David Anton Guijarro vs Aryan Tari (2021)

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David Anton Guijarro vs Aryan Tari
Tata Steel Masters (2021), Wijk aan Zee NED, rd 5, Jan-21
Spanish Game: Berlin Defense. l'Hermet Variation Berlin Wall Defense (C67) · 1/2-1/2

ANALYSIS [x]

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Jan-22-21		Check It Out: 54...? Is a good Tuesday-ish puzzle.

Jan-22-21		Ned Merrill: It took the computers to figure out that 54...Bb5!! shuts the White king out in a super zugzwang, allowing Black to pick up all the White pawns

Jan-22-21		AylerKupp: <<Check It Out> Guijarro just missed a winning shot against Tari ... Can you see the winning shot?> (from Tata Steel (2021)) You're right, and that's the only way to win according to the FinalGen tablebase generator. It calculates <every> possible combination of moves. And because it's a relatively simple position, with mostly pawns, it took a reasonable amount of time (for a change!), less than 45 minutes. Here was its assessment of the position after 54.e3 click for larger view 54...Bb5 Black wins in 12 54...Kg8 Draw 54...Kf8 Draw 54...Kg7 Draw 54...Bc2 Draw 54...Bc3 Draw 54...Bd7 Draw 54...c2 Draw 54...Bc6 White wins in 21 54...Bd1 White wins in 18 54...Ke8 White wins in 17 54...Ke7 White wins in 17 54...Be8 White wins in 16 Where "wins" indicates that the player reaches a very likely winning position such as after promotion of a pawn to a queen (and keeping the queen!). So I thought it was interesting not only for FinalGen to find Black's only way to win but to find 5 other not altogether unreasonable moves that would lead to a White win! I also thought it would be interesting to see FinalGen's assessment of the final position, particularly since FinalGen keeps the results of all its calculations in effectively a gigantic hash table so small modifications of the previously analyzed positions are available almost instantaneously. Here was its assessment of the final position after 60.Kb2: click for larger view 60...Kg8 Draw 60...Bb3 Draw 60...c1N White wins in 15 60...c1B+ White wins in 15 60...c1R White wins in 15 60...c1Q+ White wins in 15 60...Be8 White wins in 14 60...Bd7 White wins in 14 60...Bc6 White wins in 14 60...Bb5 White wins in 14 60...Kf8 White wins in 12 60...Kh8 White wins in 10 60...Kh7 White wins in 10 60...Kf7 White wins in 9 Black's king cannot move other than to g8 without losing!

Jan-22-21		Olavi: <Ned Merrill: It took the computers to figure out that 54...Bb5!! shuts the White king out in a super zugzwang, allowing Black to pick up all the White pawns> Not really. The relevant findings were published by Jozsef Szen in Bell's Life in 1840.

Jan-22-21		Check It Out: <Olavi> Is there a way to read that article by Szen? I found this, the Szen position, black to move, draw: click for larger view Not that I understand the implications.

Jan-22-21		Check It Out: <AylerKupp> In the final position, click for larger view I would have no idea that the king has to retreat to g8 to keep the draw. Any other king move loses, but I'm not sure why.

Jan-22-21		Olavi: Yes, the R+B vs R is the more famous Szen position. A peculiar hobby was to analyze Kd1 pa2 b2 c2 - Ke8 pf7 g7 h7, which Greco written about in 1623 (with various positions for the kings). Reprints must be available online... The database https://pdb.dieschwalbe.de/search.jsp gives (with wKe1) Lösung aus 'Szachista 1933': 1. ... Kd7 2. a4 h5 3. Kf2 h4 4. Kg2 Kc6 5. Kh3 g5 6. a5 Kb5 7. b4 f5 8. c4+ Ka6 9. c5 Kb5 10. Kg2 f4 11. Kh2 g4 12. Kg1! f3,g3,h3 13. Kf2,Kg2,Kh2

Jan-23-21		cro777: The geometry of the chess board. The way the space in chess is fragmented gives it some special properties. <Check It Out: <AylerKupp> In the final position, I would have no idea that the king has to retreat to g8 to keep the draw. Any other king move loses, but I'm not sure why.> click for larger view Black to move must be able to meet both White's threats: 61.h6 with 61...Kh7 and 61.f6 with 61...Kf7 This is possible only if the black king is placed on g7 or g8 (reflection symmetry): click for larger view Therefore, in the game, Black must either leave the king on g7 (and play 60...Bb3) or move the king to g8 (by playing 60...Kg8). Any other move loses.

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