Hard one except for Houdini
Analysis by Houdini 6 x64-pext Tac:
1...Nf4
-/+ (-0.89 ++) Depth: 19/45 00:00:04 32404kN, tb=2
1...Nf4
-/+ (-1.25 ++) Depth: 19/45 00:00:04 34274kN, tb=2
1...Nf4
-+ (-1.72 ++) Depth: 19/52 00:00:05 41393kN, tb=8
1...Nf4 2.Bxb7 Nh3+ 3.Kg2 Qxb7+ 4.Kxh3 Qf3 5.d5 exd5 6.Ne3 Bc5 7.b4 Bxe3 8.fxe3 Qg4+ 9.Kg2 Qe2+ 10.Kg1 Qxb2 11.a3 h4 12.gxh4 Qe2 13.Re1 Qg4+ 14.Kh1 Qxh4 15.Rac1 Qe4+
-+ (-1.74) Depth: 19/52 00:00:05 42716kN, tb=9
1...Nf4 2.Bxb7 Nh3+ 3.Kg2 Qxb7+ 4.Kxh3 Qf3 5.d5 exd5 6.Ne3 Bc5 7.b4 Bxe3 8.fxe3 Qg4+ 9.Kg2 Qe2+ 10.Kg1 Qxb2 11.a3 h4 12.gxh4 Qe2 13.Re1 Qg4+ 14.Kh1 Qxh4 15.Rac1 Qe4+
-+ (-1.74) Depth: 19/52 00:00:05 42725kN, tb=9
1...Nf4
-+ (-1.81 ++) Depth: 20/52 00:00:05 44647kN, tb=9
1...Nf4
-+ (-1.88 ++) Depth: 20/52 00:00:06 46691kN, tb=9
1...Nf4
-+ (-1.98 ++) Depth: 20/52 00:00:06 50723kN, tb=12
1...Nf4
-+ (-2.13 ++) Depth: 20/52 00:00:06 53699kN, tb=12
1...Nf4 2.Bxb7
-+ (-2.01 --) Depth: 20/52 00:00:07 56205kN, tb=12
1...Nf4 2.Bxb7
-+ (-1.74 --) Depth: 20/52 00:00:07 58359kN, tb=12
1...Nf4
-+ (-1.95 ++) Depth: 20/52 00:00:07 60342kN, tb=12
1...Nf4
-+ (-2.42 ++) Depth: 20/52 00:00:08 64440kN, tb=13
1...Nf4 2.Bxb7 Nh3+ 3.Kg2 Qxb7+ 4.Kxh3 Qf3 5.Ne3 Qxf2 6.Rc8 g5 7.Bc3 g4+ 8.Nxg4 hxg4+ 9.Kxg4 Qf5+ 10.Kh4 Qh7+ 11.Kg4 f5+ 12.Kf4 Qb7 13.Rxf8+ Kxf8 14.Ke3 Qg2 15.Kd3 Kf7 16.Bd2 Qf3+
-+ (-2.23) Depth: 20/52 00:00:08 68052kN, tb=15
1...Nf4 2.Bxb7 Nh3+ 3.Kg2 Qxb7+ 4.Kxh3 Qf3 5.Ne3 Qxf2 6.Rc8 g5 7.Bc3 g4+ 8.Nxg4 hxg4+ 9.Kxg4 Qf5+ 10.Kh4 Qh7+ 11.Kg4 f5+ 12.Kf4 Qb7 13.Rxf8+ Kxf8 14.Ke3 Qg2 15.Kd3 Kf7 16.Bd2 Qf3+
-+ (-2.23) Depth: 20/52 00:00:08 68063kN, tb=15
1...Nf4
-+ (-2.30 ++) Depth: 21/52 00:00:09 71399kN, tb=15
1...Nf4
-+ (-2.37 ++) Depth: 21/52 00:00:09 72917kN, tb=15
1...Nf4
-+ (-2.48 ++) Depth: 21/52 00:00:09 75343kN, tb=15
1...Nf4
-+ (-2.63 ++) Depth: 21/52 00:00:10 79006kN, tb=21
1...Nf4 2.Bxb7
-+ (-2.51 --) Depth: 21/52 00:00:10 79893kN, tb=22
1...Nf4
-+ (-2.67 ++) Depth: 21/52 00:00:10 86575kN, tb=40
1...Nf4 2.Bxb7
-+ (-2.45 --) Depth: 21/52 00:00:11 87972kN, tb=40
1...Nf4
-+ (-2.74 ++) Depth: 21/61 00:00:11 91997kN, tb=41
1...Nf4 2.Bxb7
-+ (-2.36 --) Depth: 21/61 00:00:12 96952kN, tb=41
1...Nf4 2.Bxb7 Nh3+ 3.Kg2 Qxb7+ 4.Kxh3 Qf3 5.Rh1 g5 6.Rae1 Be7 7.Bc1 Kg7 8.Rhg1 Qxf2 9.Ne3 Kg6 10.Ref1 g4+ 11.Nxg4 hxg4+ 12.Kxg4 Qxh2 13.Kf3 Qxa2 14.Rh1 Bd6 15.Be3 Qxb3 16.Rc1 Qd5+ 17.Kf2 Qf5+
-+ (-2.25) Depth: 21/61 00:00:12 98790kN, tb=42
1...Nf4 2.Bxb7 Nh3+ 3.Kg2 Qxb7+ 4.Kxh3 Qf3 5.Rh1 g5 6.Rae1 Be7 7.Bc1 Kg7 8.Rhg1 Qxf2 9.Ne3 Kg6 10.Ref1 g4+ 11.Nxg4 hxg4+ 12.Kxg4 Qxh2 13.Kf3 Qxa2 14.Rh1 Bd6 15.Be3 Qxb3 16.Rc1 Qd5+ 17.Kf2 Qf5+
-+ (-2.25) Depth: 21/61 00:00:12 98863kN, tb=42
1...Nf4
-+ (-2.32 ++) Depth: 22/61 00:00:13 109mN, tb=105
1...Nf4
-+ (-2.39 ++) Depth: 22/61 00:00:13 111mN, tb=105
1...Nf4
-+ (-2.49 ++) Depth: 22/61 00:00:14 114mN, tb=105
1...Nf4
-+ (-2.64 ++) Depth: 22/61 00:00:14 118mN, tb=105
1...Nf4
-+ (-2.85 ++) Depth: 22/61 00:00:15 125mN, tb=105
1...Nf4 2.Bxb7 Nh3+ 3.Kg2 Qxb7+ 4.Kxh3 Qf3 5.Rg1 b5 6.Nd2 Qxf2 7.Raf1 Qxd2 8.Rg2 Qg5 9.Rgf2 Qd5 10.Bc1 Be7 11.Rc2 Qxd4 12.Rf4 Qd7 13.Rff2 e5+ 14.Kg2 Qd5+ 15.Kh3 Qe4
-+ (-2.88) Depth: 22/61 00:00:16 136mN, tb=111
1...Nf4 2.Bxb7 Nh3+ 3.Kg2 Qxb7+ 4.Kxh3 Qf3 5.Rg1 b5 6.Nd2 Qxf2 7.Raf1 Qxd2 8.Rg2 Qg5 9.Rgf2 Qd5 10.Bc1 Be7 11.Rc2 Qxd4 12.Rf4 Qd7 13.Rff2 e5+ 14.Kg2 Qd5+ 15.Kh3 Qe4
-+ (-2.88) Depth: 22/61 00:00:17 141mN, tb=113