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Jan Smeets vs Le Quang Liem
Olympiad (2008), Dresden GER, rd 7, Nov-20
Sicilian Defense: Dragon Variation. Yugoslav Attack Modern Line (B76)  ·  0-1
ANALYSIS [x]

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sac: 45...Rfxb4+ PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
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Mar-18-09
Premium Chessgames Member
  johnlspouge: Wednesday (Medium/Easy)

J Smeets vs Le Quang Liem, 2008 (45...?)

Black to play and win.

Material: N for B+P. The White Kb3 has 5 legal moves. Black has a battery Qh4 and Rf4 attacking Pb4 in concert with Rb7. The Black Ng7 is purely defensive and is attacked by the White battery Qg1 and Rg6. The Black Kh7 is insecure and subject to checks from the g-file battery.

Candidates (45): Rfxb4+, Rbxb4+

45Rfxf4+

(1) 46.Ka2 Ra4#

(2) 46.Kc2 Rb2+

(2.1) 47.Kc1 Qe1+ 48.Rd1 Rb1+ 49.Kc2 Qxd1#

(2.2) 47.Kd1 Rb1+ 48.Kd2 [Ke2 Qe1#] [Kc2 R7b2#] Qe1+ 49.Kc2 R7b2#

(3) 46.cxb4 Qxb4+ 47.Kc2 [Ka2 Qb2#]

47Qb1+ 48.Kd2 Rb2+ 49.Ke3 Qe1+ 50.Be2 Qxe2#

I consider Variations (1) and (2) overkill: it is really enough to note that on refusal of 45Rfxf4, Black wins a P and puts the White K on a fatal run, given the congestion around e2.

Mar-18-09  SmotheredKing: Alright, Im not sure I have the variations right, but here it goes:

45...Rfxb4+!!
46. cxb4(or drop a P with an exposed K) Qxb4+

a)47.Ka2?? Qb2#
b)47.Kc2 Qb1+
b.1)48.Kd2 Rb2+
49.Ke3 Qe1+
50.Be2 Qxe2#
b.2)48.Kc3 Qb2+
49.Kc4 Rb4#

Time to see if this is right.

Mar-18-09  nuwanda: obvious and easy, surely no wednesday-level

interesting to see that most solvers did not mention 48.Kc3 and almost all not 49.Kc3

Mar-18-09  StevieB: I think a Monday puzzle accidently slipped in today. EZ
Mar-18-09  DrGridlock: <dzechiel - "Why not 45...Rbxb4+? Because the f-rook is blocking the queen from the action.">

Another reason is that taking with the f-rook doubles rooks on the b-file, allowing the check on b2 if the king moves to c2.

Mar-18-09  njchess: I got this one easily. Even the question of which rook only took a moment to decide. The theme of working a piece behind the opposing king, thereby cutting off his retreat, gets another workout today (e.g. Qb1+ followed later by Qe1+ in the forced sequence.) Feels a bit like a Monday.
Mar-18-09  zb2cr: Found this one after perhaps 45 seconds of thought. I have nothing to add to the fine explanations by <CHESSTTCAMPS>, <TheaN>, <agb2002>, <dzechiel>, and <petrie911>.
Mar-18-09  zb2cr: Hi <nuwanda>,

You wrote: "...interesting to see that most solvers did not mention 48.Kc3 and almost all not 49.Kc3"

Even with my poor board vision, I could see that 48. Kc3? fails to 48. ... Qc1#. Same deal with 48. Kd2, Rb2+; 49. Kc3?, Qc2#. I guess many of the posters here didn't quote the variations exhaustively after some point.

Mar-18-09  Utopian2020: I solved the puzzle looking first at Rfxb4+. Then I looked to see if Rbxb4+ also leads to mate, which it doesn't.
Mar-18-09
Premium Chessgames Member
  kevin86: Pretty easy today-I figured out the solution AND the escape on the inferior move:

45...♖fb4+ 46 cxb4 ♕xb4+ 47 ♔c2 ♕b2+? 48 ♔d1 ♕b1+ 49 ♔e2 ♖b2+ 50 ♖d2 etc

The right move is 47...♕b1+ 48 ♔d2 ♖b2+ 49 ♔e3 ♕e1+ 50 ♖e2 ♖xe2#

Mar-18-09
Premium Chessgames Member
  Jimfromprovidence: <dzechiel - "Why not 45...Rbxb4+? Because the f-rook is blocking the queen from the action.">

<DrGridlock> <Another reason is that taking with the f-rook doubles rooks on the b-file, allowing the check on b2 if the king moves to c2.>

Just to add to the above thread here is the position after 45Rbxb4+ 46 Kc2.


click for larger view

Now its blacks turn to worry because he has to immediately answer whites threat of Rxg7+ with quick mate. Plus his rook is now en prise.

So he must play 46Rb7 at this point to avoid disaster.

Mar-18-09
Premium Chessgames Member
  YouRang: After blowing yesterday, I didn't want to miss today. And I think I see the idea: sac a rook to get a Q+R attack going on the q-side:

With 45...Rfxb4+ 46.cxb4 Qxb4+ 47.Kc2, and now I can make use of both the a & b files with 47...Qa4+!

If 48.Kd2, then 48...Rb2+ 49.Ke1 <49.Ke3 Qf4#> Qa1+ 50.Rd1 Qa5#!

If 48.Kc3, then 48...Rb3+ 49.Kd2 Rb2+ 50.Ke1 Qa1+ 51.Rd1 Qa5# again!

If 48.Rb3, then 48...Qxc3+ 49.Kd2 Qb4+ <I want to get my Q on a different file than the rook *with check*> 50.Ke2 Qc4+ <done!> 51.Kf2 Rb2+ 52.Kg3 Qf4+ 53.Kh3 Qf5+ <winning the other rook and black has an easy win>

===
Looking at the answer, I see that I missed a much faster (and very clever) mating line, but at least I found a winning line. :-)

Mar-18-09  Riverbeast: Is 12. Nb5 a real move in this opening?

It looks like a huge waste of time to me

Mar-18-09  ex0duz: <dzechiel: 45...Rfxb4+, 46 cxb4 Qxb4+, 47 Kc2(Not 47 Ka2 Qa4+ 48 Ra3 Qc2+ 49 Ka1 Rb1#.)>

In your 47.Ka2 variation, why play 47.Qa4+? You really didn't see the immediate 47.Qb2# after black plays Ka2? I know it's a moot point since both are unavoidable paths to mate, but in the interest of the 'best' and quickest mate, i think it should at least be noted.

Otherwise good analysis as always.

Mar-18-09  outplayer: Not really a complete solution to me since I thought of playing 47...Qb2+ which doesn't lead to mate.
Mar-18-09  SpoiltVictorianChild: I found this easier than yesterday. Yesterday I spent a lot of time trying to get a mate and missed snagging the queen. Today was a little more clear about what to do and just took calculating alternatives.
Mar-18-09  mworld: Got the first few moves easy, but I think the real trick was seeing that Qb1+ was the winning move and that Qb2+ did not lead to mate (which was my instinctual first move).
Mar-18-09
Premium Chessgames Member
  DarthStapler: Got it
Mar-18-09  WhiteRook48: terrific, but I thought black should take Rbxb4+ instead
Mar-18-09
Premium Chessgames Member
  Sneaky: 45...Rbxb4+? Kc2! which my computer assess as although I think ∞ is a more fair label. It's definitely the wrong rook to sacrifice when you could have a forced mate instead.
Mar-18-09  TheBish: J Smeets vs Le Quang Liem, 2008

Black to move (45...?) "Medium/Easy" (2 stars)

45...Rfxb4+! is the beginning of a mating attack, for which there is no defense.

A) 46. cxb4 Qxb4+ 47. Kc2 (47. Ka2 Qa4#) Qb1+ and now:

A1) 48. Kc3 Qb2+ 49. Kc4 Qxb4 mate.

A2) 48. Kd2 Rb2+ 49. Ke3 (or 49. Kc3 Qc1#) Qe1+ 50. Be2 Qxe2 mate.

B) 46. Ka3 (or Ka2) Ra4 mate.

C) 46. Kc2 Rb2+ and now:

C1) 47. Kc1 Rb1+ 48. Kd2 (or 48. Kc2 R7b2#) Qe1+ 49. Kc2 Qc1 mate.

C2) 47. Kd1 Rb1+ 48. Kd2 (if 48. Kc2 R7b2#, or 48. Ke2 Qe1#) Qe1+ (we have transposed to C1) 49. Kc2 Qc1 (or R7b2) mate.

Mar-18-09  TheBish: Interesting, but I missed a quicker mate (by one move) in line A1 above with 48...Qc1 mate.
Mar-18-09  SamAtoms1980: Heavy like a Tyson blow to the dome
Back up son, give me room, GIVE ME ROOM
To set it off like this don't give it up
I'm all up in you 'til you just can't get enough
Real hard to the bone, you want more
I sneak up on you like a sniper at your back door
Mar-18-09  Geronimo: Black position wins with a rook to spare. Simple.
Mar-28-09
Premium Chessgames Member
  patzer2: For the Wednesday, March 18, 2009 puzzle solution, White initiates a mate-in-six with 45...Rfxb4+!

In the final position, play could go 48. Kd2 Rb2+ 49. Ke3 Qe1+ 50. Be2 Qxe2#.

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