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Luke McShane vs Igor Efimov
European Team Championship (2009), Novi Sad SRB, rd 1, Oct-22
Sicilian Defense: General (B20)  ·  0-1



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Kibitzer's Corner
Oct-23-09  Marmot PFL: This is no way to beat the Sicilian, Luke.
Oct-23-09  luzhin: McShane had to play 25.Ra7 after which it's still unclear.I suspect he missed the combination beginning with 26...Rxh3+!! which wins the Queen by force.
Sep-03-14  sakredkow: It was do or die. Without 26...Rxh3+ Black's game goes south in a hurry.
Aug-28-19  bcokugras: 27. Kh2?
Aug-28-19  latebishop: Surely White is forced to take the rook as after 27.Kg1 Qe3+ 28.Rf2 Qxf2 mate.
Aug-28-19  saturn2: After 26...Ne3 comes 27 Qb1

So better 26...Rxh3+ 27. gxh3 g2+ 28. Kg1 gxf1=Q+ 29. Qxf1 Qa1.

One additional pawn and the free a and c pawns should make it.

Aug-28-19  Autoreparaturwerkbau: Simple <26.Qxc2> would have held a healthy advantage for white.

Instead white played <26.Rxf7?> which on first glance seems plausible - moving attacked rook and taking f7-pawn - but it completely disregards crucial weakness on h-file combining with dangerous c2-knight.

Premium Chessgames Member
  fredthebear: 26.QxNc2 QxRe7 and it's still a brawl.

What a fun game! Black sacrifices both rooks and gets in a royal family fork.

Premium Chessgames Member
  Dionysius1: Good that LMcS kept playing after 28...Ne3+
Premium Chessgames Member
  agb2002: White threatens Qxc2.

The position of the white king and heavy pieces leads to 26... Rxh3+ 27.gxh3 (27.Kg1 Qe3+ 28.Rf2 Qxf2#) 27... g2+:

A) 28.Kxg2 Ne3+ 29.Kg3 (say) 29... Nxd1 followed by c3 seems to win (if White plays e7 and Rf8 Black can reply with Rxf8).

B) 28.Kg1(h2) Ne3 wins decisive material.

Aug-28-19  malt: 26...R:h3+ 27.gh3

(27.Kg1 Qe3+ 28.Rf2 Q:f2# )

27...Ne3(...g2+) 28.Qe2 g2+ 29.Q:g2 N:g2

Aug-28-19  mel gibson: I saw that but it was so complicated that I couldn't be bothered working it out. Stockfish 10 says:


(26. .. Rxh3+ (♖h8xh3+ g2xh3 ♘c2-e3 ♕d1-d2 g3-g2+ ♕d2xg2 ♘e3xg2 ♔h1xg2 ♖d8-e8 ♖f1-e1 c4-c3 f4-f5 g6xf5 e6-e7 ♔c8-d7 ♖e1-e2 ♕a3-b3 ♘f3-e5+ ♔d7-d6 ♖f7-f8 ♖e8xe7 ♘e5-f7+ ♖e7xf7 ♖f8xf7 ♕b3-d1 ♖f7-e7 ♕d1xd4 ♖e7-e8 ♕d4-f4 ♖e8-a8 ♕f4-c4 ♖a8-d8+ ♔d6-c7 ♖e2-e8 ♕c4-d3 ♖d8-c8+ ♔c7-b7 ♖c8-b8+ ♔b7-c6 ♖e8-c8+ ♔c6-d7 ♖c8-d8+ ♔d7-e6 ♖b8-c8 ♔e6-e5 ♖c8-c6 ♔e5-f4 h3-h4 ♕d3-d2+ ♔g2-g1 c3-c2 ♖d8-d7 c2-c1♕+ ♖c6xc1 ♕d2xc1+ ♔g1-g2) +8.12/41 232)

score for Black +8.12 depth 41

Aug-28-19  zb2cr: After 26. ... Rxh3+; 27. gxh3, g2+; 28. Kh2 is the trickiest try for White. Black should carry through with the fork threat instead of taking the Rook. After 28. ... Ne3, White has a mate threat in 29. Qb1, but Black can now underpromote to a Knight with check and interpose with Qb3. This leaves him a Knight up.
Aug-28-19  Autoreparaturwerkbau: I ran a deep silicon search of complicated position, arisen after <25...♘xc2>. I ran stockfish10 for 4 hours, going amazing 40 plys deep.

Until 36 plys position is valued around <+1,5> in favour of white, always preferring 26.Qxc2 by far. Then at 37th ply onward it suddently drops to dead draw value <0,0> still with 26.♕xc2 but different continuation.

So, after 40 plys <26.♕xc2> is still best with <0,0>, now tightly followed with <26.exf7> valued at <-0,4>.

What <26.♕xc2> basically does (best 40 ply line: 26.♕xc2 ♕xe7 27.♕a4 fxe6 28.♖b1 ♕c7 29.♖b5 ♖h7 30.♖c5 ♕xc5 31.dxc5) is that it -- exchanges white's both rooks for black's Q+N -- after which there is a drawn position with white holding Q+N and 4P against black's 2R and 6P:

click for larger view

The newly arisen position seems tricky in lieu of white's backrank weakness and black's passed pawns but white's Q+N combo is enough to compensate that. I ran continuation silicon analysis (32 ply) starting from above picture on and it goes: 31...♖b7 32.♕c2 d4 33.♕xg6 c3 34.♕xe6+ ♔c7 35.♕e5+ ♔c6 (valued @ drawish <0,0>)

click for larger view

which leads nowhere.

Aug-28-19  whiteshark: This was easy to handle today.
Aug-28-19  Autoreparaturwerkbau: <patzer2: P.S.: So where did White go wrong? White lost the game with 26. Rxf7?, allowing today's Wednesday puzzle wolution 26...Rxh3+ -+. Instead, White should have played 26. Qxc2! Qxe7 27. Qh4! ± to +- (+1.90 @ 31 ply, Stockfish 10) for a <near winning advantage.>>

You might want to check my previous post.

Deep (40 ply Stockfish10) analysis confirms 26.Qxc2 as best line for white but actually shows it only draws at best (eval. 0,00) since values drastically retreat from ~ +1,5 to zero after 36th ply of analysis.

Premium Chessgames Member
  patzer2: For today's Wednesday puzzle solution, 26...Rxh3+! 27. gxh3 g2+! 28. Kxg2 Ne3+ is a decisive knight fork. If 28. Kg1 or 28. Kh2, Black still plays 28...Ne3 -+ which threatens both the Queen and a decisive pawn capture/promotion for an easy win.

P.S.: <Autoreparaturwerkbau> I was just about to repost with a reference to your deeper 40 ply, Stockfish 10 analysis when I noticed your post.

Still, 26.Qxc2! Qxe7 27. Qh4 with winning chances and a draw in hand is better than losing with 26. Rxf7? to 26...Rxh3+ -+.

Aug-28-19  FrogC: Easiest puzzle of the week so far.
Aug-28-19  Autoreparaturwerkbau: <<patzer2:> Still, 26.Qxc2! Qxe7 27. Qh4 with winning chances and a draw in hand is better than losing with 26. Rxf7? to 26...Rxh3+ -+.>

No doubt about that. There is about dozen lines better or much better than the game line <26♖xf7?>. Luke hasn't calculated deep enough and simply didn't see the storm coming.

Nonetheless, it presented a very neat puzzle for us.

Aug-28-19  TheaN: After <26....Rxh3 27.gxh3 ((27.Nh2 Rxh2+) 27.Kg1 Qe3+ 28.Rf2 Qxf2#)> both g2 and Ne3 achieve the same. Forcing is at least <27....g2+ 28.Kxg2> not taking leads to Ne3 with a complete collapse, though be wary of 28.Kh2?! Ne3 29.Qb1! gxf1N+! 30.Kg1 Qb3 -+. <28....Ne3+ 29.Kg3 Nxd1 30.Rxd1 c3 -+> wins.
Premium Chessgames Member
  Jimfromprovidence: Put me in with the comments of <zb2cr>.<After 26. ... Rxh3+; 27. gxh3, g2+; 28. Kh2 is the trickiest try for White>. Position is below.

click for larger view

There are a few mines to tiptoe around here.

28...Ne3 (not first 28...gxf1=N+) 29.Qb1 (threatening mate in one) 29...gxf1=N+ 30.Kg1 Qb3 (blocking mate threat) 31.Qxg6 (threatening 32 e7) Position below.

click for larger view

And there is still work to do for black.

Aug-28-19  RandomVisitor: After 24...0-0-0 Stockfish cannot improve on what <Autoreparaturwerkbau> has already posted:

click for larger view


<61/41 2:56:57 0.00 25.Rxe7 Nxc2 26.Qxc2 Qxe7 27.Qa4 fxe6 28.Rb1 Qc7 29.Rb5 Rh7 30.Rc5 Qxc5 31.dxc5 Rb7 32.Qc2 d4 33.Qxg6 c3 34.Qxe6+> Kc7 35.Qe5+ Kc6 36.Qe4+ Kc7

Aug-28-19  mel gibson: <Aug-28-19 FrogC: Easiest puzzle of the week so far.>

That's rubbish - there are heaps of different lines - Stockfish 10 got to over 2 billion nodes for my post above.

There are also passed pawns on both sides to consider plus the loss of Queens.

Aug-28-19  RandomVisitor: After 21...Qxa3 white had a move that was likely better than what was played:

click for larger view


<48/83 1:55:43 +2.18 22.dxc5 Qa2 23.Ng1 0-0-0 24.e6> fxe6 25.Qg4 Kc7 26.Qxe6 Bxc5 27.Qf7+ Be7 28.Rfc1 Qa3 29.Qg7 Rc8 30.Qd4 Kb8 31.Rxc6 Rxh3+ 32.gxh3 Rxc6 33.Nf3 Rc1+ 34.Kg2 Rxb1 35.Bxb1 Qc5 36.Qxc5 Bxc5 37.Bxg6 a4 38.h4 b5 39.Bc2 Kb7 40.Kxg3 Bf8 41.Nd4 Ka6 42.Ne6 Be7 43.h5 Ka5 44.h6 b4 45.h7 Bf6 46.Nc7 b3 47.Nxd5 bxc2 48.Nxf6 c1Q 49.h8Q

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