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Kenneth McDonald vs Alexiei Bottino
Internet Section 15-A (2003) (blitz), Dos Hermanas, rd 3, Mar-15
Sicilian Defense: Old Sicilian. Open (B32)  ·  1-0

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
Apr-08-21
Premium Chessgames Member
  An Englishman: Good Evening: Interesting sacrifice. Black saw no immediate mate and thought it had to fail, but after the fireworks we see that White wanted passed pawns.

Nonetheless, can't help but wonder if a draw lurks somewhere in the tall grasses. Would 45...Qc1+ have salvaged a perpetual check? Or some other move?

Apr-08-21  Walter Glattke: A) 39.g6 Qd8 40.Rxf7+ Bxf7 41.gxf7 Rxf7 42.Rxf7+ Kc6 (Kc8 Qf5+ wins) 43.Qh6+ Rc7+ mating B) 39.Rxf7+ Rxf7 40.Re7 wins
C) match 42.Qe6+ (42.g6? Rh8+ 43.Kg2 Qxe5 black advantage) 42.-Kc5 43.g6 Qf8 (Qe8 Qd5+) simplification: 44.Qd5+ Qxd5 45.exd5 Kxd5 46.Kg2 b4 47.Kf3 Rg7 48.b3 Ke6 49.Ke6 or 48.-Rxg6 49.Bxg6 Kxg6 50.Ke5 mabe you can play this as BLITZ
Apr-08-21
Premium Chessgames Member
  malt: Went with 39.R:f7+ B:f7

(39...R:f7 40.R:f7+ B:f7 41.Q:f7+ )

40.R:f7+ R:f7 41.Q:f7+ Kc6 42.Qf6+ Kc5 43.g6 Qf8 44.Qf7

Apr-08-21  Walter Glattke: C) sorry, wrong diagram, C) 46.Kh2 Ke6 47.Kg3 Kf6 48.Kf4 b4 49.b3 Rxg6 50.Bxg6 Kxg6 51.Ke5 D) 46.Kh2 Kc5 47.Kg3 Kb4 48.Kf4 Ka4 49.b3 Ka5 50.Kg5 Kb6 51.Kh6 Kc7 52.Kh7 Kd7 53.g7 Ke7 54.Bh7 Rc8 55.g8Q E) 46.Kh2 Ke5 47.Kg3 b4 48.Kg4 Kd4 49.Kg5 Ke3 50.Kh6 Kf4 51.Kh7 Rc8 52.g7 this is to win with blitz and no countercheck easily.
Apr-08-21  AlicesKnight: I saw the basic gameline, without being convinced it was a clear White win if Black could start a counter-attack. I'm evidently wrong.
Apr-08-21  saturn2: Black threatens Rh8, Qxe5 and Rxg5 but white has plus pawns. I saw the exchangesacrifice 39.Rxf7 is justified by the resulting pawn g6 supported by the Bd3
Apr-08-21  goodevans: The sac on f7 was clearly right. I don't think we can glean too much from the game after that as there were probably quite a few inaccuracies on both sides. For example, 42.Qf6+ looks more accurate than 42.Qe6+ because with the latter black could have won the e-pawn with 43...Re8.
Apr-08-21
Premium Chessgames Member
  ajk68: 45...Rh8 is much stronger. There are some possibilities of perpetual check if white doesn't play accurately.
Apr-08-21  Brenin: This was not difficult, once I realised that a mate was neither available nor needed, and that provided the passed pawn on g5 could be protected with an early g6, the ending was going to favour White, who always seems have enough resources to avoid perpetual check.
Apr-08-21  Brenin: <ajk68>: 45 ... Rh8 allows 46 Qc7+ Kd4 (Kb4 47 Qc3+ Ka4 48 Qa3 mate) 47 Qc3+ Ke3 48 Bxb5+, and White, with 4P for the exchange, is clearly winning.
Apr-08-21  mel gibson: I saw that - it was easy.

Stockfish 13 says:

39. Rxf7+

(39. Rxf7+ (♖f4xf7+ ♖g7xf7 ♖f1xf7+ ♗e6xf7 ♕h5xf7+ ♔d7-c6 ♕f7-f6+ ♔c6-b7 g2-g3 ♖g8-f8 ♕f6-e7+ ♔b7-a8 g5-g6 ♖f8-e8 ♕e7-f7 ♕b8xe5 g6-g7 ♖e8-d8 g7-g8♕ ♖d8xg8 ♕f7xg8+ ♔a8-b7 ♔h1-g2 ♕e5xb2 ♕g8xd5+ ♔b7-c7 ♕d5-c5+ ♔c7-d8 ♕c5-d6+ ♔d8-c8 ♗d3-f5+ ♔c8-b7 ♕d6-c5 ♕b2-f6 ♕c5xb5+ ♔b7-c7 ♕b5-d7+ ♔c7-b6 ♕d7-e6+ ♕f6xe6 ♗f5xe6 ♔b6-c7 ♗e6-c4 ♔c7-d8 g3-g4 ♔d8-e7 ♗c4-d3 ♔e7-e6 g4-g5 ♔e6-f7 c2-c4 ♔f7-e6 ♔g2-f3 ♔e6-e7) +9.54/41 869)

score for White +9.54 depth 41

Apr-08-21  Cellist: I could not decide between 39. Bb5+ and 39. Rxf7+. The former only leads to equality. The latter wins, although not in the spectacular and unambiguous way I was hoping.
Apr-08-21  Brenin: White has a spectacular record on CG, namely +31 -1 =1, with the one loss a blunder in a possibly advantageous position (<F. La Rota vs K. McDonald>, 35 .. Kxf5??). The kibitzing on his page gives an interesting explanation of his record.
Apr-08-21
Premium Chessgames Member
  Who is me: fun game to day !
played to the end.
Apr-08-21
Premium Chessgames Member
  chrisowen: Plague revile Rxf7+ gobble aeschylus dohs backflow whiffs revile guv plague brambles again x hopline revile lags wags wage gain quick knock cutz duff its bandjob res vant alight ivan woody it cosy revile Qb8 grub in a cuff u vant muff Rxg5 gate abridge lugs revile aids aida totups gungho fluffs feel ie Rxf7+ gob;
Apr-08-21  1g1yy: Impressive white could give up the initiative and still regain it. Way too many plies out for me to see that. I probably would have begun with Bf5 and pin the black B, but even that while it saves an exchange, allows the G pawn to survive, where the way it was played it does not. With no solid path to mate, I would be reluctant to trade my 2 R for 1R/1B/1P...
Apr-08-21
Premium Chessgames Member
  agb2002: White has two extra pawns.

Black threatens Rh8, Rxg5 and Qxe5.

The first move that comes to mind is 39.Rxf7+ Bxf7 (39... Kc6 40.Rxg7 wins a third pawn) 40.Rxf7+ Rxf7 (40... Kc6 41.Rxg7 Rxg7 42.Qh6+ wins decisive material; similarly with the other king moves) 41.Qxf7+ Kc6 (else 42.Qxg8+) 42.Qe6+:

A) 42... Kb7 43.Qxd5+ with four pawns for the exchange.

B) 42... Kc7 43.Qd6+ Kc8 (43... Kb7 44.Qxd5+ as above) 44.Bf5+ Kb7 45.Qxd5+ as above.

C) 42... Kc5 43.c3 (threatens 44.b4#) 43... b4 44.Qe7+ Kc6 (44... Kb6 45.Qxb4+) 45.cxb4 again with four pawns for the exchange. However, the pawns are weak and the white king somewhat exposed. Unclear.

Apr-08-21
Premium Chessgames Member
  thegoodanarchist: I found the exchange sac on f7, followed by rook trade, and IMO that counts fully for solving because it is obvious White has outstanding compensation for the exchange.
Apr-08-21  TheaN: Honestly this is a 'feel' sacrifice. After <39.Rxf7 Bxf7 40.Rxf7 Rxf7 41.Qxf7+> White has three pawns for the exchange and initiative. The open h-file is an optical diversion; eventually Black has nothing.
Apr-08-21  KevinDenelsbeck: Proud to have found 43. c3 over the game choice.
Apr-08-21  Brenin: <agb2002>, <KevinDenelsbeck>: Initially, I also thought that 43 c3, threatening mate and forcing 43 ... b4, was an improvement on the game move 43 g6, but OTB I'm not so sure that it is best: by keeping the P on c2 and the B on d3 protecting each other, White is able to escape the Black Q checks, as in the game, by marching his K towards the Q, onto e2. This would be impossible without the P on c2. Objectively 43 c3 may be best, but OTB 43 g6 looks like a better way of avoiding a draw by perpetual check, or the loss of a hanging B.
Apr-08-21
Premium Chessgames Member
  drollere: i began with 39. Bxb5+ to dislodge the Q from the back R. the clearing follows with Qxb5, 40. Rxf7+ Bxf7, 41. Rxf7+ Rxf7, 42. Qxf7+ Kc6, 43. Qxg8 Qxb2, 44. Qe6+ Kc5, 45. g6

perhaps there's a flaw in that, but in the game line white gives up the KB anyway and only after a spate of unseemly and murky scuffling between the Q's.

Apr-08-21  njchess: Once I removed the exchanged pieces, I realized Black was left with a very difficult position. Down pawns, a badly placed queen, a rook that is the only defense against white's advancing pawn, and his king stuck in the middle of the board, and you have, with reasonably accurate play, a White win.
Apr-09-21  KevinDenelsbeck: <Brenin>: You're probably right. I went by what the engine evaluated at that step, but the game move conferred enough advantage + sent a psychological signal, perhaps.

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