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Jeroen Piket vs Peter Svidler
KasparovChess GP g/60 (2000), Internet, rd 3
English Opening: Anglo-Indian Defense. King's Indian Formation (A15)  ·  1-0

ANALYSIS [x]

FEN COPIED

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Given 31 times; par: 20 [what's this?]

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Kibitzer's Corner
May-14-10  achieve: VERY powerful play by <Piket> here.... This opening was played yesterday at the Max Euwe Centrum in Amsterdam in a game between Siebrecht en Schut, and both Aronian and Svidler have played this line opening before at eg Amber.

Here's a link to the LIVE games, which pits 5 promising dutch talents against eg Nigel Short and Ftacnik:

http://www.schaakbond.nl/live/tfdli...

Oct-29-15  stst: Somewhat obscured, but also quite interesting... (yesterday's more beautiful!!)

20.Rxh7 with R(d)h1 next in mind
IF (A).........KxR, 21.Qxf7 and no help to defend R(d)h1+

IF(B)...........Kf8 <tougher defense> 21.Rh1 Ne5 (no other meaningful move)
22.Rh8+ BxR
23.RxB+ Kg7
24.Qf6#

Oct-29-15  dfcx: Black has one extra pawn and is about to play Bxc3, but white has his own tricks:

20.Rxh7 and black does not have any good responses

A. 20...Bxc3?? 21.Qxf7#

B. 20...Kxh7 21.Qxf7 followed by Rh1+

C. 20...Nf8 21.Rxg7+ Kxg7 22.Ne5 Rd7 23.Rh1 Kg8 24.Qh2 wins

D. 20...Rf8 21.Rdh1 followed by Qh2 wins

Oct-29-15  stst: spot the en passant thing, but somehow missed it? - yet this line appears bored... ( a longer finish)
Oct-29-15  morfishine: The ole Rook take the h-pawn trick: After <20.Rxh7> Black's position slides inexorably downhill

*****

Oct-29-15
Premium Chessgames Member
  agb2002: White has a bishop and a knight for the bishop pair and a pawn.

Black is probably considering defensive measures Nf8, Bd7-e8, etc. and attacking possibilities with Bxc3.

The open h-file and the queen touching f7 suggest 20.Rxh7:

A) 20... Kxh7 21.Qxf7 and mate soon (21... Nf6 22.gxf6 Qh5 23.Qxg7#).

B) 20... Nf8 21.Rxg7+ Kxg7 22.Qf6+ Kg8 (22... Kh7 23.Rh8+ Kg8 24.Q(R)h8#) 23.Ne5 (23.Rh1 Nh7 24.Rxh7 Kxh7 25.Qxf7+ Kh8 26.Qf6+ (26.Nh4 Qxg5+) unclear) 23... Rd7 24.Rh1 Nh7 25.Rxh7 Kxh7 26.Nxd7 Bxd7 27.Qxf7+ Kh8 28.Qxd7 Qxg5+ 29.Kc2 + - [B+N vs R] and many threats (Qxb7, Qxe6, Bxc4, etc.).

C) 20... Rf8 21.Qh4 with the double threat 22.Rxg7+ Kxg7 23.Qh6+ Kg8 24.Rh1 and 22.Rh1 followed by Rxg7+ Rh8+.

Oct-29-15
Premium Chessgames Member
  watwinc: Without an engine here - what happens after 23 Nh5?
Oct-29-15  Pseudotsuga: <watwinc: Without an engine here - what happens after 23 Nh5?> 24. Qg5 with multiple threats: Qe7, Rg1, Nh4, etc.
Oct-29-15
Premium Chessgames Member
  perfidious: A standard motif, typically seen in Sicilian middlegames.
Oct-29-15  wooden nickel: I bet Svidler was aiming for a transposition into "his" Grünfeld Defense. The rook sac on h7 can't be beat... doubling the rooks on the h-file via 20.Rdh1 looks decent, but 20... Nf8 would spoil the fun!
Oct-29-15  saturn2: I am not sure if after 20. Rxh7 there are not better defences like the one in the game and those proposed by <agb2002> 20.. f5 weakens the king side 20...Kf7 (obviously bad)
20...Nf8 gives white access to f6 and also obstructs the king from eventueally escaping 20...Rf8 obstructs the king from eventually escaping I was also thinking of playing 20 Nd5 first so that after Rxg7 black looses controll over e5.
Oct-29-15
Premium Chessgames Member
  gawain: Part score: I saw 20 Rxh7 Kxh7 21 Qxf7 followed by Rh1. But I did not anticipate the defense 20 ... f5 used in the game. Nor (without board or engine) do I see why Black resigned in the final position.
Oct-29-15  CHESSTTCAMPS: White is down a pawn (with a knight for a bishop) that is more than compensated by an open h-file to work against a castled king. White has also completed development with castling on the opposite wing, while black sits with 2 pieces on their original squares and minimal defense for f7 and h7. In short, an ideal attacking position, with an obvious sac available:

20.Rxh7! utilizes white's overwhelming king-side material advantage.

A.20... Kxh7 21.Qxf7 Nf6 (holds out longest) 22.gxf6 Rd7 23.Rh1+ Qh5 24.Rxh5+ gxh5 25.Qxh5+ Kg8 (Bh6+ 26.Ng5+ Kg8 27.Qxh6) 26.fxg7 with a big material advantage.

B.20... Bxc3 21.Qf7#

C.20... Nf8 21.Rxg7+ Kxg7 22.Qf6+ Kg8 23.Rh1 Nh7 24.Rxh7 Kxh7 25.Qxf7+ Kh8 26.e5! (threatening Nh4) Bd7 27.Nh4 Rg8 28.f4 Be8 29.Qxe6 and white's swarming pawns will prevail.

D.20... e5 21.Qh2 Nf8 22.Rxg7+ Kxg7 23.Qh6+ Kg8 24.Rh1 f6(/f5) 25.gxf6(e.p.) Rd7 26.Ng5 and black can't stop 27.Qh8#

Time for review...

Oct-29-15  CHESSTTCAMPS: Like a number of others, did not consider the game defense 20... f5.
Oct-29-15
Premium Chessgames Member
  Mating Net: Some tremendous attacking conditions for this puzzle. An open h file, Queen/Knight duo poised to strike on the King side, e&g pawns ready to assist, lack of coordination in the opponent's pieces. This is almost a sac first, ask questions later situation.
Oct-29-15
Premium Chessgames Member
  kevin86: The rook sac was good, but the second one was great!
Oct-29-15  varishnakov: I offer the king a rook to snack on. I didn't consider ...f5 as many didn't.
Oct-29-15
Premium Chessgames Member
  Jimfromprovidence: I found the first puzzle move but I also did not expect the game line 20...f5.

It looks like black messed up the move before the puzzle when 19...Bxc3 was playable with the threat of 20...Qxb2#


click for larger view

After 20 bxc3 than 20...Qa5 looks good with the threat of 21...Qxc3+.


click for larger view

Oct-29-15  starry2013: I settled with this, when playing the computer

Rxh7 b5
Rxg7+ Kxg7
Ne5 Rf8
Nxd7 Bxd7
Qf6+ Kg8
Rh1 Qxc3+
bxc3 Bc6
Rh8#

Trying to view the solution mentally I thought the rook sac was the way through, moving the other rook across. If the king had taken I could simply have moved my queen in to cover squares from f7 and a checkmate with my rook.

But then I realised if the King didn't take the rook it wouldn't be so easy. Maybe the king could run and the knight could block. Then when played against the computer it didn't even move the king, which had me worried. So I soon decided for a second sac. Luckily as well the computer's b5 move enabled me to get exchange that black knight, otherwise I expect I am still stuggling to finish.

Oct-29-15  Dr. J: There are more defenses possible, some not even considered by <agb>(!) that win material, so have to be refuted as part of a puzzle solution, but I doubt that Piket bothered OTB, probably relying on an assessment that White's attack is overwhelming. For instance:

20 Rxh7 e5 21 Qh4 Nf8 trapping the Rook, but now 22 Rxg7+ Kxg7 23 Rh1 f6 (or ...f5) 24 Qh8+ Kf7 25 Qxf6+ Ke8 26 Qe7#

Oct-29-15  rgr459: <c3 coccyx pins it edict hives> couldn't have said it better myself
Oct-29-15
Premium Chessgames Member
  Penguincw: I think the pawn on c4 is hanging...

Anyway, I got 20.Rxh7, but if black played 20...Kxh7, I would've incorrectly followed up with 21.Qh4+.

Oct-30-15  Moszkowski012273: 5...Nf6 looks like a horrible loss of tempo.

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