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Salomon Flohr vs Imre Koenig
Rogaska Slatina (1929), Rogaska Slatina YUG, rd 5, Sep-??
Indian Game: Saemisch-Indian (A50)  ·  1-0



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Kibitzer's Corner
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Premium Chessgames Member
  agb2002: <Steve.Patzer: Stockfish needs some refreshers, it chose Qxc5 for mate in 16. Then when you move Bxe5 it figures out mate in 8.>

I've also noticed this with the Droidfish version.

Premium Chessgames Member
  murkia: The cg engine chooses 40.Qxc5.
Jan-01-20  Cheapo by the Dozen: I didn't actually see 41 Rc7, which fits with not seeing the defensive response to 41 d7 of 41 ... Re7. Fortunately, White wins handily in that line as well.
Jan-01-20  mel gibson: I saw the first move in only 5 seconds.

Stockfish 10 says mate in 9:

40. Bxe5

(40. Bxe5 (♗g3xe5 ♖e6xe5 ♖f7-c7 ♕d8xc7 ♕c6xc7+ ♔b8-a8 ♕c7xc8+ ♔a8-a7 ♕c8-c7+ ♔a7-a8 d6-d7 ♖e5-e1+ ♘c2xe1 ♘g8-e7 d7-d8♕+ ♘e7-c8 ♕d8xc8+) +M9/66 41)

Jan-01-20  AlicesKnight: Got it. In addition 40.Rc7 Rxd6; 41.Rxc8+ wins a piece but is slower.
Jan-01-20  Walter Glattke: 41.-Ne7 42.Qb6+ Ka8 43.Qa7# The rook also takes the square b6 for the black queen.
Jan-01-20  Eduardo Leon: After thinking for a while, I found 40.♖c7. The threat of 41.♕b6+ is so strong that black is forced to play 40...♖xd6 41.♖xc8+ ♕xc8 42.♕xd6+. Not only is white a piece up. Also, the black king's position is precarious, and he cannot bring his knight into the game. White will need a few tempi to bring his own knight into the attack, but once he does, the game will be over.

Nevertheless, Flohr's 40.♗xe5 ♖xe5 41.♖c7 is better, since 41...♖xd6 is no longer possible. Hence white wins on the spot.

Jan-01-20  saturn2: I only looked at 40.Rc7 

40...Re8 41. d7 winning a piece

40...Ne7 41. Qb6+ mate next

40...Rxd6 41. Rxc8+ Ka7 42. Qa8+ Kb6 43. Rxd8 winning Q+B

Premium Chessgames Member
  Knighthawkmiller: 20... fxe4 opens the game against black. 20... f4 gives black better chances for a king side attack. Flohr swept Koenig in this game.
Jan-01-20  RandomVisitor: 12.Nf5! is a nice improvement which keeps the attack going... but difficult to resolve is 12...g6 13.Ng7+ Kf8 14.Bh6 Kg8 which creates a jumble of trapped pieces

click for larger view


<54/95 2:06:18 +2.76 12...0-0 13.f4> Kh8 14.c5 Bxd3 15.Qxd3 exd4 16.Bxd4 f6 17.cxd6 g6 18.dxc7 Qxc7 19.Ne3 Nc6 20.e5 Rad8 21.Nd5 Ndxe5 22.Nxc7 Nxd3 23.Ne6 Nxd4 24.cxd4 Rfe8 25.Nxd8 Rxd8 26.Rf3 Nb4 27.Rc1 Nd5 28.Rff1 Kg7 29.g3 Rd7 30.Kf2 Kf7 31.a4 h5 32.Rc8 Ne7 33.Rc4 h4 34.Rfc1 hxg3+ 35.hxg3 Nd5 36.Re1 f5 37.Rec1 g5 38.fxg5 Kg6 39.Rc8 Kxg5 40.Rg8+ Kf6 41.Rc6+ Kf7 42.Rcc8 Ne7 43.Rgd8 Rxd8 44.Rxd8 Ke6 45.Re8 Kf7 46.Ra8 Nc6 47.Ke3 Ke6

Jan-01-20  RandomVisitor: <Knighthawkmiller>20...fxe4 21.Bb3? Nxd5 is good for black, white should have played the simple 21.Nxe4

After 20...fxe4 21.Bb3? Nxd5!

click for larger view


<43/71 05:03 -0.52 22.Nxe4 Nf4> 23.Bxf4 exf4 24.Qg4+ Kb8 25.Qxf4+ Qc7 26.Raf1 Qxf4 27.Rxf4 Bxc4 28.Bxc4 Nxc4 29.Nxc5 Ne3 30.Nd7+ Kc8 31.Nf6 Nxf1 32.Nxe8 Rxe8 33.Kxf1 Re7 34.h4 Kb7 35.Kf2 a5 36.h5 gxh5 37.Rf5 h4 38.Rf4 Re5 39.Rxh4 h5 40.c4 Kc6 41.Rh3 Kc5 42.Rb3 Re4 43.Rb5+ Kc6 44.Rxh5 Rf4+ 45.Ke3 Rxc4 46.g3 b5 47.Kd3 a4 48.Rh4 Rc1 49.g4 Ra1 50.Kc3 Rxa2 51.Kb4 Rg2 52.Rh6+ Kd5 53.Kxb5

Premium Chessgames Member
  gawain: I, too, saw only 40 Rc7. It did not feel like a very good solution but apparently it would have worked. I wish I'd seen Flohr's move, though.
Premium Chessgames Member
  patzer2: Apparently there's more than one way to solve our Wednesday, New Year's Day 2020 puzzle.

My two candidate moves were 40. Qxc5 +- which forces mate in 15 according to our Stockfish 9 analysis of move 40...? and 40. Rc7 +- (+8.51 @ 21 ply, Stockifish 9 analysis of move 40...?).

I picked 40. Rc7 +- after seeing it wins a piece. I didn't look at the better alternative 40. Bxe5 Rxe5 41. Rc7 +- which forces mate-in-seven according to Stockfish 9 analysis of move 40...?.

P.S.: Black's decisive mistake was apparently 22...Qd7?, allowing the attacking, positional combination 23. Bh6! Rf7 24. Ne3 Ng8 25. Rxf7 Qxf7 26. Bg5 +- (+3.25 @ 37 ply, Stockfish 10).

Instead, 22...Nh5 = (0.00 @ 37 ply, Stockfish 10) or 22...Qg7 = (0.00 @ 38 ply) appear to keep the position level.

Earlier, after 21. Bb3? <Random Visitor> correctly observes that the simple 21...Nxd5 ⩱ ( winning a pawn by exploited the pin on c4) would have given Black the advantage.

Jan-01-20  TheaN: Hah! This is the typical <if you see a good move look for a better one> but with a twist. I initially looked at 40.Bxe5 and did not spot 41.Rc7; after pondering for a minute or so more I spotted <40.>Rc7 and decided to go with it, not realizing combining both ideas works perfectly for White.

Of course, White's won without issue after 40.Rc7 Rxd6 (nothing else against Qb6 with #) 41.Rxc8+ Qxc8 (Ka7 42.Rc7+ +-) 42.Qxd6+ +- and either the critical Pe5 or the knight will fall. However, after <40.Bxe5>, which creates d7+ also, Black falls to Rc7 completely after 40....Rxe5 41.Rc7 #7, abolishing the Rxd6 defense altogether. Instructive New Years puzzle.

Premium Chessgames Member
  chrisowen: Flickers up turn me on.
Jan-01-20  RKnight: After working hard to make 40. Rc7 work, I too was "Flohred" by the quicker 40. Bxe5.
Jan-01-20  RandomVisitor: Koenig chooses an unusual opening (2...b6) where best play seems to give white an advantage... after 3.f3

click for larger view


<50/76 3:05:09 +0.51 3...e6 4.e4 Be7> 5.e5 Ng8 6.f4 Bb7 7.Nf3 Bb4+ 8.Nc3 d5 9.cxd5 Qxd5 10.Bd3 Nc6 11.0-0 Qd7 12.a3 Bxc3 13.bxc3 h6 14.Qe2 Nge7 15.Rb1 0-0-0 16.Re1 Na5 17.Bb5 Bc6 18.a4 Qd5 19.Qc2 Bxb5 20.axb5 c5 21.Be3 c4 22.Nd2 Kb8 23.Bf2 Rd7 24.Ne4 h5 25.Ng5 h4 26.Be3 Nf5 27.Rb4 Rc7 28.Ne4 Nxe3 29.Rxe3 Rd8 30.Qa4 Rcc8

Jan-01-20  SpamIAm: <Random Visitor>, <patzer2>, if black plays 21...Nxd5? white has the zwischenzug 22.Qg4+! winning a piece.
Premium Chessgames Member
  patzer2: <SpamIAm> After 21...Nxd5 22. Qg4+ Kb8 23. cxd5 e3 ∓ to -+ (-2.00 @ 21 ply, Stockfish 9 analysis of move 24.?) Black wins the piece back with near decisive advantage.
Jan-01-20  ndg2: I failed with 40.Rf1, which is also decisive because of threats against knight and rook since black has to prevent mate. But it isn't mate like in the game.
Jan-01-20  SpamIAm: <patzer2>- Whoops! (hap tip)
Jan-01-20  SpamIAm: I meant hat tip.
Jan-01-20  King.Arthur.Brazil: I found both: 40.♗xe5 is the way to win, since it threats 41. d7+ ♔a7 42. dxc8=♘#. Therefore, the Black must deviate the ♖ from d6 where it could capture the p (40...♖xd6 is impossible, due to {41. Bxd6+). Then. 41.♖c7 allows the next 42.♕b6+ and check-mate next.
Jan-01-20  laskereshevsky: As many others i see 40. ♖c7 wich win one piece... checking the game the 40. ♗xe5 came as a surprise...
Jan-01-20  pdxjjb: On my late-model Mac, Stockfish took 20 seconds to give up on Qxc5 and get the right answer. To me that says something about how surprising the correct answer is.
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