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Konstantinos Siembos vs Tamaz Gelashvili
3rd Open (2001), Patras GRE, rd 1, Jul-18
Pirc Defense: General (B07)  ·  0-1
ANALYSIS [x]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Oct-21-08  stacase: This is a "Where does my Knight want to go?" puzzle. Hmmmm, let's see, if Black's Queen weren't there ...
Oct-21-08  zb2cr: Black wins a killing amount of material by 25. ... Qxb2+! White has only 2 moves: 26. Kd1 or 26. Qxb2.

If 26. Qxb2, Nxd3+! Now, White has 4 possible King moves. 27. Kd1 or 27. Kd2 transparently allow Black to finish up by a Rook by capturing 27. ... Nxb2. 27. Kc2 is even worse--27. ... Rxb2+; 28. Kxd3, Rxf2 and Black is ahead by 2R+P vs. N. 27. Kb1 initially looks like it loses only the exchange; but 27. ... Nxf2! again leaves Black up by a full Rook.

If 26. Kd1, Nxd3 threatens ... Qc1#. Either of White's defensive tries loses material; 27. Qxb2, Nxb2 leaves him down a full Rook, 27. Qxd3, Qxf2 leaves him down by 2R+P vs. N.

Oct-21-08  TheaN: 2/2

A point for the sub variation and main variation up to Nxd3†, and for finding the last move OTB.

<25....?>

White: b2, d5, e4, g4, h5, Nc3, Rd3, Rf2, Qe2, Kc1

Black: a6, c7, f7, g6, h6, Ne5, Rb8, Rf8, Qb4, Kg8

Candidates: Nxd3, <[Qxb2†]>

-ML-
Ok, this 'puzzle' is a bit weird. IMHO, Nxd3 wins the exchange fair and square. Seeing this, the main variation should win more, but at first sight it only seems to simplify with a pawn to boot.

<25....Qxb2†!> the fork that comes up will destroy White, but hiding on the back rank is fatal too.

-/A\
<26.Kd1 Qa1†>

--/AA\
<27.Kd2 (Kc2 Rb2‡ 0-1) Nc4† 28.Kc2 Rb2‡ 0-1>

--/AB\
<27.Nb1 Rxb1† 28.Kd2 (Kc2 Qb2‡ 0-1) Nc4† 29.Kc2 Qb2‡ 0-1>

-/B\
<26.Qxb2 Nxd3†>

--/BA\
<27.Kc2 Rxb2† 28.Kxd3 (Kd1 Rxf2 ) Rxf2 >

--/BB\
<27.Kd2 Rxb2† 28.Kxd3 (Ke3 Nxf2 ) Rxf2 >

--/BC\
<27.Kd1 Rxb2 >

--/BD\
<27.Kb1> now here I saw, as with many others, the very simple continuation <27....Rxb2† 28.Rxb2 Nxb2 29.Kxb2 Rb8† < >>, and I saw this as a very forced simplification and an easy endgame and quit looking, but the winning move is one to be found OTB:

<27....Nxf2! >

Oct-21-08  gtgloner: Well, this is pretty obvious, 25. ... Qxb2+ 26. Qxb2 Rxb2 and whichever way the Black rook on b2 is recaptured, 27. ... Nxd3+ is winning.
Oct-21-08  Woody Wood Pusher: Pretty complicated for a Tuesday IMO, especially to find the best winning line when both 25..Nxd3+? and 25..Qxb2 26.Qxb2,Nxd3+ 27.Kb1,Nxb2? still probably go on to win!

27..Nxf2! is even better of course.

Oct-21-08
Premium Chessgames Member
  chrisowen: Looks like Konstantinos Siembos tallies 19.a3 as a score when infact, it alongside the g/h pawn pushes, are lemons. For starters in the market of trading white should have tried concentrating on eg 21.Na2 Qb6 Qf2.
Oct-21-08
Premium Chessgames Member
  johnlspouge: Tuesday (Easy):

K Siembos vs T Gelashvili, 2001 (25…?)

Black to play and win.

Material: Even. The White Kc1 has 4 legal moves. Black has a battery Rb8 and Qb4 on the b-file aimed at Pb2, which is guarded by the White battery Rf2 and Qe2. Black has a centralized Ne5, which can capture Rd3 with check, so Black has the exchange in hand. The 2 objects for the Black attack suggest a zwischenzug combination simplifying the position and reducing White's chances of resistance.

Candidates (25…): Qxb2+, Nxd3+

25…Qxb2+ 26.Qxb2

[26.Kd1 Qa1+ followed by …Rb2+ picks up Q for R and then the exchange.]

26…Nxd3+ 27.Kb1 [other K moves drop at least a R after 27…Rxb2]

27…Rxb2+ 28.Rxb2 [else, drop a R] Nxb2 29.Kxb2 Rb8+

Black has R+P for N. The weak White Ps on the K-side with the passed Pa6 make the win relatively straightforward. Black centralizes his K to win more Ps, possibly with the aid of Rb8, while Pa6 ties down at least one of the 2 short-range Black pieces.

Oct-21-08
Premium Chessgames Member
  agb2002: Knight’s week? Initially, one wants to deviate the queen from the defense of the rook on d3. Therefore, 25... Qxb2+:

A) 26.Qxb2 Nxd3+
A.1) 27.Kb1 Nxf2 followed by ... Rxb2
A.2) 27.Kc2(d2) Rxb2+ 28.Kxd3 Rxf2
A.3) 27.Kd1 Rxb2

B) 26.Kd1 Nxd3
B.1) 27.Qxb2 trasposes to line A.13)
B.2) 27.Qxd3 Qxf2

Black ends up with at least an extra rook. The other option, 25... Nxd3+, seems to grab the exchange only. Time to post and check.

Oct-21-08
Premium Chessgames Member
  johnlspouge: I missed the finesse of Nxf2, with the Qb2 pinned to Kb1.
Oct-21-08  YetAnotherAmateur: Nothing like a good family fork in the morning. The tricky part is figuring out the mate if white doesn't take the bait.

And the theme of the week must be diverting pieces to allow knight forks.

Oct-21-08  Patriot: Black can just play 25...Nxd3+ and be up the exchange, but after looking at the forcing move 25...Qxb2+ it's easy to see that black can get more mileage out of this (important with today's gas prices). OTB this is all that's required to decide on 25...Qxb2+. But you must at least calculate what happens if white takes the queen since that leaves black down a queen for a pawn at that point. So... 25...Qxb2+ 26.Qxb2 Nxd3+ 27.Kb1 Rxb2+ 28.Rxb2 Nxb2 29.Kxb2 wins the exchange plus a pawn. And if 25...Qxb2+ Kd1 26.Qa1+ Kd2 27.Rb2+ is clearly worse for white. Given that information, Qxb2+ can be played. Hopefully later I would've noticed the 27...Nxf2 line wins even more material.
Oct-21-08  JG27Pyth: Good puzzle, but really quite difficult for Tuesday... 1/8 credit for me... saw Qxb2 but somehow convinced myself that continuing 26...Rxb2? was good ... it isn't. This mistake ultimately stems from not having seen earlier when looking at the straightforward winning line that the cross-pin on the Queen lets black win a full-rook after 27.Kb1 Nxf2
Oct-21-08
Premium Chessgames Member
  kevin86: The idea for a juicy check on d3 looked like a key to the position. Add to it,the opportunity to involve the queen in the check makes the combination possible.

...and it is forced. If 26 ♔d1 ♕a1+ 27 ♔d2 (or c2) ♖b2+ skewers the queen.

Oct-21-08  TheaN: <kevin86: ...and it is forced. If 26 Kd1 Qa1+ 27 Kd2 (or c2) Rb2+ skewers the queen.>

It is actually mate: 27.Kd2 Rb2‡, so no Queen to take afterwards, and if 27.Ke2, 27....Nc4† 28.Kc2 and also 28....Rb2‡ 0-1 with no need for the White Queen. 27.Nb1 also leads to mate if 27....Rxb1†!

Oct-21-08  TheaN: Weekly puzzles, enjoy a competition, join my <Chess Puzzle League (CPL)>. See my profile for more details. Please join, I only got ONE ANSWER last week, and I like to continue. Also tell chess friends and family etc.
Oct-21-08
Premium Chessgames Member
  TheTamale: Point of interest: this is the only game on record with Black winning while playing the Pirc.
Oct-21-08  Hans Wiemerink: This game shows the power of a attacking knight!
Oct-21-08  VooDooMoves: Black wins material in one of two ways:

A) <25...Nxd3+> wins the exchange and

B) <25...Qxb2+> wins a whole rook.

B1) <26. Kc1 Nxd3 27. Qxb2> 27. Qxd3 Qxf2 <27...Nxb2>

B2) <26.Qxb2 Nxd3+ 27. Kb1 Nxf2!> Possible because the [Q] is pinned to the [K]

Guess when you find a move that wins you can afford to look deeper into the position and find more.

Oct-21-08  Kasputin: Material is even. I noticed the potential for black to play ...Nxd3 but also noticed that it makes more sense to play this move first:

25 ...Qxb2+

Now white can either take the queen or move the king.

A) If white moves the king 26. Kd1, then black can play 26 ...Nxd3. The move 23 ...Nxd3 does a couple of things. It attacks the rook on f2 and it defends the queen at b2 (e.g., if white now takes the queen, then black can retake and come out ahead in material). But 26 ...Nd3 does something else as well. Now it is not so easy to respond 27. Qxd3 (i.e., this would have been the best response if black had played ...Nxd3 a move earlier). If white take the knight, then black can play 27 ...Qxf2. Also if white does not take the knight, then white is simply down a rook plus a pawn. For example, if white moves the f2 rook (which afterall is now being attacked by the black knight), then black can simply trade queens and black remains up a whole rook plus a pawn.

B) After 25 ...Qxb2+ if white takes the queen with 26. Qxb2, then once again black can follow up with 26 ...Nxd3+.

Now if white moves the king over to d1, then black can simply take the queen (perhaps recapturing with the rook is most straightforward) and black ends up a rook plus a pawn ahead in terms of material. If the white king moves to c2, then 27 ...Rxb2 and after white takes the d3 knight, then black will win the f2 rook. Finally, if white plays 27. Kb1, then black can play ...Nxf2. The white queen is pinned to the king and can't recapture. Whatever white does, white will end up losing the queen for a rook. The net result, again, is that white is down a rook and a pawn.

Oct-21-08
Premium Chessgames Member
  patzer2: For today's easy Tuesday puzzle, Black initiates a Knight Fork combination with 25...Qxb2+!
Oct-21-08  Alphastar: How does I win exchange
Oct-21-08  gazzawhite: <gtgloner> 25...Qxb2+ 26. Qxb2 Rxb2 might win the exchange, but white can keep one of his rooks by playing 27. Rdd2 or 27. Rff3, and so can still frustrate Black for a bit longer.
Oct-21-08  black knight c6: A more interesting point to me then the 20 or so explanations of the puzzle move (do we need that many....)

Can anyone explain the exact reasoning behind a move like 13. ... Bxe2 ?

This is the sort of move I am most interested in.

Oct-21-08
Premium Chessgames Member
  DarthStapler: Got it easily
Oct-21-08  Dr. J: <black knight c6: Can anyone explain the exact reasoning behind a move like 13. ... Bxe2? This is the sort of move I am most interested in.>

The idea is to gain control of the square e5 for a black Knight, which, as you can see, then dominates the game. The white Knight can contest this square, the white-square Bishop cannot. In relation to this, (a) note how important the exchange of black-square Bishops is to this plan. White should have avoided this exchange; and (b) with the White pawns fixed on e4 and e5, note how useless White's white-square Bishop is, particularly after the exchange of the other Bishop.

There are any number of classic games available on this site illustrating this point.

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