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Alex Astaneh Lopez vs Eric Schiller
Tradewise Gibraltar (2012)  ·  Zukertort Opening: Grünfeld Reversed (A49)  ·  1-0
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sac: 42.Rh8+ PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
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Feb-10-12
Premium Chessgames Member
  morfishine: Cast my lot with the <41.Rh8+> crowd

Looked briefly at <41.Qd2> but not <41.Qc1>

<LoveThatJoker> Nice work on <41.Qc1>

<sevenseaman> Good job: a little sleep got you on the right track

Feb-10-12  LoveThatJoker: <morfishine> Thanks for the compliment, man!

Sincerely appreciated,

LTJ

Feb-10-12
Premium Chessgames Member
  OhioChessFan: I was with the Rh8+ crowd. Pretty tactical for me, but it looked sufficient. I think <sofouuk> line is correct.
Feb-10-12  galdur: Fail. Was stuck on 41.Rh8+ followed by Qg6. Qd2 seems to be one of those <invisible> moves.
Feb-10-12  abuzic: 41.Qd2 Qd1

<41...Qb4 42.Ng5+ hxg5 43.Qxg5 Nd5 44.Bxd5 exd5 45.Qf6 followed by Rh8# which cannot be stopped>;

<41...Qa5 42.Rd7+ Bxd7 43.Qxd7+ Kh8 44.Qe8+ Kg7 45.Qe7+ Kg8 46.Bh3 followed by Bxe6+ wins>;

<41...Be8 42.Qd6 Nd5 43.Qxe6 Nc7 44.Qe7+ Kh8 45.Nh4 Qc2 46.Qf8+ Kh7 47.Bd5 Nxd5 48.Rxe8 followed by Qh8# or Re7# cannot be defended>;

<41...Ne4 42.Qf4 Be8 43.Qf8 Rxf3 44.Bxf3 Ng5 45.Bxb7 and black has no effective defence here like 45...Qg4 46.Rxe8 Qh3+ 47.Kg1>

<41...Qg4 42.Qd6 Nd5 43.Qf8 Qh5+ 44.Nh4 followed by Qh8# cannot be defended>

42.Rh8+ Kxh8
43.Qxh6 Kg8
44.Qxg6+ Kf8

<44...Kh8 45.Ng5 Qd7 46.Nf7+ Qxf7 47.Qxf7>

45.Ng5 Qd7
45.Nxe6+ Qxe6

<46...Ke7 47.Qg7+ Kxe6 48.Qf6#>

45.Qxe6.

Feb-10-12  abuzic: 41.Qd2 Nd5 42.Rh8+ Kxh8 43.Qxh6+ Kg8 44.Ng5 Nf6 45.Qxg6+ Kh8 46.Nf7#.
Feb-10-12  Dr. J: If 41 Rh8+ Kg7(!) seems OK for Black since 42 Rg8+ Kxg8 43 Qxg6+ Kf8 allows the Black King to escape.

Can anyone definitively settle Qd2 vs. Qc1? Are they equal?

Feb-10-12  Penguincw: As usual, I miss the winning tactic.
Feb-10-12
Premium Chessgames Member
  sevenseaman: <Dr. J> <Can anyone definitively settle Qd2 vs. Qc1? Are they equal?>

41. Qd2 gives White the added option of getting into the battle zone via d6, e7 as well, a point that was h/l by <pedro123>. 41.

Feb-10-12  gofer: The <Crafty> site roles out a similar position very 10-15 days, where the rook sac on the 8th rank allows the queen to invade with check.

This puzzle has two differences;

1) the queen invades without check
2) black's defenses are far too disorganised to get back and help! a) Bc5 is blocking Qa4
b) Nc3 and Qa4 are blocking Ra3
c) There is no check available to white for two or three moves!

Having looked at this one for far too long I think that the immediate 41 Rh8+ is one move too soon. The invasion without check is just not quite good enough. So instead I think we change focus to move the queen onto a square where it is invasion with check AND more importantly it opens up options along the d file!

<41 Qd2 ...>

Suddenly we threaten to expose the king with Qd6 or Rh8+. I see no good moves for black.

41 ... Nd5 42 Rh8+ Kxh8 43 Qxh6+ Kg8 44 Ng5 mating

41 ... g5 42 Nxg5+ hxg5 43 Qxg5 Be8 44 Qe7+ Kh6 45 Rxe8 winning

41 ... Be8 42 Qd6 Nd5 43 Ng5+! hxg5 44 Bxd5 winning

Time to check...

Feb-10-12
Premium Chessgames Member
  Memethecat: First impressions: Swap Qs & attack e6 with the N. Let's run with that. <41Qxa4 Rxa4> R gives the R more scope, blacks pieces more co-ordination & yet another piece on the side lines ain't good. <42Nd4 Bc4> I've lost confidence in this line. Rh8+ is forcing & worth a look.

a<41Qd2 Nd5 42Rh8+ Kxh8 43Qxh6+ kg8 44Ng5 Be8 45Qh7+ Kf8 46Nxe6#>

b<41Qd2 Nd5 42Rh8+ Kxh8 43Qxh6+ kg8 44Ng5 Bd7 45Qh7+ Kf8 46Qf7#>

41...Ne4 & 41...Be8 seem to hold for black.

***

Well I missed Qb4 but it made no difference to the win.

5/5

Feb-10-12
Premium Chessgames Member
  Memethecat: Unbelievable!! This is the 1st time I've been in such a tiny minority of kbzrs able to solve a POTD. Suddenly my day seems so much brighter, I must be improving.

Now can anyone help? Here, I can analyse several lines 3,4,5 moves deep, but when I'm playing, not a chance. How do you transfer that skill to the board?

Feb-10-12
Premium Chessgames Member
  Once: <Memethecat> Don't know if it's a definitive answer, but this is a thought that helped me in the past...

By definition, the positions on POTD are ripe for tactics. They are crispy, crunchy, gnarly. There's stuff to do, pieces to move, checks to make. You can almost feel the tension crackling in the air.

By contrast, most of the positions in a normal game are less forcing. Unless you are playing some crazy gambit line you are bound to spend more of your time in quieter positions. And for these positions it simply is very difficult to calculate lots of deep variations. Your opponent has far too many choices.

So I tend to look for "POTD" type positions in my games. Positions which are ripe for tactics, where your opponent has only one or two responses instead of a dozen. And when I get one of these positions I knuckle down like it's a POTD and analyse the variations.

Doing lots of POTD can make you think that all positions are going to be POTD-like. The reality is that they are not. Trying to treat them all as if they were puzzles can be very frustrating.

Mind you, I don't know why I am trying to give you advice! You got today's solution and I didn't ;-)

Feb-10-12  cydmd: The goal is to invade Black's position with the white queen.

41.Qd2!! is indeed a finesse. It's a double threat because Black must not allow 42.Qd6. Then, 41... Qb4 is a natural solution (42... Ne4 fails because of 42.Qf4).

A strategical goal enabled a tactical blow with 42.Rh8+. That's why I missed today's POD. I was only concerned with tactical issues.

Feb-10-12
Premium Chessgames Member
  David2009: A A Lopez vs E Schiller, 2012 White 41?

Try 41.Qc1 threatening Ng5+ GOOT!. Threats are Rh8+ or (if the Q moves off the 4th rank) Ng5+ in some variations. 43...Nd5 allows Rh8+ etc, Ne4 allows Qc7+.

Black is a Pawn up and has offered a Queen exchange. Before spotting 41.Qc1 I spent a long time analysing 41.Rh8+!? aiming for a draw by perpetual check: Kxh8 (if Kg7 Rg8+ wins a tempo) 42.Qxg6. White now threatens Qxh6+ followed by Ng5, so 42...Ne4 Now 43.Qf7 fails to force the draw by repetition because of 43...Be8 defending f7, so White has to continue the attack: 43.Qxh6+ Kg8 44.Qxe6+ Kf8 (Black plays for the win) Now 45.Qd6+??? loses the Q so 45.Ng5 seeing 45...Nxg5 46.Qh6+ or alternatively 45.Qh6+ Ke8.

Worse is 41.Ng5+ hxg5 42.Rh8+ Kxh8 43.Qxg6 and Black cannot play Ne4. Instead 43...Be8 44.Qxh6+ Kg8 45.Qxe6+ Bf7 and White is busted. Time to check:
====
White chose Qd2 which allows Ne4. Time to set up the puzzle position


click for larger view

on Crafty Endgame Simulator: http://www.chessvideos.tv/endgame-t...

Both 41.Qd2 and 41.Qc1 seem to win. Against 41.Qc1 the robot tries 41...Ra2 when the direct attack fails (to rxf2 at the appropriate moment) but 41.Qxc3 picks up a piece. Against 42.Qd2 the robot prefers 41...Qd1 to Ne4, allowing the combination but defending by giving up Q for R+N which ought to win for White.

Enjoy exploring the variations!

Feb-10-12  adbat: After 41.Qd2/Qb4 believe that the most accurate is 42.Ng5/hg5 43. Qg5 and mate
Feb-10-12  Dionysius1: I got some of the ideas, but not the solution. I was working on 41 Ng5 and 42 Ne4 to make the space for 43.Qc7. Hmmm. Never mind, I got through round 4 (Thursday).
Feb-10-12
Premium Chessgames Member
  kevin86: I saw that the sac at h8 was in the offing,though not on the first move.

White was able to deeply penetrate the opponent's perimeter.

Feb-10-12  rilkefan: Another 41.Rh8+. I glanced at Qd2, which looked strong in principle, but didn't feel like contemplating all the possible black replies.
Feb-10-12
Premium Chessgames Member
  scormus: <pedro123: .... White's primary threat after 41.Qd2 is 42.Qd6 threatening Qe7 .... >

Well spotted! I completely missed the impending devastation after Qd6. My earlier assessment of Qc1 vs. Qd2 looks flawed.

Good puzzle.

Feb-10-12
Premium Chessgames Member
  ajile: Eric Schiller only rated 2109 in 2012?
Wow.
Feb-10-12
Premium Chessgames Member
  Marmot PFL: Quiet moves are often the hardest to find, but Master Schiller makes it look easy with 41 Qd2!
Feb-10-12
Premium Chessgames Member
  ajile: lol yeah
Feb-10-12
Premium Chessgames Member
  ajile: except Schiller is BLACK in this game.

:o)

Feb-10-12  BOSTER: Why do all black pieces abandon their king?
The lack of previous events don't give any possibility to describe all detailes of such fast flight.

But maybe the main <enemy> among black's forces is <own> pawn e6 , who separates black queen from protection h6 square.

I saw 41.Qd2 with idea to play then Rh8 and take Qxh6 with tempo, but black can play Qg4 and transfer the queen on the king's side.

41.Rh8+ Kxh8 42.Qxg6 Qe4 43.Qf6+ Kg8 44.Bh3 Nd5 45.Bxe6+ Kh7 46.Bf5+ Kg7 47.Qd8+ and white is better. Of course there are many other lines.

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