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John Pitcher vs Richard A Bates
"Pitcher Perfect" (game of the day Mar-21-2019)
4NCL (2012/13), Sunningdale ENG, rd 2, Nov-04
Sicilian Defense: Closed Variation. Traditional (B25)  ·  1-0
ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
Mar-21-19
Premium Chessgames Member
  Sargon: Where did Black go wrong?

Did it possibly begin with Black NOT playing 8...Nxb3?

Mar-21-19  newzild: <Sargon> White's light-squared bishop is his least-useful piece in the ensuing attack, so I don't think Nxb3 would have helped.

I think Black was positionally lost when he allowed e5 and f5, so maybe 15...d5 was the culprit.

Mar-21-19  actinia: I like 10. ... e5 a lot more than Bc5
Mar-21-19  goodevans: <newzild: ... maybe 15...d5 was the culprit.>

With you on that. Not only allowing the e5, f5 advance but also shutting the a8-h1 diagonal for his LSB.

Also <16...Nh7> was a strange choice over <16...Nd7>. Why not give yourself the option to capture on e5 with the N?

Mar-21-19
Premium Chessgames Member
  offramp: This game was played at Sunningdale. I did not know that anything except golf was played there.

It is odd really: "Where shall we play our game of chess?"

"How about Sunningdale? The famous golf course."

It's just ODD.

Mar-21-19
Premium Chessgames Member
  Breunor: To answer Sargon, according to Stockfish, black starts to go bad with 15 d5:

1) +0.96 (18 ply) 16.e5 Nd7 17.Qg4 Rfe8 18.Nh5 Bf8 19.f5 exf5 20.Rxf5 Nxe5 21.Nf6+ Kh8 22.Nxe8 Rxe8 23.Qg3 Bd6 24.Re1 Bc8 25.Rf4 Bd7 26.Qf2 f6 27.Bxd5 Qxc2

Dead even is a5:

1) =0.00 (20 ply) 15...a5 16.a4 bxa4 17.Bxa4 Qb6 18.Nh5 Nxh5 19.Qxh5 d5 20.e5 Bb4 21.Bxb4 Qxb4 22.Rfb1 Qd2 23.Rf1 Qb4

Things get worse with the ugly looking Nh7

1) +1.38 (19 ply) 17.Qg4 f5 18.exf6 Nxf6 19.Qxe6+ Qf7 20.Qxf7+ Kxf7 21.h3 Rfe8 22.a4 Bc6 23.axb5 axb5 24.Rad1 b4 25.Rde1 Ba4 26.Rxe8 Bxe8 27.Re1 Bd6

Better is the obvious Nd7:

1) +1.03 (17 ply) 17.Qg4 Rfe8 18.Nh5 Bf8 19.f5 exf5 20.Rxf5 Nxe5 21.Nf6+ Kh8 22.Nxe8 Rxe8 23.Qg3 Bc6 24.Rff1 f6 25.a4 bxa4 26.Bxa4 Bxa4 27.Rxa4 Qxc2

Black can improve with 19 a5 - this is a theme that Stockfish several times indicates this move was missed:

1) +0.53 (20 ply) 20.Rae1 Qc7 21.a4 Rfb8 22.axb5 a4 23.Ba2 Bc8 24.h4 Bf8 25.hxg5 hxg5 26.c4 dxc3 27.Bxc3 Qf4 28.Qxf4 gxf4 29.Rxf4 Rxb5 30.Bb1 Bb7 31.Rh4 a3 32.bxa3 Rxa3

The clear losing move though is again kind of obvious, 23 gxh4?

1) +2.60 (17 ply) 24.Qh5 h3 25.Qxh3 Bf8 26.Qxh6 e5 27.Rf5 Bxg7 28.fxg7+ Rxg7 29.Bg5 Rg6 30.Qh5 Rxg5 31.Rxg5 f6 32.Rg4 Rg8 33.Rxg8+ Kxg8 34.Qg6+ Kh8

It isn't obvious (at least to me) that g4 keeps black in the game:

1) +0.96 (20 ply) 23...g4 24.Qxg4 a5 25.Qh5 a4 26.Bf4 Bd6 27.Bxd6 Qxd6 28.Bxa4 Rxa4 29.Qxf7 Bc8 30.Qh5 Rxa2 31.Qxh6 Qf8 32.Re2 Qf7 33.b3 Rb2 34.g4 e5 35.Rxe5 Rxc2

It looks like this line saves a tempo over the game move, as white has to stop to take the pawn before playing Qh5, and once again, black is supposed to play a5!

All in all, black's missing a5 seems to have a major impact on the game outcome.

Mar-26-19  cormier:


click for larger view

Analysis by Houdini 4 d 24 dpa done

1. + / - (0.85): 17.f5 Qxe5 18.Bf4 Qf6 19.Nh5 Qh4 20.Bg3 Qd8 21.fxe6 Qe7 22.exf7+ Rxf7 23.Rxf7 Qxf7 24.Be5 g5 25.Qg4 Rf8 26.Ng3 Nf6 27.Qh3 Nd7 28.Rf1 Qe7 29.Rxf8+ Nxf8 30.Qf5 Qf7 31.Qxf7+ Kxf7 32.Nf5 Nd7 33.Bxd4 Bf8 34.c3 Ke6 35.Ne3 Ne5 36.Bc2 Nc6 37.Bh8 d4 38.Bb3+ Kd7 39.Bxd4 Nxd4 40.cxd4 Kd6 41.Kf2 Bc8 42.Kf3 Bb7+ 43.Kg4 Bc8+ 44.Nf5+ Bxf5+ 45.Kxf5

2. + / - (0.80): 17.Qg4 f5 18.exf6 Nxf6 19.Qxe6+ Kh8 20.a3 a5 21.a4 Bc8 22.Qe5 Qb6 23.Qe1 Re8 24.Qd1 Bg4 25.Qb1 Bd7 26.Re1 Rxe1+ 27.Bxe1 b4 28.Bd2 Bd6 29.Qf1 Rc8 30.Re1 Kh7 31.Qf3 Qc5 32.h3 Qc7 33.Ne2 Qc5 34.f5

Mar-26-19  cormier:


click for larger view

Analysis by Houdini 4 d 23 dpa done

1. + / = (0.46): 16...Nd7 17.Qg4 Rfe8 18.Nh5 Bf8 19.f5 Qxe5 20.Bxh6 Nf6 21.Nxf6+ Qxf6 22.Bg5 exf5 23.Rxf5 Qe6 24.Raf1 g6 25.Bf6 Bg7 26.Qxd4 gxf5 27.Bxg7 Rac8 28.Bh8 Qg6 29.Be5 Qe6 30.Bg3 Qg6 31.Qf2 Kg7 32.c3 Re7 33.Bd1 f6 34.Qxf5 Qxf5 35.Rxf5 Kg6 36.Rf1 Rce8 37.Bg4

2. + / - (0.78): 16...Ne8 17.Qg4 Bc8 18.a4 f5 19.Qg6 Rb8 20.Be1 b4 21.Rf3 Kh8 22.Bf2 a5 23.Re1 Rb7 24.h3 Ra7 25.Kh2 Rb7 26.Ne2 Qb6 27.Rg3 Bd7 28.Bg1 Rc7 29.Rd1 Rc8

3. + / - (1.09): 16...Nh7 17.Qg4 f5 18.exf6 Nxf6 19.Qxe6+ Kh7 20.Qh3 Bc6 21.f5 a5 22.a3 Rae8 23.Rae1 Rxe1 24.Bxe1 a4 25.Ba2 Bb7 26.Nh5 Bd6 27.Nxf6+ Rxf6 28.Bf2 Qxc2 29.Bxd4 Bc5 30.Qe3 Bxd4 31.Qxd4 h5 32.g3 h4 33.gxh4 Qd2 34.Rf2 Qc1+

Mar-26-19  cormier:


click for larger view

Analysis by Houdini 4 d 24 dpa done

1. = (0.11): 15...a5 16.a4 bxa4 17.Bxa4 Bb4 18.Bxb4 axb4 19.Qf3 Qc5 20.Bb3 g6 21.h3 Rxa1 22.Rxa1 Ra8 23.Rxa8+ Bxa8 24.Kh2 Kg7 25.Ne2 e5 26.g4 Qc7 27.Kg2 Qe7 28.Ng3 Bb7 29.Nf1 Nd7 30.Nd2 Nc5 31.Bc4 Nd7 32.f5 Qg5

2. + / = (0.44): 15...d5 16.e5 Nd7 17.Qg4 Rfe8 18.Nh5 Bf8 19.f5 Qxe5 20.Bxh6 Nf6 21.Nxf6+ Qxf6 22.Bg5 exf5 23.Rxf5 Qe6 24.Raf1 g6 25.Bf6 Bg7 26.h3 Bxf6 27.Rxf6 Qxg4 28.hxg4 Re7 29.R6f4 Kg7 30.Rxd4 Rc8 31.a4 Rcc7 32.Rdf4 Re6 33.axb5 axb5 34.Kh2 Bc6 35.Ra1 Re2 36.g5 d4

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