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Ossip Bernstein vs Alexander Kotov
Groningen (1946), Groningen NED, rd 18, Sep-05
Sicilian Defense: Scheveningen. Classical Variation (B84)  ·  1-0


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Kibitzer's Corner
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Premium Chessgames Member
  agb2002: Usual suspect.
Premium Chessgames Member
  gofer: Hmmm, not a <Friday> puzzle for two reasons;

1) It's a forced mate in 3 (< 50 f5+ exf5/Qxf5 51 Qxh6+ gxh6 52 Rag8#>)

2) Black is about to play <50 ... Qxf4+> which at least levels the playing field, so <50 h4> is too slow and <50 Kg3> simply loses to <50 Rb3+ Kh4 51 Rxh3+! Kxh3 52 Qh1+ Kg3 53 Rb3+>. So, the only other sensible move to look at, that stops <50 ... Qxf4+>, is

<50 f5+>!


Grumble, Grumble, Grumble...

Premium Chessgames Member
  gofer: <paavoh: On the easy side for an end-of-the-week puzzle. With - Rxb2 coming, every White move must be with a check>

If white gambles on <50 ... Rxb2>, then <50 h4> is playable!

<50 h4 Rxb2 51 h5#>

But <50 h4> loses to <50 ... Qxf4+ 51 Qxf4 Rxf4!>

Premium Chessgames Member
  Gilmoy: Shades of Carlsen vs Karjakin, 2016, 50.Qh6+! to defend his WC title :o

click for larger view

Perhaps Carlsen remembers this Bernstein-Kotov game, or has seen something like it? With QRR and some pawns, one deflection sac can open files and ranks for a <two-Rook mate>.

If that wasn't already a training meme, it is now!

Dec-01-17  groog: For a Friday, today was surprisingly easy.
If I hadn't known it was a puzzle, maybe more difficult to spot.
Premium Chessgames Member
  malt: 50.f5+ ef5 51.Q:h6+! gh6 52.Rag8#
(50...Q:f5 51.Q:g6+! gh6 52.Rag8#)

Have seen this one before, still a nice finish !!

Dec-01-17  stacase: Way too easy for a Friday.
Premium Chessgames Member
  morfishine: I saw this game a long, long time ago


Premium Chessgames Member
  gars: Too easy for a Friday, since I solved it in less than five minutes. Kotov, then 33 years old and a tough player, must have been very angry with himself after losing this game to Bernstein, 64!
Premium Chessgames Member
  catlover: I actually remembered this game and the solution. Was it really 12 years ago?
Premium Chessgames Member
  patzer2: For a more difficult puzzle, try visualizing the possibility of the winning mate-in-three after 47. Ra8 Rexb4? (47...Rc4 =) 48. Rcc8 +-.

For even more difficulty, since 47. Ra8 Rc4 = gives Black an easy dead even game, can we find a better 47th move for White?

Yes we can. White can improve with 47. Rd8 ⩲ which wins a pawn after 47. Rd8 Rc4 (not 47...Rexb4? 48. Rcc8 +-) 48. Rxc4 dxc4 49. Rd4 Rc7 50. Qc1 h5 51. Rxc4 ⩲ to = (+0.11 @ 37 ply, Stockfish 8).

The beauty of 47. Rd8 ⩲ is that it not only baits the same trap for Black (i.e. 47. Rd8 Rexb4? 48. Rcc8 +- versus 47. Ra8 Rexb4? 48. Rcc8 +-), but it also gives White the advantage if Black responds with the only saving move 47...Rc4.

Black can probably hold the draw with near perfect play after 47. Rd8 Rc4 48. Rxc4 dxc4 49. Rd4 ⩲. However, unlike 47. Ra8 Rc4 =, 47. Rd8 Rc4 48. Rxc4 dxc4 49. Rd4 ⩲ gives White practical winning chances as it makes the task of securing the draw much harder for Black.

Premium Chessgames Member
  Dionysius1: Very reminiscent of the last moves of the Carlsen Karjakin world chamionships
Premium Chessgames Member
  patzer2: Instead of 33...b4 = (0.00 @ 28 ply, Stockfish 8), Black can significantly improve with 33...Rc7! ⩱ (-0.68 @ 34 ply, Stockfish 8).

The potential back rank mate threat with 33...Rc7 makes the coming 34...b4 ⩱ much stronger than the immediate 33...b4 =. After the Stockfish 8 best play line 33...Rc7 34. Rhd3 b4 35. axb4 axb4 36. h6 (necessary to avoid the back rank mate) 33...bxc3 37. Rxc3 Qd7 ⩱ (-0.68 @ 34 ply), the isolated White pawn on b2 becomes an easy target for Black.

Dec-01-17  JohnDMaster: One star, the path to success is obvious with really one one tree of analysis and one true forcing move!
Premium Chessgames Member
  kevin86: White either win the queen of mates quickly!
Dec-01-17  dfcx: <kevin86: White either win the queen of mates quickly!>

It's always mate in 3.

50.f5+ Qxf5
51.Qxh6+ gxh6

Premium Chessgames Member
  chrisowen: Lame v f5 floods vims flavs overt 50.f5+ boot flanks vats buds mate 2s have lame v f5s flocks again v pets mals lamp vets foyer ford vims queasy bind nibs dink chug wows vims jazz it is vims mine huts it is vims nets u hims keys hems unit ok have vows hues vint mint mien huts vons guvs nite hums vent tine hums menu chit ok aves vows emus thin emus hint hims tune f5 flocks vims vent have lame v f5 flashy la am vams veal it alink have mp maps levs velodrome vespar vets ps task part foots foyer rosy foot vims roys year query a pops aves quibble bind kind dink dark dock chef clang chug hugs huws wu wows vims jazz it is vims mine huts have vows overt 50.f5+ boot flanks vats buds mate 2s have boot vows vets boon boom vims vent bloop ok vons guvs boost keys f5 famine floods flocks flacks flashy favour fiefdom faff around boff coff doff daffy flash hoof bangons 47...Rexb4 gove bands 6 7 aorta conts vows vats vims clangon 47...Rc4 gove codas 1 2 aorta conts vows vats vims back vows bank block kabbalah aorta vims fang ares aves as cans an plan cons gaps have ar famine vons guvs hufflop ok vows cosy hufflog band vows nods vint dink vide wads bassoons ands baby brink ands vims about good mack camp fars vets wrath vats flav do balance drank vats back doot lags catch flav rads afar hang pops a query keys have pins wrack vams cart able brash i vams flav away band mode vows ands co affable flay f5 flocks ha games dastard it ok vons guvs doss drowns vows vims road blight dark rads door vims darn gang dang gland cabs back clock crock vows croft vons guvs cobs choo choo flock flack jack f5 falcon as um ghost jaffa hand clod eves hack have lame v f5 flocks;
Dec-01-17  FlashinthePan: After 47. Ra8, Black apparently didn't see the threat, as he could still escape with 47...f6 (or am I missing something?).
Premium Chessgames Member
  patzer2: <FlashinthePan> After 47. Ra8, Black's only escape is 47...Rc4 =. If 47...f6, then 47. Rcc8 +- and White still wins.
Premium Chessgames Member
  varishnakov: This is the easiest thing I have ever seen in my life. I demand a new puzzle. I am very angry.
Premium Chessgames Member
  JeffH1165: Definitely easy for Friday. Way easier than Wednesday or yesterday.
Premium Chessgames Member
  Bubo bubo: Mate-in-three: 50.f5+! exf5/Qxf5 51.Qxh6+ gxh6 52.Rag8#.

A single three-move line with a ♕-sac: Friday is the new Monday?!

Dec-01-17  Steven87: First Friday I've gotten.
Dec-01-17  WhiteRook48: I saw that thing with f5+ and the queen sac on h6 in about ten seconds. I don't think "difficult" puzzles are supposed to be that easy?
Premium Chessgames Member
  PhilFeeley: Nice queen sac (to be).
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