Fizbo 1.9 released

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Tony P.
Posts: 81
Joined: Sun Jan 22, 2017 7:30 pm
Location: Russia

Re: Fizbo 1.9 released

Post by Tony P. » Tue Sep 19, 2017 11:48 pm

Here are a couple of quirks in the way Fizbo 1.9 writes PVs that are disturbing me.

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 :shock:

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
Again, I hope it's just a display artifact, not a search bug.

Dann Corbit
Posts: 9049
Joined: Wed Mar 08, 2006 7:57 pm
Location: Redmond, WA USA
Contact:

Re: Fizbo 1.9 released

Post by Dann Corbit » Tue Sep 19, 2017 11:56 pm

Probably a hash error.
It happens especially when the pv is reconstructed from the hash.
The entry gets overwritten.
Taking ideas is not a vice, it is a virtue. We have another word for this. It is called learning.
But sharing ideas is an even greater virtue. We have another word for this. It is called teaching.

Tony P.
Posts: 81
Joined: Sun Jan 22, 2017 7:30 pm
Location: Russia

Re: Fizbo 1.9 released

Post by Tony P. » Wed Sep 20, 2017 12:08 am

If these are indeed hash errors (with the hash size set to 2 GB), then it's surprising that Fizbo is the 6th strongest engine in the world - I've seen such erratic PVs (always involving obviously incorrect weird sacrifices) many times in fewer than 100 Fizbo games played on my laptop, primarily in early search iterations. What's strange, though, is that these errors have never led to blunders on Fizbo's side - it always managed to find (in the last iteration) and play a 'normal' move despite considering a weird sac in the penultimate iteration.

On a side note, one probable hash error that did lead to a blunder that I remember (46... Qe7??) was made by iCE 3, not Fizbo, and iCE doesn't make this blunder in postmortem analysis.

[pgn][Event "Computer chess game"]
[Date "2017.09.10"]
[White "Fire 5 x64 popcnt"]
[Black "Ice3-x64-modern"]
[Result "1-0"]
[ECO "A02"]
[Opening "Bird Opening"]
[Time "23:30:04"]
[Variation "1..Nf6 2.b3"]
[TimeControl "300+20"]
[Termination "normal"]
[PlyCount "100"]
[WhiteType "program"]
[BlackType "program"]

1. f4 Nf6 2. b3 b6 3. Bb2 Bb7 4. e3 g6 5. Nf3 Bg7 6. Be2 c5 7. g4 {(7.g4
Nc6 8.Rg1 h6 9.h4 d5 10.Bb5 a6 11.Bxc6+ Bxc6 12.h5 Nxh5 13.Ne5 e6 14.gxh5
Qh4+ 15.Ke2 Qxh5+ 16.Ke1 Qh4+ 17.Kf1 Qh3+ 18.Ke2) +0.02/13 3} h6 {(7. ...
h6 8.h4 d5 9.h5 g5 10.Nxg5 hxg5 11.fxg5 Qc7 12.Rh3 d4 13.gxf6 Bxf6 14.Bf3
Nc6 15.exd4 Nxd4 16.Bxb7 Qxb7 17.Nc3) +0.54/20 27} 8. f5 {(8.f5 g5 9.Rg1
Nc6 10.a4 d5 11.h3 0-0 12.h4 Nh7 13.Bxg7 Kxg7 14.hxg5 Nxg5 15.Nxg5 hxg5
16.Nc3 e6 17.d4) +0.03/14 4} O-O {(8. ... 0-0 9.Rg1 Ne4 10.Bxg7 Kxg7 11.d3
Ng5 12.Nc3 Nc6 13.Nxg5 hxg5 14.Ne4 Rh8 15.Nxg5 e6 16.Nf3 exf5 17.Kf2 fxg4)
+0.88/19 30} 9. Rg1 {(9.Rg1 e6 10.g5 hxg5 11.fxg6 fxg6 12.Rxg5 Nh5 13.Rxg6
Rxf3 14.Bxf3 Qh4+ 15.Ke2 Bxf3+ 16.Kxf3 Nc6 17.Qg1 e5 18.Nc3) -0.02/13 3}
Nh7 {(9. ... Nh7 10.Bxg7 Kxg7 11.Nc3 e6 12.Bd3 Nc6 13.a3 Ng5 14.Rf1 d5
15.Nxg5 Qxg5 16.f6+ Kg8 17.Qf3 Ne5 18.Qg3 Nxg4) +0.92/19 37} 10. Qc1
{(10.Qc1 e5 11.d3 Bxf3 12.Bxf3 Qh4+ 13.Rg3 Qxh2 14.Rg2 Qh1+ 15.Kd2 Qxc1+
16.Kxc1 Nc6 17.a3 Rad8 18.Bd5 Nf6 19.Bxc6 dxc6 20.fxg6 fxg6) -0.23/14 7} e5
{(10. ... e5 11.d3 Nc6 12.h4 d5 13.Nbd2 Qe7 14.g5 hxg5 15.hxg5 gxf5 16.Nh4
Nxg5 17.Nxf5 Qf6 18.Rf1 d4 19.exd4 cxd4) +0.96/19 27} 11. d3 {(11.d3 d5
12.h4 e4 13.dxe4 Bxb2 14.Qxb2 dxe4 15.fxg6 fxg6 16.Bc4+ Bd5 17.Bxd5+ Qxd5
18.Nfd2 Qf7 19.Rg2 g5 20.Nc3 gxh4 21.Ncxe4 Qg7 22.0-0-0 Qxb2+ 23.Kxb2 h3
24.Rf2 Rxf2) -0.16/15 3} Nc6 {(11. ... Nc6 12.h4 d5 13.Nbd2 Qe7 14.g5 hxg5
15.hxg5 gxf5 16.Nh4 Bc8 17.Ndf3 e4 18.g6 Nf6 19.gxf7+ Qxf7 20.Ng5 Qb7)
+0.93/19 25} 12. h4 {(12.h4 d5 13.Nc3 b5 14.e4 Nd4 15.g5 hxg5 16.Nxd5 Bxd5
17.exd5 Nxf5 18.hxg5 Qxd5 19.Nd2 Nd4 20.Ne4 Nxe2 21.Kxe2) -0.18/13 4} d5
{(12. ... d5 13.Nbd2 Qe7 14.g5 hxg5 15.hxg5 gxf5 16.Nh4 Qd7 17.g6 Nf6
18.gxf7+ Rxf7 19.Rg6 Ne7 20.Rg5 e4 21.d4 Ng4 22.dxc5) +1.02/20 32} 13. Nc3
{(13.Nc3 b5 14.fxg6 fxg6 15.g5 hxg5 16.a4 b4 17.Nd1 Qd6 18.Nxg5 e4 19.Rg2
Bxb2 20.Qxb2 Nxg5 21.Rxg5 d4) -0.20/13 3} d4 {(13. ... d4 14.Ne4 Ne7
15.fxg6 fxg6 16.h5 g5 17.exd4 exd4 18.c4 Nf6 19.Nxf6+ Rxf6 20.Rf1 Re6
21.Kd1 Re3) +1.01/17 22} 14. Ne4 {(14.Ne4 Nb4 15.c3 dxc3 16.Qxc3 Nf6
17.Nxf6+ Bxf6 18.g5 Bxf3 19.gxf6 Bxe2 20.Kxe2 Qxf6 21.Qxe5 Qxe5 22.Bxe5
Rfe8 23.d4 Nc2 24.Rad1 Kh7 25.f6 cxd4) -0.22/13 2} Ne7 {(14. ... Ne7
15.fxg6 fxg6 16.h5 g5 17.Nfd2 Nf6 18.Nxf6+ Rxf6 19.a4 Qd7 20.Ne4 Rf7
21.exd4 exd4 22.Kd2 Nd5 23.Rf1 Raf8) +1.16/19 26} 15. Nf2 {(15.Nf2 Nd5
16.e4 Nf4 17.Bf1 b5 18.Nh3 Qa5+ 19.Qd2 Qxd2+ 20.Kxd2 c4 21.Ba3 Rfc8 22.Nxf4
exf4 23.fxg6 fxg6 24.Bg2 cxd3 25.cxd3 a5) -0.01/14 6} a5 {(15. ... a5 16.e4
a4 17.h5 g5 18.bxa4 Rxa4 19.c3 Qa8 20.a3 dxc3 21.Qxc3 Nc6 22.Qb3 Ra6 23.Bd1
Nd4 24.Nxd4 exd4) +1.25/19 29} 16. e4 {(16.e4 a4 17.g5 hxg5 18.Nxg5 b5
19.bxa4 Rxa4 20.Nxh7 Kxh7 21.Qg5 Bh6 22.Qf6 Bg7 23.Qg5) 0.00/13 2} a4 {(16.
... a4 17.bxa4 Rxa4 18.c3 Qa8 19.cxd4 exd4 20.a3 Re8 21.Bd1 Ra5 22.Qd2 g5
23.hxg5 Nxg5 24.Nxg5 hxg5 25.Rh1 Nc6) +1.02/19 27} 17. g5 {(17.g5 hxg5
18.Nxg5 a3 19.Bxa3 Nxg5 20.Rxg5 Bh6 21.Rxg6+ Nxg6 22.Qxh6 Qxh4 23.Bc1 Qg3
24.Qg5 Qxg5 25.Bxg5 Nf4 26.Ng4 b5) +0.15/14 2} hxg5 {(17. ... hxg5 18.Nxg5
Qd6 19.fxg6 Nxg5 20.hxg5 f5 21.gxf6 Qxf6 22.Ng4 Qh4+ 23.Kd2 Nxg6 24.c4 Nf4
25.Rh1 Qg3 26.Rg1 Nxe2) +1.01/19 25} 18. Nxg5 {(18.Nxg5 axb3 19.cxb3 Qd6
20.Nxh7 Kxh7 21.Rg5 gxf5 22.exf5 Bh6 23.Ng4 Nxf5 24.Rh5 Rg8 25.Qc4 Qg6
26.Bc1 Nd6 27.Rxh6+ Qxh6 28.Nxh6) +0.26/13 2} Qd6 {(18. ... Qd6 19.bxa4
Rxa4 20.c3 Nxg5 21.Qxg5 Rfa8 22.fxg6 Qxg6 23.a3 dxc3 24.Bxc3 Rxa3 25.Rxa3
Rxa3 26.Bb2 Ra8 27.Nd1 Qxg5) +1.11/19 26} 19. fxg6 {(19.fxg6 fxg6 20.Ng4
Bc8 21.Nxh7 Kxh7 22.Qg5 Bxg4 23.Qxg4 axb3 24.axb3 Rxa1+ 25.Bxa1 Ra8 26.Bb2
Ra2 27.Bc1 Rxc2 28.Qg5 Kg8 29.Rf1) -0.01/14 10} fxg6 {(19. ... fxg6 20.Ng4
Nxg5 21.hxg5 Nc6 22.bxa4 Rxa4 23.c4 Qd8 24.a3 Rf4 25.Qc2 Qa8 26.Bc1 Rf8
27.Rb1 Qa5+ 28.Kd1 Bc8 29.Rh1) +1.07/20 25} 20. Ng4 {(20.Ng4 Bc8 21.Qb1 b5
22.Bc1 Qa6 23.Bd2 Nxg5 24.hxg5 axb3 25.cxb3 Bxg4 26.Bxg4 c4 27.dxc4 bxc4
28.Bb4) -0.06/12 3} Nxg5 {(20. ... Nxg5 21.hxg5 Nc6 22.bxa4 Rxa4 23.c4 Raa8
24.Nh6+ Bxh6 25.gxh6 Qf6 26.Kd1 Kh7 27.a3 Qh4 28.Rg4 Rf1+ 29.Bxf1 Qxg4+
30.Kc2) +1.09/20 23} 21. hxg5 {(21.hxg5 b5 22.Rh1 c4 23.Nf6+ Bxf6 24.gxf6
Qxf6 25.bxc4 bxc4 26.Qh6 Rf7 27.Kd1 Qg7 28.Qg5 c3 29.Bc1 Rb8) -0.28/13 6}
Rf4 {(21. ... Rf4 22.bxa4 Bc8 23.c4 Bd7 24.Kd2 Qc6 25.Qd1 Qxa4 26.Qxa4)
+0.97/20 43} 22. Qb1 {(22.Qb1 Rf7 23.Ba3 axb3 24.axb3 Nc6 25.Rh1 b5 26.Kd1
Kf8 27.Bc1 Qb8 28.Nf6 Rxa1 29.Qxa1 Nb4 30.Bg4 Bxf6 31.gxf6) +0.09/13 3} a3
{(22. ... a3 23.Bc1 Rff8 24.Nh6+ Kh7 25.Ng4 b5 26.Kd1 Kg8 27.Rh1) +1.14/23
25} 23. Bc1 {(23.Bc1 Rf7) -0.10/15 2} Rff8 {(23. ... Rff8 24.Rh1 Rf7 25.Bd2
b5 26.Nh6+ Bxh6 27.gxh6 Raf8 28.Qc1 b4 29.Bg5 Kh7 30.Kd2 Ng8 31.Qg1 Bc6
32.Kd1 Qb8 33.Rh2 Qc7 34.Rc1 Qb7) +1.14/23 24} 24. Bd2 {(24.Bd2 Rf7)
-0.05/13 1} b5 {(24. ... b5 25.Nh6+ Kh7 26.Ng4 b4 27.Rh1+ Kg8) +0.89/22 24}
25. Rh1 {(25.Rh1 Rf7) -0.13/14 2} Bc6 {(25. ... Bc6 26.Kd1 b4 27.Be1 Bd7
28.Nh6+ Bxh6 29.gxh6 Kh7 30.Qc1 Ng8 31.Qg5 Qf6 32.Qg2 Qf4 33.Bd2 Qf2 34.Qg5
Qf6 35.Qg3) +0.88/20 20} 26. Rh2 {(26.Rh2 Rf7) +0.14/12 2} Rf7 {(26. ...
Rf7 27.Rf2 b4 28.Rxf7 Kxf7 29.Kf2 Ke6 30.Qh1 Rh8 31.Nh6 Rf8+ 32.Kg3 Qd8
33.Rf1 Qe8 34.Rxf8 Qxf8 35.Ng4 Kd6 36.Qf3 Qxf3+ 37.Bxf3) +1.17/22 25} 27.
Nf6+ {(27.Nf6+) +0.21/15 1} Bxf6 {(27. ... Bxf6 28.gxf6 Qxf6 29.Qc1 c4
30.Bg5 Qd6 31.Bxe7 Qxe7 32.Qh6 Qf6 33.Rg2 Rg7 34.Rf2 Qe7 35.dxc4 Bxe4
36.cxb5 Qb4+ 37.Qd2 Qc5 38.Bc4+ Bd5 39.Bxd5+) +1.70/24 24} 28. gxf6
{(28.gxf6) +0.45/15 1} Qxf6 {(28. ... Qxf6 29.Qc1 c4 30.Bg5 Qd6 31.Bxe7
Qxe7 32.Qh6 Qf6 33.Rg2 Rg7 34.Rf2 Qe7 35.dxc4 Rf8 36.Rxf8+ Kxf8 37.cxb5
Bxe4 38.Rc1 Ke8 39.b6 Rh7 40.Bb5+) +0.73/24 27} 29. Qc1 {(29.Qc1 c4 30.Bg5
Qd6 31.Bxe7 Rxe7 32.Qh6 Qf6 33.dxc4 Qg7 34.Qg5 Rb7 35.0-0-0 Re8 36.Rf1 Rf7
37.cxb5 Rxf1+ 38.Bxf1 Bxe4 39.Bc4+ Kf8) +0.65/14 1} c4 {(29. ... c4 30.Bg5
Qd6 31.Bxe7 Qxe7 32.Qh6 Qf6 33.Rg2 Rg7 34.bxc4 bxc4 35.Rb1 Qf4 36.Qxf4 exf4
37.Rb6 cxd3 38.Bxd3 Rc8 39.Bc4+ Kf8 40.Rh2 Bd7 41.Rh8+ Ke7 42.Rxc8)
+1.25/25 24} 30. Bg5 {(30.Bg5 Qd6 31.Bxe7 Rxe7 32.Qh6 Qf6 33.dxc4 Qg7
34.Qh4 g5 35.Qg3 Bxe4 36.cxb5 Qf6 37.Rf2 Qg6 38.0-0-0 g4 39.Rdf1 Qh6+
40.Kd1 Bxc2+ 41.Kxc2) +0.57/15 1} Qd6 {(30. ... Qd6 31.Bxe7 Qxe7 32.Qh6 Qf6
33.Rg2 Rg7 34.bxc4 bxc4 35.Rf2 Qe7 36.Rb1 Rf8 37.Rxf8+ Qxf8 38.Bg4 Qf6
39.Rb8+ Kf7 40.Qh8 Qd6 41.Qc8 Kf6 42.Rb6 Rc7) +0.68/25 23} 31. Bxe7
{(31.Bxe7 Rxe7 32.Qh6 Qf6 33.dxc4 Qg7 34.Qh4 b4 35.c5 Kf7 36.0-0-0 Rf8
37.Rg1 Ke8 38.Qg4 Kd8 39.Ba6 Bd7 40.Qxg6 Qf6 41.Rhg2 Ref7 42.Bc4 Qxg6
43.Rxg6) +0.86/15 1} Qxe7 {(31. ... Qxe7 32.Qh6 Qf6 33.Rg2 Rg7 34.bxc4 bxc4
35.Rf2 Qe7 36.Rb1 Rf8 37.Rxf8+ Qxf8 38.Bg4 Qd6 39.Rb8+ Kf7 40.Qh8 c3 41.Rb6
Qc5 42.Rb8 Qe7 43.Qc8 Qd6) +0.32/25 38} 32. Qh6 {(32.Qh6 Rh7 33.Qxg6+ Qg7
34.Qe6+ Kh8 35.Rxh7+ Kxh7 36.0-0-0 Qh6+ 37.Qxh6+ Kxh6 38.dxc4 b4 39.Bd3 Rf8
40.Rg1 Bb7 41.Rg4 Rc8 42.Rg2 Rf8 43.Kd2 Rf6 44.c5 Rf4 45.Rh2+ Kg5) +0.32/14
1} Qf6 {(32. ... Qf6 33.Rg2 Rg7 34.bxc4 bxc4 35.Rf2 Qe7 36.Rb1 Rf8 37.Rxf8+
Qxf8 38.Bg4 Qf7 39.Rb8+ Be8 40.Qg5 Qe7 41.Qxe7 Rxe7 42.dxc4 Kf7 43.Kd2 Bc6
44.Kd3) +0.28/24 16} 33. Rg2 {(33.Rg2 Rg7 34.Rf2 Qe7 35.0-0-0 Rf8 36.Rxf8+
Qxf8 37.dxc4 Bxe4 38.cxb5 Rf7 39.Qg5 Rf2 40.Bc4+ Kh7 41.Qh4+ Qh6+ 42.Qxh6+
Kxh6 43.Bd3 Bxd3 44.Rxd3 Rf6 45.c4 Kg7 46.c5 Kf7) +0.47/14 2} Rg7 {(33. ...
Rg7 34.bxc4 bxc4 35.Rf2 Qe7 36.Rb1 Rf8 37.Rxf8+ Qxf8 38.Bg4 Qf7 39.Rb8+ Be8
40.Qg5 Qe7 41.Qxe7 Rxe7 42.dxc4 Kf7 43.Kd2 Kf6 44.Kd3 Kg5 45.Bh3 Kf4)
+0.27/25 29} 34. Rf2 {(34.Rf2 Qe7 35.Bg4 Rf8 36.Rxf8+ Kxf8 37.Ke2 Ke8
38.bxc4 bxc4 39.Rb1 Rg8 40.Rb8+ Kf7 41.Qh7+ Rg7 42.Qh8 cxd3+ 43.cxd3 Qc5
44.Be6+ Kxe6 45.Qxg7 Qc2+ 46.Ke1 Qc1+ 47.Kf2 Qe3+ 48.Kg2 Qxd3) +0.37/14 1}
Qe7 {(34. ... Qe7 35.bxc4 bxc4 36.Rb1 Rf8 37.Rxf8+ Qxf8 38.Bg4 Qf7 39.Rb8+
Be8 40.Qg5 Qe7 41.Qxe7 Rxe7 42.dxc4 Kf7 43.Kd2 Kf6 44.Kd3 Kg5 45.Bh3 Bc6
46.Rc8) +0.27/24 23} 35. Bg4 {(35.Bg4 Qd6 36.Rh2 Kf7 37.bxc4 bxc4 38.Rb1
Rag8 39.dxc4 Bxe4 40.Re2 Bc6 41.Qh2 Re8 42.Kd2 Qc5 43.Rb3 d3 44.Qf2+ Qxf2
45.Rxf2+ Kg8 46.cxd3) +0.64/13 1} cxd3 {(35. ... cxd3 36.cxd3 Rf8 37.Rxf8+
Kxf8 38.Ke2 Be8 39.Qh8+ Rg8 40.Rf1+ Bf7 41.Qh6+ Ke8 42.Qc1 Kf8 43.Qh6+)
0.00/25 43} 36. cxd3 {(36.cxd3) +0.46/15 3} Rf8 {(36. ... Rf8 37.Rxf8+ Kxf8
38.Ke2 Be8 39.Qh8+ Rg8 40.Rf1+ Bf7 41.Qh6+ Ke8 42.Qc1 Kf8 43.Qh6+) 0.00/28
29} 37. Rxf8+ {(37.Rxf8+ Kxf8 38.Ke2 Be8 39.Qh8+ Rg8 40.Rf1+ Bf7 41.Qh6+
Rg7 42.Bc8 b4 43.Rh1 Qe8 44.Ba6 Qe6 45.Qg5 Qe7 46.Rh8+ Rg8 47.Qh6+ Ke8
48.Rxg8+ Bxg8 49.Qxg6+ Bf7 50.Qh6 Qe6) +0.50/14 1} Kxf8 {(37. ... Kxf8
38.Ke2 Be8 39.Qh8+ Rg8 40.Rf1+ Bf7 41.Qh6+ Ke8 42.Qc1 Kf8 43.Qh6+) 0.00/34
23} 38. Ke2 {(38.Ke2 Be8 39.Qh8+ Rg8 40.Rf1+ Bf7 41.Qh6+ Rg7 42.Rf3 Kg8
43.Rh3 Kf8 44.Qc1 Be8 45.Rh8+ Rg8 46.Rh1 Rg7 47.Qh6 Bf7 48.Bc8 Qe8 49.Bh3
Qe7 50.Rc1 Be8 51.Qh8+ Rg8 52.Rf1+ Bf7 53.Qh6+ Ke8 54.Rc1 Be6 55.Rc6)
+0.55/15 1} Be8 {(38. ... Be8 39.Qh8+ Rg8 40.Rf1+ Bf7 41.Qh6+ Ke8 42.Qc1
Kf8 43.Qh6+) 0.00/34 22} 39. Rh1 {(39.Rh1 Bf7 40.Bc8 Qe8 41.Bh3 Qe7 42.Rc1
Be8 43.Qh8+ Rg8 44.Rf1+ Bf7 45.Qh6+ Rg7 46.Rh1 Be6 47.Bxe6 Qxe6 48.Qg5 Qe7
49.Rh8+ Kf7 50.Qg3 Rg8 51.Rxg8 Kxg8 52.Qxg6+ Qg7) +0.26/16 1} Bf7 {(39. ...
Bf7 40.Rf1 Kg8 41.Rh1 Kf8) 0.00/35 28} 40. Bc8 {(40.Bc8 Qe8 41.Bh3 Qe7
42.Rc1 Be8 43.Bc8 Kg8 44.Rf1 Bf7 45.Rh1 Kf8 46.Ba6 Qe6 47.Bxb5 g5 48.Qxe6
Bxe6 49.Bc4 Bxc4 50.dxc4 g4 51.b4 g3 52.Rg1 g2 53.c5) +0.35/17 2} b4 {(40.
... b4 41.Rf1 Kg8 42.Rh1 Kf8) 0.00/28 19} 41. Bg4 {(41.Bg4 Be6 42.Bh3 Bxh3
43.Qxh3 Rg8 44.Kd2 Kf7 45.Kc2 Qe8 46.Qh7+ Ke6 47.Rf1 Rf8 48.Rxf8 Qxf8
49.Qxg6+ Ke7 50.Qf5 Qxf5) +0.10/14 1} Be6 {(41. ... Be6 42.Bxe6 Qxe6 43.Qg5
Ke8 44.Rh8+ Kf7 45.Kd1 Qe7 46.Qg4 Qc7 47.Rc8 Qd6 48.Qf3+ Ke6 49.Qh3+ Kf6
50.Qf3+ Kg5 51.Qg3+ Kf6 52.Qf3+) 0.00/32 23} 42. Bh3 {(42.Bh3 Kf7 43.Rc1
Bd7 44.Rc4 Be8 45.Rc8 Kg8 46.Rb8 Qf7 47.Qg5 Qe7 48.Qh6) 0.00/14 1} Bxh3
{(42. ... Bxh3 43.Qxh3 Rg8 44.Rf1+ Kg7 45.Rh1 Kf6 46.Rf1+ Kg7) 0.00/33 28}
43. Qxh3 {(43.Qxh3 Rg8 44.Qh6+ Ke8 45.Qc1 Kf8 46.Rh2 Kf7 47.Rh7+ Rg7 48.Rh8
Qd7 49.Qc4+ Kf6 50.Rf8+ Rf7 51.Rxf7+ Qxf7 52.Qxb4 Qc7 53.Kd1 Qe7 54.Qd2 g5
55.Qh2 Kg6 56.Ke1 Qc7) +0.10/15 2} Rg8 {(43. ... Rg8 44.Rf1+ Kg7 45.Rh1 Kf6
46.Rf1+ Kg7) 0.00/35 20} 44. Qh6+ {(44.Qh6+ Ke8 45.Qc1 Kf8 46.Rh2 Kf7
47.Rh7+ Rg7 48.Rh8 Qd7 49.Qc4+ Kf6 50.Rf8+ Rf7 51.Rxf7+ Qxf7 52.Qxb4 Qc7
53.Kd1 Qe7 54.Qd2 Qd7 55.Qf2+ Kg7 56.Qg2 Qe7) +0.14/15 2} Ke8 {(44. ... Ke8
45.Qc1 Qd7 46.Kd2 Qe7 47.Ke2) 0.00/31 21} 45. Qc1 {(45.Qc1 Kf7) +0.01/15 1}
Qd7 {(45. ... Qd7 46.Kd2 Qe7 47.Ke2) 0.00/31 22} 46. Ke1 {(46.Ke1 Kf7)
+0.43/15 1} Qe7 {(46. ... Qe7 47.Rh7 Rg7 48.Qc6+ Qd7 49.Rh8+ Ke7 50.Qb6 Kf7
51.Ra8 Qg4 52.Qc7+ Kf6 53.Rf8+ Kg5 54.Qc1+ Qf4 55.Rxf4 exf4 56.Qc5+ Kg4
57.Qxb4 Rh7 58.Qxa3 Rh1+ 59.Kf2 Rh2+) -5.43/26 36} 47. Rh7 {(47.Rh7 Rg7
48.Rh8+ Kf7 49.Qc6 g5 50.Qc4+ Kg6 51.Qa6+ Kf7 52.Qc8 Rg6 53.Rh7+ Rg7 54.Rh6
Rg6 55.Qf5+ Qf6 56.Rxg6 Qxf5 57.exf5 Ke7 58.Re6+ Kf7 59.Rxe5 g4 60.Re6 g3
61.Rg6) +4.71/16 1} Rg7 {(47. ... Rg7 48.Qc6+ Qd7 49.Rh8+ Ke7 50.Qb6 Kf7
51.Rb8 Rh7 52.Rb7 Rh1+ 53.Kf2 Qxb7 54.Qxb7+ Kg8 55.Qd5+ Kh7 56.Qxe5 Ra1
57.Qxd4 Rxa2+ 58.Ke3 Rh2 59.Qxb4 a2 60.Qa5 g5 61.b4 Kg6 62.b5 Rb2 63.Qa6+
Kf7 64.Kd4) -8.28/32 34} 48. Rh8+ {(48.Rh8+) +5.45/16 2} Kf7 {(48. ... Kf7
49.Qc6 g5 50.Qc8 Rg6 51.Rh7+ Rg7 52.Rh6 Rg6 53.Qf5+ Rf6 54.Rh7+ Kg8 55.Rxe7
Rxf5 56.exf5 Kf8 57.Rxe5 Kg7 58.Rb5 Kf6 59.Rxb4 Kxf5 60.Rxd4 Kf6 61.Ke2 Kf5
62.Kf3 Kf6 63.Ra4 Ke5 64.Rxa3) -9.76/31 22} 49. Qc6 {(49.Qc6 Qe6 50.Rf8+
Kxf8 51.Qxe6 Rh7 52.Qd6+ Kg8 53.Qd8+ Kg7 54.Qe7+ Kg8 55.Qe8+ Kg7 56.Qxe5+
Kf7 57.Qc7+ Kg8 58.Qc4+ Kg7 59.Qxd4+ Kg8 60.Qg1 Kg7 61.Kf1 Kh6 62.Qe3+ g5
63.Qb6+ Kg7 64.Qxb4 Rh3 65.Qd6) +5.69/16 1} g5 {(49. ... g5 50.Qc8 Rg6
51.Rh7+ Rg7 52.Rh6 Rg6 53.Qf5+ Rf6 54.Rh7+ Kg8 55.Rxe7 Rxf5 56.exf5 Kf8
57.Rxe5 Kg7 58.Rb5 Kf6 59.Rxb4 Kxf5 60.Rxd4 Kf6 61.Ke2 Kf5 62.Kf3 Kf6
63.Ra4 Kf5 64.Ra5+ Kf6 65.Rxa3) -10.23/31 16} 50. Qc8 {(50.Qc8 g4 51.Qf5+
Qf6 52.Rf8+ Kxf8 53.Qxf6+ Kg8 54.Qxe5 Kh7 55.Qh2+ Kg6 56.Qd6+ Kh5 57.Qxd4
Rg8 58.Qxb4 Rc8 59.Qxa3 Rc2 60.Kf1 Kg5 61.d4 Kf4 62.e5 Kf5 63.Qa6) +5.87/16
1} g4 {(50. ... g4 51.Qf5+ Qf6 52.Rf8+ Kxf8 53.Qxf6+ Kg8 54.Qxe5 g3 55.Qb8+
Kh7 56.Kf1 Rf7+ 57.Kg2 Rf2+ 58.Kxg3 Rxa2 59.Qxb4 Kg6 60.Qxd4 Re2 61.Qb6+
Kf7 62.Qa7+ Ke6 63.Qxa3 Re3+ 64.Kf4 Rxd3 65.Qa6+ Rd6 66.Qc4+ Ke7 67.Qc5
Ke6) -10.75/31 21 Black resigns} 1-0[/pgn]

Tony P.
Posts: 81
Joined: Sun Jan 22, 2017 7:30 pm
Location: Russia

Re: Fizbo 1.9 released

Post by Tony P. » Wed Sep 20, 2017 12:29 am

Perhaps Fizbo's error occurs because the key length for one of the auxiliary hashes (most likely the material hash) is too small even when the TT is large.

Dann Corbit
Posts: 9049
Joined: Wed Mar 08, 2006 7:57 pm
Location: Redmond, WA USA
Contact:

Re: Fizbo 1.9 released

Post by Dann Corbit » Wed Sep 20, 2017 12:33 am

Tony P. wrote:Perhaps Fizbo's error occurs because the key length for one of the auxiliary hashes (most likely the material hash) is too small even when the TT is large.
The pv is probably not reconstructed until the very end of the search. When the pv was originally being formed, it is likely that the hash entries were correct.

This is actually a common programs for programs that recreate pvs from hash table afterwards.

That is why many of them also keep a triangular pv array to store it.
Taking ideas is not a vice, it is a virtue. We have another word for this. It is called learning.
But sharing ideas is an even greater virtue. We have another word for this. It is called teaching.

Tony P.
Posts: 81
Joined: Sun Jan 22, 2017 7:30 pm
Location: Russia

Re: Fizbo 1.9 released

Post by Tony P. » Wed Sep 20, 2017 1:34 am

Judging by the fact that the Qxe4 'PVs' like 21/45- are printed almost instantly after the previous search iteration ends, I'm afraid you're right.

Another clue is that Fizbo's TT has 'dense 8 byte entries' - it looks like the TT has no buckets (that Stockfish has) and, indeed, there's no insurance against the overwriting of PV nodes.

Tony P.
Posts: 81
Joined: Sun Jan 22, 2017 7:30 pm
Location: Russia

Re: Fizbo 1.9 released

Post by Tony P. » Wed Sep 20, 2017 2:48 am

Another instance of the same bug (here, 10... Bxg3? is suggested at 19/21+ and 20/37+):

[d]r1bqk2r/pp3ppp/2nbp3/2p2n2/8/NP3NP1/PBPP1PBP/R2Q1RK1 b kq - 1 10

Code: Select all

FEN: r1bqk2r/pp3ppp/2nbp3/2p2n2/8/NP3NP1/PBPP1PBP/R2Q1RK1 b kq - 1 10

Fizbo19x64:
 18	00:00	 1	21	+0,85	10. ... 0-0
 19/21+	00:00	 8k	338k	+1,45	10. ... Bxg3 11.fxg3 b5 12.Nxb5 Nfd4 13.Bxd4 cxd4 14.Nxa7
 19/37	01:28	 94 140k	1 064k	+0,85	10. ... 0-0 11.Nc4 Bb8 12.Re1 f6 13.Ba3 b5 14.Ne3
 20/37+	01:31	 96 555k	1 055k	+1,45	10. ... Bxg3 11.fxg3 b5 12.Nxb5 Nfd4 13.Bxd4 cxd4 14.Ng5
 20/42	02:23	 153 312k	1 071k	+0,59	10. ... f6 11.c3 e5 12.Nc2 h5 13.d4 h4 14.Re1
 21/42	02:46	 177 686k	1 067k	+0,78	10. ... f6 11.c3 e5 12.Nc4 0-0 13.d4 exd4 14.cxd4
 22/42	04:34	 292 615k	1 066k	+0,82	10. ... f6 11.c3 e5 12.Nc4 0-0 13.d4 exd4 14.cxd4
 23/47	17:36	 1 132 664k	1 072k	+1,02	10. ... f6 11.c3 0-0 12.d4 cxd4 13.Nxd4 Nfxd4 14.cxd4
 23/47	19:14	 1 235 291k	1 070k	+1,02	10. ... f6 11.c3 0-0 12.d4 cxd4 13.Nxd4 Nfxd4 14.cxd4
Best move: f6, Value: +1,02, Depth: 23/47, Time: 19:14,403, 1 235 290 643 Nodes, 1 070k
(The 2 GB hash was 65% full after 4.5 minutes of analysis.)

This example shows a more typical behaviour of the search function - namely, that a nonsensical variation only appears in a few early iterations and then vanishes.

The impact of the bug on the overall playing strength might be small to medium, though (fixing it may make Fizbo the 4th strongest but still not an equal rival to SF, Komodo and Houdini yet). Even if it occurs once per game or a few games, it just affects the move ordering in the search on that single move and usually results in a small, if any, inaccuracy played because of a slower (thus shallower) search than normal.

Tony P.
Posts: 81
Joined: Sun Jan 22, 2017 7:30 pm
Location: Russia

Re: Fizbo 1.9 released

Post by Tony P. » Wed Sep 20, 2017 4:02 am

I wonder if there's ever been a human master game where the eventual winner had 6 pawns fewer (not 6 pawns' worth of material but 6 pawns for piece(s)) at some point than the eventual loser (material imbalances FTW) :lol:

[pgn][Event "Computer chess game"]
[Date "2017.09.20"]
[White "Gull 3 x64"]
[Black "Fizbo19x64"]
[Result "0-1"]
[ECO "C63"]
[Opening "Spanish"]
[Time "06:39:16"]
[Variation "Schliemann, 4.Nc3 Nd4"]
[TimeControl "30/120:40/120:50/60"]
[Termination "normal"]
[PlyCount "88"]
[WhiteType "program"]
[BlackType "program"]

1. e4 Nc6 2. Bb5 e5 3. Nc3 f5 4. Nf3 Nd4 5. exf5 c6 6. Bd3 Nxf3+ 7. Qxf3
{(7.Qxf3 d5 8.0-0 Bd6 9.Be2 Nf6 10.d3 0-0 11.a4 Bd7 12.Re1 Bb4 13.Bd2 Qe7
14.Rad1 Ne8 15.g4 Nc7 16.Bf1 Rac8) +0.37/11 2} d5 {(7. ... d5 8.Qh5+ Kd7
9.b3 Kc7 10.f3 Nf6 11.Qh4) +0.20/14 8} 8. Qh5+ {(8.Qh5+ Kd7 9.b3 Kc7 10.f3
Nf6 11.Qg5 Bd6 12.Qxg7+ Kb8 13.g4 Rg8 14.Qh6 e4 15.fxe4 dxe4 16.Nxe4 Nxe4
17.Bxe4 Rxg4 18.d3) +0.27/14 9} Kd7 {(8. ... Kd7 9.b3 Kc7 10.f3 Nf6 11.Qh4
Be7 12.Kd1) +0.01/17 4} 9. b3 {(9.b3 Kc7 10.Bb2 e4 11.Be2 Nf6 12.Qg5 d4
13.Nd1 Kb8 14.0-0 h6 15.Qg6 Bc5 16.d3 Re8 17.Qxg7 Bxf5 18.Qxh6) +0.03/15
14} Kc7 {(9. ... Kc7 10.f3 Nf6 11.Qh4 Be7 12.Kd1 d4 13.Ne2) +0.04/17 4} 10.
Bb2 {(10.Bb2 Bd6 11.Ne2 Nf6 12.Qf7+ Qd7 13.Qxd7+ Bxd7 14.Ng3 e4 15.Be2 c5
16.0-0 Rhe8 17.a4 Be5 18.Bxe5+ Rxe5 19.f4 exf3 20.Rxf3) +0.02/15 3} Nf6
{(10. ... Nf6 11.Qg5 Be7 12.Qg3 Bd6 13.Qxg7+ Bd7 14.Qh6) +0.01/14 5} 11.
Qf7+ {(11.Qf7+ Bd7 12.f3 Bd6 13.0-0-0 Rf8 14.Qxg7 Rg8 15.Qh6 Rxg2 16.Rhg1
Rf2 17.Qh3 Qf8 18.Rde1 Rd8 19.Qg3) +0.27/14 3} Kb8 {(11. ... Kb8 12.Nd1 d4
13.f3 a6 14.b4 Bxb4 15.Nf2) +0.41/16 6} 12. f3 {(12.f3 b5 13.Ne2 d4 14.f4
a5 15.fxe5 Ra7 16.Qxa7+ Kxa7 17.exf6 gxf6 18.Bxd4+ c5 19.Be3 Qe8 20.Nc3 b4
21.Nb5+ Kb7 22.0-0 Bd7 23.a4 Bc6 24.Bf4 Rg8 25.Bg3 Qe5 26.Rfe1 Qd5 27.Be4)
+0.10/14 8} a5 {(12. ... a5 13.Ne2 d4 14.a4 b6 15.0-0 Ra7 16.Qc4) +0.42/16
5} 13. Ne2 {(13.Ne2 Qd6 14.f4 exf4 15.0-0 Ra7 16.Bxf6 b5 17.Be7 Rxe7 18.Qh5
Qe5 19.Nxf4 Re8 20.Kh1 Bc5 21.c3 Bd6 22.a4) +0.16/14 4} d4 {(13. ... d4
14.a4 b6 15.0-0 c5 16.Rae1 Ra7 17.Qc4) +0.37/16 5} 14. a4 {(14.a4 Ra7
15.Qc4 Ne8 16.Be4 Nd6 17.Qd3 b6 18.c3 Nxe4 19.Qxe4 c5 20.Ng3 Bd6 21.0-0-0
Rf8 22.Rhe1 Raf7 23.Kc2 Qg5 24.Qc6 Bc7) +0.15/15 2} b6 {(14. ... b6 15.f4
Ra7 16.Qc4 c5 17.fxe5 Ng4 18.Nxd4) +0.49/15 3} 15. Be4 {(15.Be4 Ra7 16.Qc4
Bc5 17.Bxc6 Rc7 18.Bb5 Nd5 19.Ng3 Ne3 20.dxe3 Bb4+ 21.Kf1 Rxc4 22.Bxc4 Bc3
23.Bxc3 dxc3 24.Bd3 Rf8 25.Kf2 Qh4 26.Rad1 Rd8) -0.18/15 9} Ra7 {(15. ...
Ra7 16.Qc4 Nxe4 17.fxe4 Ba6 18.Qxc6 Rd7 19.Qe6) +1.34/15 2} 16. Qc4
{(16.Qc4 Bc5 17.Bxc6 Rc7 18.Bb5 Nd5 19.Ng3 Ne3 20.dxe3 Bb4+ 21.Kf1 Rxc4
22.Bxc4 Bc3 23.Bxc3 dxc3 24.Bd3 Rf8 25.Kf2 Qh4 26.Rad1 Rd8) -0.18/14} Nxe4
{(16. ... Nxe4 17.fxe4 Ba6 18.Qxc6 Rd7 19.Qe6 Bd6 20.f6) +1.43/16 3} 17.
fxe4 {(17.fxe4 Bc5 18.Qd3 g6 19.Ng3 Rf8 20.0-0-0 Raf7 21.Qe2 Qh4 22.Rdf1
Qe7 23.Qd3 Bb4 24.h4 Bb7) -0.17/13} Ba6 {(17. ... Ba6 18.Qxc6 Rd7 19.Qe6
Bd6 20.f6 gxf6 21.c4) +1.43/17 9} 18. Qxc6 {(18.Qxc6 Rd7 19.Qe6 Bd6 20.f6
gxf6 21.Ng3 Re8 22.Qg4 Bb4 23.0-0-0 Qc8 24.Kb1 Rc7 25.Qxc8+ Rexc8 26.c4
dxc3 27.dxc3 Bxc3 28.Bxc3 Rxc3 29.Rd6 Rxb3+ 30.Ka2) -0.40/12 1} Rd7 {(18.
... Rd7 19.Qe6 Bd6 20.f6 gxf6 21.Rf1 Rf8 22.Rf2) +1.44/18 6} 19. Qe6
{(19.Qe6 Bb4 20.Qxe5+ Bd6 21.Qd5 Bg3+ 22.Nxg3 Rxd5 23.exd5 Re8+ 24.Kf2 Qd6
25.Rhe1 Qf4+ 26.Kg1 Rxe1+ 27.Rxe1 Qxd2 28.Rc1 Bb7 29.Nf1 Qf4 30.Ng3 Qe3+
31.Kh1 Qf2 32.Rf1 Qd2 33.f6 Bxd5) -0.87/14 1} Bb4 {(19. ... Bb4 20.Qxe5+
Bd6 21.Qxd4 Bb4 22.Qe5+ Ka8 23.0-0) +1.34/18 10} 20. Qxe5+ {(20.Qxe5+ Bd6
21.Qxd4 Bb4 22.Qe5+ Ka8 23.0-0-0 Bxe2 24.Qf4 Bxd1 25.Rxd1 Qc7 26.e5 Qc6
27.c3 Rc8 28.e6 Bd6 29.Qg4 Re7 30.c4 Bxh2 31.Rh1 Qc7 32.Ba3) -1.08/15 5}
Bd6 {(20. ... Bd6 21.Qxd4 Bb4 22.Qe5+ Ka8 23.0-0-0 Bxe2 24.Qf4) +1.47/17 4}
21. Qxd4 {(21.Qxd4 Bb4 22.Qe5+ Ka8 23.0-0-0 Bxe2 24.Qf4 Bxd1 25.Rxd1 Qc7
26.e5 Qc6 27.c3 Rc8 28.e6 Bd6 29.Qg4 Re7 30.c4 Bxh2 31.Rh1 Qc7 32.Ba3)
-1.08/14 0} Bb4 {(21. ... Bb4 22.Qe5+ Ka8 23.0-0-0 Bxe2 24.Qf4 Bxd1
25.Rxd1) +1.41/18 4} 22. Qe5+ {(22.Qe5+ Ka8 23.0-0-0 Bxe2 24.Qf4 Bxd1
25.Rxd1 Qc7 26.e5 Qc6 27.c3 Rc8 28.e6 Bd6 29.Qg4 Re7 30.c4 Bxh2 31.Rh1 Qd6
32.Bxg7 Rg8 33.f6 Rxe6 34.f7 Qa3+ 35.Kc2 Qa2+ 36.Kc1) -1.00/16 5} Ka8 {(22.
... Ka8 23.0-0-0 Bxe2 24.Qf4 Bxd1 25.Rxd1 Qc7 26.e5) +1.54/18 2} 23. O-O-O
{(23.0-0-0 Bxe2 24.Qf4 Bxd1 25.Rxd1 Qc7 26.e5 Qc6 27.c3 Rc8 28.e6 Bd6
29.Qg4 Re7 30.c4 Bxh2 31.Rh1 Qd6 32.Bxg7 Rg8 33.f6 Rxe6 34.f7 Qa3+ 35.Kc2
Qa2+ 36.Kc1) -1.08/14} Bxe2 {(23. ... Bxe2) +1.54/1 0} 24. Qf4 {(24.Qf4
Bxd1 25.Rxd1 Qc7 26.Qxc7 Rxc7 27.e5 h5 28.c3 Kb7 29.Kc2 h4 30.Kd3 Rd8+
31.Ke2 Bf8 32.Ke3 Kc6 33.d4 Bc5 34.Ke4 Rd5) -1.02/16 3} Bxd1 {(24. ...
Bxd1) +1.54/1 0} 25. Rxd1 {(25.Rxd1 Qc7 26.Qxc7 Rxc7 27.e5 h5 28.c3 Kb7
29.Kc2 h4 30.Kd3 Rd8+ 31.Ke2 Bf8 32.Ke3 Kc6 33.d4 Bc5 34.Ke4 Rd5) -1.02/16
0} b5 {(25. ... b5 26.axb5 Qb6 27.Qf1 Rc8 28.e5 Qc5 29.Qf3+) +1.72/16 2}
26. axb5 {(26.axb5 Qb6 27.Qf1 Rhd8 28.d4 Rxd4 29.Bxd4 Rxd4 30.e5 Rxd1+
31.Qxd1 Qe3+ 32.Kb1 Qxe5 33.Qd7 Qe1+ 34.Ka2 Qc3 35.Kb1 Ba3 36.Qc6+ Qxc6
37.bxc6 Bd6 38.g3 Kb8 39.Kc1) -0.38/13 3} Qb6 {(26. ... Qb6 27.Qf1 Rc8
28.e5 Qc5 29.c3 Qxe5 30.Kb1) +1.47/17 6} 27. Qf1 {(27.Qf1 Rhd8 28.c3 Qc7
29.Qc4 Bd6 30.Qxc7 Bxc7 31.d4 Kb7 32.c4 Rf7 33.g4 Bxh2 34.e5 Bf4+ 35.Kc2
Kb6 36.e6 Re7 37.d5) -0.44/17 8} Rc8 {(27. ... Rc8 28.e5 Qc5 29.Qf3+ Rb7
30.Qd3 Rxb5 31.Qe4+) +2.00/18 5} 28. Qe2 {(28.Qe2 a4 29.bxa4 Qa5 30.c3 Qxa4
31.e5 Ba3 32.Re1 Bxb2+ 33.Kxb2 Rc5 34.Qe4+ Qxe4 35.Rxe4 Rxd2+ 36.Ka3 Rxb5
37.e6 Rd1 38.Ka2 Rd6 39.Rb4 Rxb4 40.cxb4 Rd2+ 41.Ka3 Re2) -0.46/16 15} a4
{(28. ... a4 29.e5 Qa5 30.Qf3+ Rb7 31.Kb1 Qxb5 32.e6) +2.70/15 2} 29. bxa4
{(29.bxa4 Qa5 30.c3 Qxa4 31.e5 Ba3 32.Re1 Bxb2+ 33.Kxb2 Rc5 34.Qe4+ Qxe4
35.Rxe4 Rxd2+ 36.Kb3 Rxb5+ 37.Kc4 Rb8 38.g4 Rxh2 39.e6 Rd2 40.Rd4 Rc8+
41.Kd5 Re2 42.c4 Kb7 43.g5 Rd8+ 44.Kc5 Rxd4 45.Kxd4) -1.62/15 12} Qa5 {(29.
... Qa5 30.e5 Qxa4 31.d3 Qxb5 32.c4 Rb7 33.Qg4) +3.27/17 7} 30. c3 {(30.c3
Qxa4 31.e5 Ba3 32.Re1 Bxb2+ 33.Kxb2 Rc5 34.Qe4+ Qxe4 35.Rxe4 Rxd2+ 36.Kb3
Rxb5+ 37.Kc4 Rb8 38.g4 Rxh2 39.e6 Rd2 40.Rd4 Rc8+ 41.Kd5 Re2 42.c4 Kb7
43.g5 Rd8+ 44.Kc5 Rxd4 45.Kxd4) -1.62/14} Qxa4 {(30. ... Qxa4 31.f6 gxf6
32.Rf1 Rb7 33.Rxf6 Rxb5 34.Qg4) +3.80/17 4} 31. Re1 {(31.Re1 Qb3 32.e5 Rxd2
33.Qxd2 Bxc3 34.Bxc3 Rxc3+ 35.Qxc3 Qxc3+ 36.Kd1 Qb3+ 37.Kd2 Qb4+ 38.Kd1
Qb1+ 39.Kd2 Qxf5 40.e6 Qd5+ 41.Kc3 Qc5+ 42.Kd2 Qb4+ 43.Kd1 Qxb5 44.e7 Qe8
45.Kd2 Kb7 46.Re3 Kc7 47.Kc3 Kd6 48.Kc4 Qa4+ 49.Kd3) -2.52/16 22} Ba3 {(31.
... Ba3 32.e5 Rc4 33.Qf3+ Kb8 34.Qe3 Rb7 35.Bxa3) +5.76/15 3} 32. e5
{(32.e5 Rc4 33.Qe3 Bxb2+ 34.Kxb2 Qxb5+ 35.Kc2 Ra4 36.Qf3+ Ka7 37.Rb1 Ra2+
38.Kc1 Qxe5 39.Qf2+ Ka8 40.d4 Rxf2 41.dxe5 Rxf5 42.Rb5 Re7 43.Ra5+ Kb7
44.h3 Kb6 45.Ra8 Rexe5 46.g4 Rf2 47.Rb8+ Kc7) -4.85/17 11} Rc4 {(32. ...
Rc4 33.b6 Bxb2+ 34.Kxb2 Rc6 35.d4 Rxb6+ 36.Kc1) +9.62/15 2} 33. Qe3
{(33.Qe3 Bxb2+ 34.Kxb2 Qxb5+ 35.Kc2 Qa4+ 36.Kc1 Rcd4 37.cxd4 Rc7+ 38.Qc3
Qa1+ 39.Kc2 Rxc3+ 40.dxc3 Qxe1 41.Kb3 Qb1+ 42.Kc4 Qxf5 43.Kd5 Kb7 44.Kd6
Qf8+ 45.Kd5 Kc7 46.Ke4 Qf1 47.g3 Qe2+ 48.Kf4 Qf2+) -6.93/16 19} Bxb2+ {(33.
... Bxb2+ 34.Kxb2 Qxb5+ 35.Kc2 Qa4+ 36.Kc1 Qb3 37.Qf3+) +22.62/19 1} 34.
Kxb2 {(34.Kxb2 Qxb5+ 35.Kc2 Qa4+ 36.Kc1 Rcd4 37.cxd4 Rc7+ 38.Qc3 Qa1+
39.Kc2 Rxc3+ 40.dxc3 Qxe1 41.Kb3 Qb1+ 42.Kc4 Qxf5 43.Kd5 Kb7 44.Kd6 Qf8+
45.Kd5 Kc7 46.Ke4 Qf1 47.g3 Qe2+ 48.Kf4 Qf2+) -6.93/15} Qxb5+ {(34. ...
Qxb5+ 35.Kc1 Qb3) +99.63/18 9} 35. Kc2 {(35.Kc2 Qa4+ 36.Kc1 Rcd4 37.cxd4
Rc7+ 38.Qc3 Qa1+ 39.Kc2 Rxc3+ 40.dxc3 Qxe1 41.h4 Qxh4 42.Kd3 Qf2 43.g4 Qg3+
44.Kc4 Qxg4 45.Kd5 Qxf5 46.Kd6 Qf8+ 47.Kd7 Kb7 48.d5 Qc8+ 49.Ke7 Qxc3
50.Kd6 Qa3+ 51.Kd7 Qa4+ 52.Kd6 Qb4+ 53.Kd7 Qe4 54.Kd6 Qg4 55.e6 Qg3+ 56.Kd7
Qc7+ 57.Ke8 Qe5 58.e7 Qxd5 59.Kf8 Qd6) -8.44/16 13} Qa4+ {(35. ... Qa4+
36.Kc1 Qb3 37.Qb6 Qxb6 38.e6 Rxd2 39.Kxd2) +99.81/15 3} 36. Kc1 {(36.Kc1
Rcd4 37.cxd4 Rc7+ 38.Qc3 Qa1+ 39.Kc2 Rxc3+ 40.dxc3 Qxe1 41.h4 Qxh4 42.Kd3
Qf2 43.g4 Qg3+ 44.Kc4 Qxg4 45.Kd5 Qxf5 46.Kd6 Qf8+ 47.Kd7 Kb7 48.d5 Qc8+
49.Ke7 Qxc3 50.Kd6 Qa3+ 51.Kd7 Qa4+ 52.Kd6 Qb4+ 53.Kd7 Qe4 54.Kd6 Qg4 55.e6
Qg3+ 56.Kd7 Qc7+ 57.Ke8 Qe5 58.e7 Qxd5 59.Kf8 Qd6) -8.44/16} Qb3 {(36. ...
Qb3 37.Qb6 Qxb6 38.e6 Rxd2 39.Kxd2 Qb2+ 40.Ke3) +99.83/16 2} 37. Qb6
{(37.Qb6 Qxb6 38.e6 Rb7 39.Kc2 Qa5 40.g4 Qa4+ 41.Kd3 Rxg4 42.h3 Qb5+ 43.Kc2
Qxf5+ 44.Kd1 Qb1+ 45.Ke2 Qe4+ 46.Kf2 Rg2+ 47.Kf1 Qf3+) -M15/13 6} Qxb6
{(37. ... Qxb6) +99.83/1} 38. e6 {(38.e6 Rxd2 39.Kxd2 Qb2+ 40.Ke3 Qxc3+
41.Kf2 Qd2+ 42.Re2 Qf4+ 43.Kg1 Rc1+ 44.Re1 Rxe1+) -M11/15 2} Rxd2 {(38. ...
Rxd2 39.Kxd2 Qb2+ 40.Ke3 Qxc3+ 41.Kf2 Rf4+ 42.Ke2) +99.87/16 3} 39. Kxd2
{(39.Kxd2 Qb2+ 40.Ke3 Qxc3+ 41.Kf2 Qd2+ 42.Re2 Qf4+ 43.Kg1 Rc1+ 44.Re1
Rxe1+) -M10/17 0} Qb2+ {(39. ... Qb2+ 40.Ke3 Qxc3+ 41.Kf2 Rf4+ 42.Ke2 Re4+
43.Kf2) +99.89/19 2} 40. Ke3 {(40.Ke3 Qxc3+ 41.Kf2 Qd2+ 42.Re2 Qf4+ 43.Kg1
Rc1+ 44.Re1 Rxe1+) -M9/19 1} Qxc3+ {(40. ... Qxc3+ 41.Kf2 Rf4+ 42.Ke2 Re4+
43.Kf2 Qxe1+ 44.Kf3) +99.91/29 2} 41. Kf2 {(41.Kf2 Qd2+ 42.Re2 Qf4+ 43.Kg1
Rc1+ 44.Re1 Rxe1+) -M8/20 1} Rf4+ {(41. ... Rf4+ 42.Ke2 Re4+ 43.Kf2 Qxe1+
44.Kf3 Qe3+) +99.93/46 0} 42. Ke2 {(42.Ke2 Re4+ 43.Kf2 Qxe1+ 44.Kf3 Qe3+)
-M7/22 1} Re4+ {(42. ... Re4+ 43.Kf2 Qxe1+ 44.Kf3 Qe3+) +99.95/46 0} 43.
Kf2 {(43.Kf2 Qxe1+ 44.Kf3 Qe3+) -M6/32 1} Qxe1+ {(43. ... Qxe1+ 44.Kf3
Qe3+) +99.97/46 0} 44. Kf3 {(44.Kf3 Qe3+) -M6/6} Qe3# {(44. ... Qe3+)
+99.99/46 0} 0-1[/pgn]

Dann Corbit
Posts: 9049
Joined: Wed Mar 08, 2006 7:57 pm
Location: Redmond, WA USA
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Re: Fizbo 1.9 released

Post by Dann Corbit » Wed Sep 20, 2017 5:34 am

I only trust the first few nodes of any pv anyway. Though it is really nice to get a clear and logical plan and it is also disappointing to get illegal moves in a pv.
Taking ideas is not a vice, it is a virtue. We have another word for this. It is called learning.
But sharing ideas is an even greater virtue. We have another word for this. It is called teaching.

cc2150dx
Posts: 164
Joined: Sat Nov 30, 2013 8:51 am
Location: Canada

Re: Fizbo 1.9 released

Post by cc2150dx » Wed Dec 06, 2017 8:28 pm

All download links have disappeared. Does someone have an alternative download link?

Thanks,
Play + Study + Think + Learn + Analyze = Chess !!

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