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Carlos Hugo Maderna vs Ruben Shocron
Mar del Plata (1953), Mar del Plata ARG, rd 12, Mar-28
Queen's Gambit Declined: Capablanca Variation (D30)  ·  1-0



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find similar games 3 more C H Maderna/R Shocron games
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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 3 OF 3 ·  Later Kibitzing>
Jul-21-11  abuzic: After 39.Rxc4 black palyed 39...Rxc4, which is the best response here.

If <39...a4?> 40.Rxc5 a3 (40...Rb8 41.Rxb8+ Qxb8 42.Rc8+ Qxc8 43.Rxc8 Kh7 44.Ra8) 41.Qc3 (or Qxa3) and black has nothing to play.

Jul-21-11  tacticalmonster: a) 39 Rxc4 Rxc4 40 Rxc4 Qxc4 41 Nf5 f6 (41 Kf8 42 Qxg7+ Ke8 43 Nd6+ ) 42 Qb7 Qf7 43 Qxa8+ Kh7 - White is up a piece

b) 39 Qb3 Rc8 40 Nb5 Qc6 41 Na3 a4 42 Qb3 Rb8 43 Qc3 Nxa3 44 Qxc5 Qxc5 45 Rxc5 - White is up an exchange

Time spent: 5 mins

Jul-21-11  abuzic: <tacticalmonster:....
b) 39 Qb3 Rc8 40 Nb5 Qc6 41 Na3 a4 42 Qb3 Rb8 43 Qc3 Nxa3 44 Qxc5 Qxc5 45 Rxc5 - White is up an exchange>

39.Qb3 black plays 39...a4:

a) 40.Qb4 Rb8 41.Qxa4 Nb2
b) 40.Qd3 Rc8 41.Nf5 Qe5
c) 40.Qc3 Qb7 41.e4 g6
and that's it).

Jul-21-11  The HeavenSmile: What day is it today? I didn't see that at all. Went with Qb3 which i'm sure wins at least a knight for rook exchange
Jul-21-11  sevenseaman: White is in great luck. He is on move in the simplest of positions.

39.Rxc4 Rxc4 40.Rxc4 Qxc4 41.Nf5 (Q threatens mate on g7) f6 42.Qb7 (renews the threat)Qf7(only defense) 43. QxR+ 1-0.

Jul-21-11  David2009: C H Maderna vs Shocron, 1953 White 39?

39,Rxc4 Rxc4 40.Rxc4 Qxc4 41.Nf5 f6 (if 41...Kf8? 50.Qxg7+ Ke8 51.Nd6+ wins the Q) 42.Qb7 Qf7 (the check on c1 does not help) 43.Qxa8+ Kh7 52.Qxa5 leaves White N and two Pawns up with a much more secure King. Time to check:
Got it - makes up for yesterday's loss. Here's the puzzle position

click for larger view

and a link to Crafty End Game Trainer:

The EGT delays defeat with 40...Rb8! instead of 40...Qxc4 which leaves White a N up in a straightforward ending. Enjoy practicing your winning technique!

Excellent and thought-provoking post by <sfm>.

Jul-21-11  zb2cr: Missed, missed, missed. Did not see how to exploit the situation after Black recaptured for the 2nd time on c4.
Jul-21-11  CHESSTTCAMPS: White is up a pawn, but faces a challenging technical task in converting the kingside majority to a win. Black threatens Nxb2, so the "blitz" reflex is to reinforce the pin with 39.Qb3. This would be a big missed opportunity, as I found belatedly after about 10 minutes of missing the point.

White wins quickly with the forcing 39.Rxc4! Rxc4 40.Rxc4 Qxc4 41.Nf5 and now black must drop at least a rook to stop the mate threat:

A) 41... f6 42.Qb7 Qf7 (Qc1+ 43.Kh2 mates in 4) 43.Qxa8+ Kh7 44.Qxa5 and black can resign.

B) 41... Kf8 42.Qxg7+ Ke8 43.Nd6+ wins.

Leonard Barden observed in his chess column that the Q+N combination is preferable to Q+R in many situations, but there are more subtle examples than this. Does anyone have a game collection with this theme?

Premium Chessgames Member
  agb2002: White is a pawn ahead.

Black threatens 39... Nxb2.

The black castle looks defenseless, especially after 39.Rxc4 Rxc4 40.Rxc4 Qxc4 41.Nf5:

A) 41... f6 42.Qb7 Qf7 43.Qxa8+ Kh7 44.Qxa5 and the advance of the a-pawn quickly decides the game.

B) 41... Kf8 42.Qxg7+ Ke8 43.Nd6+ wins the queen (better than 43.Qg8+).

C) 41... Qg4 42.hxg4, etc.

Jul-21-11  Patriot: Time spent: ~5 minutes

All I could think of was 39.Qb3 but then you have to look at 39...a4, 39...Rb8, 39...Nd2. I considered 39.Rxc4 but didn't follow it through because it didn't "look" safe. It seemed that 39...Rxc4 was just winning and that's really as far as I calculated that line. I'll have to be more careful about that mistake next time.

Jul-21-11  CHESSTTCAMPS: To supplement the Crafty EGT link to the puzzle position from <David2009>, I offer a similar link to the (final) position at move 41, because Crafty avoided the game defense:

Another position arises after the line 41... Kf8 42.Qxg7+ Ke8 43.Qg8+? (Nd6+) - see if you can still win after making this small slip:

Premium Chessgames Member
  kevin86: The final position is amusing;white threatens mate and black has no answer.
Premium Chessgames Member
  doubledrooks: 39. Rxc4 Rxc4 40. Rxc4 Qxc4 41. Nf5 and now:

a. 41...f6 42. Qb7 Qf7 43. Qxa8+

b. 41...Kf8 42. Qxg7+ Ke8 43. Nd6+ and 44. Nxc4

Premium Chessgames Member
  Phony Benoni: <Gilmoy> Just for the record, I update my puzzle collections right after the position comes up at Midnight Eastern Time in the U.S. Last night, I didn't feel much like kibitizing; we've got the heat wave here and I don't have air conditioning at home.

But now I'm on my lunch hour at work...

click for larger view


In glancing at this last night, I got hung up on 39.Nb5 Nxb2 40.Nxc7 Rxc2 41.Rxc2 Rc8. Nothing except the original extra pawn in a rook ending.

I think the difficulty today comes from having the Quiet Move after the fireworks. If the puzzle position had been <41.?> instead:

click for larger view

This is a Monday. 41.Qb7 doesn't accomplish anything, so 41.Nf5 is the only move that stands out. Then it slowly dawns that Black has to play 41...f6, and now 42.Qb7 is a winning double attack.

It's generally easier to see and calculate the consequences of quiet moves earlier in the combination. When you have to start a couple of moves earlier, as today, the position gets kind of fuzzy and you're more likely to instinctually dismiss the whole idea as not working.

Jul-21-11  DarthStapler: Got it
Jul-21-11  mworld: seeing nf5 early is the key to this one. seems like a much simpler week than last week.
Jul-21-11  Creg: Save the queen with something like 39.Qb3? Rarely is that the right answer in such puzzles, so I, along with many here, look for more. How about our knight? 39.Ne6 would be nice, but the simple 39...fxe6 gets us nowhere. 39.Nf5 would be a nice mate threat, but can we set it up to our advantage, without losing our queen in the process?

39.Rxc4 Rxc4 40.Rxc4 Qxc4 41.Nf5. We have a mate threat at g7, and I don't see how the black queen can defend that square. I think 41...f6 is required, and it looks forced as 41...Kf8 won't change the outcome. So back to our main line.

41...f6 42. Qb7 we now attack rook at a8 and threaten mate at g7 again. Both cannot be defended. I believe this is it and White wins. I am doing this in notepad, David Z style...:) Lets post, and see how this works out.


I was right this time, but I get more wrong than right as the puzzles get harder.

Jul-21-11  BOSTER: The pinned knight on c4 dazzles me.
I was not able to switch my attention to see unprotected rook a8. Somebody call it as electoral blindness.
So, I tried to use the pin, and and then gave up.
But after 39.Rxc4 Rxc4 40.Rxc4 Qxc4 black position has two weaknesses- rook on a8 and g7. And this solution is another proof that unprotected pieces are often the targets for double attack.
Jul-21-11  M.Hassan: "Medium" White to play 39.?
White is a pawn up.
After testing several moves, I thought it is best to remove the attacker to the White Queen:

39.Rxc4 Rxc4
40.Rxc4 Qxc4
And the crucial move occurs now:
Threatening mate on g2. The most probable defense of Black would be:

42.Qb7 Qf7 (I don't see any better move for Black than this) 43.Qxa8+
And White ends up in great material advantage
Time to check
Spot on

Premium Chessgames Member
  al wazir: <39. Qb3 a4 40. Qb4 Rb8> 41. Qxa4. White is two ♙s up and the black ♘ is still pinned.
Jul-21-11  Marmot PFL: Thursday is where I sometimes begin to have problems. (This week I think it was Tuesday though, must be the heat.) Anyway it seems that white must either move the queen or play Rxc4. None of the queen moves lead to a win, but I might play one anyway unless I was certain that 39 Rxc4 Rxc4 40 Rxc4 Qxc4 41 Nf5 led to a win. I saw 41...f6 42 Qb7 but was not sure f6 was forced (or Kf8 Qxg7+ Ke8 Qg8+ and Qxa8)...It looked like it was but I have played sacs like that before and missed obvious defenses. Just shows the striking difference between the active Knight coordinated with the queen and the passive rook.
Jul-21-11  WhiteRook48: tunnel vision, I saw up to 41 Nf5 but thought that 41...f6 is enough to defend. 42 Qb7 - I should study forks more.
Jul-21-11  stst: Not that easy!
Try one line (almost sure to miss...)
39.RxN RxR
40.RxR QxR
41.Nf5 f6
42.Ne7+ Kh7
43.Qb1+ Kh8
44.Ng6+ Kg8
45.Ne7+ Kf7
46.Qb7 Re8
47.Nf5dis+ Kg6
48.Nd6 forks Q&R will win...
Jul-21-11  stst: Curiously & Lucky enough!?
"Insanely Brilliant by Maderna...." - and I am a modern version??

By logic, since the WQ is under attack by the Bk N, and W has no immediate potential attack, the reasonable move is to either hide the Q, or remove the Bk N... Looking forward for the scenario after a series of exchanges led me to the "solution," W gained posture even exchanging down....

Premium Chessgames Member
  LIFE Master AJ: Thursday; July 21st, 2011

Carlos H. Maderna - Ruben Shocron (2259)
Mar del Plata, ARG; (R#12) / 1953.

click for larger view

White: Kg1, Qb2, Nd4, R's c1 & c2; WP's - a2, e3, f2, g2 and h3. Black: Kg8, Qc7, Nc4, R's a8 & c5; BP's - a5, f7, g7 and h6.

White to move: 39. '?'

This one had me stumped for a while, I considered a sack on c4 but I did not immediately see the follow-up.

39.RxN/c4, RxR/c4; 40.RxR/c4, QxR/c4; 41.Nf5, f6▢; This is forced.

[Less good is 41...Kf8; 42.QxP/g7+, Ke8; 43.Qg8+, and 44.QxR/a8 ]

Now the DOUBLE THREAT of QxP/g7# and QxR/a8+ should win easily for White.

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