I have improved some variants in the Predator book (but I'm still waiting for the update because I want to import more games). However, it is not always easy. The engines also make gross mistakes, especially in blitz. It's not always the books. The mistakes I saw were made by the engines, and most of all, gross mistakes.mehmet1921 wrote: ↑05/09/2021, 8:40 Predator.bin vs DONBFupdate1.bin:
Program Elo + - Games Score Av.Op. Draws
1 Cfish 130721 P : 2402 7 7 320 50.5 % 2398 96.6 %
2 Cfish 130721 D : 2398 7 7 320 49.5 % 2402 96.6 %
Individual statistics:
1 Cfish 130721 P : 2402 320 (+ 7,=309,- 4), 50.5 %
Cfish 130721 D : 320 (+ 7,=309,- 4), 50.5 %
2 Cfish 130721 D : 2398 320 (+ 4,=309,- 7), 49.5 %
Cfish 130721 P : 320 (+ 4,=309,- 7), 49.5 %
Game Conditions: Cutechess Gui, 1 Core (Core-i7 9750h), 3 min TC, 512 Mb Hash, Ponder Off, BestMove=Off / BookDepth=Max
Cfish 130721 P (Predator: Eduard Nemeth), Cfish 130721 D ( DONBFupdate1:Vasid Chouhan)
https://www.mediafire.com/file/k6ug4k2g5b7fao5/r125.pgn/file
Although Predator performed very well in the first 2 matches, I was guessing that Predator would be defeated against DONBFupdate1 in this match. But Predator managed to get through this match.
For other book -book matches:
https://outskirts.altervista.org/forum/viewforum.php?f=29
Example:
Black played here 47...Qc3?
48.Rd2 Kd7 49.d4 exd4 50.Rxd4+ Rd6 51.Rxd6+ cxd6 52.Qa7+ Ke8 53.Nd4 Qc5 54.Qa8+ Kf7 55.Qd8 a5 56.Qd7+ Kg6 57.Qe8+ Kh7 58.Qf7+ Kh8 59.Qf8+ Kh7 60.Qxf4 Qe5 61.Qxe5 dxe5 62.Nxb5 Rh5 63.Nc3 Rh6 64.Ne2 a4 65.Ra1 Rc6 66.Rxa4
White has a decisive advantage: +- (3.46) Depth: 24/46 00:00:03 66037kN, tb=18709
Lose instantly.
The position is a draw, however, the books haven't done anything wrong:
Analysis by Hypnos legacy 020921:
47...a5 48.d4 a4 49.Qa8+ Kd7 50.Nc5+ Ke7 51.Qc8 Qxd4 52.Qxc7+ Ke8 53.Ree1 Qf2 54.Qd7+ Kf8 55.Ne6+ Rxe6 56.Qd8+ Kf7 57.Qxg5 Rh6 58.c4 bxc4 59.Qf5+ Kg8 60.Qc8+ Kg7 61.Qc7+ Kg6 62.Qd6+ Kh7 63.Qd7+ Kh8 64.Qe8+ Kh7 65.Qf7+ Kh8 66.Qf8+ Kh7 67.Qe7+
The position is equal: = (0.00) Depth: 54/40 00:00:05 101MN, tb=42553
and here:
Analysis by Hypnos legacy 020921:
33...Rxh7 34.e4 Kg7 35.Kf3 Rc4 36.e5 Rxc3+ 37.Kg4 Rc4 38.Re1 Rc5 39.d6 Kf7 40.Rd8 Ke6 41.Re2 Rg7+ 42.Kf3 Rc3+ 43.Kg2 Rh7 44.Re8+ Kf7 45.Ra8 Ke6 46.Rf2 Rc4 47.Re8+ Kf7 48.Rd8 Ke6 49.Ra8 Rc5 50.a4 Ra5 51.Re8+ Kf7 52.Rd8 Ke6 53.Re8+
The position is equal: = (0.00) Depth: 36/44 00:00:17 332MN, tb=198877
The position is a draw, but Black played here Rxa2?! and White got an advantage.
In the following position, White can easily make a draw:
Analysis by Hypnos legacy 020921:
21.fxg4 hxg4 22.Rag1 b6 23.Kd1 Qe6 24.b3 Kb7 25.Qg2 Rxh1 26.Rxh1 Rg8 27.Rh5 Bg5 28.Qh2 Qe7 29.Rh7 Qe6
The position is equal: = (0.00) Depth: 36/49 00:00:23 447MN, tb=178
If you want to play safely, then White moves 21. fxg4 and after that the position is pretty much a draw. However, practice with 64 cores has shown that White can take risks very well by playing Nc4!?. In practice, with strong hardware (from 32 cores), White always won. If you only have a few cores, you should better play fxg4 here.
I have both moves in the book. In the event of a defeat, the other move is played.