LC0 bad search and poor tactics

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mbabigian
Posts: 103
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Re: LC0 bad search and poor tactics

Post by mbabigian » Fri Jan 25, 2019 7:57 pm

I have moved zero goal posts -thank you. You can rail at the moon all you like and it doesn't change that a 1 node search doesn't "solve tactics." A typical queen sacrifice tactical position will not be "solved" by looking at all of the legal moves one side can play and getting a NN opinion back. The NN will look at positions where the queen is poorly placed and notice that its pattern matching shows that this is bad 99.999% of the time. This is why it avoids simple piece loss in most positions. In the case of a queen sacrifice tactical puzzle, it will come to the wrong conclusion because it has "solved no tactics" by looking at one ply.

And if I'm "hammering" anything it is that some focus must be given to the poor search design as smarter networks will not resolve poor search design. Something that appears to be of little focus considering the response to this post and these responses stand as plenty of evidence to support that conclusion.

So we agree. I have convinced no poster that the search is inadequate and you have failed to convince me that it is and that only smarter NNs are required to fix tactical blindness.

P.S. You test 10net and post results, don't suggest I do. If you can't be bothered to provide evidence for your own assertions, I certainly won't.

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M ANSARI
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Re: LC0 bad search and poor tactics

Post by M ANSARI » Fri Jan 25, 2019 8:03 pm

Chess in essence is a positional game while shallow tactics are just shortcuts to finish a game quicker. Of course missed tactics can destroy a game in one move sometimes, but I think you have to understand than NN chess is still in its infancy and there at the moment it plays chess totally differently to what we are used to. Lc0 obviously can still see some tactics, but probably not as well as the top AB engines that have had decades to tune this part of their game. I think sorting out the tactics will eventually come either by using some hybrid AB search or some different training schemes. I do notice some weird play in the endgame where there seems to be quicker and more forceful wins, but again this will come as the program matures. Remember Lc0 is using the GPU and so far the CPU is not really involved that much. I can easily see a situation where that formula changes. The GPU doing NN and the CPU doing AB ... would seem like a match made in heaven.

mbabigian
Posts: 103
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Location: US

Re: LC0 bad search and poor tactics

Post by mbabigian » Fri Jan 25, 2019 8:44 pm

M ANSARI wrote:
Fri Jan 25, 2019 8:03 pm
Chess in essence is a positional game while shallow tactics are just shortcuts to finish a game quicker. Of course missed tactics can destroy a game in one move sometimes, but I think you have to understand than NN chess is still in its infancy and there at the moment it plays chess totally differently to what we are used to. Lc0 obviously can still see some tactics, but probably not as well as the top AB engines that have had decades to tune this part of their game. I think sorting out the tactics will eventually come either by using some hybrid AB search or some different training schemes. I do notice some weird play in the endgame where there seems to be quicker and more forceful wins, but again this will come as the program matures. Remember Lc0 is using the GPU and so far the CPU is not really involved that much. I can easily see a situation where that formula changes. The GPU doing NN and the CPU doing AB ... would seem like a match made in heaven.
I agree with everything you said 100% and I stated that NN chess is in its infancy. I think the networks are making good progress, but the search is being largely ignored because it isn't the current "sexy" thing to work on. It will get attention eventually and then the play level will skyrocket.

jorose
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Re: LC0 bad search and poor tactics

Post by jorose » Fri Jan 25, 2019 9:09 pm

Funnily enough I think you chose an absolutely terrible position to claim Leela is bad at tactics.

It is to a large degree positional judgement to decide whether or not black can spend the tempi grabbing material. Imo, engines are not strong enough to see all the lines deep enough, its simply too complicated. The engines have to judge the dynamic chances for each side at some point in these lines and Leela is clearly on the materialistic side here.
-Jonathan

mirek
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Re: LC0 bad search and poor tactics

Post by mirek » Fri Jan 25, 2019 10:13 pm

mbabigian wrote:
Fri Jan 25, 2019 6:35 pm
Looking at positional patterns, there are certain patterns that lend themselves to tactics. This is the whole reason human players practice tactical puzzles to recognize these patterns. Steering to them or away from them depending on which side you are playing, improves play. You make a positional assessment and realize that those positions are likely to contain those types of tactics.
Wow this is quite incredible, so according to you smothered mate with Qg8+, Rxg8, Nf7#, or typical sac Bxh7+, Kxh7 Ng5+ or just plain simple fork etc. we should call them "positional" patterns? Well I guess it makes "sense" that you use "positional" patterns to solve tactical puzzles, doesn't it? (and similarly maybe one uses tactical patterns to solve positional puzzles? lol) Of course it comes down to how you define "tactics", but by any definition that is reasonable, fork can only be a tactical pattern.
Therefore: of course there are tactical patterns in chess and leela has already learned plenty of them. You can hardly have a #2 engine which is "tactically blind" - sure there may still be blindspots, but SF also has tactical blindspots where leela performs much better.

Also I guess you haven't tried your example line with antifish network? I was testing it with "AntiFish_Mark_125_1000_Steps" NN and here everything you say NN fails at it recognizes correctly. For example AF switches from f6 to a5 in ~8 seconds. And unlike SF (which evaluates f6 as even slight advantage for black at first, AF shows immediately score > 1.0, It also avoids 7. ... Bxc3 (wants Nf6 instead) doesn't play 9. Nd5 but b5. So I guess NN results depend on how well they are trained after all.

And BTW in chessbase live book 5. ... dxc4 scores 48% for black, which is the highest from all moves that have > 1000 games, so I guess you would have a hard case to prove that 5. ... dxc4 actually isn't the best move in the position. SF want's to play 5. ... c6 but what is the evidence that that isn't actually worse than dxc4? Because SF excels in closed positions? AF evaluates correctly the main line after 5. ... dxc4 as 0.4 advantage to white (after 7. ... Nf6) which is in agreement with SF, however considers c6 even worse. There may be some long term positional factors why it thinks so which maybe, just maybe SF isn't taking into consideration - or can you prove otherwise?

Dann Corbit
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Re: LC0 bad search and poor tactics

Post by Dann Corbit » Fri Jan 25, 2019 10:19 pm

The original conjecture is correct.

LC0 makes a horrible tactical blunder in this opening.

In this position, Leela played the atrocious f6, which bleeding edge stockfish never considers:
Searching: 0 1

Code: Select all

infinite: 0 time: 0 increment: 0 moves to go: 0

 1   +1.17   00:00   24219  Nc6 
 2   -1.20   00:00   63961  c6 Rae1 
 3   -1.12   00:00   92996  c6 Rae1 a5 
 4   -0.29   00:00  110371  Ne7 Bd3 Nd7 Ng5 Nc6 
 5   -0.05   00:00  145786  Ne7 Bb5+ Nbc6 Bxe7 Qxe7 
 6   -0.87   00:00  208741  Nc6 Rae1 Nce7 Bxe7 Nxe7 d5 exd5 
 7   -1.08   00:00  235806  Ne7 Rfe1 O-O d5 b5 Bxb5 Nxd5 Bxf8 Qxf8 Bc4 
 8   -1.08   00:00  293076  Ne7 Rfe1 O-O d5 b5 Bxb5 Nxd5 Bxf8 Qxf8 Bc4 
 9   -0.90   00:00  326021  Ne7 Rfe1 c6 Bd3 O-O Qb4 Re8 Rab1 g6 
10   -0.59   00:00  368942  Nc6 Rae1 Nce7 Bxe7 Nxe7 d5 exd5 
11   -0.45   00:00  459340  Nc6 Rfe1 Nce7 Rad1 O-O Bxd5 Nxd5 Bxf8 Qxf8 Ne5 Qe7 Qg3 
12   -0.30   00:00  621175  Nc6 Rad1 Nce7 Bxd5 Nxd5 Ne5 f6 f4 fxe5 fxe5 g6 
13   -0.36   00:00  843709  Nc6 Rfe1 Nce7 Rac1 O-O Bxd5 Nxd5 Bxf8 Qxf8 Ne5 f6 Nc4 Qe8 
14   -0.10   00:00  984328  Nc6 Rfe1 Nce7 Rac1 O-O Bxd5 Nxd5 Bxf8 Qxf8 g3 a5 Qc2 f6 
15   -0.94   00:00   2371K  a5 Rae1 a4 Qb5+ c6 Qb1 Ra5 Nd2 Ne7 Ne4 O-O Nd6 c5 Bxc5 Nd7 Nxc8 Qxc8 Bxe7 Qxc4 Bxf8 Nxf8 Qxb7 Qxd4 
16   -0.95   00:00   3351K  a5 Rae1 a4 Qb5+ c6 Qb1 Ra5 Qe4 Qf6 Qe2 Nd7 Qd2 b6 Ng5 Qf4 Qxf4 Nxf4 Ne4 Nf6 Nd6+ Kd7 Nxf7 
17   -0.70   00:00   4554K  a5 Rae1 a4 Qb5+ c6 Qb1 Ra5 Nd2 Ne7 Qb4 c5 dxc5 Nbc6 Qb2 O-O Ne4 Nf5 Nd6 Nxd6 cxd6 e5 f4 Re8 f5 Qf6 Bd3 
18   -0.69   00:00   6264K  a5 Rae1 a4 Qb5+ c6 Qb1 Ra5 Qe4 Nd7 Qg4 Qf6 Nd2 Qg6 Qf3 Qf6 Qh3 Nf4 Qg3 Rg5 Ne4 Rxg3 Nxf6+ Nxf6 fxg3 N4d5 Bd3 b5 Bd6 b4 Be5 
19   -0.92   00:01   9119K  a5 Rae1 a4 Qb5+ c6 Qb1 Ra5 Nd2 Ne7 Qb4 c5 dxc5 Nbc6 Qb2 O-O Ne4 Nf5 Nd6 Nxd6 cxd6 Bd7 Re3 e5 Rfe1 g6 Qxb7 Kh8 Rg3 
20   -0.79   00:01  11110K  a5 Rae1 a4 Qb5+ c6 Qb1 Ra5 Qe4 Ne7 Bb4 Rf5 Ne5 O-O g4 Nd5 Bd2 Rf6 Bd3 g6 Bg5 Nd7 f4 c5 Nxd7 Bxd7 
21   -0.95   00:02  19623K  a5 Ne5 Nb4 d5 exd5 Bxb4 axb4 Bxd5 O-O Bxf7+ Kh8 Rad1 Qf6 Qxb4 Nd7 Nxd7 Bxd7 Rxd7 Rxf7 Qxb7 Rff8 Qd5 Qc3 Re7 c6 Qb3 Qc5 Rb7 Qg5 Qb2 
22   -1.05   00:03  32016K  a5 Ne5 Nb4 d5 exd5 Bxb4 axb4 Bxd5 O-O Bxf7+ Kh8 Rad1 Qh4 g3 Qe7 Rfe1 Qc5 Rc1 Qd6 Qc4 Qf6 Qxb4 Rxf7 Nxf7+ Qxf7 Re7 Na6 Rxf7 Nxb4 Rcxc7 
23   -0.95   00:04  41223K  a5 Ne5 Ne7 Rad1 c6 Bxe6 Bxe6 Qxb7 Nd7 Nxd7 Bxd7 Rfe1 O-O Rxe7 Be6 Rxe6 fxe6 Bxf8 Kxf8 Re1 Qc8 Qb1 Kg8 Qe4 Rb8 g3 Rb2 Rc1 Qd7 Rxc6 Rxa2 
24   -0.89   00:05  56172K  c6 Rae1 a5 Ne5 f6 Bxd5 cxd5 Qb5+ Nc6 Nxc6 bxc6 Qxc6+ Bd7 Qxd5 Kf7 Qe4 Re8 Qxh7 Bc6 Re3 Rh8 Qc2 Qd5 Rg3 g5 Bc5 Rh4 Re1 
25   -1.09   00:12 116301K  c6 Rac1 a5 Bxd5 Qxd5 Qxd5 exd5 Rfe1+ Be6 Ng5 Na6 Nxe6 fxe6 Rxe6+ Kd8 Re7 Kc8 Rxg7 Nb4 Rb1 h5 h3 Rd8 Rh7 Rd7 Rxh5 Kc7 Rb2 b6 Rd2 Re8 f3 Rde7 Rh6 Kd7 Bxb4 axb4 
26   -0.95   00:13 133435K  c6 Rac1 Ne7 Ng5 O-O Rfe1 a5 Bxe6 Bxe6 Nxe6 fxe6 Qxe6+ Rf7 Bxe7 Qd7 d5 Qxe6 Rxe6 Rf5 Ba3 Nd7 dxc6 bxc6 Rcxc6 Rd5 f3 Ne5 Rcd6 Rxd6 Bxd6 Ng6 Bg3 Rd8 Rd6 Rxd6 
27   -0.72   00:16 157091K  c6 Rac1 a5 Bxd5 Qxd5 Qxd5 exd5 Ng5 Be6 Rce1 Nd7 f4 h6 Nxe6 fxe6 Rxe6+ Kd8 Rfe1 Ra6 Re7 Rg8 Rf7 Rb6 Ree7 Nf6 Rxb7 Rxb7 Rxb7 Re8 Kf2 Ne4+ Kf3 
28   -0.72   00:19 187852K  c6 Rac1 a5 Bxd5 Qxd5 Qxd5 exd5 Rfe1+ Be6 Ng5 Nd7 Nxe6 fxe6 Rxe6+ Kd8 Rce1 Ra6 Re7 g5 Rf7 Kc8 Ree7 Rd8 Rxh7 Rb6 Re1 Nf6 Rf7 Re8 Rc1 Ne4 f3 Nd2 
29   -0.80   00:26 251393K  c6 Rac1 a5 Bxd5 Qxd5 Qxd5 exd5 Rce1+ Be6 Ng5 Nd7 Nxe6 fxe6 Rxe6+ Kd8 Rfe1 Ra6 Re7 g5 Rf7 Re8 Rxe8+ Kxe8 Re7+ Kd8 Rxh7 c5 Bc1 g4 dxc5 Nxc5 Rh5 Ne4 Rxd5+ Rd6 Rxd6+ Nxd6 h3 gxh3 gxh3 Kd7 
30   -0.75   00:27 259553K  c6 Rac1 a5 Bxd5 Qxd5 Qxd5 exd5 Rfe1+ Be6 Ng5 Nd7 Nxe6 fxe6 Rxe6+ Kd8 Rce1 Ra6 Re7 g5 Rf7 Re8 Rxe8+ Kxe8 Re7+ Kd8 Rxh7 c5 dxc5 Re6 Kf1 Re4 Bc1 g4 Rh5 Rc4 Bd2 Ra4 a3 Rxa3 Rxd5 Ra2 
31   -0.87   00:36 346576K  c6 Rac1 a5 Bxd5 Qxd5 Qxd5 exd5 Rce1+ Be6 Ng5 b5 f4 b4 f5 bxa3 fxe6 f6 Nf7 Rg8 Nd6+ Ke7 Nf5+ Ke8 e7 Na6 Nd6+ Kd7 e8=Q+ Raxe8 Rxe8 Rxe8 Nxe8 Kxe8 Rf3 Nc7 Rxa3 Nb5 Rxa5 Nxd4 Ra8+ Kf7 Ra7+ Kg6 Kf2 Ne6 Rd7 
32   -0.74   00:46 450956K  c6 Rac1 a5 Bxd5 Qxd5 Qxd5 exd5 Ng5 Be6 Rce1 Nd7 Nxe6 fxe6 Rxe6+ Kd8 Rfe1 Nf6 Re7 Re8 Kf1 Rxe7 Rxe7 Rc8 Rxb7 Rc7 Rb6 Ne4 Ke2 Nc3+ Kd2 Ne4+ Ke3 Nc3 Ra6 Nxa2 Rxa5 Nc3 f3 Nb5 Bc5 
33   -0.78   00:54 530539K  c6 Rac1 a5 Bxd5 Qxd5 Qxd5 exd5 Ng5 Be6 Rce1 Nd7 f4 g6 f5 gxf5 Nxe6 fxe6 Rxe6+ Kd8 Rxf5 Ra6 Rf7 Kc8 Rd6 Rd8 h4 Rb6 Kh2 Rb1 Rh6 c5 Rhxh7 cxd4 Be7 Ne5 Bxd8 Nxf7 Rxf7 Kxd8 Rf5 Ke7 Rxd5 Rd1 h5 Ke6 Rxa5 
34   -0.86   01:07 655794K  c6 Rac1 a5 Bxd5 Qxd5 Qxd5 exd5 Rce1+ Be6 Ng5 Nd7 f4 g6 f5 gxf5 Nxe6 fxe6 Rxe6+ Kd8 Rxf5 Ra6 Rf7 Kc8 Rd6 Rd8 h4 Rb6 Kh2 Rb1 Rh6 c5 Rhxh7 cxd4 Be7 Ne5 Bxd8 Nxf7 Rxf7 Kxd8 Rf5 Ke7 Rxd5 Rd1 h5 Ke6 Rxa5 d3 
35   -0.78   01:27 861812K  c6 Rac1 a5 Bxd5 Qxd5 Qxd5 exd5 Rce1+ Be6 Ng5 c5 Nxe6 fxe6 Rxe6+ Kf7 Rb6 Ra7 Re1 Na6 Bxc5 Nxc5 dxc5 Rc8 Rb5 Rc7 Re5 d4 Rd5 Ra6 g3 Rac6 Rxa5 Ke6 Rxd4 Rxc5 Rxc5 Rxc5 a4 b5 Kg2 bxa4 Rxa4 Rc6 Ra7 Kf6 Kf3 Rc3+ Ke2 Rc2+ Ke3 h6 Ra6+ Kf7 h3 h5 Ra7+ Kf6 
36   -0.77   01:48   1069M  c6 Rac1 a5 Bxd5 Qxd5 Qxd5 exd5 Rce1+ Be6 Ng5 c5 Nxe6 fxe6 Rxe6+ Kf7 Rb6 Ra7 Re1 Na6 Bxc5 Nxc5 dxc5 Rc8 Rb5 d4 Kf1 d3 Re5 b6 Rxb6 Re7 Rf5+ Kg8 Rd6 g6 Rfd5 Rec7 Rxd3 Rxc5 Rd2 Rc2 Ke2 Kf7 h3 R8c4 a3 Rc7 a4 R7c4 Rxc2 Rxc2+ Ke3 
37   -0.87   02:46   1651M  c6 Rac1 Ne7 Rfe1 O-O Ng5 h6 Bxe6 Bxe6 Nxe6 fxe6 Qxe6+ Rf7 Bxe7 Qd7 d5 Qxe6 Rxe6 Nd7 dxc6 bxc6 Rcxc6 Rb8 Ba3 Rb1+ Rc1 Rxc1+ Bxc1 Nb6 Rc6 Rb7 f3 Nd5 Kf2 Rb1 Ba3 a5 Rc2 Kf7 Bc5 Nb4 Bxb4 axb4 g4 Kf6 Kg3 Ra1 Rc6+ Kf7 
38   -0.95   03:24   2037M  c6 Rac1 a5 Bxd5 Qxd5 Qxd5 exd5 Rce1+ Be6 Ng5 Nd7 f4 g6 f5 gxf5 Nxe6 fxe6 Rxe6+ Kd8 Rxf5 Ra6 Rf7 Kc8 Ree7 Rd8 Rxh7 Rb6 Re1 c5 Rh5 Nf6 Bxc5 Rb2 Rf5 Ne4 a3 Nxc5 Rc1 Kb8 Rxc5 Rb1+ Kf2 Rb2+ Kf3 Rg8 g3 Rxh2 Rfxd5 Rh3 Rg5 
39   -0.75   03:51   2294M  c6 Rac1 a5 Bxd5 Qxd5 Qxd5 exd5 Rce1+ Be6 Ng5 c5 Nxe6 fxe6 Rxe6+ Kf7 Rd6 Nc6 Rb1 Nb4 dxc5 Rhd8 Rxd8 Rxd8 Bxb4 axb4 Rxb4 Rd7 Kf1 Rc7 Rb5 Re7 a4 Kf6 h4 h6 h5 Ke5 Rb4 Rc7 f3 d4 Ke2 Rxc5 Kd2 Rc3 Rb5+ Kf6 Rxb7 Ra3 Ra7 
40   -0.78   04:37   2758M  c6 Rac1 a5 Bxd5 Qxd5 Qxd5 exd5 Rce1+ Be6 Ng5 c5 Nxe6 fxe6 Rxe6+ Kf7 Rd6 Nc6 Rb1 Nb4 dxc5 Rhd8 Rxd8 Rxd8 Bxb4 axb4 Rxb4 Rd7 Kf1 Rc7 Rb5 Ke6 Ke2 Kd7 a4 Kc6 f3 Rf7 Ke3 Re7+ Kd4 Re2 Rb6+ Kc7 g4 Rxh2 Re6 Rf2 Kxd5 Kd7 Rd6+ Kc8 a5 Rxf3 a6 bxa6 Rxa6 Rf4 Ra7 Rxg4 
41   -0.85   05:00   2982M  c6 Rac1 a5 Bxd5 Qxd5 Qxd5 exd5 Rce1+ Be6 Ng5 c5 Nxe6 fxe6 Rxe6+ Kf7 Rd6 Nc6 Rb1 Nb4 dxc5 Rhd8 Rxd8 Rxd8 Bxb4 axb4 Rxb4 Rd7 Kf1 Rc7 Rb5 Re7 a4 Kf6 Rb1 Rc7 Ke2 Rxc5 Rxb7 Rc2+ Ke3 Rc3+ Kd2 Ra3 Ra7 Ra2+ Ke3 d4+ Kxd4 Rxf2 a5 Rxg2 h3 Rh2 a6 Rxh3 Ra8 Ra3 Kc5 Ke7 Kb6 g5 Rh8 Kd6 Rxh7 
42   -0.86   06:08   3652M  c6 Rac1 a5 Bxd5 Qxd5 Qxd5 exd5 Rce1+ Be6 Ng5 c5 Nxe6 fxe6 Rxe6+ Kf7 Rd6 Nc6 Rb1 Nb4 dxc5 Rhd8 Rxd8 Rxd8 Bxb4 axb4 Rxb4 Rd7 Kf1 Rc7 Rb5 Re7 a4 Kf6 Rb1 Rc7 Ke2 Rxc5 Rb6+ Ke5 Rxb7 Rc2+ Ke3 d4+ Kd3 Rxf2 Re7+ Kd5 Rxg7 h6 Rg4 Kc5 h3 Ra2 Rxd4 Rxg2 Kc3 Rh2 Rc4+ Kd5 Kb4 Rb2+ Ka3 
And afterwards, the assessment:

Searching: 0 1

Code: Select all

infinite: 0 time: 0 increment: 0 moves to go: 0

 1   +4.26   00:00    6536  Rae1 
 2   +0.88   00:00   34249  Rfe1 c6 
 3   +0.84   00:00   64563  Rfe1 Kf7 Bxd5 Qxd5 Qxd5 exd5 Re7+ Kg6 
 4   +0.50   00:00   86140  Nd2 Nc6 Qf3 Kf7 
 5   +0.36   00:00  109932  Rfe1 Kf7 Bxd5 Qxd5 Qxd5 
 6   +0.26   00:00  133589  Rfe1 Kf7 Bxd5 Qxd5 Qxd5 
 7   +0.32   00:00  169930  Rae1 Kf7 Bxd5 Qxd5 Qxd5 exd5 Re7+ Kg6 
 8   +0.06   00:00  196006  Rae1 Kf7 Bxd5 Qxd5 Qxd5 exd5 Re7+ Kg6 
 9   +0.06   00:00  220032  Rae1 Kf7 Bxd5 Qxd5 Qxd5 exd5 Re7+ Kg6 Rxc7 Nc6 h3 Re8 Rb1 
10   +0.90   00:00  248834  Rfe1 Kf7 Bxd5 Qxd5 Qxd5 exd5 Re7+ Kg6 Rxc7 Nc6 
11   +0.13   00:00  283232  Rfe1 Kf7 Bxd5 Qxd5 Qxd5 exd5 Re7+ Kg6 Rxc7 h6 h3 Re8 Re1 Rxe1+ Nxe1 Na6 Re7 
12   +0.00   00:00  395591  Rfe1 Kf7 Bxd5 Qxd5 Qxd5 exd5 Re7+ Kg6 Rxc7 Nc6 Rb1 h6 h3 Rd8 Bc5 Re8 a4 
13   +0.00   00:00  476484  Rfe1 Kf7 Bxd5 Qxd5 Qxd5 exd5 Re7+ Kg6 Rxc7 h6 Re1 Nc6 h3 Rd8 Rb1 a6 Bc1 Kh7 Ba3 
14   +0.00   00:00  731525  Rfe1 Kf7 Bxd5 Qxd5 Qxd5 exd5 Re7+ Kg6 h3 h6 Rae1 Rd8 Rxc7 Nc6 Rb1 Na5 Re1 
15   +0.00   00:00  884401  Rfe1 Kf7 Bxd5 Qxd5 Qxd5 exd5 Re7+ Kg6 Rxc7 h6 Re1 Nc6 Rb1 Rd8 h3 Na5 Re1 Rd7 Re7 Rxe7 Bxe7 Be6 
16   -0.00   00:00   1106K  Rfe1 Kf7 Bxd5 Qxd5 Qxd5 exd5 Re7+ Kg6 Rxc7 h6 Re1 Nc6 h3 Rg8 Nh4+ Kh5 Nf3 Kg6 
17   -0.03   00:00   2006K  Rae1 Kf7 Bxd5 Qxd5 Qxd5 exd5 Re7+ Kg6 Rxc7 h6 h3 Nc6 Rb1 Rd8 Nh4+ Kh7 Nf3 a6 Rb6 
18   -0.06   00:00   2925K  Rfe1 Kf7 Bxd5 Qxd5 Qxd5 exd5 Re7+ Kg6 Rxc7 h6 h3 Rd8 Rb1 Nc6 Bc5 Re8 Rb5 Nd8 Re7 Rxe7 Bxe7 Ne6 Rxd5 Kf7 
19   -0.13   00:00   4498K  Rae1 Kf7 Bxd5 Qxd5 Qxd5 exd5 Re7+ Kg6 Rxc7 Nc6 h3 Rd8 Rb1 h6 Rb5 a6 Rb6 Re8 Bd6 Kh7 Kf1 Kg8 Bf4 Rf8 Be3 Rf7 Rxf7 Kxf7 
20   +1.29   00:00   7290K  Rae1 c6 Nd2 Kf7 Ne4 b5 Nd6+ Kg8 Bxd5 cxd5 Nxc8 Qxc8 Qxb5 Nc6 Rc1 
21   +1.25   00:02  21770K  Rae1 c6 Nh4 b5 Qg3 Kf7 Nf5 exf5 Bxd5+ cxd5 Re7+ Qxe7 Bxe7 Re8 Ba3 Be6 Rb1 Nd7 Rxb5 Nb6 Rb1 Bd7 Qd6 Re4 h4 Rxh4 Qc5 
22   +1.12   00:02  25173K  Rae1 c6 Nh4 b5 Qg3 Kf7 Nf5 exf5 Bxd5+ cxd5 Re7+ Qxe7 Bxe7 Be6 Ba3 Re8 Re1 Nd7 Qd6 Rad8 Qa6 Rc8 Bd6 Rc4 Qxb5 Rxd4 Qb7 Rc4 
23   +1.06   00:03  30517K  Rae1 c6 Nh4 b5 Qg3 Kf7 Nf5 exf5 Bxd5+ cxd5 Re7+ Qxe7 Bxe7 Be6 Bc5 Nd7 Re1 Nxc5 dxc5 Rhe8 Qc7+ Re7 Qd6 Rae8 c6 d4 Qxd4 Bxa2 Rxe7+ Rxe7 h3 Be6 Qc5 a6 Kh2 g5 c7 Re8 Qb6 Rc8 
24   +1.20   00:03  33109K  Rae1 c6 Nh4 b5 Qg3 Kf7 Nf5 exf5 Re7+ Qxe7 Bxd5+ cxd5 Bxe7 Be6 Bc5 Nd7 Re1 Nxc5 dxc5 Rhe8 Qc7+ Re7 Qd6 Rae8 h3 Rd7 Qc6 Rde7 Qxb5 d4 c6 Rc8 Rc1 Rec7 
25   +1.18   00:03  36584K  Rae1 c6 Nh4 b5 Qg3 Kf7 Nf5 exf5 Bxd5+ cxd5 Re7+ Qxe7 Bxe7 Be6 Bc5 Nd7 Re1 Nxc5 dxc5 Rhe8 Qc7+ Re7 Qd6 Rae8 c6 d4 Qxd4 Bxa2 Rxe7+ Rxe7 h3 Be6 Qc5 a6 Kh2 f4 c7 Bc8 
26   +1.33   00:04  45162K  Rae1 c6 Nh4 Kf7 Nf5 b5 Qg3 exf5 Re7+ Qxe7 Bxd5+ cxd5 Bxe7 Re8 Bc5 Na6 Qb3 Nxc5 dxc5 a6 c6 Be6 Qe3 d4 Qxd4 Bxa2 c7 
27   +1.37   00:05  54922K  Rae1 c6 Nh4 b5 Qg3 Kf7 Nf5 exf5 Bxd5+ cxd5 Re7+ Qxe7 Bxe7 Re8 Bc5 Be6 Qc7+ Nd7 Re1 Kg8 f4 Nxc5 dxc5 d4 Qc6 Rac8 Qxb5 Kf7 Rc1 Red8 Qd3 Rc6 Kf2 h6 a4 Rc7 a5 g5 fxg5 
28   +1.43   00:08  78692K  Rae1 c6 Nh4 b5 Qg3 Kf7 Nf5 exf5 Re7+ Qxe7 Bxd5+ cxd5 Bxe7 Re8 Ba3 Be6 Rb1 a6 Re1 Nd7 Qd6 Ra7 h4 g6 Kh2 a5 Bc5 Rb7 Qc6 Nxc5 dxc5 Rbe7 Qxb5 Rc8 Qxa5 d4 
29   +1.44   00:08  84491K  Rae1 c6 Nh4 b5 Qg3 Kf7 Nf5 exf5 Re7+ Qxe7 Bxd5+ cxd5 Bxe7 Re8 Ba3 Be6 Rb1 a6 Re1 Ra7 Qd6 Nd7 h4 a5 Bc5 Nxc5 Qxc5 Ree7 Qxb5 a4 Kh2 a3 f4 Rab7 Qa5 Rb2 Qxa3 Rd2 Qd6 Rxa2 
30   +1.42   00:13 137000K  Rae1 c6 Nh4 b5 Qg3 Kf7 Nf5 exf5 Bxd5+ cxd5 Re7+ Qxe7 Bxe7 Re8 Ba3 Be6 Rb1 a6 Re1 Nd7 Qd6 Nf8 Qc7+ Kg8 Bxf8 Kxf8 h3 Rac8 Qd6+ Kf7 Qxa6 Bd7 Rd1 Re6 Qb7 Rd6 Re1 Rc2 a3 f4 Kh2 Rc4 h4 g6 Qb8 Re6 Rxe6 
31   +1.54   00:17 174625K  Rae1 c6 Nh4 b5 Qg3 Kf7 Nf5 exf5 Bxd5+ cxd5 Re7+ Qxe7 Bxe7 Re8 Ba3 Be6 Rb1 a6 Re1 Nd7 Qd6 Nf8 Qc7+ Kg8 Bxf8 Kxf8 h3 Rac8 Qd6+ Kf7 Qxa6 Bd7 Rd1 Re4 Qd6 Bc6 Rc1 Re6 Qa3 f4 Qf3 Re4 
32   +1.78   00:25 254182K  Rae1 c6 Nh4 Kf7 Nf5 b5 Bxd5 cxd5 Qg3 exf5 Re7+ Qxe7 Bxe7 Re8 Ba3 Be6 Rb1 Nd7 Rxb5 a6 Rb1 Rab8 Re1 Rbc8 h4 Rc6 Rb1 g6 Rb7 Kg8 Kh2 Rec8 Bc5 Nxc5 dxc5 d4 h5 Bf7 Qd3 Rxc5 Qxd4 
33   +1.75   00:32 314117K  Rae1 c6 Nh4 Kf7 Nf5 b5 Bxd5 cxd5 Qg3 exf5 Re7+ Qxe7 Bxe7 Re8 Ba3 Be6 Rb1 a6 Re1 Nd7 Qd6 Ra7 h4 a5 Bc5 Nxc5 Qxc5 Ree7 Qxb5 a4 g3 Reb7 Qc6 Re7 Re3 Re8 Qb5 Ree7 Kg2 Reb7 Qc6 Re7 Qb6 Rab7 Qa5 Ra7 Qb4 Reb7 
34   +1.87   00:44 435620K  Rae1 c6 Nh4 Kf7 Nf5 b5 Bxd5 cxd5 Qg3 exf5 Re7+ Qxe7 Bxe7 Re8 Ba3 Be6 Rb1 a6 Re1 Nd7 Qd6 Ra7 h4 a5 Bc5 Nxc5 Qxc5 Ree7 Qxb5 a4 g3 Reb7 Qc6 Re7 Re3 g6 Kg2 h5 Qb6 Rab7 Qa5 Ra7 Qb4 g5 hxg5 fxg5 Re5 a3 Qb5 
35   +2.10   01:25 860903K  Rae1 c6 Nh4 b5 Qg3 Kf7 Nf5 exf5 Bxd5+ cxd5 Re7+ Qxe7 Bxe7 Re8 Ba3 Be6 Rb1 a6 Qd6 Nd7 Re1 Ra7 h4 a5 Bc5 Nxc5 Qxc5 Ree7 Qxb5 a4 g3 Reb7 Qc6 Re7 Re3 g6 Kg2 Re8 Qb5 g5 Qb6 Rae7 hxg5 fxg5 Qa5 h5 Qxa4 h4 gxh4 gxh4 Re5 Bd7 Rxe7+ Kxe7 
36   +2.15   01:43   1031M  Rae1 c6 Nh4 b5 Qg3 Kf7 Nf5 exf5 Bxd5+ cxd5 Re7+ Qxe7 Bxe7 Re8 Ba3 Be6 Rb1 a6 Qd6 Nd7 Re1 Ra7 h4 g6 h5 gxh5 Bb4 a5 Bd2 b4 Qh2 Kg6 Qg3+ Kf7 Qf3 Kg6 Qe3 Kg7 Qh6+ Kg8 Qxh5 Raa8 Qh2 Nf8 Qc7 Ng6 Qb6 Nf8 Bh6 Bf7 Rxe8 Rxe8 
37   +1.87   01:47   1077M  Rae1 c6 Nh4 b5 Qg3 Kf7 Nf5 exf5 Bxd5+ cxd5 Re7+ Qxe7 Bxe7 Re8 Ba3 Be6 Rb1 a6 Qd6 Nd7 Re1 Nf8 Qc7+ Kg8 Bxf8 Kxf8 h3 Rac8 Qd6+ Kf7 Qxa6 Bd7 Rb1 Rc6 Qb7 Re7 Kh2 Rd6 Rc1 Be8 Rc7 Red7 Qb8 Re6 Rb7 Re2 Rxd7+ Bxd7 Qb7 Ke7 Qxd5 Rc2 Qb3 Rc8 d5 Rc4 Qg3 g6 
38   +2.18   02:29   1502M  Rae1 c6 Nh4 b5 Qg3 Kf7 Nf5 exf5 Bxd5+ cxd5 Re7+ Qxe7 Bxe7 Re8 Ba3 Be6 Rb1 Kg8 Rxb5 Nc6 Rb7 Bf7 h3 Nd8 Rd7 Ne6 Bc5 a5 Qd6 f4 Qxd5 Ng5 Qc6 Rac8 Qb5 Bxa2 d5 f3 Qxa5 Bb1 d6 Be4 Be3 Nf7 Ra7 Nxd6 Qb4 Nf5 
39   +2.00   02:55   1754M  Rae1 c6 Nh4 b5 Qg3 Kf7 Nf5 exf5 Bxd5+ cxd5 Re7+ Qxe7 Bxe7 Re8 Ba3 Be6 Rb1 a6 Qd6 Nd7 Re1 Nf8 Qc7+ Kg8 Bxf8 Kxf8 h3 Rac8 Qd6+ Kf7 Qxa6 Bd7 Rb1 Re7 Qb7 Rc6 Kh2 Rd6 Rc1 Be8 Rc7 Red7 Qb8 Re6 Rb7 Re2 Rxd7+ Bxd7 Qb7 Ke7 Qxd5 g5 Qg8 h5 Qg7+ Ke6 
40   +2.32   04:20   2613M  Rae1 c6 Nh4 b5 Qg3 Kf7 Nf5 exf5 Re7+ Qxe7 Bxd5+ cxd5 Bxe7 Re8 Ba3 Be6 Rb1 a6 Qd6 Nd7 Re1 Ra7 h4 a5 Bc5 Nxc5 Qxc5 Ree7 Qxb5 a4 g3 Kg6 Re3 a3 Qb4 Reb7 Qd6 Bf7 Rxa3 Re7 Rxa7 Rxa7 a3 h5 Qb4 Rc7 a4 Rc4 Qb3 Rxd4 a5 Rd2 a6 d4 Qb7 
41   +2.12   04:53   2948M  Rae1 c6 Nh4 b5 Qg3 Kf7 Nf5 exf5 Re7+ Qxe7 Bxd5+ cxd5 Bxe7 Re8 Ba3 Be6 Rb1 Kg8 Rxb5 Nc6 Rb7 Bf7 h4 Nd8 Rd7 Ne6 Bc5 a5 Qd6 Nf8 Rb7 Rac8 Qb6 a4 Qb5 Ra8 Qc6 Red8 Bb6 Ne6 Rd7 Re8 Qxd5 Ng5 Qb7 Rab8 Qc6 Ne4 d5 
42   +2.38   06:48   4130M  Rae1 c6 Nh4 b5 Qg3 Kf7 Nf5 exf5 Re7+ Qxe7 Bxd5+ cxd5 Bxe7 Re8 Ba3 Be6 Rb1 a6 Qd6 Nd7 Re1 Ra7 h4 a5 Bc5 Nxc5 Qxc5 Ree7 Qxb5 a4 g3 Kg6 Re3 Kf7 Qc6 g6 Kg2 Re8 Qb5 h5 Qb4 Kg7 Qb6 Rae7 Qa5 Bf7 Rxe7 Rxe7 Qxa4 Re4 Qb4 g5 hxg5 fxg5 a4 f4 a5 fxg3 
43   +2.38   08:57   5425M  Rae1 c6 Nh4 b5 Qg3 Kf7 Nf5 exf5 Bxd5+ cxd5 Re7+ Qxe7 Bxe7 Re8 Ba3 Be6 Rb1 a6 Re1 Nd7 Qd6 Ra7 h4 a5 Bc5 Nxc5 Qxc5 Ree7 Qxb5 a4 g3 Kg6 Re3 Kf7 Qc6 Re8 Qb6 Rae7 Qa5 Bd7 Rc3 h6 h5 g5 a3 Kg7 Qxd5 Be6 Qd6 Bf7 Kg2 Bxh5 d5 Rf7 Qb6 f4 gxf4 gxf4 d6 
44   +2.40   12:38   7643M  Rae1 c6 Nh4 b5 Qg3 Kf7 Nf5 exf5 Bxd5+ cxd5 Re7+ Qxe7 Bxe7 Re8 Ba3 Be6 Rb1 a6 Re1 Ra7 Qd6 Nd7 h4 a5 Bc5 Nxc5 dxc5 d4 Qb6 Rae7 Qxb5 Rc8 Qxa5 Rec7 Qa6 Rc6 Qe2 Rd8 Qh5+ Kg8 Qf3 Bd5 Qxf5 Bxa2 Re7 Bf7 Rd7 Rf8 Rd6 Rc7 Rxd4 h6 Rd7 Rfc8 Rxc7 
45   +2.62   17:42  10703M  Rae1 c6 Nh4 b5 Qg3 Kf7 Nf5 exf5 Bxd5+ cxd5 Re7+ Qxe7 Bxe7 Be6 Re1 Nc6 Bc5 Rac8 Qd6 Rhe8 h4 Nd8 Bxa7 h5 Bc5 Ra8 a3 Kg6 Rb1 Nf7 Qc7 Rac8 Qg3+ Kh7 Rxb5 Nh6 Rb7 Bf7 f3 Re2 Kh2 Rce8 Qd6 Kg6 Qf4 Kh7 Rxf7 Nxf7 Qxf5+ Kh6 Bb4 Nd8 Bd2+ Rxd2 Qf4+ Kg6 Qxd2 Ne6 a4 Kf7 
Nodes: 10703573113
Nodes/second: 10077602
Best move: Rae1
Ponder move: c6
LC0 is dead, dead, dead.

The other conjecture, that LC0 made worse and worse moves as the game progressed is also correct.

Here is what we do not know, however...
What network was used?
What GPU was used?
What was the time control?
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.

Werewolf
Posts: 1197
Joined: Thu Sep 18, 2008 8:24 pm

Re: LC0 bad search and poor tactics

Post by Werewolf » Fri Jan 25, 2019 10:40 pm

Dann Corbit wrote:
Fri Jan 25, 2019 10:19 pm
The original conjecture is correct.

LC0 makes a horrible tactical blunder in this opening.

In this position, Leela played the atrocious f6, which bleeding edge stockfish never considers:
My Lc0 only considers ...f6 for 15 seconds and then wants ...a5.

Dann Corbit
Posts: 10130
Joined: Wed Mar 08, 2006 7:57 pm
Location: Redmond, WA USA
Contact:

Re: LC0 bad search and poor tactics

Post by Dann Corbit » Fri Jan 25, 2019 10:48 pm

The move a5 is correct. I suspect that the network or the GPU or the time control are a little scanty in the experiment.

Code: Select all

Searching: rnbqk2r/ppp2ppp/4p3/3n4/2BP4/BQ3N2/P4PPP/R4RK1 b kq - 0 1
infinite: 0 time: 0 increment: 0 moves to go: 0

 1   +1.17   00:00   24219  Nc6 
 2   -1.20   00:00   63961  c6 Rae1 
 3   -1.12   00:00   92996  c6 Rae1 a5 
 4   -0.29   00:00  110371  Ne7 Bd3 Nd7 Ng5 Nc6 
 5   -0.05   00:00  145786  Ne7 Bb5+ Nbc6 Bxe7 Qxe7 
 6   -0.87   00:00  208741  Nc6 Rae1 Nce7 Bxe7 Nxe7 d5 exd5 
 7   -1.08   00:00  235806  Ne7 Rfe1 O-O d5 b5 Bxb5 Nxd5 Bxf8 Qxf8 Bc4 
 8   -1.08   00:00  293076  Ne7 Rfe1 O-O d5 b5 Bxb5 Nxd5 Bxf8 Qxf8 Bc4 
 9   -0.90   00:00  326021  Ne7 Rfe1 c6 Bd3 O-O Qb4 Re8 Rab1 g6 
10   -0.59   00:00  368942  Nc6 Rae1 Nce7 Bxe7 Nxe7 d5 exd5 
11   -0.45   00:00  459340  Nc6 Rfe1 Nce7 Rad1 O-O Bxd5 Nxd5 Bxf8 Qxf8 Ne5 Qe7 Qg3 
12   -0.30   00:00  621175  Nc6 Rad1 Nce7 Bxd5 Nxd5 Ne5 f6 f4 fxe5 fxe5 g6 
13   -0.36   00:00  843709  Nc6 Rfe1 Nce7 Rac1 O-O Bxd5 Nxd5 Bxf8 Qxf8 Ne5 f6 Nc4 Qe8 
14   -0.10   00:00  984328  Nc6 Rfe1 Nce7 Rac1 O-O Bxd5 Nxd5 Bxf8 Qxf8 g3 a5 Qc2 f6 
15   -0.94   00:00   2371K  a5 Rae1 a4 Qb5+ c6 Qb1 Ra5 Nd2 Ne7 Ne4 O-O Nd6 c5 Bxc5 Nd7 Nxc8 Qxc8 Bxe7 Qxc4 Bxf8 Nxf8 Qxb7 Qxd4 
16   -0.95   00:00   3351K  a5 Rae1 a4 Qb5+ c6 Qb1 Ra5 Qe4 Qf6 Qe2 Nd7 Qd2 b6 Ng5 Qf4 Qxf4 Nxf4 Ne4 Nf6 Nd6+ Kd7 Nxf7 
17   -0.70   00:00   4554K  a5 Rae1 a4 Qb5+ c6 Qb1 Ra5 Nd2 Ne7 Qb4 c5 dxc5 Nbc6 Qb2 O-O Ne4 Nf5 Nd6 Nxd6 cxd6 e5 f4 Re8 f5 Qf6 Bd3 
18   -0.69   00:00   6264K  a5 Rae1 a4 Qb5+ c6 Qb1 Ra5 Qe4 Nd7 Qg4 Qf6 Nd2 Qg6 Qf3 Qf6 Qh3 Nf4 Qg3 Rg5 Ne4 Rxg3 Nxf6+ Nxf6 fxg3 N4d5 Bd3 b5 Bd6 b4 Be5 
19   -0.92   00:01   9119K  a5 Rae1 a4 Qb5+ c6 Qb1 Ra5 Nd2 Ne7 Qb4 c5 dxc5 Nbc6 Qb2 O-O Ne4 Nf5 Nd6 Nxd6 cxd6 Bd7 Re3 e5 Rfe1 g6 Qxb7 Kh8 Rg3 
20   -0.79   00:01  11110K  a5 Rae1 a4 Qb5+ c6 Qb1 Ra5 Qe4 Ne7 Bb4 Rf5 Ne5 O-O g4 Nd5 Bd2 Rf6 Bd3 g6 Bg5 Nd7 f4 c5 Nxd7 Bxd7 
21   -0.95   00:02  19623K  a5 Ne5 Nb4 d5 exd5 Bxb4 axb4 Bxd5 O-O Bxf7+ Kh8 Rad1 Qf6 Qxb4 Nd7 Nxd7 Bxd7 Rxd7 Rxf7 Qxb7 Rff8 Qd5 Qc3 Re7 c6 Qb3 Qc5 Rb7 Qg5 Qb2 
22   -1.05   00:03  32016K  a5 Ne5 Nb4 d5 exd5 Bxb4 axb4 Bxd5 O-O Bxf7+ Kh8 Rad1 Qh4 g3 Qe7 Rfe1 Qc5 Rc1 Qd6 Qc4 Qf6 Qxb4 Rxf7 Nxf7+ Qxf7 Re7 Na6 Rxf7 Nxb4 Rcxc7 
23   -0.95   00:04  41223K  a5 Ne5 Ne7 Rad1 c6 Bxe6 Bxe6 Qxb7 Nd7 Nxd7 Bxd7 Rfe1 O-O Rxe7 Be6 Rxe6 fxe6 Bxf8 Kxf8 Re1 Qc8 Qb1 Kg8 Qe4 Rb8 g3 Rb2 Rc1 Qd7 Rxc6 Rxa2 
24   -0.89   00:05  56172K  c6 Rae1 a5 Ne5 f6 Bxd5 cxd5 Qb5+ Nc6 Nxc6 bxc6 Qxc6+ Bd7 Qxd5 Kf7 Qe4 Re8 Qxh7 Bc6 Re3 Rh8 Qc2 Qd5 Rg3 g5 Bc5 Rh4 Re1 
25   -1.09   00:12 116301K  c6 Rac1 a5 Bxd5 Qxd5 Qxd5 exd5 Rfe1+ Be6 Ng5 Na6 Nxe6 fxe6 Rxe6+ Kd8 Re7 Kc8 Rxg7 Nb4 Rb1 h5 h3 Rd8 Rh7 Rd7 Rxh5 Kc7 Rb2 b6 Rd2 Re8 f3 Rde7 Rh6 Kd7 Bxb4 axb4 
26   -0.95   00:13 133435K  c6 Rac1 Ne7 Ng5 O-O Rfe1 a5 Bxe6 Bxe6 Nxe6 fxe6 Qxe6+ Rf7 Bxe7 Qd7 d5 Qxe6 Rxe6 Rf5 Ba3 Nd7 dxc6 bxc6 Rcxc6 Rd5 f3 Ne5 Rcd6 Rxd6 Bxd6 Ng6 Bg3 Rd8 Rd6 Rxd6 
27   -0.72   00:16 157091K  c6 Rac1 a5 Bxd5 Qxd5 Qxd5 exd5 Ng5 Be6 Rce1 Nd7 f4 h6 Nxe6 fxe6 Rxe6+ Kd8 Rfe1 Ra6 Re7 Rg8 Rf7 Rb6 Ree7 Nf6 Rxb7 Rxb7 Rxb7 Re8 Kf2 Ne4+ Kf3 
28   -0.72   00:19 187852K  c6 Rac1 a5 Bxd5 Qxd5 Qxd5 exd5 Rfe1+ Be6 Ng5 Nd7 Nxe6 fxe6 Rxe6+ Kd8 Rce1 Ra6 Re7 g5 Rf7 Kc8 Ree7 Rd8 Rxh7 Rb6 Re1 Nf6 Rf7 Re8 Rc1 Ne4 f3 Nd2 
29   -0.80   00:26 251393K  c6 Rac1 a5 Bxd5 Qxd5 Qxd5 exd5 Rce1+ Be6 Ng5 Nd7 Nxe6 fxe6 Rxe6+ Kd8 Rfe1 Ra6 Re7 g5 Rf7 Re8 Rxe8+ Kxe8 Re7+ Kd8 Rxh7 c5 Bc1 g4 dxc5 Nxc5 Rh5 Ne4 Rxd5+ Rd6 Rxd6+ Nxd6 h3 gxh3 gxh3 Kd7 
30   -0.75   00:27 259553K  c6 Rac1 a5 Bxd5 Qxd5 Qxd5 exd5 Rfe1+ Be6 Ng5 Nd7 Nxe6 fxe6 Rxe6+ Kd8 Rce1 Ra6 Re7 g5 Rf7 Re8 Rxe8+ Kxe8 Re7+ Kd8 Rxh7 c5 dxc5 Re6 Kf1 Re4 Bc1 g4 Rh5 Rc4 Bd2 Ra4 a3 Rxa3 Rxd5 Ra2 
31   -0.87   00:36 346576K  c6 Rac1 a5 Bxd5 Qxd5 Qxd5 exd5 Rce1+ Be6 Ng5 b5 f4 b4 f5 bxa3 fxe6 f6 Nf7 Rg8 Nd6+ Ke7 Nf5+ Ke8 e7 Na6 Nd6+ Kd7 e8=Q+ Raxe8 Rxe8 Rxe8 Nxe8 Kxe8 Rf3 Nc7 Rxa3 Nb5 Rxa5 Nxd4 Ra8+ Kf7 Ra7+ Kg6 Kf2 Ne6 Rd7 
32   -0.74   00:46 450956K  c6 Rac1 a5 Bxd5 Qxd5 Qxd5 exd5 Ng5 Be6 Rce1 Nd7 Nxe6 fxe6 Rxe6+ Kd8 Rfe1 Nf6 Re7 Re8 Kf1 Rxe7 Rxe7 Rc8 Rxb7 Rc7 Rb6 Ne4 Ke2 Nc3+ Kd2 Ne4+ Ke3 Nc3 Ra6 Nxa2 Rxa5 Nc3 f3 Nb5 Bc5 
33   -0.78   00:54 530539K  c6 Rac1 a5 Bxd5 Qxd5 Qxd5 exd5 Ng5 Be6 Rce1 Nd7 f4 g6 f5 gxf5 Nxe6 fxe6 Rxe6+ Kd8 Rxf5 Ra6 Rf7 Kc8 Rd6 Rd8 h4 Rb6 Kh2 Rb1 Rh6 c5 Rhxh7 cxd4 Be7 Ne5 Bxd8 Nxf7 Rxf7 Kxd8 Rf5 Ke7 Rxd5 Rd1 h5 Ke6 Rxa5 
34   -0.86   01:07 655794K  c6 Rac1 a5 Bxd5 Qxd5 Qxd5 exd5 Rce1+ Be6 Ng5 Nd7 f4 g6 f5 gxf5 Nxe6 fxe6 Rxe6+ Kd8 Rxf5 Ra6 Rf7 Kc8 Rd6 Rd8 h4 Rb6 Kh2 Rb1 Rh6 c5 Rhxh7 cxd4 Be7 Ne5 Bxd8 Nxf7 Rxf7 Kxd8 Rf5 Ke7 Rxd5 Rd1 h5 Ke6 Rxa5 d3 
35   -0.78   01:27 861812K  c6 Rac1 a5 Bxd5 Qxd5 Qxd5 exd5 Rce1+ Be6 Ng5 c5 Nxe6 fxe6 Rxe6+ Kf7 Rb6 Ra7 Re1 Na6 Bxc5 Nxc5 dxc5 Rc8 Rb5 Rc7 Re5 d4 Rd5 Ra6 g3 Rac6 Rxa5 Ke6 Rxd4 Rxc5 Rxc5 Rxc5 a4 b5 Kg2 bxa4 Rxa4 Rc6 Ra7 Kf6 Kf3 Rc3+ Ke2 Rc2+ Ke3 h6 Ra6+ Kf7 h3 h5 Ra7+ Kf6 
36   -0.77   01:48   1069M  c6 Rac1 a5 Bxd5 Qxd5 Qxd5 exd5 Rce1+ Be6 Ng5 c5 Nxe6 fxe6 Rxe6+ Kf7 Rb6 Ra7 Re1 Na6 Bxc5 Nxc5 dxc5 Rc8 Rb5 d4 Kf1 d3 Re5 b6 Rxb6 Re7 Rf5+ Kg8 Rd6 g6 Rfd5 Rec7 Rxd3 Rxc5 Rd2 Rc2 Ke2 Kf7 h3 R8c4 a3 Rc7 a4 R7c4 Rxc2 Rxc2+ Ke3 
37   -0.87   02:46   1651M  c6 Rac1 Ne7 Rfe1 O-O Ng5 h6 Bxe6 Bxe6 Nxe6 fxe6 Qxe6+ Rf7 Bxe7 Qd7 d5 Qxe6 Rxe6 Nd7 dxc6 bxc6 Rcxc6 Rb8 Ba3 Rb1+ Rc1 Rxc1+ Bxc1 Nb6 Rc6 Rb7 f3 Nd5 Kf2 Rb1 Ba3 a5 Rc2 Kf7 Bc5 Nb4 Bxb4 axb4 g4 Kf6 Kg3 Ra1 Rc6+ Kf7 
38   -0.95   03:24   2037M  c6 Rac1 a5 Bxd5 Qxd5 Qxd5 exd5 Rce1+ Be6 Ng5 Nd7 f4 g6 f5 gxf5 Nxe6 fxe6 Rxe6+ Kd8 Rxf5 Ra6 Rf7 Kc8 Ree7 Rd8 Rxh7 Rb6 Re1 c5 Rh5 Nf6 Bxc5 Rb2 Rf5 Ne4 a3 Nxc5 Rc1 Kb8 Rxc5 Rb1+ Kf2 Rb2+ Kf3 Rg8 g3 Rxh2 Rfxd5 Rh3 Rg5 
39   -0.75   03:51   2294M  c6 Rac1 a5 Bxd5 Qxd5 Qxd5 exd5 Rce1+ Be6 Ng5 c5 Nxe6 fxe6 Rxe6+ Kf7 Rd6 Nc6 Rb1 Nb4 dxc5 Rhd8 Rxd8 Rxd8 Bxb4 axb4 Rxb4 Rd7 Kf1 Rc7 Rb5 Re7 a4 Kf6 h4 h6 h5 Ke5 Rb4 Rc7 f3 d4 Ke2 Rxc5 Kd2 Rc3 Rb5+ Kf6 Rxb7 Ra3 Ra7 
40   -0.78   04:37   2758M  c6 Rac1 a5 Bxd5 Qxd5 Qxd5 exd5 Rce1+ Be6 Ng5 c5 Nxe6 fxe6 Rxe6+ Kf7 Rd6 Nc6 Rb1 Nb4 dxc5 Rhd8 Rxd8 Rxd8 Bxb4 axb4 Rxb4 Rd7 Kf1 Rc7 Rb5 Ke6 Ke2 Kd7 a4 Kc6 f3 Rf7 Ke3 Re7+ Kd4 Re2 Rb6+ Kc7 g4 Rxh2 Re6 Rf2 Kxd5 Kd7 Rd6+ Kc8 a5 Rxf3 a6 bxa6 Rxa6 Rf4 Ra7 Rxg4 
41   -0.85   05:00   2982M  c6 Rac1 a5 Bxd5 Qxd5 Qxd5 exd5 Rce1+ Be6 Ng5 c5 Nxe6 fxe6 Rxe6+ Kf7 Rd6 Nc6 Rb1 Nb4 dxc5 Rhd8 Rxd8 Rxd8 Bxb4 axb4 Rxb4 Rd7 Kf1 Rc7 Rb5 Re7 a4 Kf6 Rb1 Rc7 Ke2 Rxc5 Rxb7 Rc2+ Ke3 Rc3+ Kd2 Ra3 Ra7 Ra2+ Ke3 d4+ Kxd4 Rxf2 a5 Rxg2 h3 Rh2 a6 Rxh3 Ra8 Ra3 Kc5 Ke7 Kb6 g5 Rh8 Kd6 Rxh7 
42   -0.86   06:08   3652M  c6 Rac1 a5 Bxd5 Qxd5 Qxd5 exd5 Rce1+ Be6 Ng5 c5 Nxe6 fxe6 Rxe6+ Kf7 Rd6 Nc6 Rb1 Nb4 dxc5 Rhd8 Rxd8 Rxd8 Bxb4 axb4 Rxb4 Rd7 Kf1 Rc7 Rb5 Re7 a4 Kf6 Rb1 Rc7 Ke2 Rxc5 Rb6+ Ke5 Rxb7 Rc2+ Ke3 d4+ Kd3 Rxf2 Re7+ Kd5 Rxg7 h6 Rg4 Kc5 h3 Ra2 Rxd4 Rxg2 Kc3 Rh2 Rc4+ Kd5 Kb4 Rb2+ Ka3 
43   -0.87   09:40   5733M  c6 Rac1 a5 Bxd5 Qxd5 Qxd5 exd5 Rce1+ Be6 Ng5 c5 Nxe6 fxe6 Rxe6+ Kf7 Rd6 Re8 Bxc5 Na6 Rxd5 Nxc5 dxc5 Rac8 g3 Rc7 Rfd1 Re2 Rd7+ Rxd7 Rxd7+ Kf6 Rxb7 a4 Rb6+ Ke5 a3 Ra2 Rb7 Kf6 Ra7 Rxa3 h4 Rc3 Rxa4 Rxc5 Ra6+ Kf5 Ra7 Kf6 Rb7 h5 Rb6+ Kf7 Ra6 Rc3 Ra7+ Kf6 Kg2 g6 
44   -0.75   13:06   7804M  a5 Ne5 Nb4 d5 exd5 Bxb4 axb4 Bxd5 O-O Nxf7 Qf6 Nd6+ Kh8 Nxc8 Nc6 Bxc6 bxc6 Qxb4 Rfxc8 a4 h6 a5 Rcb8 Qc4 Qf5 a6 Rb6 a7 Rb7 Rfe1 Qf8 Qxc6 Raxa7 Rxa7 Rxa7 g3 Ra8 Qxc7 Qf5 Qe5 Rf8 Qxf5 Rxf5 Ra1 Kh7 Ra6 g5 g4 Rf4 h3 Kg7 Kg2 Rc4 f3 Rc7 Re6 Rd7 Kg3 
45   -0.73   18:50  11247M  a5 Ne5 Nb4 d5 exd5 Bxb4 axb4 Bxd5 O-O Nxf7 Qf6 Nd6+ Kh8 Nxc8 Nc6 Bxc6 bxc6 Qxb4 Rfxc8 a4 h6 a5 Rcb8 Qc4 Qf5 a6 Rb6 a7 Rb7 Rfe1 Qf8 Qxc6 Raxa7 Rxa7 Rxa7 g3 Ra8 Qxc7 Qf5 Qc4 Rc8 Qd4 Qf3 Qb2 Rd8 Qc2 Kg8 h3 Kh8 h4 Kg8 Qa2+ Kh8 Qe2 Qxe2 Rxe2 Rd5 Ra2 Kg8 Kg2 Kf7 Kf3 h5 Ra7+ Kf6 
Nodes: 11247650119
Nodes/second: 9948284
Best move: a5
Ponder move: Ne5
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.

Werewolf
Posts: 1197
Joined: Thu Sep 18, 2008 8:24 pm

Re: LC0 bad search and poor tactics

Post by Werewolf » Fri Jan 25, 2019 10:50 pm

mbabigian wrote:
Fri Jan 25, 2019 8:44 pm
M ANSARI wrote:
Fri Jan 25, 2019 8:03 pm
Chess in essence is a positional game while shallow tactics are just shortcuts to finish a game quicker. Of course missed tactics can destroy a game in one move sometimes, but I think you have to understand than NN chess is still in its infancy and there at the moment it plays chess totally differently to what we are used to. Lc0 obviously can still see some tactics, but probably not as well as the top AB engines that have had decades to tune this part of their game. I think sorting out the tactics will eventually come either by using some hybrid AB search or some different training schemes. I do notice some weird play in the endgame where there seems to be quicker and more forceful wins, but again this will come as the program matures. Remember Lc0 is using the GPU and so far the CPU is not really involved that much. I can easily see a situation where that formula changes. The GPU doing NN and the CPU doing AB ... would seem like a match made in heaven.
I agree with everything you said 100% and I stated that NN chess is in its infancy. I think the networks are making good progress, but the search is being largely ignored because it isn't the current "sexy" thing to work on. It will get attention eventually and then the play level will skyrocket.
The basic problem with your presentation of Lc0 is that it doesn't allow for time spent on the position. If Lc0 was JUST about spotting positional patterns, there would be no difference if it looked at 1000 nodes or 1 billion. But by playing lots of rollouts these quirky moves (tactics) do get an occasional look. It's not as efficient as SF etc for tactics, but it's not non-existent.

Dann Corbit
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Re: LC0 bad search and poor tactics

Post by Dann Corbit » Fri Jan 25, 2019 10:57 pm

The previous move by LC0 was also not very good, though not the horrific pratfall to come.

LC0 played Nd5, which Stockfish considers for less than one second before rejecting it.
LC0 lost around half a pawn by that choice.

Searching: 0 1

Code: Select all

infinite: 0 time: 0 increment: 0 moves to go: 0

 1   -1.26   00:00    3721  b5 Qxc3 bxc4 Qxc4 
 2   -0.37   00:00   22735  b5 Qxc3 bxc4 
 3   -0.82   00:00   58622  Nd5 Ba3 Ne7 
 4   -0.82   00:00   75622  Nd5 Ba3 Ne7 d5 
 5   -0.76   00:00   91447  Nd5 Ba3 c6 Rac1 a5 
 6   -0.78   00:00  124586  Nd5 Ba3 c6 Rac1 f6 Nd2 
 7   -0.65   00:00  146911  b5 Bd3 Nd5 Bxb5+ c6 Bc4 O-O Ba3 
 8   -0.49   00:00  180130  b5 Bd3 Nd5 Qxb5+ c6 Qa4 a5 Ne5 
 9   -0.44   00:00  200828  b5 Bd3 Nd5 Qxb5+ c6 Qa4 a5 Be4 O-O Qc2 Ba6 Bxh7+ Kh8 
10   -0.37   00:00  242390  b5 Bd3 Nd5 Qxb5+ Qd7 Qc5 Qd6 Qxd6 cxd6 Ba3 Ba6 Rfc1 Kd7 
11   -0.31   00:00  321959  b5 Bd3 Nd5 Bxb5+ c6 Ba4 O-O Ba3 Re8 Rab1 Ba6 Rfe1 Nb6 Ne5 Qc7 
12   -0.44   00:00  406497  b5 Bd3 Nd5 Bxb5+ c6 Ba4 O-O Ba3 Re8 Rfe1 Nd7 Bxc6 Rb8 Qc2 Bb7 
13   -0.62   00:00  877817  b5 Bd3 Nd5 Qxb5+ Bd7 Qc4 a6 a4 Nc6 Bd2 Rb8 Rfc1 O-O Rab1 Rxb1 Bxb1 
14   -0.66   00:00   1133K  Nd5 Ba3 a5 Ne5 Nb4 d5 exd5 Bxb4 axb4 Bxd5 O-O Bxf7+ Kh8 Rad1 Qf6 Qxb4 Nd7 Nxd7 Bxd7 Rxd7 Rxf7 Rxf7 Qxf7 Qxb7 Qxa2 
15   -0.72   00:00   1285K  Nd5 Ba3 a5 Rae1 a4 Qb5+ c6 Qb1 b5 Bxd5 Qxd5 Re5 Qd7 Ng5 Na6 Ne4 b4 Bxb4 Rb8 
16   -0.73   00:00   1371K  Nd5 Ba3 a5 Ne5 Nb4 d5 exd5 Bxb4 axb4 Bxd5 O-O Bxf7+ Kh8 Rad1 Qf6 Qxb4 Nd7 Nxd7 Bxd7 Rxd7 Rxf7 Rxf7 Qxf7 Qxb7 Qxa2 
17   -0.73   00:00   1600K  Nd5 Ba3 a5 Ne5 Nb4 d5 exd5 Bxb4 axb4 Bxd5 O-O Bxf7+ Kh8 Rad1 Qf6 Qxb4 Nd7 Nxd7 Bxd7 Rxd7 Rxf7 Rxf7 Qxf7 Qxb7 Qxa2 Qxc7 Qa5 Qc2 Qa4 
18   -0.65   00:00   2323K  b5 Bd3 Nd5 Qxb5+ Bd7 Qc4 a6 a4 Nc6 Ba3 Nce7 Rfe1 O-O Be4 Re8 Ne5 g6 Bxe7 Qxe7 Bxd5 exd5 
19   -0.47   00:00   4664K  b5 Bd3 Nd5 Qxb5+ Bd7 Qc4 O-O Bd2 Nc6 Ne5 Nxe5 dxe5 a5 Qg4 g6 Rfc1 Re8 Rab1 c6 Bc4 
20   -0.59   00:01   9402K  b5 Bd3 Nd5 Bxb5+ c6 Ba4 O-O Ba3 Re8 Ne5 Ba6 Rfe1 Nf4 Bc5 Nd7 Bxc6 Nxe5 dxe5 Nd3 Qa3 Nxe1 Rxe1 Bc4 Bxa8 Qxa8 Rc1 
21   -0.39   00:01  13934K  b5 Bd3 b4 Qxb4 Nd5 Qd2 Ba6 Bxa6 Nxa6 Ba3 f6 Qe2 Qc8 Rac1 Rb8 Rfe1 Kf7 Nd2 Nab4 Ne4 Rb6 
22   -0.37   00:02  26689K  b5 Bd3 b4 Qxb4 Nd5 Qa3 f6 Rb1 Nc6 Bd2 Qd6 Qa4 Kf7 Rfc1 Nce7 Qc2 Ba6 Be4 Rab8 Rxb8 Rxb8 Bxd5 Qxd5 Qxc7 
23   -0.44   00:04  38027K  b5 Bd3 b4 Qxb4 Nd5 Qb5+ Bd7 Qc4 O-O Qc2 f5 Ba3 Re8 Bc4 Nc6 Bxd5 exd5 Qc5 Qe7 Qxd5+ Be6 Qxc6 Qxa3 Rfe1 Qd6 Qc2 Bd5 Ne5 Qb4 Rad1 Qf8 Rc1 
24   -0.44   00:04  41723K  b5 Bd3 b4 Qxb4 Nd5 Qb5+ Bd7 Qc4 O-O Qc2 f5 Ba3 Re8 Rfe1 Nc6 Rac1 Ncb4 Bxb4 Nxb4 Qc4 Nxd3 Qxd3 Re7 Ne5 Be8 Qd2 Rb8 Rc4 a6 a4 Qd5 f3 Rd8 
25   -0.58   00:05  46578K  b5 Bd3 b4 Qxb4 Nd5 Qb5+ Bd7 Qc4 O-O Qc2 f5 Ba3 Re8 Rfe1 Nc6 Rac1 Ncb4 Bxb4 Nxb4 Qc4 Nxd3 Qxd3 Re7 Rc5 Rb8 Qc4 Qe8 Rc1 Bb5 Qc3 Rb7 Ne5 
26   -0.44   00:05  51915K  b5 Bd3 b4 Qxb4 Nd5 Qb5+ Bd7 Qc4 O-O Qc2 f5 Ba3 Re8 Rfe1 Nc6 Rac1 Ncb4 Bxb4 Nxb4 Qc4 Nxd3 Qxd3 Re7 Qc4 Rb8 Qxc7 Be8 Qc5 Rbb7 Qc3 Qd5 Qc8 Qxa2 Qa8 Qd5 
27   -0.56   00:16 155342K  b5 Bd3 b4 Qxb4 Nd5 Qa3 Qd6 Qb3 Nc6 Ne5 Nxe5 dxe5 Qb4 Qc2 Qc3 Bb5+ Bd7 Bxd7+ Kxd7 Qa4+ Qc6 Qd1 Rac8 Qf3 Ke8 Be3 a5 Rfc1 Qa4 h3 h6 Rab1 h5 Bc5 Qxa2 
28   -0.53   00:17 163562K  b5 Bd3 b4 Qxb4 Nd5 Qa3 Qd6 Qb3 Nc6 Ne5 Nxe5 dxe5 Qb4 Qc2 Qc3 Bb5+ Kf8 Qxc3 Nxc3 Ba3+ Kg8 Bc4 c6 Rfc1 Nd5 Bd3 Bd7 Rab1 a5 Bd6 h5 Be4 h4 Rb7 
29   -0.67   00:25 237772K  b5 Bd3 b4 Qxb4 Nd5 Qa3 Qd6 Qb3 Nc6 Ne5 Nxe5 dxe5 Qb4 Bb5+ Bd7 Bxd7+ Kxd7 Qc2 Rab8 Be3 Qc3 Qa4+ Qc6 Qg4 h5 Qf3 Ke8 Bxa7 Ra8 Rac1 Qa4 Bc5 Qf4 Qe2 Ra5 Rfd1 Qf5 a3 Qg6 h3 
30   -0.35   00:30 289777K  b5 Bd3 b4 Qxb4 Nd5 Qa3 Qd6 Qb3 Qb6 Qa4+ Bd7 Qd1 Qd6 Ne5 Nc6 Nc4 Qe7 Ba3 Ncb4 Ne3 Qd8 Nxd5 Nxd5 Re1 Rb8 Bc5 Bb5 Bxb5+ Rxb5 Qd3 Rb8 Qf3 Qd7 Bxa7 
31   -0.40   00:39 371345K  b5 Bd3 b4 Qxb4 Nd5 Qa4+ Bd7 Qd1 Nc6 Ba3 Ncb4 Bxb4 Nxb4 Be4 Rc8 Rb1 a5 a3 Bc6 Bxc6+ Nxc6 d5 Ne7 dxe6 Qxd1 exf7+ Kxf7 Rfxd1 Rhd8 Ne5+ Kf6 Re1 Rd5 Ng4+ Kf7 Rb3 Kg8 Ne5 c5 Rb7 Nf5 Nc4 Nd6 Nxd6 Rxd6 
32   -0.32   01:07 631777K  b5 Bd3 b4 Qxb4 Nd5 Qb3 O-O Be4 Nc6 Ba3 Re8 Qc2 f5 Bxf5 exf5 Qxc6 Be6 Rfe1 Qf6 Qc2 Bf7 Qd2 Nb6 Rec1 Nc4 Qd3 Nxa3 Qxa3 c6 Ne5 Bd5 Re1 f4 f3 Qg5 
33   -0.47   01:09 651654K  b5 Bd3 b4 Qxb4 Nd5 Qa4+ Bd7 Qc4 O-O Qc2 f5 Ba3 Re8 Rfe1 Nc6 Qd2 a6 Rac1 Rb8 Rc5 Nce7 Bc4 Rb6 Ne5 Bb5 Bb3 Ng6 g3 Nxe5 dxe5 Bc6 Rcc1 h6 Bc5 Rb7 Bc4 Qg5 f4 Qh5 
34   -0.38   01:12 683310K  b5 Bd3 b4 Qxb4 Nd5 Qa3 Qd6 Qb3 Nc6 Ne5 Nxe5 dxe5 Qb4 Qd1 Bd7 Rb1 Qa4 Rb3 c5 Qe2 h5 Ba3 Nf4 Qe3 Nxd3 Rxd3 O-O Qxc5 Rac8 Qe3 Bb5 Rd4 Qa5 Rc1 Rxc1+ Qxc1 Rb8 
35   -0.43   01:50   1036M  b5 Bd3 b4 Qxb4 Nd5 Qa3 Qd6 Qb3 Nc6 Ba3 Ncb4 Ne5 Rb8 Rfc1 O-O Be4 a5 Nc6 Rb6 Nxa5 Qf4 Qf3 Qxf3 Bxf3 Ba6 Bxd5 exd5 Rxc7 Re8 Bxb4 Rxb4 Nc6 Rc4 Ne7+ Kf8 Nxd5 Rxd4 Nc3 Re7 Rxe7 Kxe7 a4 Kd6 
36   -0.38   02:09   1219M  b5 Bd3 b4 Qxb4 Nd5 Qa3 Qd6 Qb3 Nc6 Ba3 Ncb4 Ne5 Rb8 Be4 O-O Rfc1 Ne7 Qc3 a5 Qxc7 Qxc7 Rxc7 Re8 Bxb4 Rxb4 Rac1 Ba6 Ra7 Bb5 Rxa5 f6 Nf3 Rb8 a3 Rb2 a4 Bc6 Bxc6 Nxc6 Rac5 Ne7 a5 Kf7 d5 Nxd5 a6 Ra2 Rc6 Rd8 
37   -0.32   03:11   1807M  b5 Bd3 b4 Qxb4 Nd5 Qa4+ Bd7 Qc4 O-O Qc2 f5 Ba3 Re8 Bc4 Nc6 Rfe1 Kh8 Bb3 Qf6 Rad1 a5 Qc5 Red8 Bxd5 exd5 Rc1 Qf7 Ne5 Nxe5 Rxe5 Re8 Qxc7 Rxe5 dxe5 Qe6 Qb7 Re8 Bb2 f4 Bd4 f3 Rc7 Qg6 
38   -0.47   03:25   1934M  b5 Bd3 b4 Qxb4 Nd5 Qa3 Qd6 Qb3 Nc6 Ne5 Nxe5 dxe5 Qb4 Qd1 Bd7 Rb1 Qa4 Rb3 c5 Qe2 h5 Re1 g6 Ba3 O-O Bxc5 Rfb8 Ra3 Qc6 Be3 Qb7 Rb3 Qc7 Bg5 Rxb3 axb3 Qb7 Bc4 a5 Rc1 Bc6 Qd2 a4 bxa4 Bxa4 Re1 Rb8 
39   -0.58   05:08   2898M  b5 Bd3 b4 Qxb4 Nd5 Qa3 Qd6 Qb3 Nc6 Ba3 Ncb4 Ne5 Rb8 Rfc1 O-O Be4 Ne7 Qc3 a5 Qxc7 Qxc7 Rxc7 Re8 Bxb4 axb4 h3 f6 Nd3 Nd5 Bxd5 exd5 Nf4 Be6 Re1 Bf7 Rxe8+ Rxe8 Rb7 b3 Rxb3 h6 Nd3 Re4 Rb4 Re2 a4 Ra2 Rb8+ Kh7 Nc5 Bg6 Rb7 
40   -0.64   06:40   3759M  b5 Bd3 b4 Qxb4 Nd5 Qb5+ Bd7 Qc4 O-O Qc2 f5 Ba3 Rf6 Rfe1 Bc6 Ne5 Qe8 Bc4 Ba4 Qe2 Nc6 Rac1 Rd8 Nf3 Qd7 Bc5 h6 Qd2 Rg6 h3 Rb8 Rb1 Rxb1 Rxb1 Nb6 Qe2 Nxc4 Qxc4 Qd5 Qxd5 exd5 Rb7 a5 
41   -0.45   09:31   5345M  b5 Bd3 b4 Qxb4 Nd5 Qa3 Qd6 Qb3 Nc6 Ne5 Nxe5 dxe5 Qb4 Bb5+ Bd7 Bxd7+ Kxd7 Qc2 Qc3 Qa4+ Qc6 Qg4 h5 Qe4 Qc3 Be3 Qb4 Qc2 Qc3 Qa4+ Qc6 Qe4 Ke8 Rfc1 Qd7 Bc5 f5 exf6 gxf6 Re1 Kf7 Rad1 Rag8 h3 a5 Rd3 Rg5 Ra3 Rhg8 Rf3 Rf5 Rxf5 
42   -0.42   12:29   7029M  b5 Bd3 b4 Qxb4 Nd5 Qa3 Qd6 Qb3 Nc6 Ba3 Ncb4 Ne5 Rb8 Bxb4 Qxb4 Qc2 Qd6 Rfc1 Bd7 Be4 Rd8 Rab1 h6 Rb7 O-O Rxa7 Nf6 Bf3 Qxd4 Qc5 Be8 g3 Ne4 Qxd4 Rxd4 Bxe4 Rxe4 Rc5 g5 Kg2 Ra4 Rxa4 Bxa4 Rxc7 f6 Ng6 Rb8 Ne7+ Kf8 Nc6 
43   -0.36   13:14   7455M  b5 Bd3 b4 Qxb4 Nd5 Qa3 Qd6 Qb3 Nc6 Ne5 Nxe5 dxe5 Qb4 Bb5+ Bd7 Bxd7+ Kxd7 Qc2 Qc3 Qa4+ Qc6 Qe4 Rab8 Rd1 Kc8 Be3 Rb4 Qf3 f5 exf6 gxf6 Bxa7 Qa4 Be3 Rg8 h3 Rc4 g3 Rd8 Rab1 Rb4 Rxb4 Qxb4 Bh6 Qa4 Qe2 Rd6 Rc1 Rc6 Rxc6 Qxc6 Qe4 f5 Qe5 Nc3 Bd2 
44   -0.42   21:38  12241M  b5 Bd3 b4 Qxb4 Nd5 Qa3 f6 Re1 Kf7 Qa4 Bd7 Qc4 Nc6 Be4 Nce7 Ba3 Rb8 Bxe7 Nxe7 Rac1 Rb6 Qxc7 Qxc7 Rxc7 Rd8 Rxa7 Rb4 h4 Ra4 Rc7 Rxa2 Rb1 h6 Rbb7 Ke8 h5 Ra1+ Kh2 Ra2 Bb1 Ra4 Bg6+ Nxg6 hxg6 Ke7 Kg3 Ra3 Kf4 Ra2 Ke3 
45   -0.42   26:38  15042M  b5 Bd3 b4 Qxb4 Nd5 Qa3 f6 Re1 Kf7 Qa4 Bd7 Qc4 Nc6 Be4 Nce7 Ba3 Rb8 Rac1 Re8 h3 Kg8 Bxe7 Nxe7 Qxc7 a5 Qc5 a4 Nd2 Rc8 Qd6 h6 Nf3 Nd5 Bxd5 Rxc1 Rxc1 exd5 Rc5 Be6 Qxd8 Rxd8 Ra5 Bd7 Rxd5 Kf7 Kh2 Ke7 Rc5 Rc8 Ra5 Rc1 Ra7 Rc2 
Nodes: 15042098867
Nodes/second: 9412948
Best move: b5
Ponder move: Bd3
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