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Vladimir Potkin vs Fabiano Caruana
Russian Team Championship (2010), Dagomys RUS, rd 5, Apr-05
Slav Defense: Quiet Variation. Pin Defense (D12)  ·  0-1



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Kibitzer's Corner
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Premium Chessgames Member
  whiteshark: <30... Qc1+> The Sure Thing!
Apr-12-10  eblunt: Very strange. I had just seen it 30 secs before in todays Daily Telegraph.
Apr-12-10  gus inn: <eblunt> Interesting !?..might be your special day :)
Apr-12-10  gtgloner: If the black knight can get to b3, it's all over, so we need a deflecting move: 30. ... Qc1+ should suffice, as the white queen has no choice but to capture. Let's see.
Premium Chessgames Member
  wordfunph: indeed easy 30...Qc1+
Apr-12-10  patzer2: For today's Monday puzzle, the combined decoy and deflection sham Queen sacrifice 30...Qc1+! forces mate-in-two moves.

For an improvement, perhaps White should have tried 26. Rxd5 =, when Black may have been content with a draw by three-fold repetition after 26. Rxd5 Qg6+ 27. Ka1 Ne4 28. Qd1 Qc6 29. Kb1 Qg6 30. Ka1 Qc6 31. Kb1 Qg6 =.

Apr-12-10  patzer2: The alternative 30...Qxf3 also appears to be winning. However, after 30...Qxf3 31. Rb4 Qd3! forcing the win is not so easy. Also, if you can see 30...Qxf3 31. Qxf3?? Nb3#, then 30...Qc1+! 31. Qxc1 Nb3# should be a piece of cake.
Premium Chessgames Member
  johnlspouge: Monday (Very Easy)

Potkin vs F Caruana, 2010 (30...?)

Black to play and win.

Material: N+P for B. The White Ka1 is stalemated, suggesting that Black should examine the consequences of every check. The White Qd1 has the absolute burden of preventing both Nc5-b3# and Qe3-c1#, suggesting an overloaded piece. The Black Kg8 is secured from check.

Candidates (30...): Qc1+

30…Qc1+ 31.Qxc1 Nb3#

Apr-12-10  YetAnotherAmateur: Cute 2-mover: 30. ... Qc1+ 31. Qxc1 (forced) Nb3#

<patzer2> Qxf3 is only useful if white makes a mistake. On 30. ... Qxf3 31. Rb4. If 31. ... Nd3 (to win a rook) 32. Qxf3, because the threat of Nb3# is gone. Any effort to attack the b file with a rook results in white trading rooks and then grabbing the a-pawn.

Premium Chessgames Member
  thegoodanarchist: How could a 2600-rated player overlook such a simple tactic?
Apr-12-10  Cushion: Qc1+ mates next move.
Premium Chessgames Member
  gawain: Simple but unusual and very pretty. Nb3 would be mate but for the White queen. So 30...Qc1+ deflects the queen and forces the mate.
Premium Chessgames Member
  sethoflagos: An adventurous opening - 9. cxd5 does not have a happy history.
Apr-12-10  Patriot: This took me much longer than it should have--several minutes. I was about to settle on 30...Qxf3, seeing that 31.Qxf3 Nb3# and then spotted 30...Qc1+.

Usually the approach is to look at all checks, captures, and threats (in that order), but <johnlspouge>'s approach is very efficient with only one candidate. Seeing a stalemated king is indeed a big clue. I spent several minutes looking at silly moves (but none-the-less captures) like 30...Qxe1, 30...Qxd4, 30...Qxc3, 30...Nb3+, and the not-too-bad 30...Qxf3 before spotting the key 30...Qc1+!.

<<thegoodanarchist>: How could a 2600-rated player overlook such a simple tactic?>

That's easy...he's human! But I understand what you mean. If he made these oversights often he wouldn't be 2600. Who knows? Maybe he didn't get much sleep or had a fight with his wife or got distracted or was in time trouble, etc.

Apr-12-10  vanytchouck: As usual, let's take a look at the sexiest move:

30... Qxe1

Looking for a justification, i've seen quite easily that the queen is compelled to keep an eye on b3 otherwise it would be 31...Nb3 #.

Anyway,30...Qxe1 failed to 31.Bxe1.
So is there any other way to deflect the Queen? A really forcing one?

30...Qc1 +!! and it's over.

It took me around 5 seconds to see in that order the moves Qxe1, Nb3, Bxe1 and finally Qc1.

Apr-12-10  JG27Pyth: Nb3# if the b3 square were unguarded. Deflect the guard... I got that far in under 10 seconds... but then became distracted with various back rank ideas trying to attack e1 -- it took a minute to come back to the simple, direct: b3 is guarded once; just deflect the guard and it's over -- this second time around the forcing Qc1+ appeared.
Apr-12-10  desiobu: Had already seen this position before, I think on Susan Polgar's blog.
Premium Chessgames Member
  chrisowen: Trial is missing silken queen check. Ugly defence, the scar you analyze is nick top of the board Qxc1 Nb3 mates the crown. King will look for counsel yet receives none. Star gazing white parks Re1 then takes the bench. It was Qxe3 the bum freezer that wigs him.
Apr-12-10  jimmyjimmy: I still have not guessed the correct answer for any puzzle, even on Mondays. I stared at this one for a long while and was positive I was right by simply mating with the knight. I didn't notice white's queen! I have only been on this site for about a month and am a novice even though I have loved chess many years. I just never delved into it enough until now.
Premium Chessgames Member
  johnlspouge: < <Patriot> wrote: [snip] Usually the approach is to look at all checks, captures, and threats (in that order), but <johnlspouge>'s approach is very efficient with only one candidate. Seeing a stalemated king is indeed a big clue. [snip] >

"Examine checks, captures, and threats" is excellent basic advice, but it is generic and does not tailor itself to the demands of a particular position. Although I once followed it, it now only provides a fallback, in case other methods fail. Nowadays, my process is to examine for King mobility and safety first, and then to look for features like burdens, loose pieces, constricted pieces, and pins. The features often suggest a specific course of action, e.g., the constricted Ks today and yesterday demanded examination of the correct candidate.

Just in case my post gave the impression of magically honing in on 30...Qc1+, I also saw 30...Qxf3 as a completely safe move, because of the burdens on the White Qd1. My candidates are the "serious" ones and do not include every move I considered.

Premium Chessgames Member
  kevin86: The key to this one is to set up a mate at b3 by deflecting the queen away from its defense. Other moves offer an alternative move,Qc1+!! does not. THe queen MUST take!
Apr-12-10  kingfu: Does 30. Rb4 hold?
Apr-12-10  BOSTER: A long, long time ago when <CG> site was great and famous like brilliant chess virtuoso Bobby Fischer, they published the Daily Puzzles. Here is a brief summary,but not comprehensive description of puzzles' Rules. <The difficulty of Puzzles increases as the week progresses>. I guess this is a good reason to call them the weather sensitive (or week sensitive) Puzzles-WSP. This <CG> site was known not only because some WSP were really tough,not such like Plaskett's puzzle ,nevertheless, and very attractive for many players, but because they had a very strange, old weird custom. Every Monday, week after week, month after month, year after year they sacrifice the most beautiful woman in chess Kingdom- the Queen. The Monday's constancy, the monotony had destroyed such natural instinct as the inguisitiveness, and curiosity and as a result the feeling of beauty in chess had been evaporated as a first snow. Monday was known as the Queen sacr. day, and as a result many players played not a chess position, but they played "a day". Now look like such Monday spirit affected the thinking process of the players. Read this.
<zooter>.<It's an easy Monday... Monday means the sacr. of the queen!>. <stacase>. <Good ol' Monday,good ol'Queen sacrifice>. <patzer2>. <It's Monday and Qxh3! solves our puzzles>. <SamAtoms1980>. <That is no ordinary queen you have there on g4. Sacrifice it and the Genle will grant you your wish>. <kevin86> <Mate ... with queen sacr. Typical Monday>. <muralman> <What? No queen to sacrifice> <lost in space > .<I love Mondays!>. Don't skip such Monday puzzle definition : <whitehat>. <There should be a category called "Ridicuiously Easy">. Certainly not only Monday WSP had the feeling, every day had something special. Follow <remolino>.<I would offer the exchange in a different way then and try 36...Rd1. Only because it is Sunday. On a Wednesday I would play _36...Rxc3, but on Sunday I play 36...Rd1>. Today this sounds a little bit strange, but many years ago such innovations were in fashion among <CG> players. But stricktly speaking, who really knows what the correllation exists between "the day of week" and "making the decision in chess" even for OTB games. The raising to SUNday like sunflower a spiral of difficulty WSP attracted many curious visitors as Brazil carnival, but was not able to destroy the Monday expectations. <scormus>.
<Never thought I'd say it but ... thank Goodness it's Monday>.
Apr-12-10  muralman: These puzzles, over a year of doing them, have helped my understanding of chess theory.

Monday is suppose to be easy. This Monday puzzle requires at least a modicum of chess savvy.

I looked over the board, and saw two ready players, the knight on C5, and the Queen at E3. The Pawn onA2 makes it all work. Sacrificing the queen wins the checkmate.

The beauty of this attack is how the attacking pieces also strangle the white Queen. It is helpless in fending off the attack.

Apr-12-10  Major Dude: Pretty Mate. Too easy.
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