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Anna Hahn vs Aaron Pixton
US Championship 2003 (2003), Seattle, WA USA, rd 2, Jan-10
Dutch Defense: Semi-Leningrad Variation (A81)  ·  0-1

ANALYSIS [x]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 4 OF 4 ·  Later Kibitzing>
Jul-15-19  TheaN: Pretty sure this has been featured a few times: Black secures f3 with a diagonally hitting piece and mate can't be prevented.
Jul-15-19  zb2cr: 26. ... Bf3, threatens mate in one. After White plays 27. exf3, exf3renews the threat with nothing White can do about it.
Jul-15-19  Damenlaeuferbauer: As an excellent mathematician, my old friend Aaron easily calculated 26.-,Bf3! 27.exf3,exf3 with Qg2# on the next move! Sometimes I guess, he could have achieved more in chess!
Jul-15-19  patzer2: Hooray! Easy Monday is back with 26...Bf3! quickly forcing mate.

P.S.: So where did White go wrong? According to Stockfish 10, the losing move was 23. Bxe4? fxe4 -+ (-4.39 @ 28 ply).

Instead, 23. h5 ⩱ to = (-0.47 @ 25 ply) gives White drawing chances:

<[Stockfish 10 64] 25:-0.47} 23.h5 Bh7 24.Qb2 f4 25.g4 b6 26.Bxe4 Bxe4 27.f3 bxc5 28.bxc5 Rab8 29.Qc3 Bh7 30.Bb2 Kg7 31.a4 a5 32.Ba3 Rb7 33.Ra2 Rfb8 34.Rb2 Rxb2 35.Bxb2 (0.00 @ 42 ply)>

Jul-15-19
Premium Chessgames Member
  whiteshark: <26...Bf3!!>, and that's it!
Jul-15-19  Chesgambit: very easy Bf3!
Jul-15-19
Premium Chessgames Member
  Breunor: Glad to see Monday puzzles going back to easy after missing a few!

Computer views that 23 Bxe4 was white's big mistake:

1) -2.65 (21 ply) 23...fxe4 24.Bb2 e3 25.Qc3 Qh3 26.e6 Rf6 27.h5 Be4 28.f3 Raf8 29.g4 Qg3+ 30.Kh1 Qxg4 31.Qe5 Qh3+ 32.Kg1 g4 33.Qh2 Qxh2+ 34.Kxh2 Rf5 35.Bd4 Rxh5+ 36.Kg3 gxf3 37.Bxe3 fxe2 38.Rxf8+ Kxf8 39.Rg1 Rf5 40.Bxh6+ Ke8

Instead white should play h5:

1) -0.33 (24 ply) 23.h5 Bf7 24.Bb2 g4 25.Bxe4 fxe4 26.Qd2 Bxh5 27.Kg2 Rf5 28.Rh1 Raf8 29.Raf1 Kh7 30.Bd4 Bf7 31.Be3 h5 32.Bf4 Rd8 33.Qd4 Qg6 34.Rd1 Be6 35.Qe3 Rff8 36.a4

The lines look very similar - it seems like the key difference is that in the line with 23 h5, black plays g4; although he wins the h pawn, he loses the ability to move the bishop to f3 or exploit the weak d1-h5 diagonal.

Oct-21-19  zb2cr: I remember this one-- 27. ... Bf3 threatens mate on g2 or h1, leaving White no choice but to play 28. exf3, after which Black renews the threat with 28. ... exf3. White can't counter the threat of mate on g2.
Oct-21-19
Premium Chessgames Member
  Sargon: Puzzle for 2019-10-21:

Sznapik vs D Komljenovic, 1987

Oct-21-19  Everett: Whites 23rd is one of the worst exchanges Iíve seen played by a good player.
Jan-20-20  lost in space: amnesia test
Jan-20-20  Cheapo by the Dozen: A little different than the usual (and I didn't recall it from before). Occupy f3. Occupy it again. :)
Jan-20-20
Premium Chessgames Member
  agb2002: Level 1. 56. ?
Steinitz vs Blackburne, 1862


click for larger view

Jan-20-20  jith1207: Good one, <agb'02>: made me think more.
Jan-20-20  zb2cr: Okay, "If at first you don't succeed, try, try again" should be the motto for this puzzle.

26. ... Bf3 threatens mate at both g2 and h1, leaving White no choice.

27. exf3

But now Black recalls the above saying and plays 27. ...exf3, threatening ... Qg2#.

Jan-20-20  SpamIAm: 18.h4 strikes me as a positional mistake here. Usually white aims for an eventual e4 in this kind of position, thus IMO 18.f3 was better.
Jan-20-20  TheaN: This game seems to be stuck somewhere in the puzzle void of CG. Trying to take the spot of the Monday puzzle, occasionally succeeding. We still go to f3, and we still do it twice :>.
Jan-20-20  Damenlaeuferbauer: Same procedure as on July 15, 2019! Seven month and five days ago I wrote: "As an excellent mathematician, my old friend Aaron easily calculated 26.-,Bf3! 27.exf3,exf3 with Qg2# on the next move! Sometimes I guess, he could have achieved more in chess!" I have nothing to add.
Jan-20-20
Premium Chessgames Member
  Jimfromprovidence: Here is another Monday level puzzle. (Thanks <agb2002> for yours).

It's move 39, BLACK to play and win.


click for larger view

Here is the game link.
J Becerra Rivero vs Y Shulman, 2008

Jan-20-20
Premium Chessgames Member
  chrisowen: Backwards no?
Jan-20-20
Premium Chessgames Member
  chrisowen: h3...
Jan-20-20
Premium Chessgames Member
  gawain: This was easy, once I accepted that the Black rook plays no part in the winning combination.
Jan-20-20
Premium Chessgames Member
  PawnSac: < Jimfromprovidence: Here is another Monday level puzzle. It's move 39, BLACK to play and win. >

yep, cute. ..R8h3 its a mate in 3

Jan-20-20  RandomVisitor: <PawnSac>Try the other rook... :)
Jan-20-20  morfishine: Ye Olde squeeze play
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