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Viacheslav Kulakov vs Daniel Ludwig
Open 18-wycc (2008), Vung Tau city, rd 9, Oct-28
Queen's Indian Defense: Spassky System (E14)  ·  0-1

ANALYSIS [x]

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Kibitzer's Corner
Oct-17-18  Fish55: It took me a while to see that 37...Bxf3 works because the target is the rook on g2, not the bishop on b5. 39.Kf2, Rd2+ or 39.Kg3, Rg8+.
Oct-17-18  nalinw: It may be a lot more than a Rook - White probably has to give up a lot of material to avoid mate.
Oct-17-18
Premium Chessgames Member
  al wazir: I found the combination, but my move order was wrong: 37...Qb7 38. Be2 (forced) Bxef3 39. Bxf3 Rxd3+ 40. Kxd3 Qxf3+ 41. Kc4 Qc6+ (or 41...Rc6+, or 41...Qxg2) 42. Kb3 Qxg2. Now white can play 43. Rb1, 43. Rc1, or 43. Qxa7, and black can't quite finish the attack.
Oct-17-18  Mayankk: Found it. Once you see the two defenceless Rooks on the long diagonal, and the Right Bishop on that diagonal, you always want to skewer them in some way. A Queen can of course be a Bishop, and a bit more. So you sacrifice the Bishop, get the Queen on the same diagonal and suddenly White finds itself in a resignable position.

Funnily I didnít notice the attack on b5 Bishop after Qb7, since I was focused on the two Rooks... not that it matters.

Oct-17-18
Premium Chessgames Member
  agb2002: Black is one pawn down.

The position of the white king and rooks suggests 37... Bxf3 38.Kxf3 (else wins an exchange at least) 38... Qb7+:

A) 39.Kf2 Rd2+

A.1) 40.Be2 Rxe2+ 41.Kxe2 (else 41... Qxg2#) 41... Qxg2+ wins a rook (42.Kd3 Qxh1 -42... Qd2+ 43.Kc4 Rc6+ is probably even stronger- 43.Qxa7 Qc6).

A.2) 40.Ke1 Qxg2 wins decisive material (41.Rf1 Rd1+ 42.Kxd1 Qd2#).

A.3) 40.Kf1 Qxg2+ 41.Ke1 Qf2#.

A.4) 40.Kg1(3) Qxg2#.

A.5) 40.Ke3 Qe4#.

B) 39.Kg3 Rg8+ 40.Kf2 (else 40... Qxg2#) 40... Rxg2+

B.1) 41.Ke1

B.2) 41.Ke3 Qe4#.

B.3) 41.Kf1 Qf3+ 42.Ke1 Qf2+ 43.Kd1 Qd2#.

C) 39.Ke2 Qxg2+ and mate soon.

D) 39.Ke3 Qe4+ 40.Kf2 Rd2+ and mate in two.

Oct-17-18  saturn2: I saw after 38..Qb7+
the white king has two reasonable squares f2 und g3 and on both he will be exposed to a decidung rook check Rd2 or Rg8.
Oct-17-18
Premium Chessgames Member
  patzer2: Today's Wednesday puzzle wins after the game continuation 37...Bxf3! 38. Kxf3 Qb7+ -+ (mate-in-20, Stockfish 9 @ 42 ply) or my pick 37...Qb7 -+ (-7.49 @ 35 ply, Stockfish 9), but the position (37...?) hides a few pitfalls Black needs to avoid.

For starters, the tempting 37...Rdb8? is immediately refuted by 38. Rhg1 = (0.00 @ 32 ply, Stockfish 9) with a level game. If Black tries to push it too far with 37...Rdb8? 38. Rhg1 Rxb5?? (diagram below),


click for larger view

White turns the tables on Black and wins (diagram above) with 39. Qxb5! +- (+5.14 @ 32 ply, Stockfish 9) because of the threat 39. Qxb5! Rxb5? Rg8#.

The final position hides an obvious pitfall for novices to avoid. After 38...Qb2+ 39. Kf2 (diagram below),


click for larger view

beginners need to think one move ahead and not be tempted by the piece capture 39...Rxb5?? as it's met by 40. Qxd8#.

Instead, after 38...Qb2+ 39. Kf2 (diagram above), Black wins with 39...Rd2+ 40. Be2 Rxe2+ 41. Kxe2 Qxg2+ 42. Ke3 Qxh1 -+ (mate-in-12, Stockfish 9).

P.S.: So where did White go wrong? White's game took a turn for the worse with 30. g3? allowing 31. Ng6 ∓ to -+ (-1.43 @ 32 ply, Stockfish 9).

Instead, 30. Be2 = to ⩲ (+0.29 @ 34 ply, Stockfish 9), 30. Bb5 ⩲ to = (+0.25 @ 34 ply, Stockfish 9) or 30. Rg1 ⩲ to = (+0.22 @ 34 ply, Stockfish 9) give White a good position.

Oct-17-18  AlicesKnight: Found it ....
Oct-17-18
Premium Chessgames Member
  malt: Have 37...B:f3 38.K:f3 Qb7+ 39.Kf2
(39.Kg3 Rg8+ 40.Kf2 R:g2+ 41.Ke1 Qe4+ )

39...Rd2+ 40.Be2 R:e2+

Oct-17-18  TheaN: Wednesday 17 October 2018

<37....?>

Temptation day. Lots of moves that don't really bring Black anything. He forces with <37....Bxf3> which is a somewhat hidden shot. Is it, though? Black does accomplish a lot of things with this move: first of all he x-rays both rooks, he opens up the d-file and if captured detaches the White King.

In light of BxR, to which White cannot do anything else and is lost otherwise, <38.Kxf3 Qb7+>. However, here Temptation Day comes around. This move 'forks' the King and the Bishop, but the Bishop is immune as can be. After <39.Kf2 (Kg3 Rg8+ -+)> Black has to continue the King pressure with <39....Rd2+>. If White doesn't want to lose Rg2 he plays <40.Be2> and now Black has to only briefly visualize the end result before time control, to finish with <40....Rxe2+! 41.Kxe2 Qxg2+ -+>.

Oct-17-18  TheaN: Interesting also to realize that White's choices after Qxg2+ are grim. Of course, going to the first rank allows Black to take on h1 with tempo and will like end in Black promoting c3 very soon. Going to e3 puts the King away from c3 and thus gives Black time to protect him forcing White's hand.

The best variation arises if White attempts to go after Pc3, as Black can simply ignores the Rook then. <42.Kd3 Qe4+!> -#16 (Qxh1 too but harder) courtesy of SF9. Pc3 done his job, and will be in the way in variations after Qd2+.

<43.Kxc3 Rc6+ 44.Qc5 (Kd2 Rc2+ 45.Kd1 Qe2#; Kb2 Rc2+ 45.Kb1 Re2+ 46.Kc1 Qxh1#) Rxc5+ 45.bxc5 Qxh1 -#13>

Oct-17-18  Captain Hindsight: The long diagonal strikes again.

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