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Salomon Flohr vs Efim Bogoljubov
Prague ol (Men) (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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  whiteshark: [Final Move] Monday Puzzle
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  Phony Benoni: Close quarters on White's king, so surely there are mating possibilities. Try the two knight checks ... no. The rook checks ... no. Quiet rook move that's not so quiet? Ah!

40. .Rg3 41.fxg3 Nxg3#.

White can string it out with a few useless rook checks.

Jul-17-17  Cheapo by the Dozen: This was Tuesday-hard for me.
Jul-17-17  newzild: Tough for a Monday!

This took me 30 seconds.

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  al wazir: This took me a *long* time. It was not a Monday-level puzzle.
Jul-17-17  drollere: the black f3 pawn is the key.
Jul-17-17  zb2cr: 40. ... R8g3 threatening mate by ... Rh3. If White plays 41. fxg3, Nxg3#. Otherwise, as <Phony Benoni> said, all White has is meaningless spite checks with his Rooks.
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  ChessHigherCat: Efim cracks the Flohr

Well, this is Monday and there's no queen to sac so it must a rook sac, and the only one that works is on g3. I agree it was more like a Tuesday, but maybe the rest of the week will be "complexified" accordingly.

Jul-17-17  goldfarbdj: Definitely on the hard side for a Monday.
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  agb2002: Black has a knight for a bishop.

White threatens Rxc7.

The pawn on f2 prevents Ng3#. Therefore, 40... R8g3 and mate once White runs out spite checks.

Jul-17-17  AlicesKnight: 40.... R8g3. If the P captures g3, Nxg3 is mate. If not, ....Rxh3 is mate. When he was good, Efim was very good.
Jul-17-17  nasher: Three things make this a difficult puzzle: (1) the g2 rook has three possible moves to consider and the knight has two possible moves to consider, (2) the answer is a quiet move, and (3) it is a Monday so I automatically look for something simple. This took me at least five minutes to solve.
Jul-17-17  saturn2: 40..Rg3 found.
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  ajk68: If this were not presented as a puzzle, I don't think I would have ever seen this.

37. Bxf3 may not have lost the game, but feels like a positional mistake to me. Yes it weakens blacks pawn structure, however, white doesn't have minor pieces to attack those weak pawns. The move just created spaces for black's knight to hop around.

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  patzer2: Took me a few minutes to find 40...R8g3 and solve today's Monday puzzle, because I was trying to calculate the variations following every check and capture first.

White's decisive mistake was 37. Bxf3? allowing 37...exf3 , which creates a decisive hole on e4 for the Black Knight.

Instead, White should play 37. Rdc2 = to with a defensible position.

Earlier, White can improve over 32. cxd6? which allows 32...Nxd6 and surrenders the advantage to Black.

Instead, 32. Rdc4 maintains the tension in the position with a clear White advantage.

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  yadasampati: You do not expect such a quiet move on a Monday. This is how an easy problem becomes more difficult :-)
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  cocker: Played on this day in 1931, but too subtle for me.
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  morfishine: White is floored
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  jith1207: Good puzzle. Last week's puzzles looked suitable for a day earlier than that was given, and this week it may turn out to be given a day in advance than it should have been.
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  Richard Taylor: I thought: "This is easy, it's obviously Ng3+".

Well, it looked winning...

Oh well, cant win them all. Trouble is I don't seem to be winning anything.

Such is chess and life. Nice move by Boggle.

Jul-17-17  Iwer Sonsch: 40...Rg3. If 41.fxg3 Nxg3#. Took me a while. White can try to sac for some checks.
Premium Chessgames Member
  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..."
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