1. In its comments to a game vs Andscacs 0.92, specifically, in the PVs for its moves 45 and 46, Fizbo wrote illegal moves (45. d7 c2 46. d8Q cxd1Q+ h5+ Qf4+), and as far as I remember, it was writing those moves in PVs during the game too (in the Arena GUI). I hope it's only a display bug and Fizbo did check those pseudolegal moves for legality during its search.
2. In the analysis of the final position of the following line,
[pgn][Event "Computer chess game"]
[Site "?"]
[Date "2017.09.20"]
[Round "?"]
[White "tony"]
[Black "tony"]
[Result "*"]
[BlackElo "2400"]
[ECO "A80"]
[Opening "Dutch"]
[Time "01:30:47"]
[WhiteElo "3222"]
[TimeControl "30/120:40/120:60"]
[Termination "unterminated"]
[PlyCount "30"]
[WhiteType "program"]
[BlackType "human"]
1. d4 f5 2. d5 Nf6 3. Nf3 c6 4. c4 e6 5. dxe6 Bb4+ 6. Bd2 Bxd2+ 7. Qxd2 Ne4
8. Qd4 O-O 9. Nc3 c5 10. Qd3 Nxc3 11. exd7 Ne4 12. dxc8=Q Qxc8 13. g3 Rd8
14. Qc2 Nc6 15. Bg2 Qe6 *[/pgn]
Fizbo gives the 'normal' move 16. O-O in the 'final' PVs of each search iteration but the nonsensical 16. Qxe4 with an advantage for White in 'intermediate' PVs, not just the first few ones, but in every other variation throughout the search
Code: Select all
FEN: r2r2k1/pp4pp/2n1q3/2p2p2/2P1n3/5NP1/PPQ1PPBP/R3K2R w KQ - 5 16
Fizbo19x64:
4/10- 00:00 1k 120k -2,87 16.Qxe4 fxe4 17.0-0 exf3
4/10 00:00 2k 139k +0,99 16.0-0 Nb4 17.Qb3 Qe8
5/10- 00:00 2k 145k -2,21 16.Qxe4 fxe4 17.Rd1 Rxd1+ 18.Kxd1
5/12 00:00 2k 179k -0,41 16.Rd1 Nb4 17.Rxd8+ Rxd8 18.Qb3
5/12 00:00 3k 204k +1,53 16.0-0 h6 17.Rfd1 Qe7 18.Rd5
6/12- 00:00 4k 209k -1,07 16.Qxe4 fxe4 17.e3
6/13 00:00 5k 227k +0,25 16.Rd1 Rxd1+ 17.Qxd1 Qxc4 18.0-0 Qxa2
6/13 00:00 5k 243k +1,30 16.0-0 Nb4 17.Qb3 h6 18.Rfd1 Kh7
7/13- 00:00 5k 247k -0,70 16.Qxe4 fxe4 17.e3 exf3 18.Bxf3 Qxc4 19.Bd5+
7/13 00:00 12k 284k +1,63 16.0-0 h6 17.Rad1 Nb4 18.Qb3 Rab8 19.e3
8/13- 00:00 12k 289k +0,23 16.Qxe4 fxe4 17.e3 exf3 18.Bxf3 Qxc4 19.Bxc6
8/21 00:00 16k 294k +1,63 16.0-0 h6 17.Rad1 Nb4 18.Qb3 Rab8 19.Rxd8+ Rxd8
9/21- 00:00 16k 292k +0,83 16.Qxe4 fxe4 17.e3 exf3 18.Bxf3 Qxc4 19.a3
9/21 00:00 70k 374k +1,51 16.0-0 Rd7 17.Rad1 Rad8 18.Rxd7 Rxd7 19.Re1 h6
10/21- 00:00 70k 373k +0,75 16.Qxe4 fxe4 17.e3 exf3 18.Bxf3 Qxc4 19.a3 Rab8
10/21 00:00 114k 427k +1,28 16.0-0 g5 17.h3 f4 18.gxf4 gxf4 19.Rad1 Nb4
11/21- 00:00 115k 425k +0,56 16.Qxe4 fxe4 17.e3 exf3 18.Bxf3 Qxc4 19.a3 Rab8
11/22 00:00 139k 444k +1,29 16.0-0 g5 17.h3 f4 18.gxf4 gxf4 19.Rad1 Nb4
12/22- 00:00 144k 438k +0,61 16.Qxe4 fxe4 17.e3 exf3 18.Bxf3 Qxc4 19.a3 Rab8
12/23 00:00 291k 532k +1,31 16.0-0 g5 17.h3 f4 18.gxf4 gxf4 19.Rad1 Nb4
13/23- 00:00 296k 526k +0,67 16.Qxe4 fxe4 17.e3 exf3 18.Bxf3 Qxc4 19.a3 Rab8
13/26 00:00 438k 559k +1,18 16.0-0 g5 17.h3 Nb4 18.Qc1 h6 19.a3 Nc6
14/26- 00:00 460k 554k +0,58 16.Qxe4 fxe4 17.e3 exf3 18.Bxf3 Qxc4 19.a3 Rab8
14/31 00:01 945k 711k +1,38 16.0-0 Nb4 17.Qc1 h6 18.a3 Nc6 19.Qc2 Nd4
15/31- 00:01 958k 700k +0,78 16.Qxe4 fxe4 17.e3 exf3 18.Bxf3 Qxc4 19.a3 Rab8
15/31 00:01 1 491k 753k +1,36 16.0-0 Nb4 17.Qc1 h6 18.a3 Nc6 19.Qc2 Nd4
16/31- 00:02 1 525k 741k +0,76 16.Qxe4 fxe4 17.e3 exf3 18.Bxf3 Qxc4 19.a3 Rab8
16/31 00:03 2 848k 855k +1,23 16.0-0 Nb4 17.Qc1 h6 18.Rd1 Rxd1+ 19.Qxd1 Qxc4
17/31- 00:03 3 012k 837k +0,63 16.Qxe4 fxe4 17.e3 exf3 18.Bxf3 Qxc4 19.a3 Rab8
17/34 00:06 5 591k 924k +1,32 16.0-0 Nb4 17.Qb3 a5 18.Rad1 Rxd1 19.Qxd1 Qxc4
18/34- 00:06 5 669k 921k +0,72 16.Qxe4 fxe4 17.e3 exf3 18.Bxf3 Qxc4 19.a3 Rab8
18/36 00:07 7 448k 938k +1,23 16.0-0 Nb4 17.Qb3 a5 18.Rad1 Rxd1 19.Qxd1 Qxc4
19/36- 00:08 7 766k 927k +0,63 16.Qxe4 fxe4 17.e3 exf3 18.Bxf3 Qxc4 19.a3 Rab8
19/36 00:22 23 416k 1 038k +1,25 16.0-0 Nb4 17.Qc1 h6 18.Re1 Rd7 19.a3 Nc6
20/36- 00:23 24 233k 1 032k +0,65 16.Qxe4 fxe4 17.e3 exf3 18.Bxf3 Qxc4 19.a3 Rab8
20/45 01:33 102 968k 1 107k +1,10 16.a3 Nd4 17.Nxd4 Rxd4 18.0-0 Qxc4 19.Qxc4+ Rxc4
20/45 01:57 132 612k 1 127k +1,47 16.0-0 Nb4 17.Qc1 h6 18.a3 Nc6 19.Qc2 Nd4
21/45- 01:58 133 079k 1 126k +0,87 16.Qxe4 fxe4 17.e3 exf3 18.Bxf3 Qxc4 19.a3 Rab8
21/45 02:06 143 207k 1 131k +1,35 16.0-0 Nb4 17.Qc1 h6 18.a3 Nc6 19.Qc2 Nd4
22/45- 02:09 146 303k 1 129k +0,75 16.Qxe4 fxe4 17.e3 exf3 18.Bxf3 Qxc4 19.a3 Rab8
22/46 02:58 201 315k 1 125k +1,49 16.0-0 Nb4 17.Qc1 h6 18.a3 Nc6 19.Qc2 Nd4
23/46- 03:04 205 923k 1 118k +0,89 16.Qxe4 fxe4 17.e3 exf3 18.Bxf3 Qxc4 19.a3 Rab8
23/46 03:45 247 697k 1 099k +1,48 16.0-0 Nb4 17.Qc1 h6 18.a3 Nc6 19.Qc2 Nd4
24/46- 03:49 251 493k 1 097k +0,88 16.Qxe4 fxe4 17.e3 exf3 18.Bxf3 Qxc4 19.a3 Rab8
24/46 04:49 313 298k 1 083k +1,44 16.0-0 Nb4 17.Qc1 h6 18.Rd1 Rxd1+ 19.Qxd1 Qxc4
25/46- 04:54 318 073k 1 081k +0,84 16.Qxe4 fxe4 17.e3 exf3 18.Bxf3 Qxc4 19.a3 Rab8
24/50 10:09 692 768k 1 136k +1,44 16.0-0 Nb4 17.e3 Nxf3+ 18.Bxf3 Qxc4 19.a3 Rab8
Best move: 0-0, Value: +1,44, Depth: 24/50, Time: 10:10,130, 692 767 891 Nodes, 1 136k