Thursday, 28 December 2023

Kraków Seniors Round Two

Spanton (1743) - Piotr Sanetra (2012)
Spanish Exchange
1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Bxc6 dxc6 5.d4 exd4 6.Qxd4 Qxd4 7,Nxd4 c5 8.Ne2 Ne7!?
This rare continuation has been tried, according to ChessBase's 2024 Mega database, by three players rated over 2400, scoring +1=2-0
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9.Bf4 c6 10.Bd6 Ng6!?
Stockfish16 and Komodo14.1 agree this is Black's best move.
11.Bxf8 Rxf8
Black no longer has the bishop-pair as compensation for an inferior pawn-structure, but the engines reckon White is at best slightly better
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12.Nbc3 b5 13.0-0-0 Bd7 14.h4 0-0-0
Both sides have castled - who stands better?
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White has the better pawn-structure, but Black has the only piece that can operate long-range on diagonals, which seems to be enough for the engines to call the position completely equal.
15.h5 Ne5 16.f3 g5!?
Counter-intuitive, but the engines are OK with it.
17.hxg6 hxg6 18.Nf4 Rh8!?
A clever way to discourage Nd3.
19.Rde1!?
After 19.Nd3 Nxd3+ 20.cxd3 White gets a backward pawn on a half-open file.
19...Kc7 20.Nfe2 Be6 21.Nf4 Bc8 22.Nd1 a5 23.Rxh8!? Rxh8 24.Ne3 Rh4
PS offered a draw.
25.Ne2 Be6 26.a3
Not 26.Ng3? Bxa2 27.b3 c4 28.Kb2 as 28...cxb3 saves the bishop, thanks to 29.cxb3? losing to 29...Nd3+ etc.
26...a4 27.Ng3 Nc4 28.Nxc4 Bxc4
Black has reached an ending of rook-and-bishop versus rook-and-knight, but still has the inferior pawn-structure - completely equal, according to the engines
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29.Kd2 Rh2 30.Rg1 Kd6 31.Ke3 f6 32.Kf2 Ke5 33.Ke3 g5 34.Nh1 Be6 35.Nf2 c4 36.c3 f5 37.exf5 Bxf5 38.Nh1
The engines reckon 38.g4!? gives a slight edge.
38...Rh8 39.Ng3 Bc2 40.Kd2 Bd3 41.Ke3 Rh2 42.Kf2 Rh6 43.Re1+ Kd5 44.Re8 Rf6!?
Continuing to play actively.
45.Rg8 Bg6 46.Ne2 Ke5 47.g3 Rd6 48.Nd4 c5 49.Ne2 Rb6?!
The engines reckon 49...Kf6 maintains equality.
50.Rc8
White is better after 50.f4+!?, according to the engines.
50...Kd6 51.f4 gxf4 52.Nxf4 Bc2 53.Rd8+ Kc7?
White only has a slight edge after 53...Kc6, according to the engines.
White to play and win
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54.Nd5+??
This turns a win into a loss. Correct is 54.Rd2. I rejected it because of 54...Be3, but the engines continue 55.Ke3 Ba8 56.Rd5, which wins a pawn and kills Black's counterplay down the b file as 56...Kc6 is met by 57.Rd8, eg 57...Bb7 58.Nd5 Ra6 59.Kf4, after which Black is in a sorry mess on the queenside, while the f pawn prepares to march on.
54...Kxd8 55.Nxb6 Be4
This is what I missed. There is no saving the knight.
The game finished:
56.Ke3 Bg2 57.g4 Kc7 58.Nxa4 bxa4 59.Kf4 Kd6 60.Kf5 Bh3 61.Kf4 Ke6 62.g5 Bf4 0-1

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