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Krishnan Sasikiran vs Alexander Areshchenko
Aeroflot Open (2005), Moscow RUS, rd 2, Feb-16
Gruenfeld Defense: Exchange Variation (D85)  ·  0-1



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sac: 27...Rxe4+ PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Feb-19-05  Albertan: What if Sasikiran had tried 31.d7 instead? Then if something like 31...Be6 32.Ba3 Ra8 33.Be7 Bxd7!? 34. Nxd7 Kf7 35.Nb6 Rb8 36.Nd5 could Sasikiran have survived?
Feb-19-05  Albertan: 35.Nb6? looks like an error. Maybe 35.Be7 was worth a try ie.35...Kf7 36.Nb6 Rb8 37.Bc5
Feb-19-05  Albertan: What if Sasikiran had played 24.Rxc1 instead of 24.Bxc1 .. ? Then we might have saw 24.Rxc1 Rxc1 25.Bxc1 Nc4 26.Bxc4 bxc4 27.Ne5 Bb5 28.Bd2 c3!? 29.Bcx3 Rc8 30.Bd2 Rc2 31.Ke3 Rxa3 and White would have compensation for the pawn in the form of his two dangerous passed pawms.
Feb-07-17  lost in space: Saw the sequence

27...Rxe4 28. Kxe4 Bf5+ 29. Kd4 Bxb1

leading to an endgame with a material plus (one exchange) for Black. I was sultan to be able to handle the passed white d pawn but I havenít "seen" exactly how

Feb-07-17  ChessHigherCat: I found the solution but it seems like he just lucked into that combination (typical blitz tactics)

<Albertan: What if Sasikiran had played 24.Rxc1 instead of 24.Bxc1 .. ?> Black would play 24...Bxc1, not Rxc1.

My question is why white didn't play 23. Rxc8?

Feb-07-17  stst: Looks like the most direct will be a R-sac and get the White R back in two moves: 27..........Rxe4+
28.KxR Bf5+
29.Ke3/d4 BxR with advantage.
Premium Chessgames Member
  agb2002: Black has a rook for a knight and a pawn.

White threatens Nxd7 and Nxc4.

The white knight and rook are defenseless and the bishop can attack along the b1-f5 diagonal. These details suggest 27... Rxe4+ 28.Kxe4 (else 28... Rxe5 - + [R]) 28... Bf5+ followed by 29... Bxb1 - + [R vs N].

The d-pawn could be a problem but Black seems to have enough resources to win the endgame. For example, 29.Kd4 Bxb1 30.a3 Rf1 31.Bg5 Rd1+ 32.Kc5 Be4 wins more material (33.d6 Rd5+ 34.Kc6 Rxe5+ etc.).

Feb-07-17  leRevenant: <lost in space: Saw the sequence 27...Rxe4 28. Kxe4 Bf5+ 29. Kd4 Bxb1>
Feb-07-17  patzer2: Today's Tuesday solution with the skewer tactic 27...Rxe4 28. Kxe4 Bf5+ 29. Kd4 Bxb1 was easy enough.

However, the follow-up was a bit more difficult.

White's game started a down hill slide with 25. Bxc4? allowing 25...Rxc4 (-0.99 @ 28 depth, Deep Fritz 13).

Instead, 25. Kg3 = (-0.19 @ 21 depth, Deep Fritz 15) holds it level.

Earlier 23. Rxc8+ Rxc8 24. Nf3 (+0.33 @ 24 depth, Deep Fritz 15) looks good for white.

Feb-07-17  saturn2: Black increases his advantage with Rxe4
Feb-07-17  AlicesKnight: 27.... Rxe4+ wins the N unless White captures 28.Kxe4. Then 28.... Bf5+ wins back the R which should be enough though the QP will need to be neutralised. Let's see ... correct, but the continuation shows how care is needed.
Feb-07-17  sfm: <Albertan: 35.Nb6? looks like an error. Maybe 35.Be7 was worth a try ie.35...Kf7 36.Nb6 Rb8 37.Bc5> Definitely! Also after 35.Be7,Ra7 36.Nf6+,Kf7 37.Bc5 it seems that White saves his extra fighter, after which the outcome seems to be an open matter.
Feb-07-17  Cheapo by the Dozen: Weird puzzle for this early in the week.

The basic idea is fine -- material is even-ish except that Black looks poised to lose the exchange, but he has a way to gain a pawn instead.

The problem is in the continuation, where White wins material after all due to his dangerous passed pawn.

So what really constitutes solving the puzzle??

Feb-07-17  morfishine: <27...Rxe4+> followed by <28...Bf5>
Feb-07-17  mel gibson: The computer agrees but I would have just moved the black Rook back to 27... R-c7

to defend my bishop.

Computer says:

27. Ke3 Rxe4+ (27. .. Rxe4+ (♖c4xe4+ ♔e3xe4 ♗d7-f5+ ♔e4-e3 ♗f5xb1 d5-d6 ♗b1xa2 d6-d7 ♗a2-e6 ♗c1-d2 ♗e6xd7 ♘e5xd7 ♖f8-e8+ ♔e3-f3 ♖e8-d8 ♘d7-f6+ ♔g8-g7 ♘f6-e4 ♖d8-d3+ ♔f3-e2 ♖d3-a3 ♔e2-d1 ♖a3-a4 ♘e4-c5 ♖a4-a2 ♔d1-c1 ♔g7-f7 ♘c5-e4 b5-b4 ♗d2xb4 ♖a2xg2) +1.95/22 61)

score + 1.95 depth 22

Feb-07-17  Sularus: got black's first three moves and consider this one solved :)
Premium Chessgames Member
  gawain: Looking at this one, the solution just had to be a skewer. It didn't take long for 27 ...Rxe4+ followed by ...Bf5+ to emerge. Is that conclusively a win? Probably, though it looks like a bit of a slog.
Premium Chessgames Member
  drollere: at white's 37, the point is Bxh6 loses the N to Rd8 and after Bf6 37. ... Kf7 forces the loss of either the B or the N.
Feb-07-17  YetAnotherAmateur: I got the initial combination: 27. ... Rxe4+ 28. Kxe4 Bf5+ 29. Kd4 (best for maintaining defense of the central pieces and lines for the white bishop) Bxb1

Stopping the d-pawn, though, presents a real challenge, because white has the right bishop. For example, 30. d6 Bf5 31. Kg7 Bg5 32. d7 and now black is forced into Bxd7 33. Nxd7 Rc2 and being left with a R+P vs N+B ending.

Feb-07-17  Marmot PFL: Not a difficult line to find, but the ending still requires good technique.
Premium Chessgames Member
  Bubo bubo: Black is already up the exchange against a pawn, but the pair of passed white pawns might become dangerous.

Black wins one of these pawns with 27...Rxe4+ 28.Kxe4 (otherwise Rxe5), and now the skewer 28...Bf5+ wins back the rook.

Feb-07-17  poachedeggs: I'm such a patzer...

What am I missing...

37.Nb6... threatens the black rook once again...

What's blacks 37th?

Feb-07-17  YouRang: Tuesday 27...?

click for larger view

Materially, white is down a R for N+P, but this is well-compensated by the connected passed pawns on the d+e files.

Looking around the board for tactical opportunities, I note that black has a light-square bishop, and white's Rb1 is on a light square. If the white king were on e4 instead of e3, then ...Bf5+ would skewer that rook.

Hence <27...Rxb4!> wins one of the hugely important passed pawns.

click for larger view

Even better, due to the K+N fork, it also forces simplifying exchanges <28.Kxe4 Bf5+ 29.Kd4 Bxb1>

click for larger view

Even so, black must play accurately to preserve the win. Specifically, <30.d6 Bxa2 31.Bh6> (attacking black's rook)

click for larger view

What does black play now?

The knee-jerk move might be 31...Rd8, but then 32.d7 Be6 33.Bg5 and black has to give back the exchange: 33...Rxd7+ 34.Nxd7 Bxd7 35.Bd2!

click for larger view

Despite the 2-pawn advantage, the white bishop has stopped the queenside pawns, and given white's centralized K and opposite colored bishops, this is probably a draw.


Black found the best move: <31...Ra8!>, and now the continuation leads to a very different ending: <32.d7 Be6 33.Bg5> and black, being up the exchange, can give up the bishop for the dangerous pawn: <33...Bxd7 34.Nxd7>

click for larger view

Now black's connected q-side pawns are mobile and well-supported by the rook. Furthermore, the alignment of white's N and K threatens a N-winning pin, which is prevented only by Bg5. Black hits that B with <34...h6!>

click for larger view

The attacked bishop needs to guard d8, but Bh4 is met by ...g5 and Bf6 or Be7 is met by Kf7.

White tried to maneuver out of the pin with a counter-attack: <35.Nb6 Rb8> but now two pieces are under attack. White attacks the R again by going back to d7: <36.Nd7>, but this is answered by <37...Rc8!>

click for larger view

White is still facing the loss of the bishop, or (if it moves to safety) the loss of the knight (via ...Rd8 pin). Attacking the R again (via 37.Nb6) just loses to Rc6.

In any case, black will be up the exchange with two connected passed pawns on a+b, and it's over.

Feb-07-17  poachedeggs: I'm such a patzer...

What am I missing...

37.Nb6... threatens the black rook once again...

What's blacks 37th?

Feb-07-17  poachedeggs: Never mind..,
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