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Alexis Murillo Tsijli vs Eduardo Iturrizaga Bonelli
Torneo Zonal FIDE 2.3 Masculino (2009), San Jose de Costa Rica CRC, rd 8, Jun-24
Nimzo-Indian Defense: Normal Variation. Bernstein Defense (E59)  ·  0-1

ANALYSIS [x]

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Kibitzer's Corner
Oct-18-22
Premium Chessgames Member
  Korora: So my first guess was the right one.
Oct-18-22  Brenin: 42 ... Nf3+ 43 Rxf3 (otherwise 43 ... Nxe1) Rc1 wins the Q, e.g. 44 Re8+ Kh7 (and thank goodness the White Q is pinned, so 45 Qh4 mate is impossible) 45 Rf1 Rxe1 46 Rxe1 leaves Black with Q+2P for R+B, enough for a win.
Oct-18-22  jrredfield: I saw the first three plies in a few seconds. After that it's up to White how he wants to stall the inevitable capture of the pinned Q so I didn't analyze further. <Brenin> summed it up nicely. Here's Komodo Dragon's analysis:

White +13.56: 42. ... ♘f3+ 43.♖xf3 ♖c1 44.♖f1 ♖xe1 45.♖xe1 ♖e7 46.♖xe7 ♕xe7 47.h4 ♕b4 48.♖c1 ♕xh4 49.♗d4 ♕xg5+ 50.♔f1 b4 51.♖c8+ ♔h7 52.♖c2 ♕f5+ 53.♖f2 ♕d5 54.♖c2 ♕e4 55.♖e2 ♔g8 56.♔f2 b3 57.♖b2 a5 58.♔e2 ♕d5 59.♖d2 ♕h5+ 60.♔f2 ♕h2+ 61.♔e1 ♕h4+ 62.♖f2 a4 63.♗b2 ♕b4+ 64.♔d1 a3 65.♖e2 ♕d6+ 66.♔e1 ♔h7 67.e4 axb2 68.♖xb2

Oct-18-22  Cheapo by the Dozen: White's f1 rook is overloaded.

Black didn't actually gain that much immediate material from the combination, which may be why this isn't a Monday puzzle. But he went into it a couple of pawns up, and gained valuable simplification.

Oct-18-22
Premium Chessgames Member
  al wazir: This one actually was easy.
Oct-18-22  mel gibson: I saw that but I didn't see that it was winning so well. It looked almost even.
This puzzle was not easy.

Stockfish 15 says:

42... Nf3+

(42. .. Nf3+ (♘e5-f3+ ♖f1xf3 ♖c8-c1 ♖f3-f1 ♖c1xe1 ♖f1xe1 ♖d7-e7 ♖e4xe7 ♕a3xe7 ♔g1-f2 ♕e7xg5 ♗a1-d4 ♕g5-h4+ ♔f2-e2 ♕h4xh3 ♖e1-g1 f7-f6 ♖g1-a1 g6-g5 ♖a1xa6 g5-g4 ♖a6-a8+ ♔g8-h7 ♖a8-a1 ♕h3-f3+ ♔e2-d2 g4-g3 ♖a1-e1 ♔h7-g8 e3-e4 g3-g2 e4-e5 f6xe5 ♗d4-g1 b5-b4 ♗g1-h2 ♕f3-f2+ ♖e1-e2 ♕f2-d4+ ♔d2-c2 ♕d4-c4+ ♔c2-d2 ♕c4-c3+ ♔d2-d1 b4-b3 ♖e2xg2 ♕c3-f3+ ♖g2-e2 b3-b2 ♔d1-c2 ♕f3xe2+ ♔c2-b1 ♕e2xh2 ♔b1-a2 b2-b1♕+ ♔a2xb1) +15.64/36 1185)

score for Black +15.64 depth 36.

Oct-18-22  Cheapo by the Dozen: White's queen tour starting on Move 24 was remarkable and ultimately rather pointless.
Oct-18-22  saturn2: Win the queen for knight and rook and the pawns on the queenside decide.
Oct-18-22  stacase: Unlike yesterday, it really was easy.
Oct-18-22
Premium Chessgames Member
  An Englishman: Good Evening: Almost a century old, the Bernstein Defense still contains its mysteries, starting with--why Bernstein? Reshevsky popularized the line, playing both with and against it.
Oct-18-22  agb2002: Black has a knight and two pawns for a bishop.

White threatens Rxe5.

The rook on f1 is overburdened with the defense of f3 and c1. Hence, 42... Nf3+ 43.Rxf3 (else Nxe1) 43... Rc1 44.Re8+ Kh7:

A) 45.Rf1 Rxe1 46.Rxe1 Re7 47.Rxe7 Qxe7, followed by the advance of the queen's side pawns, is winning.

B) 45.Rf4 Rxe1+

B.1) 46.Kf2 Rd2+ 47.Kf3 (47.Kxe1 Qc1#; 47.Kg3 Rxe3+ 48.Rxe3 Qxe3+ wins) 47... Rf1+ 48.Kg3 Rxf4 wins.

B.2) 46.Kg(h)2 Rd2+ as above.

Oct-18-22  Brenin: Instead of 33 Re5, which appears to have been the losing move, 33 Rxf6 gxf6 34 Ne4, threatening a massive fork on f6, would have given White a good chance of survival, e.g. 34 ... Nxc5 35 Nxd6 Rxd6 36 dxc5 Rd1+ 37 Kh2 Rxa1 38 axb5 axb5 39 Qxf6 with Q vs 2R.
Oct-18-22  TheaN: After <42....Nf3+ 43.Rxf3 Rc1>, you need to take a quick glance to see that <44.Re8+ Kh7 45.Rf1 Rxe1 46.Rxe1 Rc7 -+> (or the only slightly lesser text move) wins rather swift, because White has to trade rooks to save the bishop.

In fact, after checking, I noticed the 'endgame' is worse for White than it looks. After 46....Rc7, the obvious threat is Rc1 with Qxa1. If White were to move the bishop from harm, 47.Bd4, Black mates with 47....Rc2:


click for larger view

And White can't prevent Qa2 with Rg2+ and mate over the light squares.

Oct-18-22
Premium Chessgames Member
  chrisowen: I garlands it court bend Nf3+ axiom jah its doh its van og jag aod in jade its Nf3+ cite;
Oct-18-22  AlicesKnight: Saw the Nf3+ line after a few moments; Q for R/B should be enough with good Ps.
Oct-18-22
Premium Chessgames Member
  eternaloptimist: I saw the deflection sac w/ 42...♘f3+ & solved this puzzle

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