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Salomon Flohr vs Efim Bogoljubov
Prague Olympiad (1931), Prague CSR, rd 9, Jul-17
King's Indian Defense: Fianchetto Variation. Classical Fianchetto (E67)  ·  0-1



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Kibitzer's Corner
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Jul-17-17  lost in space: Took me longer than usual on my beloved Monday.

40...Rg3 41. fxg3 (else 41...Rxh3 mate can not prohibited) 41... Nxg3 mate

Jul-17-17  awfulhangover: Took a long time to find. Since this is Monday, Komodo/Stockfish/Houdini/Fritz will be the only who solve Sunday.
Jul-17-17  MrCarciofo: Placing a piece and no crashing - it's always harder for me to find this kind of moves. But when I manage to I always feel myself as a better player.
Jul-17-17  King Harvest: What the hell kind of Monday was this!? I solved, eventually, but only because I sat there saying, "I am not giving up on a monday..."
Jul-17-17  Pasker: I got this one fairly quickly. From the first look I knew this must be a mate in 2 puzzle for sure and I was sure its the knight is going the deliver mate (typical in these kind positions). After tossing out some candidate sacs, I quickly noticed rg3 which forces mate. Wow nice one!
Premium Chessgames Member
  kevin86: Missed a layup on Monday. Black threatens mate, if the rook is taken, the knight mates.
Jul-17-17  dTal: In common with many, I found this challenging. Took me over 3 mts, and I'm pretty sure I only found it because I knew there must be a killing move. Doubt I would have seen it as a concluding move in a combination :-(
Jul-17-17  Halldor: I'm glad to see that I wasn't the only one who found this rather difficult.
Jul-17-17  Iwer Sonsch: 40...Kh5 and 40...c5 force mate in 12 respectively 13 moves. 40...c6 and 40...R8g6 are still clearly winning, as White is forced to play 41.Rc3 to avoid mate.
Premium Chessgames Member
  Peligroso Patzer: A puzzle whose solution starts with a quiet move?!?

I dunno, some may disagree, but by my lights that seems unfairly tricky for a Monday.

Premium Chessgames Member
  whiteshark: No crumbs on the Flohr, please!
Jul-17-17  RandomVisitor: After 28...Nf7 white is looking strong

click for larger view

Stockfish_17061704_x64_modern: <14 minutes computer time>

<+1.30/40 29.Qh4 Qh6 30.Qg3 Qg7 31.Rc4> Bh5 32.Rdc1 Be2 33.R4c3 Nh8 34.Qxg7+ Kxg7 35.cxd6 cxd6 36.Rc7+ Rf7 37.Bd4+ Kh6 38.Rxf7 Nxf7 39.Rc2 Bh5 40.Kh2 b5 41.Bf1 Ra8 42.Rc7 Kg6 43.Re7 Kh6 44.f3 exf3 45.Kg3 a5 46.a3 axb4 47.axb4 Ra3 48.Re3 Rxe3 49.Bxe3 Nd8 50.Bxb5 Bf7 51.Bc4

Jul-17-17  ColeTrane: No brakes all gas
Premium Chessgames Member
  ajk68: <ajk68: 37. Bxf3 may not have lost the game, but feels like a positional mistake to me.>

Running this through a computer I see it drastically changes the evaluation and does indeed lose the game.

Jul-17-17  JeffH1165: Yeah this one took a couple of minutes to solve. "Monday, Monday can't trust that day . . . "
Premium Chessgames Member
  swclark25: Got it...finally. I agree with the tricky Monday kibitzes.
Premium Chessgames Member
  steinitzfan: It's short enough to be a Monday puzzle. That's about all. Wisht I could see it over the board.
Jul-17-17  RandomVisitor: A final look after 28...Nf7: white is almost winning

click for larger view

Stockfish_17061704_x64_modern: <3 hours computer time>

<+1.49/47 29.Qh4 Qh6 30.Qg3 Qg7 31.R4d2> Bh5 32.Rb1 Re7 33.a4 Qg6 34.a5 Nh8 35.b5 axb5 36.Kh2 Qxg3+ 37.fxg3 Be8 38.Rc2 Nf7 39.c6 bxc6 40.dxc6 Nd8 41.a6 Bxc6 42.g4 Ba8 43.Rxb5 c5 44.Rd2 Nf7 45.Bf1 Ra7 46.Rb6 Rd8 47.Bxc5 dxc5 48.Rxd8+ Nxd8 49.Rb8 Kf8 50.Rxd8+ Ke7 51.Rc8 Bd5 52.Rxc5 Kd6 53.Rc8 Kd7 54.Rb8 Kd6 55.Kg3 Kc5 56.gxf5 Rf7 57.Re8 Kd4 58.Re5

Jul-17-17  docbenway: I will often solve the Monday puzzle while putting my glasses on but this took a couple of minutes of trial and error and I finally glommed onto that rook move out of desperation and it fell into place.
Premium Chessgames Member
  OhioChessFan: I don't feel bad. Flohr missed it too.
Jul-18-17  Razgriz: I was looking at

28. ... Rh2+
29. Kxh2 Rg2+
30. Kh1 Ng3#

Jul-18-17  Tiggler: What prevented me from solving this immediately was the thought: "This is a Monday puzzle." After putting that aside, the solution is not so hard to find.
Premium Chessgames Member
  perfidious: White's king is allowed to choose between methods of being put to the sword.
Jul-19-17  ChessHigherCat: How ironic, we all thought that this was a rare and complex mate for a Monday puzzle, and here we find a game with the very same mating pattern only a few days later :-)
Premium Chessgames Member
  gawain: This one did feel difficult. Had to look away for a little while--a couple of minutes. Second time around the solution came quickly.
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