Trapping the queen

by ChessBase
4/11/2021 – It isn't often one sees a game between top programs in which a queen is trapped in the middlegame, but just such a thing happened in a game shared by Peter Grayson. What stood out was how both programs differed on a key juncture, leading him to comment, "Fat Fritz 2 exhibits almost human-like qualities to threaten the snaring of the queen". Enjoy this fun tussle and his kind analysis. | Photo: National Portrait Gallery, London

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Today's programs are all so strong that they seem to really differ in the details more often than in a decisive statement of strength, and there is no question that when arguing the differences at the stratosphere, it seems almost ludicrous. Engine A is 3568 Elo, while Engine B is inferior because it is only 3565 Elo. So stated by the humans all hovering under 2800 barring a small fistful.

Still, the game made such a powerful impression on Peter Grayson that he declared,

"Considering the fast time control that was quite amazing by Fat Fritz 2 and its subtlety was of a sophistication I would associate more with the human mind than an engine particularly for the follow up that confirmed the engine can execute a long term strategy. Perhaps the Fritz network does provide a more human rather than mechanical, logical approach?"

The game starts quietly, almost innocuously. An English line that has seen proponents on both sides at the highest echelons. 

 
After 9... Re8

Yet by move 12 they had both left most of the known cases behind, with only an Italian correspondence game cited in Mega 2021. The key move that incited so much enthusiasm and which got Black into such a dangerous situation came here:

 
After 19...Qa5?
Can you see White's reply?

"On the face of it this looks to be in line with the idea of controlling an open file where the controlling side tends to have an advantage. The following moves question that idea when it is a wing file and also whether it is advisable for the queen to lead on the rank that will likely be the first piece to come under attack. White's reply may not be immediately obvious until it is seen and few other engines find it, certainly not within the context of the game."

 
After White's lightning strike 20. b6!!

"How important this move was to the outcome of the game should not be understated. With Black seeking to gain control of the open a-file, suddenly the queen looks cut off and potentially a liability. That is the theme of the ensuing moves. Perhaps it deserves !!! What is fascinating is that Fat Fritz 2 exhibits almost human-like qualities to threaten the snaring of the queen."

While Black does manage to avoid the outright loss of the queen, it comes at a heavy price that ultimately costs the game.

 
After 29. Nd1!

White now threatens to win the queen in two moves with 30. ♗b4 ♛a4 31. ♘a4. Black avoids this fate by giving up the exchange, but this in itself proves fatal.


Fat Fritz 2

Fat Fritz 2.0 is the successor to the revolutionary Fat Fritz, which was based on the famous AlphaZero algorithms. This new version takes chess analysis to the next level and is a must for players of all skill levels.


Here is the full game with the generous comments by Peter Grayson.

 
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1.Nf3 Intel(R) Core(TM) i7-8700 CPU î 3.20GHz 3192 MHz W=28.6 plies; 11,508kN/s; 5, 310,785 TBAs B=28.0 plies; 12,681kN/s; 4,073,988 TBAs Nf6 2.g3 g6 3.Bg2 Bg7 4.c4 0-0 5.0-0 d6 6.Nc3 Nc6 7.d3 e5 8.Rb1 a5 9.a3 Re8 10.b4 6 axb4 0 11.axb4 4 h6 6 (Nd4) 12.b5 2 Ne7 2 13.e4 5 (Bb2) Be6 2 (c6) 14.Be3 2 (Qc2) c6 0 (Ng4) 15.Qc1 4 Kh7 4 16.Rd1 14 (Re1) Ng4 3 17.Bd2 2 Nf6 3 18.Qc2 10 (h3) Nd7 2 19.Be3 2 Qa5? 10
(Qc7) On the face of it this looks to be in line with the idea of controlling an open file where the controlling side tends to have an advantage, The following moves question that idea when it is a wing file and also whether it is advisable for the Queen to lead on the rank that will likely be the first piece to come under attack. White's reply may not be immediately obvious until it is seen and few other engines find it, certainly not within the context of the game. 20.b6‼ 8 (h3) How important this move was to the outcome of the game should not be understated. With Black seeking to gain control of the open A-file, suddenly the Queen looks cut off and potentially a liability. That is the theme of the ensuing moves. Perhaps it deserves !!! What is fascinating though is that FF2 exhibits almost human like qualities to threaten the snaring of the Queen. Nc5 3 21.Bd2 3 (Nd2) Qa3 3 22.Rdc1 18 (h3) Ra6 2 (f5) Black continues with its plan to control that A-file but to what purpose? Its 0.00 score is surely wrong? 23.Rb2 1 Rea8 7 24.Rcb1 4 The doubled rooks protect the lock to the Black Queen's exit. Ng8 3 25.Ne1 12 (h3) Now White begins to further snare the Queen. Nf6 18 26.Bc1 12 (Bf1) Qa5 1 27.Bd2 1 The shuffling of the Bishop is strange as though it was to offer the opportunity of a 3-move repetition but .. . Bd7? 2 (Qa3) and that is effectively the end for Black. Returning the Queen to a3 surely left it no worse than it was after move 25? After more time, Stockfish 13 agrees, but then after 3 minutes on eight cores it switches to 27... Nfd7?? which loses the queen quite decisively according to Fat Frtiz 2. A curious blindspot by Stockfish here. 27...Qa3! certainly offers the best chances to survive and even Fat Fritz 2 does not see an immediate win. 27...Nfd7?? would also end in tragedy for Black. 28.Qc1 Qa3 29.Bf1 Na4 30.Nc2 Qc5 31.Be3 Qa5 32.Nxa4 Qxa4 33.Nb4 and it is clear the black queen is going nowhere. 28.Qc1 2 (Ra2) Qa3 5 (Ne6) Now with c2 vacated, White's Ne1 will further reduce the Queen's mobility. 29.Nd1! 2 Ra4 2 30.Bf1 12 Protecting the d3 pawn and enabling Nc2 Ne6 3 Now Black desperately needs to find an escape route for its Queen. 31.Bb4! 2 Rxb4 2 No choice but to give up the exchange! 32.Rxb4 4 Qxc1 3 33.Rxc1 1 Bf8 0 (Nc5) 34.Rb2 1 (Nc3) Nc5 2 35.Nc2 2 Rb8 8 (Be6) 36.Ra1 4 Be6 2 (Be7) 37.Nc3 1 Nfd7 3 38.Na4 1 Nxa4 2 (Be7) 39.Rxa4 2 Be7 5 40.Rb1 5 (Be2) Kg7 2 41.Ra3 0 (Kg2) h5 15 (Nc5) 42.d4 1 exd4 0 43.Nxd4 1 Nc5 2 44.Nxe6+ 2 fxe6 1 45.Bg2 3 g5 1 46.f4 1 g4 1 47.Rba1 2 Bd8 3 (Rf8) 48.Ra8 1 Rxa8 0 49.Rxa8 2 Bxb6 0 50.Kf1 1 Nb3 3 51.Re8 1 Nc5 0 52.Ke2 3 Ba5 0 53.Ke3 2 Bb6 0 54.Kd2 1 Ba5+ 3 55.Ke2 0 (Kc2) Bb6 0 56.f5 2 (Kd1) exf5 1 57.exf5 0 Ba5 0 58.Ke3 1 (Re7+) Bc3 1 59.Be4 1 (Rd8) Kf7 4 (Bb2) 60.Rc8 1 Ke7 0 (Bb2) 61.Bd3 3 (Bb1) Bb2 1 (Kf7) 62.Rg8 1 (Bb1) d5 1 (Nd7) 63.cxd5 0 cxd5 0 64.Rg6 3 (Ke2) Bf6 0 65.Ke2 0 Nb3 0 66.Kf2 1 Nc5 2 67.Ke3 3 (Ke2) Nd7 1 (b6) 68.Ke2 0 Bd4 3 69.Rg5 0 Nf6 0 70.Rg7+ 0 Kd6 1 71.Rxb7 0 Bg1 0 (Nd7) 72.Rf7 2 Bd4 0 73.Bc2 1 Nd7 1 74.Ba4 1 (Bd3) Nc5 1 (Nf6) 75.Bb5 1 (Bc2) Ne4 3 (Bb2) 76.Rd7+ 1 Ke5 0 (Kc5) 77.Bd3 1 Ng5 0 (Nc3+) 78.Rg7 1 Nf3 0 79.Re7+ 1 (Rg6) Kf6 0 80.Re6+ 1 Kf7 2 81.Rd6 1 Nxh2 0 (Bg1) 82.Rxd5 1 Bf6 2 (Bb2) 83.Be4 1 h4 1 84.gxh4 1 (Rd7+) g3 1 85.Rd6 3 (Rd7+) Ng4 0 86.h5 1 (Ra6) Be5 2 (Ba1) 87.Bd5+ 0 (Rg6) Kf8 0 88.Rg6 1 Nf6 1 89.Bf3 1 Ke7 2 (Kf7) 90.h6 1 Kd7 1 (Kf7) 91.Rg7+ 1 (Kf1) Kd8 1 (Kd6) 92.h7 1 Ne8 2 (Nxh7) 93.Rg6 1 Bh8 0 (g2) 94.Rg8 1 Bc3 0 (g2) 95.h8Q 2 Bxh8 0 96.Rxh8 1 Ke7 1 97.Rxe8+ 1 Kxe8 0 98.Ke3 0 Ke7 0 99.Kf4 0 Kd6 0 100.Kg5 0 Ke5 0 101.f6 0 Kd6 0 102.Kg6 0 Ke6 0 103.f7 0 g2 0 104.Bxg2 0 Ke5 0 105.f8Q 0 Kd4 0 106.Kf5 0 Kd3 0 107.Qb4 0 Ke2 0 108.Qd4 0 Ke1 0 109.Qb2 0 Kd1 0 110.Bf1 0 Ke1 0 111.Qe2# 0
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WhiteEloWBlackEloBResYearECOEventRnd
Fat Fritz 2 CB-Stockfish 13-1–02021A2683.3

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