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Sethuraman P Sethuraman vs Yu Yangyi
13th Asian Continental-ch Open (2014), Sharjah, rd 6, Apr-22
Sicilian Defense: Kan. Modern Variation (B42)  ·  0-1

ANALYSIS [x]

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Kibitzer's Corner
Apr-26-15
Premium Chessgames Member
  Penguincw: Hehe, never been this early for a POTD.

Anyway, I just guessed 23...Nxg3 24.hxg3 e4.

Looking forward to Monday tomorrow!

Apr-26-15
Premium Chessgames Member
  sjunto: I got it! e4.
Apr-26-15
Premium Chessgames Member
  al wazir: Black is a ♙ up. The first move, 23...e4, is easy to find. The continuation is a little harder; it's necessary to get the move order right. (I didn't.) But when the dust settles, all that has happened is that black has won a second ♙, or to be more precise, has gotten rid of his weak e5 ♙ and picked up two of white's.
Apr-26-15  M.Hassan: "Insane"
Black to play 23...?
Black is a pawn up

23............e4
Opening up the diagonal b8h2 for Queen access towards King's camp

24.Nxe4 Nxe4
25.Bxe4 Nxg3!
26.hxg3 Qxg3+
27.Qg2 Qxg2+
28.Kxg2 Bxe4
Black is now two pawns up and game may continue:

29.Be3 b5
30.cxb5 Rd3
31.Rce1 Rxa3
32.Bc5 Bd5
33.bxa6 Rxa6
Time to review game

Apr-26-15  Cheapo by the Dozen: I'm starting out stumped, as is expected on a Sunday. My early thoughts are:

Black is ahead a pawn, which is isolated, doubled, passed, hanging, and in the center. The obvious idea is . 22 ... e4
23 Ng5/Ne1 e3
24 Bxe3 Nxg3
24 hxg3 Qxg3+

But White has two alternatives at Move 24 that defend g3, both of which are likely better than this line. So if this idea basically works, 23 ... Nxg3 is likely the move.

In a further difficulty, the 23 Ne1 options sets up White to interpose rather effectively at g2.

I'm also not seeing how mixing in ... Rxd2 would help.

Apr-26-15  stacase: 23...Pe4 was my gut reaction, so I'm happy.
Apr-26-15  mel gibson: I saw e4 within 5 seconds - due to opening the diagonal for the Queen & the lovely Queen/King fork from the Knight.
After that it wasn't so clear.
Apr-26-15  arun.pulak: i dont understand how the mate would be achieved....although i am sure it can be achieved...and it doesnot seem forced for white....although its losing. after white resigned i see possibilities for black like 1)bishop pair play 2)pawn pushing to ward of the knight and support the black bishop....still not feeling like calculating...so again from a strategic perspective...
Apr-26-15  morfishine: Slightly different move order for me:

I had 23...e4 24.Nxe4 <24...Bxe4> followed by 25.Bxe4 Nxg3 26.hxg3 Qxg3+ 27.Qg2 Nxe4 28.Qxg3 Nxg3 and its hard to see how White avoids losing the exchange

*****

Apr-26-15  HighestUnrated: Wasn't 'Insane'as such. Off laye i am finding the difficult and v diff harder to crack.
Apr-26-15
Premium Chessgames Member
  patzer2: <I just guessed 23...Nxg3 24.hxg3 e4.> So did I. It almost works on this Sunday puzzle, but it's refuted after 23... Nxg3 24. hxg3 e4 by the surprise in-between move 25. Bf4! = to .

Even so, Fritz indicates that Black appears to hold his own after a complicated struggle with 25...e5! when play might continue 26. Nxe5 Rxe5 27. Nd5 Nxd5 28. cxd5 Qg7 29. Ba2 Bd6 30. Qe3 Rf5 31. Bh6 Rxf1+ 32. Rxf1 Qc7 33. Qxe4 Bc8 34. Qe3 Bf5 35. Rc1 Qd7 36. Rc6 Qf7 37. Qxb6 Qf6 38. Bc4 g5 39. Qf2 Kf7 40. g4 Qxh6 41. Bf1 Qf6 42. gxf5 h5 43. Rxa6 h4 44. a4 Qe5 45. Rc6 Kf8 = (.009 @ 22 depth, Deep Fritz 14).

Much better of course is the game continuation which wins a piece after 23...e4!! .

Apr-26-15  Ratt Boy: Sorry, what's wrong with 27.♔h1? Keeps the White ♕ protecting the ♗e4. I can't find anything better for Black than a perp. What am I missing?
Apr-26-15  Modulo: My idea would be 27. ... Qh3+ 28. Kg1 (what else?) Qg4+, which wins the Be4 anyhow. It is very possible this is not the best line, though.
Apr-26-15  dfcx: <Ratt Boy: Sorry, what's wrong with 27.♔h1?> 27. Kh1 Qh3+ 28. Kg1 Qg4+ 29. Kh1 Bxe4


click for larger view

Black still has the queen with better positions.

Apr-26-15
Premium Chessgames Member
  thegoodanarchist: It's never too late to resign - Black should have played on.
Apr-26-15
Premium Chessgames Member
  chrisowen: Debriefs ive spark an d3 baby gone at king's am pave fold face pin as head i g1 an net ever am c7 at g3 eyes h5 an g3 am d3 man xray arrive,

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Apr-26-15
Premium Chessgames Member
  agb2002: Black is one pawn ahead.

The pawn on e5 is momentarily safe (24.Nxe5 Rxd2 25.Qxd2 Qxe5; 24.Qxe5 Qxe5 25.Nxe5 Rxd2).

My first idea is 23... e4, to open the b8-h2 diagonal for the black queen:

A) 24.Nxe4 Nxe4 25.Bxe4 Nxg3 26.hxg3 Qxg3+ 27.Kh1 (27.Qg2 Qxg2+ 28.Kxg2 Bxe4 - + [B+2P vs N]) 27... Qh3+

A.1) 28.Qh2 Qxh2+ followed by 29... Bxe4 - + [B+2P vs N].

A.2) 28.Nh2 Bxe4 29.Qxe4 Rxd2 wins.

A.3) 28.Kg1 Qg4+ recovers the piece - + [B+2P vs N].

B) 24.Bf4 exf3 wins a piece (25.Bxc7 fxe2 26.Rfe1 Rd7).

C) 24.Ng5 Nxg3 25.hxg3 Qxg3+ 26.Qg2 (else 26... Qxg5 - + [3P]) 26... Qxg2+ 27.Kxg2 Rxd2+ - + [3P].

D) 24.Nh4 Nxg3 25.hxg3 Qxg3+ 26.Ng2 (26.Qg2 Qxg2+ and 27... Rxd2 as above) 26... Ng4 wins (27.Rfd1 Qh2+ 28.Kf1 Qh1#).

E) 24.Ne1 Nxg3 is similar to D.

Apr-26-15  OutOfSync: A quick question for chrisowen. Have you tried Haldol?
Apr-27-15  stst: One possible sequence, with variations for sure:
23......... Ng4 (harass the Q)
24.Qe2 Bc5+ (B-sac)
25.bxc5 Qxc5+
26.Kh1 (B intervene possible) Rxd2
27.Qxd2 Bxf3+
28.Qg2 to delay the mate.
Apr-27-15  stst: .... e4 was obvious - but after some analysis it was given up as the game shows, no significant mating net was established following that line
Apr-27-15
Premium Chessgames Member
  patzer2: Here's a look at yesterday's Sunday solution with Deep Fritz 14:

<23...e4!!> This solves the Sunday puzzle with a deflection that enables Black to safely sacrifice a Knight for two pawns and then win a piece back with a won position.

The immediate 23...Nxg3? only leads to equality, as explained in my post above.

<24. Nxe4> This is the logical human reply, but there are at least two other reasonable alternatives.

If 24. Ne1, then Black wins after 24...e3 25. Bxe3 (25. Qxe3 Qd6 26. Bd3 Ng4 27. Qe2 Qd4+ ) 25... Nxg3 26. hxg3 Qxg3+ 27. Ng2 Bxg2 28. Qe1 Qh3! 29. Rxf6 Be7 30. Be4 Bxe4 31. Nxe4 Qg4+ 32. Qg3 Qxg3+ 33. Nxg3 Bxf6 (-3.01 @ 20 depth).

If 24. Nh4, then Black wins with 24...Nxg3 25. hxg3 Rxd2 26. Qxd2 Qxg3+ 27. Qg2 Qxh4 (-3.12 @ 20 depth).

<24... Nxe4 25. Bxe4 Nxg3> Now the sham sacrifice works, as Black wins back the piece, two pawns up, after <26. hxg3 Qxg3+ 27. Qg2> (27. Kh1 Qh3+ 28. Kg1 Qg4+ 29. Kf2 Bxe4 (-4.80 @ 20 depth) <27... Qxg2+ 28. Kxg2 Bxe4>

White's weak, two-pawn deficit, position is worse than it looks, as shown by the continuation <29. Be3 Rd3 30. Bxb6 Rxa3>

This wins, but even stronger for black is 30... g5! 31. Kg3 Bd6+ 32. Kg4 (32. Kg2 g4 ) 32... Bxf3+ 33. Rxf3 h5+ (-7.74 @ 20 depth).

<31. c5 Bh6 32. Rce1 Bd5 33. Rd1 Ba8 34. Rd6 Bf4 0-1> (-7.77 @ 20 depth)

White resigns the lost position in lieu of possibilities like 35. Rd7 Rf8 36. Rf2 Be3 37. Rf1 Ra2+ 38. Kg3 Bf4+ 39. Kg4 Rg2+ 40. Kh4 Rf5 41. Rd8+ Kg7 42. Rd7+ Kh6 .

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