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Sunil Mokal Prathamesh vs Amro El Jawich
13th Dubai Open (2011), Dubai UAE, rd 6, Apr-16
Sicilian Defense: Najdorf. Opocensky Variation Traditional Line (B92)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 1 OF 3 ·  Later Kibitzing>
Jun-05-11
Premium Chessgames Member
  bright1: This could be a Wednesday puzzle with White to play and win on move 28.
Jun-30-11
Premium Chessgames Member
  NM JRousselle: This is not a good puzzle.

White is up the exchange for which Black has zero compensation. There are many roads that lead to Rome. Just about any move that does not throw away material should win this one.

Qd8 is probably the speediest win, so in that regard, it could be consider best.

Jun-30-11
Premium Chessgames Member
  Phony Benoni:


click for larger view

<28.?>

First thing I see is the ♗e5 aiming at g7. Can the queen get over there? Yes, but the bishop is under attack, so that's not going to work.

Come to think of it, the queen is under attack too. Is this one of those <28.Qxd8 Bxd8 29.Rxd8> positions? Material almost even, and White has the threat of 30.Bd6 winning the knight for 2R+B vs. queen.

Black can't unpin the knight in time; can the bishop be kept on d6? There's no counterattack on the rook, but <29...Qe6> is a counter pin and might gain time.

But now Black's queen is vulnerable to a discovered attack. 30.Bc3, to follow with 31.Ree8, is possible if White can avoid back rank problems. Anything more forcing?

We can set up a check with <30.Rxf8+ Kxf8 31.Bxg7+> (not 31.Bd6+, of course) <31...Kxg7 32.Rxe6 fxe6>. Let me check my Excel spreadsheet ... that's an extra pawn for White in a K+P ending.

Not much, but I see White went in for that more forcing line. Wonder if 30.Bc3 was better.

Jun-30-11  lost in space: Saw it quickly:

28. Qxd8 Bxd8 29. Rxd8

Now th treat is to play Bd6 (the bishop is protected by our Rook on d8; this was the thing to see for me). If White can play Bd6 he will win Nf8 -> enough to win

29...Qe6 (pinning Be5 on Re1; if Be5 moves -> mate Qxe1)

30. Rxd8+ Kxd8 31. Bxg7+ (witch check is key)

and Black will lose his Queen for the rook.

The remaining position (only pawn remaining) is won for White as he has one pawn more.

Jun-30-11
Premium Chessgames Member
  johnlspouge: Thursday (Medium)

S Prathamesh vs A El Jawich, 2011 (28.?)

White to play and win.

Material: Up R for N. The Black Kg8 has one legal move, h8, which Be5 x-rays through the Black Pg7. Black has a potentially weak back rank, because White has a battery Qd2 and Rd1 facing Rd8. The weakness suggests exchanging Q for R+B.

Candidates (22.): Qxd8

22.Qxd8 Bxd8 [else, drop a R]

23.Rxd8 (threatening 24.Bd6 25.Rxf8#)

23Qe6 [h6 only prevents mate, not the loss of Nf8]

This move is the only gain of tempo available to defend Nf8, but is inadequate.

24.Bc3 (threatening 25.Ree8) wins Nf8, because Bc3-e1 defends against a back-rank mate.

A preferable win, however, is probably

24.Rxf8+ Kxf8 25.Bxg7+ Kxg7 [else, down an extra B]

26.Rxe6 fxe6, with an easily won K+P endgame.

Jun-30-11  dzechiel: White to move (28?). White is up an exchange. "Medium."

It would seem that any move that doesn't lose should be good enough to win eventually. Let's see if there's some way to shorten the game.

At first glance I wanted to try 28 Qg5 (threatening mate and threatening 29 Rxd8 Bxd8 30 Qxd8), but I think that black can simply play 28...Ne6 and cover all his bases.

The only other idea I see is picking up the rook and both minor pieces for the queen, leaving white with two rooks and a bishop against a lone queen, surely a winning advantage.

White starts with

28 Qxd8 Bxd8 29 Rxd8

and now the simple threat is 30 Bd6 and 31 Bxf8. I don't think black can stop this.

Time to check.

=====

OK, after 29...Qe6 white could have also played 30 Bc3 Qxc4 31 Ree8 also winning. But getting black to resign on move 33 was probably the most expedient.

Jun-30-11
Premium Chessgames Member
  An Englishman: Good Evening: I saw the simplification into an easily K & P ending (wasn't that a favorite Capablanca technique?), but figured there had to be something better than that.
Jun-30-11  rhickma4: The best I could come up with is:
28.Qxd8 Bxd8 29.Rxd8, with the threat of Bd6 winning the N. Black seems to have no defence to this simple approach (29...Qe6 is met with 30.Bc3 and 31.Ree8.)
Jun-30-11  LIFE Master AJ: I got the first move, 28.Qxd8. But my followup was much different. (I wasn't sure, but White could try b3 and Kf1 and Bd6; winning outright.)

[I saw the simplification line, but mentally mis-counted, thinking things were almost equal.]

Jun-30-11  LIFE Master AJ: Apparently, White comes out a Pawn ahead.
Jun-30-11  LIFE Master AJ: In other words, I thought that if 29...Qe6; White had a better win than in the game. (IDEA: Try to win that pinned Knight on f8.)
Jun-30-11  LIFE Master AJ: Too many questions! Can't find this game in the on-line database, so I will download it and "Fritz it."
Jun-30-11  LIFE Master AJ: I was right, White missed a good move. (30.Bc3!)

I did not think that 29...Qe6; was possible ...

I was looking at 29...Qa4 as my main line.

Jun-30-11  LIFE Master AJ: Took me around 10 minutes to find the line, 29...Qa4; 30.b3!

I had concluded that White wins easily ...

Jun-30-11  M.Hassan: "Medium" White to play 28.?
White is ahead in materials. He has a Rook for a Knight. he can run to grab more material:

28.Qxd8 Bxd8
29.Rxd8 Qe6
30.Bc3 Qg6
Queen moves to g6 in anticipation that Rook e1 intends to leave rank 1 and Queen can check White king by one move: g6 to b1 but from e6 to rank 1 is 3 moves:...Qxc4 then to a2 and then to rank 1

31.Ree8 Qb1+
32.Be1 g6
33.Rxf8+

By now, White has captured a Rook+Bishop+Knight and has given a Queen

33........Kg7
34.Rg8+ Kf6
35.Rge8 Qxb2
36.Rd5 Qa3
37.Re3 Qc1
38.g4
By last move White prepares to free his King out of pin and activate his Bishop which will add to attacking force of the Rooks. I beleive White wins. Time to check
-----------
Impressive!. By a discovered check White gets the Queen, distorts pawn structure of Black and obviously wins

Jun-30-11  LIFE Master AJ: I spent about 30 minutes with Fritz and Rybka, (whole game); there is no doubt that 30.Bc3! was much superior to the game line.
Jun-30-11  rilkefan: Very easy Thursday, though I didn't consider Rxf8, a move I would be loath to play even though it obviously makes complete sense.
Jun-30-11  Terry McCracken: <LIFE Master AJ: I spent about 30 minutes with Fritz and Rybka, (whole game); there is no doubt that 30.Bc3! was much superior to the game line.>

Yes I saw that line but it's not objectively best if simplification shows a direct and easy win

It does. For a computer 30. Bc3 is the only move but not for a human. I doubt he missed it.

Jun-30-11  hedgeh0g: Very easy puzzle. Black has no good defence to a simple back-rank combination: Qxd8 Bxd8 Rxd8 Qe6 (the best try, to prevent Bd6) and now, either Rxf8+ Kxf8 Bxg7+ leaves White with a trivially won king and pawn ending, but if White is a real butcher, Bc3! is arguably even more convincing, with Ree8 to follow.
Jun-30-11  jheiner: 28. White to play.
S Prathamesh vs A El Jawich, 2011

Material: White is up a R for N.
The White Q is threatened by the R.
Looks like there are reasonable back rank threats, pins and removal of the guard motives.

28.Qg5 (threatening Qxg7#.)

If 28...g6 29.Rxd8 Bxd8 30.Qxd8 (wins a B)
If 28...Qg6 (or Qh6) 29.Qxg6 fxg6 30.Bxc7 (wins a B)

If 28...Ne6 (attempting to cover all weaknesses)
29.Bxc7

If 29...Qxc7 30.Qxd8+ (If Nxd8 31.Re8#) Qxd8 31.Rxd8+ Nxd8 32.Re8# If 29...Nxc7 30.Qxd8+ Ne8 31.Qxe8+ Qxd8 32.Re8#
If 29...Nxg5 30.Rxd8+ 31.Qe8 Rxd8#

I expect Black resigned early. Time to check.

Hmmm, looks like I missed the counterplay somewhere.

Jun-30-11  jheiner: Aargh! 28.Qg5? f6 is enough.
Jun-30-11  gofer: White is already an exchange up, which in most end games should be enough to give white the expectation of victory, so humble moves like Qc3 are probably enough for victory. But I suppose we are meant to find a way to crush black in a quick sequence. So we can start looking at a simple back rank trap.

<28 Qxd8 Bxd8>
<29 Rxd8 ...>


click for larger view

White has won R & B for the queen and has pinned Nf8! So in effect has won R+B+N for the queen, which seems quite an interesting trade that leaves R+R+B v Q. Now there is no way of defending the knight, so black must try to extracate its king from a back rank mate and then play on from there.

What is also quickly evident is that the queen cannot come to help. White's pieces are well placed to give the queen very few defensive options and just as few attacking ones;

29 ... Qa4/Qg6/Qh6/f6/g6/h6 30 Bd6 winning the knight

So the knight is lost but what is black's best option?

<29 ... Qe6>
<30 Bc3! Qxc4>
<31 R1e8 h6>
<32 Rxf8+ Kh7>
<33 Rd7 ...>

Now the line above is probably not the game continuation, as there are so many. But everything looks okay for white and moves like g3 will secure white's future and doubling the rooks on the seventh will end black's chances of survival. Time to check.

Jun-30-11  gofer: Interesting. I saw the game continuation, but didn't think it was a good option. The trade off of R+R+B for Q+p seemed a little "rough", but seeing the final position it is clear that white cannot defend the e and h pawns without allowing the white king to get behind the black a, b and c pawns. So it is clearly a win.

<Once> What does Fritz say to the trade off?

Jun-30-11
Premium Chessgames Member
  agb2002: White has a rook for a knight.

Black threatens 28... Rxd2.

The first move that comes to mind is 28.Qg5 with the double threat 29.Qxg7# and 29.Rxd8 but 28... f6 seems to turn the tables. Therefore, 28.Qxd8 Bxd8 29.Rxd8, making the most of the pin and Black's weak back rank:

A) 29... f6 30.Bd6 Kf7 31.Rxf8+ Kg6 32.Bg3 + - [2R+B vs Q].

B) 29... g6 30.Bd6 Kg7 31.Bxf8+ Kf6 (31... Kg(h)8 32.Bh6#) 32.Rd6+ + - [R+B].

C) 29... Qa4 30.Bd6 h6 31.Rxf8+ Kh7 32.Rxf7 Qxc4 33.Rfe7 + - [2R+B vs Q].

D) 29... Qe6 30.Rxf8+ (30.Re4 Qe7) Kxf8 31.Bxg7+ Kxg7 32.Rxe6 fxe6 33.f4 Kf6 34.Kf2 Kf5 35.Kf3 h5 36.g3 + - [P], White will create a passed pawn on the king side which will divert the black king from the defense of the queen side pawns.

Jun-30-11  Passionate PatZER: not hard,... the back rank is unguarded after Qd8: and the other Rook comes down,.. the Qe6 move is desperation
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