 Nxf3 Rxf3 Bd4 Kf1 Re8 Re2 Be5 Re3
[ 7] -0.61 0.16 70705 (EBR = 1.87) 9 / 0 Nxf3 Rxf3 Bd4 Kg2 Re8 Nb5 Be5 Bxe5 dxe5
[ 8] -0.77 0.26 131229 (EBR = 1.54) 10 / 0 Nxf3 Rxf3 Bd4 Kg2 Re8 Nb5 Be5 Bxe5 dxe5 Rd3
[ 9] -0.77 0.45 272995 (EBR = 2.01) 11 / 0 Nxf3 Rxf3 Bd4 Kh2 Qe1 Qd1 Qxd1 Rxd1 Rf6 Re1 Rg6
[10] -0.72 0.77 525615 (EBR = 1.68) 12 / 3 Nxf3 Rxf3 Bd4 Kh2 Re8 Nb5 Be5 Bxe5 dxe5 Rd3 f4 Nc3 fxg3 Rxg3 Kh8
<11> 4.66 3680762 -0.81 -> -0.57 13 / 0 Ng6 Ne2 Nxf4 Nxf4 Qg5 Bh5 Be5 h4 Qh6 Rg2 Kh8
[11] -0.57 4.78 3775344 (EBR = 12.47) 11 / 0 Ng6 Ne2 Nxf4 Nxf4 Qg5 Bh5 Be5 h4 Qh6 Rg2 Kh8
[12] -0.50 7.68 6227151 (EBR = 0.72) 12 / 0 Ng6 Ne2 Nxf4 Nxf4 Qg5 Bh5 Be5 h4 Qh6 Rg2 Kh8 Qf3
[13] -0.59 14.38 11899703 (EBR = 2.31) 14 / 0 Ng6 Ne2 Nxf4 Nxf4 Qg5 Bh5 Be5 h4 Qh6 Qd1 Bd4 Kh1 Qg7 Qb3
[14] -0.59 23.98 20040165 (EBR = 1.43) 14 / 5 Ng6 Ne2 Nxf4 Nxf4 Qg5 Kh2 Be5 Bh1 Re8 Re2 Kh8 Re1 Bd7 Qxb7 Bxf4 gxf4 Rxe2 Rxe2 Qxf4
[15] -0.59 39.63 33623841 (EBR = 1.63) 15 / 0 Ng6 Ne2 Nxf4 Nxf4 Qg5 Kh2 Be5 Bh1 Re8 Re2 Kh8 Qb5 Rg8 Re3 Qh6
[16] -0.55 134.07 109520874 (EBR = 6.03) 17 / 0 Ng6 Ne2 Bd7 Kh2 Rb8 a4 Kh8 Bh5 Be5 Bxe5 dxe5 Qe3 Rg8 d6 Qe6 Qxc5 Bxa4
--> Ng6 -0.55