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Julio Molina vs Aaron Schwartzman
Mar del Plata (1934), Mar del Plata ARG, rd 5, Mar-??
Sicilian Defense: Closed. Fianchetto Variation (B24)  ·  0-1
ANALYSIS [x]

FEN COPIED

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sac: 26...Rxe4 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
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Oct-31-08  eaglewing: <zb2cr> Regarding 26. ... Rxe4 27. dxe4 Rxe4 28. Qf2 Be5+ 29. Kh3 Qe6+ 30. Qf5: Try now Re2 instead of Re3.

Oct-31-08  Nostrils: Was also expecting 28 Qf2, but I thought 28 ... Bd4 more interesting than Be5+.
Oct-31-08  garrido: hello, good morning friend
rxe4 is elemental, threats bishop e5
black best game
Oct-31-08  zb2cr: Hi <MostlyAverageJoe>,

Thanks for running the problem through Hiarcs. As I stated, I only ran a fast check with Crafty, letting the engine run for only a few seconds--in both cases, not long enough to reach the forced mate lines which your engine found. OTOH, IIRC, you have a powerful 8-core machine running Hiarcs as opposed to my dual-core.

To <eaglewing>,

Thanks for the suggested improvement. I'm strictly an average player, and my initial post for these problems is always done in "simulated game" mode, meaning no help from an analysis engine and no moving of the the pieces. My board vision gets kind of shaky out past 4 full moves, so it's not surprising I missed the more forcing mate in 1 threat you give.

Oct-31-08  zb2cr: To <SufferingBruin>,

It's good to have brothers.

Oct-31-08  goodevans: Didn't like this puzzle much. Looked briefly at 26 ... Rxg5 but decided quite quickly that 26 ... Rxe4 27 dxe4 Rxe4 "must" be the solution.

Black has what looks like an overwhelming attack but there are too many lines to consider for my liking (28 Qb8+, 28 Qf3, 28 Qf2, ...). Maybe I'm just lazy!

Oct-31-08  Patriot: At first the position looked very strong for white, with Nf6+ Bxf6 gxf6 and Qg3+ threatened. But it is black's move, so the obvious try is to take the threatening knight.

26...Rxe4 27.dxe4 (here I wanted to pin and win the white queen with 27...Be5 but black loses after 28.exd5 Bxf4+ 29.Rxf4)

27...Rxe4 (seems to be the only try to maintain the initiative)

Now you must consider 28.Qb8+ Bf8 and white must deal with Rxh4+ or Re2+ with a strong attack. That's when I settled for 26...Rxe4.

Oct-31-08
Premium Chessgames Member
  johnlspouge: Friday (Difficult):

J Molina vs A Schwartzman, 1934 (26?)

Black to play and win.

Material: B for N. The White Kh2 is open, with the White Qf4 on the same dark diagonal and potentially vulnerable to a pin by Bg7 on e5. Black has a battery Re8 and Re5 blocked by Ne4, suggesting a clearance sacrifice to move Re5 with tempo.

Candidates (26): Rxe4

26...Rxe4 27.dxe4 [else, drop material]

27...Rxe4 (threatening 28Rxf4 and 28...Be5)

28.Qb8+ Bf8

(threatening 29Re2+ 30Qg2+ then mate, 29Rxh4+, and Bd6)

All K moves lead to losses. With omission of obviously infeasible or confluent variations:

(1) 29.Kh3 Re3+ 30.Kh2 Re2+ then mate

(2) 29.Kg3 Re3+ 30.Kf2 Qf3+ 31.Kg1 Qg4+ 32.Kh1 Qg2#

(3) 29.Kg2 Re2++ and mate soon

(4) 29.Kg1 Rg4+ 30.Kf2 Rg2+ 31.Ke3 Qd4+ 32.Kf3 Qg4+ 33.Ke3 Re2+ 34.Kd3 Qe4+ 35.Kc3 Qc4#

Obviously, one could continue, but with the Qc8 unable to return because of the threat Bd3, the anchor points provided by Pc5 and Ph5 are enough to bring the heavy piece attack home against Kh2 and Rf1.

I did not follow the game variation, but clearly the attack comes home on the 2nd R sacrifice. In Q+R attacks, if I sample a few good defensive variations and see the defense fail, I rarely calculate further. Attacks based either on Q+R or on a heavy piece making the K walk a tightrope on the 3rd rank are refractory to exact calculation. Exact calculation is sometimes required, however: Karpov vs Korchnoi, 1978

Oct-31-08
Premium Chessgames Member
  chrisowen: Shining example of jacking the e-file, even 26.Ne4 doesn't stop the black rook from breaking in. It transpires that 26.Rxe4 wins and Schwartzman crows his victory.
Oct-31-08
Premium Chessgames Member
  YouRang: Well, I at least noticed the main idea of a clearance sac to vacate e5 for a queen-winning bishop pin. Of course, it's not that easy since 26...Rxe5 27.dxe5 leaves my queen under attack.

I can take my queen out of attack (and get a pawn) with 27...Rxe5. I've traded R for N+P, and now the white queen really needs to get off the b8-h2 diagonal due to the bishop threat, except that he can try 28.Qb8+ Bf8, but that rather leaves white's badly exposed king at the mercy of our Q+R, and Q+R attacks aren't known for being merciful.

Anyway, my head started swimming through the variations. Fortunately, I had a sudden attack of laziness and decided that black had a pretty good king attack going and that this was good enough. :-\

Oct-31-08  Patriot: <johnlspouge: "In Q+R attacks, if I sample a few good defensive variations and see the defense fail, I rarely calculate further. Attacks based either on Q+R or on a heavy piece making the K walk a tightrope on the 3rd rank are refractory to exact calculation. Exact calculation is sometimes required..."

Well stated. Whenever each defense fails and unless your opponent has counterplay, you don't have to figure everything out because during a game all you have to do is find the best move. It doesn't matter if the move leads to mate or leads to an even greater win of material at some point in the analysis. You just have to be careful and not make quiescence errors.

Oct-31-08
Premium Chessgames Member
  DarthStapler: I didn't get it
Oct-31-08
Premium Chessgames Member
  kevin86: Black gives up both rooks...and follows with a quick win.

Too bad,I couldn't get past the first part.:(

Oct-31-08
Premium Chessgames Member
  Stonehenge: Way too easy for a Friday puzzle. More like a Tuesday puzzle.
Oct-31-08
Premium Chessgames Member
  YouRang: <kevin86: Black gives up both rooks...and follows with a quick win.>

Both rooks? :-)

Oct-31-08  tatarch: Kind of straightforward for a friday, no?
Oct-31-08
Premium Chessgames Member
  agb2002: The white knight is threatening a royal fork which would open up the g-column and place a very dangerous pawn on f6. On the other hand, the white king looks exposed. Therefore, 26... Rxe4:

A) 27.dxe4 Rxe4

A.1) 28.Qb8+ Bf8

A.1.a) 29.Rf2 Rxh4+ 30.Kg3 Rg4+ 31.Kh2 (31.Kh3 Qxg5) Kg7, threatening Bd6.

A.1.b) 29.Rae1 Dd2+ with a bishop ahead at least.

A.1.c) 29.Rad1 Re2+ 30.Kg3 Qg2+ 31.Rf4 Qg4 mate.

A.2) 28.Qf2 Bd4 29.Rad1 Qe5 30.Qg3 Rxh4+ 31.Kg2 Rg4 pinning the queen.

A.3) 28.Rad1 Rxf4 29.Rxd5 Rxf1 with a bishop ahead.

A.4) 28.Rfd1 Re2+ followed by ... Qg2 winning.

B) 27.c4 Re2+ winning.

I think its enough.

Oct-31-08
Premium Chessgames Member
  agb2002: I also missed 28.Qf3. My explanation is that this move neglects the protection of the weak entry point h4 and doesn't even gain a tempo (like 28.Qb8+).
Oct-31-08  garrido: 20.-Nh5?...(Ng4) seem is better
post mortum.
threaters 21.-Nf6 check
Oct-31-08  TheaN: 4/4 (Thursday skip)

<26....?>

White: a2, b2, c2, d3, g5, h4, Ne4, Ra1, Rf1, Qf4, Kh2

Black: a6, b5, c5, f7, h7, h5, Bg7, Re8, Re5, Qd5, Kg8

Material: = (-♗/♘)

Candidates: <[Rxe4]>

-ML-
For once, I'm not going to post my findings. At least not thoroughly: Rxe4 jumped out, dxe4 is forced, 27....Rxe4 is the only try, and with the threats of Be5/Bd6 if Qb8 with or without pawngain obliterates White. So I went as far as:

<26....Rxe4 27.dxe4 Rxe4> with the addition of <28.Qb8 Bf8> but neither defense works at any moment. I'm just not gonna give all of it... because I haven't done that yet at the point I'm above. The position is so trivially won.

Oct-31-08  Woody Wood Pusher: I saw 26...Rxe4! 27.dxe4,Rxe4! and spent a long time satisfying myself there was no adequate defense to mate and/or large material gain.

The 28.Qb8+,Bf8 line is the most aesthetically pleasing IMO,

The position after 27...Rxe4 is so promising I would go for it in a game without calculating all the lines, but seeing as this is a puzzle I spent the time looking for as many of the continuations a possible.

I missed 28.Qf3 because it does not deal with the problems in the position (like the h4 square) and is just bad.

Nov-01-08
Premium Chessgames Member
  kevin86: Oops,I made a mistake-actually black gave up only ONE rook.

Mate follows by :30 ♔f2 ♖h2+ 31 ♔e1 ♕d2#. White can throw the queen to the wolves,but mate is soon,anyway.

Nov-05-08
Premium Chessgames Member
  patzer2: For the Friday Oct 31, 2008 puzzle, Black
begins a mating attack against the helpless, exposed Black King with 26...Rxe4!
May-10-10  kingfu: Does 28 Qf2 hold?
May-12-10  kingfu: No, it does not hold. It just loses slower.
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