This must be Ivanchuk worse blunder ever

[pichy]

In this position instead of playing Bf6, Ivanchuk blundered and played Nxc4?

[D]2rr2k1/2qpb1pp/1p1np3/8/1PP2P2/2QR2P1/3N2BP/2R3K1 b - - 0 1

[Ajedrecista]

Hello:

In this position instead of playing Bf6, Ivanchuk blundered and played Nxc4?

[D]2rr2k1/2qpb1pp/1p1np3/8/1PP2P2/2QR2P1/3N2BP/2R3K1 b - - 0 1

Before ..., b5; Ne3, Qxc3; Rdxc3, Rxc3; Rxc3, Bxb4 (the main line given by SF 2.2 with default settings), I let SF to run 75 minutes in an Intel Pentium D930 (3 GHz) using 1 GB of hash and a SearchLog file for SF 2.2 w32 (2 cores):

[d]3r2k1/3p2pp/4p3/1p6/1b3P2/2R1N1P1/6BP/6K1 w - - 0 1

Searching: 3r2k1/3p2pp/4p3/1p6/1b3P2/2R1N1P1/6BP/6K1 w - - 0 1
infinite: 1 ponder: 0 time: 0 increment: 0 moves to go: 0
1 +2.10 00:00 72 Rc7
2 +1.37 00:00 339 Rc7 Kf7
3 +1.62 00:00 630 Rc7 Kf7 Be4
4 +1.37 00:00 1181 Rc7 Kf7 Be4 Bd6
5 +1.66 00:00 2341 Rc7 Kf7 Be4 Bd6 Ra7
6 +1.45 00:00 3909 Rc7 Bd6 Rc1 Kf7 Be4 Ba3
7 +1.74 00:00 6991 Rc7 Bd6 Rc1 Kf7 Be4 g6 Kf2
8 +1.41 00:00 13318 Rc7 Bd6 Rc1 Kf7 Be4 g6 Kf2 b4 Nc4 Bc5+ Ke2 Kf6
9 +1.41 00:00 14880 Rc7 Bd6 Rc1 Kf7 Be4 g6 Kf2 b4 Nc4 Bc5+ Ke2 Kf6
10 +1.41 00:00 57893 Rc2 Bd6 Kf2 b4 Be4 Kf7 Rc1 g6 Nc4 Bc5+ Ke2 Kf6
11 +1.29 00:01 221084 Rc2 Be7 Kf2 d5 Bh3 Kf7 Ng4 Bd6 Ne5+ Kf6 Rb2 Rc8 Ke3
b4 Bg4 Bc5+ Kd3
12 +1.49 00:01 545225 Rc2 Be7 Kf2 Kf7 Rc7 d5 Rb7 Ra8 Nxd5 Ra2+ Ke3 Ra3+
Kd4 exd5 Bxd5+ Kf6 Rb6+ Kf5 Be6+ Kg6 f5+ Kg5 Rxb5
13 +1.70 00:01 986512 Rc2 Bd6 Kf2 b4 Ke2 g6 Kd3 Kg7 Nc4 Bc5 Ne5 Bg1 Nf3
Bb6 Rb2 Bc5 Ne5 d5
14 +1.58 00:02 1085K Rc2 Bd6 Kf2 Kf7 Ke2 Ke7 Be4 g6 Kd3 b4 Nc4 Rc8 Nxd6
Rxc2 Kxc2 Kxd6
15 +1.37 00:02 1713K Rc2 Ba5 Kf2 Rb8 Ke2 b4 Kd3 b3 Rb2 Bd8 Nc4 Bf6 Rb1 d5
Ne5 Bxe5 fxe5 Kf7 Bf3
16 +1.41 00:03 2416K Rc2 Ba5 Kf2 Rb8 Ra2 Bb6 Rd2 Rc8 Ke2 Rc3 Nd1 Rc7 Rb2
Bg1 Ne3 Bxh2 Nf1 Bg1 Rxb5
17 +1.58 00:05 3999K Rc2 Bd6 Kf2 Kf7 Ke2 Ke7 Kd3 g6 h3 Rf8 Be4 b4 Nc4 Rc8
Nxd6 Rxc2 Kxc2 Kxd6
18 +1.41 00:06 5034K Rc2 Bd6 Kf2 Kf7 Ke2 Ke7 Kd3 g6 h3 Rf8 Be4 Bb4 Rc1
Ba3 Rb1 d5 Bxd5 exd5 Nxd5+ Ke6 Nc7+ Kf6 Nxb5 Rd8+
Ke4
19 +1.54 00:08 6695K Rc2 Bd6 Kf2 Kf7 Ke2 Ke7 Kd3 g6 Nf1 b4 Nd2 Rb8 Nb3
Rf8 Na5 Rh8 Nc4 Rc8 Nb6 Rxc2 Kxc2
20 +1.45 00:10 8408K Rc2 Bd6 Kf2 Kf7 Ke2 Ke7 Kd3 g6 Nf1 b4 Nd2 Rb8 Nb3 h6
Be4 g5 f5 Be5 fxe6 dxe6 Ra2 Rc8 Ra7+ Kf6
21 +1.58 00:15 13495K Rc2 Bd6 Kf2 Kf7 Ke2 Ke7 Kd3 g6 Nf1 Rg8 Nd2 g5 fxg5
Rxg5 Be4 h6 Ra2 b4 Nb3 Be5 Ra7 Rh5 Nc5 Rxh2 Rxd7+
Kf6
22 +1.49 00:20 18033K Rc2 Bd6 Kf2 Kf7 Ke2 g6 Kd3 Rb8 Nf1 b4 Nd2 Ke7 Nb3
Rg8 Be4 Bb8 Nd4 Re8 Rc1 Rf8 Nb3 d5 Bf3 g5 Nd4 gxf4
Nc6+ Kd6 gxf4
23 +1.49 00:27 24046K Rc2 Bd6 Kf2 Kf7 Ke2 g6 Kd3 Rb8 Nf1 b4 Nd2 Ke7 Nb3
Rg8 Be4 Bb8 Nd4 Re8 Rc1 Rf8 Nb3 d5 Bf3 g5 Nd4 gxf4
Nc6+ Kd6 gxf4
24 +1.54 00:43 37863K Rc2 Bd6 Kf2 Kf7 Ke2 g6 Kd3 Rb8 Nf1 b4 Nd2 Ke7 Nb3
Rg8 Be4 Rf8 Rc4 Kf6 Kd4 h6 Rc1 g5 Nc5 Ke7 fxg5 hxg5
25 +1.49 01:33 70241K Rc2 Bd6 Kf2 Kf7 f5 Kf6 Rd2 Be7 Ke2 b4 fxe6 dxe6 Rxd8
Bxd8 Nc4 Be7 Kd3 Bc5 Nd2 Bg1 Kc4 Bxh2 Kxb4 Ke7 Ne4
e5 Kc5 Bg1+ Kd5
26 +1.58 02:38 98434K Rc2 Bd6 Kf2 Kf7 f5 Kf6 Rd2 Be7 Ke2 g6 fxg6 Kxg6 Ng4
d6 Rb2 Rb8 Be4+ Kg5 Nf2 b4 h4+ Kf6 Bxh7 b3 Ng4+ Kg7
Bd3 d5 h5 Ba3 h6+ Kh8 Rb1 Bd6 Kf3 b2 Nf6
27 +1.54 09:58 244860K Rc2 Bd6 f5 Kf7 Kf1 h5 Rb2 Rb8 Bf3 g6 Rd2 Bc5 Rxd7+
Kf6 Ke2 gxf5 Rc7 Bd6 Rh7 h4 Rxh4 Rc8 Rh7 Ke5 Rb7 b4
Kd2 Rc3 Be2 Bc5
28 +1.70 21:31 470635K Rb3 Bc5 Kf1 Rb8 Ng4 Kf7 Ne5+ Ke8 Ke2 b4 Nd3 Bd6 Ke3
Be7 Kd2 Rb5 Bf3 g5 fxg5 Bxg5+ Kc2 Be7 Rb1 Ra5 Be4
Rh5 h4 Bd6 Rg1
29 +1.66 30:38 649444K Rb3 Bc5 Kf1 Rb8 Ng4 Kf7 Ne5+ Ke8 Ke2 b4 Nd3 Be7 Bf3
Rc8 Kd2 Rc4 Ne5 Rc7 Be4 g6 Rb1 Bc5 Nd3 Be7 Bf3 Rc4
Bd1 Bf6 Ba4 Bc3+ Kc2 Rc8 Bb5 Bd4+ Kb3
30 +1.74 1:13:25 1472M Rb3 Bc5 Kf1 b4 Ng4 Kf8 Ne5 g6 Ke2 Ke8 Nd3 Be7 Kd2
Rb8 Bf3 Bd6 Bd1 Ke7 Ke3 h6 Bf3 g5 fxg5 hxg5 Rb2 Kf6
Kd4 Ke7 Bg4 Kf6 Nc5 Bxc5+ Kxc5 b3 Kc4
31 +0.00 1:15:00 1503M Rb3 Bc5 Kf1 b4 Ng4 Kf8 Ne5 g6 Ke2 Ke8 Nd3 Be7 Kd2
Rb8 Bf3 Bd6 Bd1 Ke7 Ke3 h6 Bf3 g5 fxg5 hxg5 Rb2 Kf6
Kd4 Ke7 Bg4 Kf6 Nc5 Bxc5+ Kxc5 b3 Kc4
Nodes: 1503381582
Nodes/second: 334073
Best move: Rb3
Ponder move: Bc5

I stopped the analysis and I do not understand the last 0 eval (maybe it is due to the sudden stop of the infinite analysis). If I copy the engine output under Arena 2.0.1 to the clipboard, the results differ a little:

FEN: 3r2k1/3p2pp/4p3/1p6/1b3P2/2R1N1P1/6BP/6K1 w - - 0 5

Stockfish-22-32-ja:
1/1 00:00 72 98 +2,10 Rc3c7
2/4 00:00 339 461 +1,37 Rc3c7 Kg8f7
3/4 00:00 630 840 +1,61 Rc3c7 Kg8f7 Bg2e4
4/4 00:00 1.181 1.574 +1,37 Rc3c7 Kg8f7 Bg2e4 Bb4d6
5/6 00:00 2.341 3.060 +1,65 Rc3c7 Kg8f7 Bg2e4 Bb4d6 Rc7a7
6/7 00:00 3.909 5.109 +1,45 Rc3c7 Bb4d6 Rc7c1 Kg8f7 Bg2e4 Bd6a3
7/9 00:00 6.991 8.951 +1,73 Rc3c7 Bb4d6 Rc7c1 Kg8f7 Bg2e4 g7g6 Kg1f2
8/14 00:00 13.318 16.401 +1,41 Rc3c7 Bb4d6 Rc7c1 Kg8f7 Bg2e4 g7g6 Kg1f2 b5b4 Ne3c4 Bd6c5+ Kf2e2 Kf7f6
9/14 00:00 14.880 18.325 +1,41 Rc3c7 Bb4d6 Rc7c1 Kg8f7 Bg2e4 g7g6 Kg1f2 b5b4 Ne3c4 Bd6c5+ Kf2e2 Kf7f6
10/23 00:00 57.893 66.163 +1,41 Rc3c2 Bb4d6 Kg1f2 b5b4 Bg2e4 Kg8f7 Rc2c1 g7g6 Ne3c4 Bd6c5+ Kf2e2 Kf7f6
11/24 00:01 221.084 205.087 +1,29 Rc3c2 Bb4e7 Kg1f2 d7d5 Bg2h3 Kg8f7 Ne3g4 Be7d6 Ng4e5+ Kf7f6 Rc2b2 Rd8c8 Kf2e3 b5b4 Bh3g4 Bd6c5+ Ke3d3
12/26 00:01 545.225 379.418 +1,49 Rc3c2 Bb4e7 Kg1f2 Kg8f7 Rc2c7 d7d5 Rc7b7 Rd8a8 Ne3xd5 Ra8a2+ Kf2e3 Ra2a3+ Ke3d4 e6xd5 Bg2xd5+ Kf7f6 Rb7b6+ Kf6f5 Bd5e6+ Kf5g6 f4f5+ Kg6g5 Rb6xb5
13/28 00:01 986.512 513.273 +1,69 Rc3c2 Bb4d6 Kg1f2 b5b4 Kf2e2 g7g6 Ke2d3 Kg8g7 Ne3c4 Bd6c5 Nc4e5 Bc5g1 Ne5f3 Bg1b6 Rc2b2 Bb6c5 Nf3e5 d7d5
14/28 00:02 1.085.365 534.399 +1,57 Rc3c2 Bb4d6 Kg1f2 Kg8f7 Kf2e2 Kf7e7 Bg2e4 g7g6 Ke2d3 b5b4 Ne3c4 Rd8c8 Nc4xd6 Rc8xc2 Kd3xc2 Ke7xd6
15/28+ 00:02 1.298.509 569.271 +1,65 Rc3c2 Bb4d6 Kg1f2 Kg8f7 Kf2e2 Kf7e7 Bg2e4 g7g6 Ke2d3 b5b4 Ne3c4 Rd8c8 Nc4xd6 Rc8xc2 Kd3xc2 Ke7xd6 Kc2b3
15/28- 00:02 1.367.982 579.899 +1,49 Rc3c2 Bb4d6 Kg1f2 Kg8f7 Kf2e2 Kf7e7 Bg2e4 Rd8b8 Be4xh7 b5b4 Ne3c4 b4b3 Rc2b2 Rb8h8 Nc4xd6 Rh8xh7
15/28- 00:02 1.690.148 621.835 +1,37 Rc3c2 Bb4a5 Kg1f2 Rd8b8 Kf2e2 b5b4 Ke2d3 b4b3 Rc2b2 Ba5d8 Ne3c4 Bd8f6
15/28 00:02 1.713.205 622.983 +1,37 Rc3c2 Bb4a5 Kg1f2 Rd8b8 Kf2e2 b5b4 Ke2d3 b4b3 Rc2b2 Ba5d8 Ne3c4 Bd8f6 Rb2b1 d7d5 Nc4e5 Bf6xe5 f4xe5 Kg8f7 Bg2f3
16/30+ 00:03 2.015.747 654.888 +1,45 Rc3c2 Bb4a5 Kg1f2 Rd8b8 Kf2e2 b5b4 Ke2d3 b4b3 Rc2b2 Ba5d8 Rb2b1 Bd8e7 f4f5 Be7c5 f5xe6 d7xe6 Ne3c4
16/30+ 00:03 2.118.025 664.582 +1,53 Rc3c2 Bb4a5 Kg1f2 Rd8b8 Kf2e2 b5b4 Ke2d3 b4b3 Rc2b2 Ba5d8 Rb2b1 Bd8e7 Ne3c4 Be7c5 Nc4e5 d7d6 Ne5c6
16/30 00:03 2.416.993 687.622 +1,41 Rc3c2 Bb4a5 Kg1f2 Rd8b8 Rc2a2 Ba5b6 Ra2d2 Rb8c8 Kf2e2 Rc8c3 Ne3d1 Rc3c7 Rd2b2 Bb6g1 Nd1e3 Bg1xh2 Ne3f1 Bh2g1 Rb2xb5
17/31+ 00:03 2.820.181 713.428 +1,49 Rc3c2 Bb4a5 Kg1f2 Rd8b8 Rc2a2 Ba5b6 Kf2e2 Bb6c5 Ra2b2 b5b4 Ne3c4 Rb8b5 Ke2d3 d7d5 Nc4e5 Rb5a5 Bg2h3 Ra5a6 Kd3e2 d5d4 Ke2d3
17/31+ 00:04 3.189.357 734.367 +1,57 Rc3c2 Bb4a5 Kg1f2 Rd8b8 Rc2a2 Ba5b6 Kf2e2 Bb6c5 Ra2b2 b5b4 Ne3c4 Rb8b5 Ke2d3 d7d5 Nc4e5 Rb5a5 Bg2h3 Ra5a6 Kd3e2 d5d4 Ke2d3
17/31 00:05 3.999.473 766.476 +1,57 Rc3c2 Bb4d6 Kg1f2 Kg8f7 Kf2e2 Kf7e7 Ke2d3 g7g6 h2h3 Rd8f8 Bg2e4 b5b4 Ne3c4 Rf8c8 Nc4xd6 Rc8xc2 Kd3xc2 Ke7xd6
18/31- 00:05 4.239.233 770.769 +1,49 Rc3c2 Bb4d6 Kg1f2 Kg8f7 Kf2e2 Kf7e7 Ke2d3 g7g6 h2h3 Rd8f8 Bg2e4 Bd6b4 Rc2b2 Bb4e1
18/31- 00:05 4.398.033 775.393 +1,41 Rc3c2 Bb4d6 Bg2e4 b5b4 Kg1f2 g7g6 Ne3c4 b4b3 Nc4xd6 b3xc2 Be4xc2 Rd8b8
18/31 00:06 5.034.927 791.779 +1,41 Rc3c2 Bb4d6 Kg1f2 Kg8f7 Kf2e2 Kf7e7 Ke2d3 g7g6 h2h3 Rd8f8 Bg2e4 Bd6b4 Rc2c1 Bb4a3 Rc1b1 d7d5 Be4xd5 e6xd5 Ne3xd5+ Ke7e6 Nd5c7+ Ke6f6 Nc7xb5 Rf8d8+ Kd3e4
19/33+ 00:07 5.698.626 806.942 +1,49 Rc3c2 Bb4d6 Kg1f2 Kg8f7 Kf2e2 Kf7e7 Ke2d3 g7g6 Ne3f1 b5b4 Nf1d2 e6e5 f4xe5 Bd6xe5 Rc2c4
19/33+ 00:07 6.354.206 818.313 +1,57 Rc3c2 Bb4d6 Kg1f2 Kg8f7 Kf2e2 Kf7e7 Ke2d3 g7g6 Ne3f1 b5b4 Nf1d2 e6e5 f4xe5 Bd6xe5 Rc2c4
19/33 00:08 6.695.963 819.378 +1,53 Rc3c2 Bb4d6 Kg1f2 Kg8f7 Kf2e2 Kf7e7 Ke2d3 g7g6 Ne3f1 b5b4 Nf1d2 Rd8b8 Nd2b3 Rb8f8 Nb3a5 Rf8h8 Na5c4 Rh8c8 Nc4b6 Rc8xc2 Kd3xc2
20/33- 00:08 7.385.349 829.255 +1,45 Rc3c2 Bb4d6 Kg1f2 Kg8f7 Kf2e2 Kf7e7 Ke2d3 g7g6 Ne3f1 b5b4 Nf1d2 Rd8b8 Nd2b3 h7h6 Bg2e4 g6g5 f4f5 Bd6e5 f5xe6 d7xe6
20/33 00:10 8.408.199 839.560 +1,45 Rc3c2 Bb4d6 Kg1f2 Kg8f7 Kf2e2 Kf7e7 Ke2d3 g7g6 Ne3f1 b5b4 Nf1d2 Rd8b8 Nd2b3 h7h6 Bg2e4 g6g5 f4f5 Bd6e5 f5xe6 d7xe6 Rc2a2 Rb8c8 Ra2a7+ Ke7f6
21/33+ 00:11 10.077.231 853.135 +1,53 Rc3c2 Bb4d6 Kg1f2 Kg8f7 Kf2e2 Kf7e7 Ke2d3 g7g6 Ne3f1 b5b4 Nf1d2 Rd8b8 Nd2b3 h7h6 Bg2e4 g6g5 f4f5 Bd6e5 f5xe6 d7xe6 Nb3a5 b4b3 Na5c6+ Ke7f6 Rc2f2+
21/36 00:15 13.495.515 870.678 +1,57 Rc3c2 Bb4d6 Kg1f2 Kg8f7 Kf2e2 Kf7e7 Ke2d3 g7g6 Ne3f1 Rd8g8 Nf1d2 g6g5 f4xg5 Rg8xg5 Bg2e4 h7h6 Rc2a2 b5b4 Nd2b3 Bd6e5 Ra2a7 Rg5h5 Nb3c5 Rh5xh2 Ra7xd7+ Ke7f6
22/36- 00:17 15.735.103 878.761 +1,49 Rc3c2 Bb4d6 Kg1f2 Kg8f7 Kf2e2 g7g6 Ke2d3 Rd8b8 Ne3f1 b5b4 Nf1d2 Kf7e7 Nd2b3 Rb8g8 Kd3d4 g6g5 f4xg5 Rg8xg5 Bg2e4 Bd6e5+ Kd4d3 Be5xg3 h2xg3 Rg5xg3+ Kd3c4 d7d5+
22/36 00:20 18.033.789 885.789 +1,49 Rc3c2 Bb4d6 Kg1f2 Kg8f7 Kf2e2 g7g6 Ke2d3 Rd8b8 Ne3f1 b5b4 Nf1d2 Kf7e7 Nd2b3 Rb8g8 Bg2e4 Bd6b8 Nb3d4 Rg8e8 Rc2c1 Re8f8 Nd4b3 d7d5 Be4f3 g6g5 Nb3d4 g5xf4 Nd4c6+ Ke7d6 g3xf4
23/36 00:27 24.046.538 890.118 +1,49 Rc3c2 Bb4d6 Kg1f2 Kg8f7 Kf2e2 g7g6 Ke2d3 Rd8b8 Ne3f1 b5b4 Nf1d2 Kf7e7 Nd2b3 Rb8g8 Bg2e4 Bd6b8 Nb3d4 Rg8e8 Rc2c1 Re8f8 Nd4b3 d7d5 Be4f3 g6g5 Nb3d4 g5xf4 Nd4c6+ Ke7d6 g3xf4
24/36+ 00:37 32.690.310 883.904 +1,57 Rc3c2 Bb4d6 Kg1f2 Kg8f7 Kf2e2 Kf7e7 f4f5 b5b4 f5xe6 d7xe6 Ne3c4 Rd8c8 Ke2d3 b4b3 Rc2b2
24/36 00:43 37.863.862 873.888 +1,53 Rc3c2 Bb4d6 Kg1f2 Kg8f7 Kf2e2 g7g6 Ke2d3 Rd8b8 Ne3f1 b5b4 Nf1d2 Kf7e7 Nd2b3 Rb8g8 Bg2e4 Rg8f8 Rc2c4 Ke7f6 Kd3d4 h7h6 Rc4c1 g6g5 Nb3c5 Kf6e7 f4xg5 h6xg5
25/39- 00:50 43.513.448 854.780 +1,45 Rc3c2 Bb4d6 Kg1f2 Kg8f7 Kf2e2 g7g6 Ke2d3 Rd8b8 Ne3f1 b5b4 Nf1d2 Bd6e7 Rc2c7 Kf7e8 Nd2b3 Be7d8 Rc7c4 Bd8f6
25/48 01:33 70.241.287 751.372 +1,49 Rc3c2 Bb4d6 Kg1f2 Kg8f7 f4f5 Kf7f6 Rc2d2 Bd6e7 Kf2e2 b5b4 f5xe6 d7xe6 Rd2xd8 Be7xd8 Ne3c4 Bd8e7 Ke2d3 Be7c5 Nc4d2 Bc5g1 Kd3c4 Bg1xh2 Kc4xb4 Kf6e7 Nd2e4 e6e5 Kb4c5 Bh2g1+ Kc5d5
26/48+ 02:20 91.420.288 651.257 +1,57 Rc3c2 Bb4d6 Kg1f2 Kg8f7 f4f5 Kf7f6 Rc2d2 Bd6e7 Kf2e2 b5b4 f5xe6 d7xe6 Rd2xd8 Be7xd8 Ne3c4 Bd8e7 Ke2d3 Be7c5 Nc4d2 Bc5g1 Nd2f3 Bg1c5 Kd3c4 Bc5f8 Nf3d2 e6e5 Bg2e4
26/48 02:38 98.434.157 621.525 +1,57 Rc3c2 Bb4d6 Kg1f2 Kg8f7 f4f5 Kf7f6 Rc2d2 Bd6e7 Kf2e2 g7g6 f5xg6 Kf6xg6 Ne3g4 d7d6 Rd2b2 Rd8b8 Bg2e4+ Kg6g5 Ng4f2 b5b4 h2h4+ Kg5f6 Be4xh7 b4b3 Nf2g4+ Kf6g7 Bh7d3 d6d5 h4h5 Be7a3 h5h6+ Kg7h8 Rb2b1 Ba3d6 Ke2f3 b3b2 Ng4f6
27/48- 05:05 148.729.143 487.088 +1,49 Rc3c2 Bb4d6 Kg1f2 Kg8f7 f4f5 h7h5 Kf2e2 h5h4 g3xh4 Rd8h8 Rc2d2 Kf7e7 f5xe6 d7xe6
27/48 09:58 244.860.843 409.070 +1,53 Rc3c2 Bb4d6 f4f5 Kg8f7 Kg1f1 h7h5 Rc2b2 Rd8b8 Bg2f3 g7g6 Rb2d2 Bd6c5 Rd2xd7+ Kf7f6 Kf1e2 g6xf5 Rd7c7 Bc5d6 Rc7h7 h5h4 Rh7xh4 Rb8c8 Rh4h7 Kf6e5 Rh7b7 b5b4 Ke2d2 Rc8c3 Bf3e2 Bd6c5
28/48+ 14:22 331.042.571 383.810 +1,61 Rc3b3 Bb4c5 Kg1f1 b5b4 Ne3g4 d7d6 Ng4f2 Kg8f7 Nf2d3 h7h6 Kf1e2 g7g5 f4xg5 h6xg5 Nd3xb4 Rd8h8 Nb4d3 Rh8xh2 Nd3xc5 Rh2xg2+
28/48+ 17:59 401.805.415 372.279 +1,69 Rc3b3 Bb4c5 Kg1f1 Rd8b8 Ne3g4 d7d6 Ng4f2 Kg8f7 Nf2d3 h7h6 h2h4 b5b4 Kf1e2 g7g5 h4xg5 h6xg5 f4xg5 Rb8g8 Nd3xb4 Rg8xg5 Nb4c6 d6d5 Bg2h3
28/48 21:31 470.635.560 364.449 +1,69 Rc3b3 Bb4c5 Kg1f1 Rd8b8 Ne3g4 Kg8f7 Ng4e5+ Kf7e8 Kf1e2 b5b4 Ne5d3 Bc5d6 Ke2e3 Bd6e7 Ke3d2 Rb8b5 Bg2f3 g7g5 f4xg5 Be7xg5+ Kd2c2 Bg5e7 Rb3b1 Rb5a5 Bf3e4 Ra5h5 h2h4 Be7d6 Rb1g1
29/48 30:38 649.444.963 353.313 +1,65 Rc3b3 Bb4c5 Kg1f1 Rd8b8 Ne3g4 Kg8f7 Ng4e5+ Kf7e8 Kf1e2 b5b4 Ne5d3 Bc5e7 Bg2f3 Rb8c8 Ke2d2 Rc8c4 Nd3e5 Rc4c7 Bf3e4 g7g6 Rb3b1 Be7c5 Ne5d3 Bc5e7 Be4f3 Rc7c4 Bf3d1 Be7f6 Bd1a4 Bf6c3+ Kd2c2 Rc4c8 Ba4b5 Bc3d4+ Kc2b3
30/49- 57:01 1.148.261.460 335.614 +1,57 Rc3b3 Bb4c5 Kg1f1 b5b4
30/49+ 1:01:18 1.233.188.318 335.205 +1,73 Rc3b3 Bb4c5 Kg1f1 b5b4 Ne3g4 h7h6 Rb3b2 d7d6 Ng4f2 g7g5 Nf2d3 g5xf4 g3xf4 Rd8f8 Kf1e2 Kg8g7 Bg2f3 Kg7g6 Bf3g4 Kg6f6 Nd3xb4 Bc5d4 Rb2c2
30/50 1:13:25 1.472.419.858 334.255 +1,73 Rc3b3 Bb4c5 Kg1f1 b5b4 Ne3g4 Kg8f8 Ng4e5 g7g6 Kf1e2 Kf8e8 Ne5d3 Bc5e7 Ke2d2 Rd8b8 Bg2f3 Be7d6 Bf3d1 Ke8e7 Kd2e3 h7h6 Bd1f3 g6g5 f4xg5 h6xg5 Rb3b2 Ke7f6 Ke3d4 Kf6e7 Bf3g4 Ke7f6 Nd3c5 Bd6xc5+ Kd4xc5 b4b3 Kc5c4

For example: +1.73 under Arena and +1.74 in the SearchLog file (at 1:13:25).

Two pawns for a knight: there will be surely better moves, but an eval of ~ +1.7 in SF is (AFAIK) really good for white, but not totally decisive (as could be with Houdini). If you want a BLUNDER, please check Kramnik's blunder of the century (when Kramnik disgracefully overlooked a mate in one against Fritz (computer) back in 2006).

IMHO (of a patzer like me), ...Nxc4 is not a good move but also it is not a total tragedy. Black must still playing.

Regards from Spain.

Ajedrecista.

[Karol Majewski]

This must be Ivanchuk worse blunder ever

Take a look at the game Nisipeanu - Ivanchuk. I don't remember the year. Think it was 1998 or 1999. That was the worst blunder of Ivanchuk

[mwyoung]

This must be Ivanchuk worse blunder ever

Take a look at the game Nisipeanu - Ivanchuk. I don't remember the year. Think it was 1998 or 1999. That was the worst blunder of Ivanchuk

[Event "Ch World FIDE (play-off), Las Vegas (USA)"]
[Site "Ch World FIDE (play-off), Las Vegas (USA)"]
[Date "1999.??.??"]
[EventDate "?"]
[Round "4"]
[Result "1-0"]
[White "Liviu Dieter Nisipeanu"]
[Black "Vassily Ivanchuk"]
[ECO "C45"]
[WhiteElo "?"]
[BlackElo "?"]
[PlyCount "27"]

1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Bc5 5. Nxc6 Qf6 6. Qd2
dxc6 7. Nc3 Qe7 8. Be2 Nf6 9. O-O Nxe4 10. Nxe4 Qxe4 11. Re1
O-O 12. Bd3 Qd5 13. b4 Bxf2+ 14. Qxf2 1-0

[zullil]

This must be Ivanchuk worse blunder ever

Take a look at the game Nisipeanu - Ivanchuk. I don't remember the year. Think it was 1998 or 1999. That was the worst blunder of Ivanchuk

[Event "Ch World FIDE (play-off), Las Vegas (USA)"]
[Site "Ch World FIDE (play-off), Las Vegas (USA)"]
[Date "1999.??.??"]
[EventDate "?"]
[Round "4"]
[Result "1-0"]
[White "Liviu Dieter Nisipeanu"]
[Black "Vassily Ivanchuk"]
[ECO "C45"]
[WhiteElo "?"]
[BlackElo "?"]
[PlyCount "27"]

1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Bc5 5. Nxc6 Qf6 6. Qd2
dxc6 7. Nc3 Qe7 8. Be2 Nf6 9. O-O Nxe4 10. Nxe4 Qxe4 11. Re1
O-O 12. Bd3 Qd5 13. b4 Bxf2+ 14. Qxf2 1-0

[D]r1b2rk1/ppp2ppp/2p5/2bq4/1P6/3B4/P1PQ1PPP/R1B1R1K1 b - b3 0 13

Does your favorite engine play Bxf2+ here?

[Darrel Briley]

Today's game was a shocker. Chucky is having a meltdown.

[Event ""]
[Site ""]
[Date "2012.01.04"]
[White "*GM_Ivanchuk"]
[Black "*GM_Caruana"]
[Result "0-1"]
[WhiteElo "2775"]
[BlackElo "2727"]
[TimeControl ""]

1. d4 Nf6 2. Nf3 g6 3. Bf4 Bg7 4. e3 d6 5. h3 O-O
6. Be2 b6 7. O-O Bb7 8. c3 Nbd7 9. Bh2 Qe8 10. a4 a6
11. Na3 e5 12. Nc4 Ne4 13. Nfd2 Nxd2 14. Nxd2 Kh8 15. Qc2 f5
16. Rfe1 g5 17. Bd3 Qg6 18. f3 Rae8 19. Rf1 d5 20. a5 c5
21. g4 e4 22. fxe4 dxe4 23. Be2 f4 24. axb6 Qxb6 25. Qb3 Qa7
26. Bb5 cxd4 27. Bxd7 dxe3 28. Nc4 Rd8 29. Ba4 Rd2 30. Qxb7 Qxb7
31. Rxf4 gxf4 32. Nxd2 exd2 33. Bxf4 Rxf4 34. Bc6 Qb6+

He makes a losing mistake and then throws away pieces at the end (out of anger, frustration?)

DB

[Dr.Wael Deeb]

Ivanchuk plays a series of brilliant moves just to throw a serious blunder and throw the game to the wind....

Donno,maybe he cracks under the pressure
Dr.D

[diep]

In this position instead of playing Bf6, Ivanchuk blundered and played Nxc4?

[D]2rr2k1/2qpb1pp/1p1np3/8/1PP2P2/2QR2P1/3N2BP/2R3K1 b - - 0 1

For a moment i thought i could also capture on c4.

Vincent