For some reason Ancalagon thinks even after six minutes, plydepth 17, that having the exchange is worth at least four and a half pawns for White. It is even Black that gains an advanced passed pawn -Edit: True, he has to sell his car, sorry horse to do this and keep some credit with the bank, that kind of slipped past me - and it is White that has no King position that is worth its name, for the White King its an Housing Crisis endgame already but Black still has a luxurious castle to live in.
But at least the program finds Timman's required Nc4+ at ply thirteen and Black's score is even going up to being about two mortgaged pawns in the red
Edit: reached 19 plies deep: Now Black is just down 1⅓ pawn!
[d]q1bQ1nk1/5rbp/6p1/np2p3/4P3/1P2BPN1/1K4P1/1NR4R b - -
Engine: Ancalagon 1.08 Testversion 002 (Athlon 2009 MHz, 256 MB)
by Tord Romstad
2.00 0:00 -6.39 1...Nc6 2.Rxc6 Qxc6 (415) 1
3.00 0:00 -6.39 1...Nc6 2.Rxc6 Qxc6 (586) 1
4.00 0:00 -7.21 1...Nc6 2.Rxc6 Qxc6 3.Nc3 (1.222) 3
5.00 0:00 -5.80 1...Nc6 2.Rxc6 Qxc6 3.Rc1 Rd7 4.Qxc8 Qxc8
5.Rxc8 (3.187) 9
6.00 0:00 -4.88 1...Nc6 2.Rxc6 Qxc6 3.Rc1 Qd7 4.Rxc8 Kh8
5.Qxd7 Rxd7 (12.674) 35
7.00 0:00 -4.90 1...Nc6 2.Rxc6 Qxc6 3.Rc1 Qd7 4.Rxc8 Kh8
5.Nc3 (23.448) 59
8.00 0:00 -5.03 1...Nc6 2.Rxc6 Qxc6 3.Rc1 Qd7 4.Rxc8 Kh8
5.Nc3 b4 (46.368) 98
9.00 0:00 -5.01 1...Nc6 2.Rxc6 Qxc6 3.Rc1 Qe6 4.Qxc8 Kh8
5.Nd2 h6 6.Rc7 (101.342) 158
10.00 0:00 -5.00 1...Nc6 2.Rxc6 Qxc6 3.Rc1 Qe6 4.Qxc8 Kh8
5.Nd2 h6 6.Rc7 Rd7 (157.662) 197
11.00 0:01 -5.54 1...Nc6 2.Rxc6 Qxc6 3.Rc1 Qe6 4.Qxc8 Kh8
5.Qxe6 Nxe6 6.Nc3 Rb7 7.Nd5 Rd7
8.Rc8+ Bf8 (273.499) 243
11.02 0:01 -5.29 1...Bb7 2.Qxa8 Bxa8 3.Nc3 b4 4.Nb5 Bc6
5.Na7 Be8 6.Ra1 Nc6 7.Nb5 (436.202) 271
12.01 0:02 -5.72 1...Bb7 2.Qxa8 Bxa8 3.Na3 h5 4.Nxh5 gxh5
5.Rxh5 b4 6.Nc4 Nxc4+ 7.bxc4 Rd7
8.Ra1 Rd3 9.Rxa8 Rxe3 (880.060) 301
12.02 0:03 -5.37 1...Nc6 2.Rxc6 Qxc6 3.Rc1 Bf6 4.Rxc6 Bxd8
5.Rxc8 Ne6 6.Rb8 b4 7.Rxb4 h5 8.Nc3 (1.126.890) 310
13.01 0:05 -5.41 1...Nc6 2.Rxc6 Qxc6 3.Rc1 Bf6 4.Rxc6 Bxd8
5.Rxc8 Ne6 6.Rb8 b4 7.Rxb4 Rc7 8.Nc3 Kf7 (1.749.302) 315
13.06 0:27 -5.19 1...Nc4+ 2.bxc4 Rd7 3.Qh4 bxc4 4.Nc3 Qb7+
5.Ka1 Qb3 6.Nf1 Qa3+ 7.Na2 h5 8.Rxc4 Ba6
9.Rc3 Rd1+ 10.Bc1 (8.434.215) 303
14.01 0:40 -4.98 1...Nc4+ 2.bxc4 Rd7 3.Qh4 bxc4 4.Nc3 Qb7+
5.Ka1 Qb3 6.Nf1 Rd3 7.Nd2 Qa3+ 8.Na2 Be6
9.Nxc4 Bxc4 10.Rxc4 Rxe3 (12.138.734) 300
15.01 1:15 -4.74 1...Nc4+ 2.bxc4 Rd7 3.Qh4 bxc4 4.Nc3 Qb7+
5.Ka1 Qb3 6.Nf1 Rd3 7.Qe1 h5 8.Bc5 Ne6
9.Nd2 Qb7 10.Be3 (22.818.715) 300
16.01 2:48 -4.49 1...Nc4+ 2.bxc4 Rd7 3.Qh4 bxc4 4.Nc3 Qb7+
5.Ka1 Qb3 6.Nf1 Rd3 7.Qe1 h5 8.Na2 Qa4
9.Qb4 Qxb4 10.Nxb4 Ra3+ 11.Na2 Be6 (50.934.786) 302
17.01 6:24 -4.52 1...Nc4+ 2.bxc4 Rd7 3.Qh4 bxc4 4.Nc3 Qb7+
5.Ka1 Qb3 6.Nf1 Rd3 7.Qe1 h5 8.Na2 Qa4
9.Qb4 Qxb4 10.Nxb4 Ra3+ 11.Na2 Be6
12.Kb2 Rb3+ 13.Kc2 (114.779.494) 298
18.01 12:53 -2.19 1...Nc4+ 2.bxc4 Rd7 3.Qh4 bxc4 4.Nc3 Qb7+
5.Ka1 Rd3 6.Nf1 Qa6+ 7.Na2 c3 8.Rc2 Be6
9.Bc1 Bb3 10.Qf2 h6 11.Ne3 Bxc2
12.Qxc2 Rxe3 13.Bxe3 (236.801.672) 306
19.01 24:16 -1.29 1...Nc4+ 2.bxc4 Rd7 3.Qh4 bxc4 4.Nc3 Qb7+
5.Ka1 Rd3 6.Nf1 Qa6+ 7.Na2 c3 8.Rc2 Be6
9.Bc1 Bb3 10.Qf2 h6 11.Ne3 Ne6
12.Nd5 Bxc2 13.Qxc2 (448.314.108) 307