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Ivan Denisov vs Roman Lvovich Skomorokhin
Chigorin Memorial Open (2009), St Petersburg RUS, rd 8, Oct-23
Philidor Defense: General (C41)  ·  0-1
ANALYSIS [x]

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sac: 37...Rxc2 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
Oct-08-19  Cheapo by the Dozen: 37 ... Rxc2, and the rook is poisoned, as in the game line. And by the way, Black has gained a pawn, his rook no longer hangs, both White's bishops are en prise, and the White king doens't look too healthy either.

I originally thought the answer would be 37 ... exd3, but that seems to fail to a couple of different defenses.

Oct-08-19
Premium Chessgames Member
  agb2002: Black has a bishop and a knight for the bishop pair.

White threatens Qxc8.

Black can expose the white king with 37... Rxc2 (37... exd3 38.Qxc8 dxc2+ 39.Kxc2 Qd2+ 40.Kb1 Qd3+ 41.Ka2 Qxf1 42.Qh8#):

A) 38.Kxc2 Qxd3+ 39.Kc1 Bd2+ 40.Kd1 Be3+ 41.Ke1 Qd2#.

B) 38.Rf7+ Nxf7 39.Qxe4 Qxe4 40.Bxe4 Rxb2, etc.

C) 38.Qxe4 Nxe4 39.Kxc2 Nd2 wins.

Oct-08-19  saturn2: 37...Rxc2 38. Kxc2 Qxd3+ 39. Kc1 Qxf1+ is a piece more.
Oct-08-19  Walter Glattke: 37.-exd3 38.Qxc8 dxc2+ 39.Kxc2 Qd2+ 40.Kb1 Qd3+ 41.Ka2 Qxf1 42.Qc7+ Qf7 -+
Oct-08-19
Premium Chessgames Member
  perfessor: 37...Rxc2 38. Kxc2 Qxd3+ 39. Kc1 Bd2+ 40. Kd1 Be3+ 41. Ke1 Qd2 mate.
Oct-08-19  charlesdecharemboul: You are all great players. I'm not. So, here is a line till the mate. 40. Kd1 Bc3+ 41. Kc1 Qxf1+ 42. Kc2 Qd3+ 43. Kc1 Qd2+ 44. Kb1 Qxb2#.
Oct-08-19  Cheapo by the Dozen: By the way, the position isn't all that different from one in which Qxg5 would be devastatingly successful for White. But tempo even aside, Black's queen defends against a lot of that from her current square.
Oct-08-19
Premium Chessgames Member
  malt: Have 37...R:c2 38.Rf7+

(38.K:c2 Q:d3+ 39.Kc1 Bd2+ 40.Kd1 Bf4+ 41.Ke1 Qd2# )

38...N:f7 39.Q:e4 Q:e4 40.B:e4 R:b2 41.Bc2 Ra2 42.Kc1 Bc3

Oct-08-19  Damenlaeuferbauer: Because his rook was attacked, after long pondering my old Russian friend Roman (who has the same patronym as the immortal Victor Kortchnoi) finally found 37.-,Rxc2! 38.Kxc2,Qxc3+ 39.Kc1,Bd2+ 40.Kd1,Be3+ 41.Ke1,Qd2#. By the way, today is the 27th anniversary of the death of the great former German chancellor Willy "Whisky" Brandt (1969-1974), who is the last German honoured with nobel peace prize (1971).
Oct-08-19  TheaN: After 37....Rxc2 Black has..... mate in 26? Impressive of SF9 on 27 ply :>.

It's clear however that 38.Kxc2 Qxd3+ 39.Kc1 Bd2+ 40.Kd1 Be3+ 41.Ke1 Qd2# fails, and White has no proper way to stress the queenside pieces: in fact, White has no real way to stop Qxd3.

If White does try, 38.Rf3, Black should play the 'calm' Nxf3 -+ to keep all threats active, and after 38.Qxe4 first safeguard the en prise piece with 38....Rd2+ with 39....Nxe4 -+. There's probably better in both lines, but it's more than enough.

Oct-08-19  TheaN: <Side puzzle>: a practical try in Blitz would have been 38.Qxe4?! on account of indeed 38....Rd2+ 39.Kc1 Nxe4, but now 40.Bc4!


click for larger view

Black has to be careful here as now the kingside threats build up, even a queen up. Black keeps a solid advantage after 40....Rc2+!? 41.Kxc2 Qd2+ 42.Kb1 Nxc3+ 43.Bxc3 Bxc3 44.Rf7+ Bg7 -+, but what's Black's best move on move 40?

Oct-08-19  zb2cr: Taking advantage of the pin, 37. ... Rxc2. If 38. Kxc2, Qxd3+; 39. Kc1, Bd2+; 40. Kd1, Be3+; 41. Ke1, Qd2#. (<charlesdecharemboul>'s line also works.)

Either of White's tries, 38. Rf3 or 38. Qxe4, fail as the Knight simply captures and leaves White with the same problem set as before.

Oct-08-19
Premium Chessgames Member
  gawain: As a puzzle, this was very easy because there is really nothing else to try. The only trick is to see exactly how 39...Bd2+ wraps things up
Oct-08-19
Premium Chessgames Member
  patzer2: Today's Tuesday puzzle is a good example of simultaneously attacking and defending in Chess, and would be an excellent example to use for teaching a class of novice students.

Black threatens the capture of a piece with 37...exd3?, but carrying out this simple threat overlooks that White can capture Black's Bishop or Rook with great complications for Black.

If Black plays 37...exd3?, the computers say White equalizes by capturing the Bishop (i.e. 38. Qxb4! =). After 37...exd3?, capturing the Rook (i.e. 38. Qxc8?) is a mistake as Black secures a decisive yet difficult advantage after 37...exd3? 38. Qxc8? dxc2+ -+ (-5.05 @ 37 ply, Stockfish 10).

Since 37...exd3? fails to win after 38. Qxb4 = (0.00 @ 35 ply, Stockfish 10), Black has to look for a better winning idea.

The best winning idea is the game move 37...Rxc2! -+, which forces mate-in-15 (M15 @ 45 ply, Stockfish 10).

My idea, based on the mistaken notion that I had to protect the Rook at all costs, was 37...Rc7 -+ (-10.22 @ 44 ply, Stockfish 10). Surprisingly, my 37...Rc7 -+, which was intended to protect a Rook that could easily be sacrificed for a winning advantage, is the computer's second choice among six, clear winning alternatives (i.e. 37...Rxc2! -+, 37...Rc7 -+, 37...Rd8 -+, 37...Re8 -+, 37...Rc5 -+, 37...Rc6 -+).

P.S.: White's decisive mistake was the overly aggressive 30. Rf1?, allowing 30...g6! 31. Qe2 d5! -+ (-4.12 @ 30 ply, Stockfish 10).

Instead, White should have played 30. Qe2! = (+0.15 @ 32 ply, Stockfish 10) with a level game.

Oct-08-19  paavoh: <... very easy because there is really nothing else to try...>

My thoughts exactly. But then again, it is a Tuesday puzzle.

Oct-08-19
Premium Chessgames Member
  patzer2: <TheaN:> <Side puzzle>:


click for larger view

I gave up and looked at the answer on Stockfish 10. The amusing best move is 40...Ba3! -+ (mate-in-10).

After 40...Ba3! 41. Bxa3 (diagram below),


click for larger view

Black has 41...Rc2+! 42. Kxc2 (42. Kb1 Rxc4 -+) 42...Qd2+ 43. Kb1 Nc3+ 44. Ka1 Qa2#.

After 40...Ba3! 41. Bxd5 (diagram below),


click for larger view

Black has mate-in-two with 41...Bxc2+ 42. Kb1 Nc3#.

Oct-08-19  kreugerl: I had the same line as <Walter Glattke> beginning with 38. Exd3, until white’s move 42. when Instead of 42. Qc7 ch, doesn’t white simply have Qh8 mate? Or, maybe I missed something?
Oct-08-19  JohnBoy: The hard part was 39...Bd2+. I would have snagged the R in an instant in blitz.
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