Klaus Petzold vs Aleksey Dreev (2008)

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Klaus Petzold vs Aleksey Dreev
European Club Cup (2008), Kallithea GRE, rd 1, Oct-17
English Opening: Agincourt Defense. King's Knight (A13) · 0-1

ANALYSIS [x]

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< Earlier Kibitzing · PAGE 1 OF 2 · Later Kibitzing>
Jan-16-19		landshark: Oops - I thought 27...Qe2 worked but alas White's 28.Qe1 holds easily. Another won game lost to careless haste -

Jan-16-19		Cheapo by the Dozen: Black is down a couple of pawns, has a hanging knight, and doesn't have a lot of other material. So it's natural to look at the two NxP moves. ... Nxf2 serves to unblock the f-pawn and open the long diagonal. Further, the knight forks the bishop and the deadly attacking square d3, and is poisoned. That quickly leads us to see that White's only possible response is Bf5. At that point I was planning ... g6, which wins resoundingly, rather than the yet better game move. Oh well. I still feel I solved the puzzle. :)

Jan-16-19		saturn2: I saw 26...Nxf2 27. Kxf2 Qe2+ 28. Kg1 f2# 27. Bf5 Qc5 28. Ne3 Rd1+ 29. Nxd1 Nxd1+ 30. Kh1 f2+ 31. Be4 Bxe4# 27. Qe3 Nxh3+ plus piece, mate soon

Jan-16-19		saturn2: In my second line there is 29. Qxd1 Nxd1 30. Rxd1 Q vs R+N so still winning

Jan-16-19		wtpy: 24 ...Black to move is weekend territory.

Jan-16-19		agb2002: Black is two pawns down. White threatens Bxg4. The white king is the only defender of f2. This suggests 26... Nxf2: A) 27.Kxf2 Qe2+ 28.Kg1 f2#. B) 27.Bf5 Rd8 (27... g6 28.Qc2 unclear) 28.Qb2 Rxa1 B.1) 29.Qxa1 Nh3+ 30.Bxh3 (30.Kh1 f2+ 31.Be4 B(Q)xe4#) 30... Qc5+ 31.Ne3 (31.Kh1 f2#) 31... Qxe3+ 32.Kf1 Qe2+ 33.Kg1 f2#. B.2) 29.Qxf2 Re1 with the threat Re2 seems to win. B.3) 29.Kxf2 Qe1+ 30.Kg1 Qxf1#.

Jan-16-19		Walter Glattke: 27.Bf5 Nd1 28.Bxh7+ Kxh7 29.Qc2+ Kh8 30.Rxd1 Qc5+ 31.Qf2 Qxf2+ 32.Kxf2 Rxd1 decisive material 30.h4 Ne3 31.Nxe3 Qxe3+ 32.Kh2 Rd2+ decisive material

Jan-16-19		goldfarbdj: I also thought 27 ... Qe2, meeting 28 Qe1 with Nh3+, but White has Bxh3. Even seeing the move Nd1, I didn't understand the threat for quite some time: it is 28 ... f2 mate. <Walter Glattke>: Doesn't Black keep a stronger attack by just refusing the bishop sac with 28 ... Kh8?

Jan-16-19		Tomate: 26...Nxf2 27.Bf5 Qe2 28.Qe1 Rd1 29.Qxf2 Rxa1. The threat 30..Rxa2 31.Qxe2 fxe2 32.Kf2 exf1+ wins a piece so Black ends with a full rook ahead. I did not see the cute 27..Nd1, but the difference is small.

Jan-16-19		Walter Glattke: Yes, black wins a tempo, e.g. 29.Qxd1 Rxd1 30.Rxd1 Qe2 31.Rd2!? f2# or 29.Qc2 f2+ 30.Qxf2 Nxf2 31.Kxf2 Qf6+ for mate or Qxa1.

Jan-16-19		Lambda: I found my inaccurate but still winning line to be very aesthetically pleasing. 26...Nxf2 27.Bf5 Nh1!? click for larger view with the threat of f2 mate regardless of whether white takes on h1. (I don't remember if I erroneously dismissed Nd1 or just didn't consider it for some reason.) Now if white makes room for the king on f1 whilst defending against Qe3 with 28. Ne3, black has 28...Rd1+! click for larger view 29.Nxd1 Qe1# or 29.Qxd1 Qxe3+ with mate to follow. However, white can play 28.h3 or 28.h4, and while black should win, and this is intuitively obvious, it isn't simple.

Jan-16-19		jith1207: A bit tough for Wednesday, couldn't find the last knight brilliant move. It takes even more to get the mate after 28. h4 Qe2 29. Qc2 f2+ 30. Kh2 Qxf1 31. Bxh7+ Kf8 32. Be4 Qg1+ 33. Kh3 f1=Q+ 34. Kg4 Bd7+ 35. Bf5 Bxf5+ 36. Qxf5 Ne3+ 37. Kg5 Qxf5#

Jan-16-19		jith1207: That's very brilliant <Lambda>.

Jan-16-19		malt: Had 26...N:f2 27.Bf5 (27.K:f2 Qe2+ 28.Kg1 f2# ) 27...Nd1 28.h4 (28.Qc2 f2+ wins ) 28...Qc5+ 29.Kh2 Qf2+ 30.Kh3 Q:f1+ 31.Kg4 Rd4+

Jan-16-19		Defrogger: I got it, including ...Nd1. I toyed with ...Rd1 for material gain, but eventually went with threat of mate on the move. Position seems more suited for Wednesday or later as there is forced mate.

Jan-16-19		Defrogger: Oops, no forced mate.

Jan-16-19		TheaN: Wednesday 16 January 2019 <26....?> What's interesting about this position is that <26....Nxf2> in itself is obvious. A) <27.Kxf2 Qe2+ 28.Kg1 f2#> is very nice, but certainly not what White will play. B) <27.Ne3> possibly the most neutral way to surrender Bh3, but should be lost because the attack doesn't diffuse after <27....Nxh3+ -+>... in fact, 28.Kf1 Rd1+! 29.Qxd1 Qxe3 -+ is forced and down and out, but that I did not foresee. C) <27.Bf5> is definitely the most practical defense. I went with <27....Rd1 -+> and tbh, I think it sufficiently solves the position, though perhaps Nd1 is more neat. Black utilizes the only piece that was still idle in the attack, and I don't see any practical way to solve the problems. Obviously, 28.Qxd1 Nxd1 is lost, as Black immediately threatens Qc5+. The inbetween 28.Bh7+ Kh8 is harmless. 28.Qb2/Qc2 will see Qe2! whereas the second rank threats (Nh3 with f2#) decide. After 28.Qf4 Black can simply play 28....Rxa1, not necessarily winning a Rook, but creating back rank threats. After 29.Qb8+ Be8, White has no real defenses against Rxf1+.

Jan-16-19		Jimfromprovidence: I got the line 26...Nxf2 27 Bf5 Qe2 as well. A nice wrinkle is that after 28 Qe3?! (instead of 28 Qe1), 28...Nd1, below, is the correct move in both cases. click for larger view The threat is 29...Qg2# so this forces 29 Qxe2 with black winning after 29...fxe2. click for larger view

Jan-16-19		cormier: click for larger view Analysis by Houdini 4 d 22 dpa done 1. - + (-4.45): 24...Nxf2 25.Ne3 Nfg4 26.Kh1 Qc5 27.Nxg4 Nxg4 28.b4 Qxb4 29.Qf4 Qa4 30.h3 Nf6 31.Rc1 Qa5 32.Rf1 Qc5 33.Rc1 Rd4 34.Kh2 Rxc4 35.Rxc4 Qxc4 36.Qc7 Ne8 37.Qb6 Bd7 38.Qd8 Bb5 39.Qd2 Nf6 40.e3 Bd7 41.Qb2 Nd5 42.Qd2 h6 2. - + (-2.84): 24...Qc5 25.Qe1 e3 26.Nxe3 Nxe3 27.Bxc6 Nc2 28.Rd1 Nxc6 29.Rxd8+ Nxd8 30.Qd1 Nd4 31.h4 N4c6 32.Kg2 g6 33.Qd2 Qa3 34.h5 gxh5 35.Qg5+ Kf8 36.Qh6+ Ke8 37.Qe3+ Ne6 38.Qe4 Ne7 39.Qc2 Ng5 40.Qd2 Qc5 41.Qf4 Nc6 42.Qc7 Ne4 43.e3 Kf8 44.Qf4 Nc3 45.a4 Kg7

Jan-16-19		cormier: click for larger view Analysis by Houdini 4 d 20 dpa done 1. - + (-2.20): 24.Qb1 Qc5 25.Qe1 e3 26.fxe3 Bxg2 27.Kxg2 Nxe3+ 28.Nxe3 Qxe3 29.Rd1 Qe4+ 30.Kg1 Re8 31.Qd2 Ng4 32.e3 Ne5 33.Qe2 Nf3+ 34.Kh1 Ng5+ 35.Qg2 Qxe3 36.Rf1 Ne4 37.Qg1 Qd2 38.Qg2 Qa5 39.Qf3 Qa7 40.Qg2 Qc5 41.Qf3 f6 42.Qf5 Qa3 43.Qd5+ Kf8 44.Ra1 Nc3 45.Qb7 Qc5 46.Rf1 Kg8 47.a4 2. - + (-2.99): 24.Rb1 Qc5 25.e3 Nd3 26.Qc2 h6 27.a4 Rb8 28.Qe2 Ngxf2 29.Nd2 f5 30.h3 Qd6 31.Kh2 Qb4 32.Ra1 Rd8 33.Rf1 Qc3 34.Kg1 g6 35.c5 Kg7 36.Kh2 Qxc5 37.Nc4 Rb8 38.Rxf2 Nxf2 39.Qb2+ Kh7 40.Qxf2 Rxb3 41.Qc2 Bxa4 42.Bf1 Kg7 43.Kg2 Qc7 3. - + (-3.69): 24.e3 Nd3 25.Qc3 Ngxf2 26.h4 Qa3 27.Qc2 Ng4 28.Qd2 Nge5 29.Rd1 f5 30.Nh2 Qd6 31.Nf1 Be8 32.Qe2 Qa3 33.h5 Rd6 34.Rd2 Qc5

Jan-16-19		cormier: click for larger view Analysis by Houdini 4 d 25 dpa done 1. - / + (-1.30): 22.Qc3 Rxd1 23.Rxd1 Rxa2 24.Rd2 Ra3 25.Rd1 g6 26.Ra1 Nfd7 27.Rxa3 Qxa3 28.Nd2 f5 29.h3 Kf7 30.Nf1 h6 31.Nd2 Ba8 32.Kh2 g5 33.f4 Ng6 34.e3 Nc5 35.Bf1 Bb7 36.Be2 gxf4 37.gxf4 2. - / + (-1.40): 22.Qb6 Rxd1 23.Rxd1 Rxa2 24.Rd2 Rxd2 25.Nxd2 Qd6 26.Nf1 g6 27.Qa5 Qd4 28.Qd2 Qa1 29.h3 Kg7 30.g4 h6 31.Qd6 Qb2 32.Qc5 Bb7 33.Qb6 Bc8 34.Qe3 Ned7 35.Ng3 Bb7 36.Kh2 Qc2 37.Qd4

Jan-16-19		cormier: click for larger view Analysis by Houdini 4 d 22 dpa 1. = / + (-0.68): 21.h3 h5 22.a4 Rdb8 23.a5 Nc5 24.Qe3 Rb7 25.Rab1 Rab8 26.Qf4 Rb4 27.Ra1 h4 28.Qxh4 Nxb3 29.Nxb3 Rxb3 30.a6 Qb4 31.a7 Ra8 32.Qg5 Qxc4 33.Rd6 Rb5 34.Qe3 2. - / + (-0.89): 21.Qc3 Nc5 22.h3 Ne6 23.Qb2 Qa3 24.Qxa3 Rxa3 25.f3 exf3 26.exf3 Rda8 27.Nf1 Bb7 28.Rd6 Ng5 29.Nd2 Ne8 30.Rb6 Bc8 31.h4 Rxa2 32.Rxa2 Rxa2 33.Rb8

Jan-16-19		cormier: click for larger view Analysis by Houdini 4 <d 22 dpa done 1. = / + (-0.37): 20.Nf1> Ne5 21.Rxd4 Rfb8 22.Rad1 g6 23.Ne3 Ra7 24.Nc2 Ne8 25.h3 f5 26.Ne3 Nf7 27.R4d2 Nf6 28.Nc2 Raa8 29.Nd4 Be8 30.Qc3 Ra3 31.c5 Rd8 32.c6 2. = / + (-0.59): 20.Qxd4 Rfd8 21.h3 Ne5 22.Qe3 Ng6 23.a4 Rdb8 24.Rac1 Rb4 25.Ra1 Qe5 26.f4 Qf5 27.Qd4 Qa5 28.Rab1 Rd8 29.Qe3 Qf5 30.Nf1 Rdb8 31.Rd6 Ne7 32.Nd2 Ne8

Jan-16-19		cormier: click for larger view Analysis by Houdini 4 d 22 dpa done 1. - / + (-0.72): 18...Rfb8 19.Ne1 e4 20.Nf1 Ne5 21.Qc2 Ra3 22.Nd2 Neg4 23.Nf1 Qe6 24.h3 Ne5 25.Nd2 Ng6 26.Qb2 Ra7 27.Nf1 h5 28.Qd2 h4 29.Qg5 Nd7 30.gxh4 Qd6 31.Ng3 Nf4 32.Nxe4 Nxe2+ 2. = / + (-0.62): 18...Ra6 19.Nh4 e4 20.f4 exf3 21.exf3 Qe3+ 22.Kh1 Re8 23.a4 g6 24.Nf1 Qe5 25.Re1 Qxe1 26.Rxe1 Rxe1 27.Kg1 Re8 28.Qc2 Bb7 29.f4 Bxg2 30.Qxg2 Rae6 31.Qd2 Re2 32.Qd3 Ra2 33.h3 Ne4 34.Nf3 Kg7 35.Ng5

Jan-16-19		cormier: click for larger view Analysis by Houdini 4 d 22 dpa done 1. - / + (-0.81): 17...Ng4 18.b4 cxb4 19.Qb2 Ra8 20.h3 Ngf6 21.Ne1 Bxg2 22.Kxg2 Rfb8 23.Nd3 Nc5 24.Nxc5 Qxc5 25.Rdb1 h6 26.Qb3 h5 27.Qc2 h4 28.gxh4 Qc6+ 29.Kg1 Ra3 30.Rb3 Rba8 31.Rxa3 Rxa3 2. = / + (-0.67): 17...Rfe8 18.Ne1 e4 19.Nf1 Ne5 20.h3 Ra8 21.Qb2 h6 22.Rab1 Reb8 23.Qc2 Ra3 24.Nd2 Qb7 25.Qb2 Rba8 26.Ra1 Qc7 27.Nc2 R3a6 28.a4 d3 29.exd3 Nxd3 30.Qc3

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