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Egor Filipets vs Aleksej Gennadyevich Aleksandrov
Ch-(Men) (2018), rd 8, Jan-25
English Opening: Agincourt Defense (A13)  ·  0-1

ANALYSIS [x]

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sac: 38...Bg7 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
Aug-30-19  goldfarbdj: I actually found the right first move on a Friday for once. The main point is that if White takes the hanging rook, Black has an unstoppable mating attack: 50. Rxd7 Qg1+ 51. Kh3 Qf1+ 52. Kh4 Bf6#, or 52. Bg2 Qf5+ and mate next move.

I have to admit that I didn't consider 50. Qc2: I figured on 50. Qb1, although I get docked some points for not noticing that 50. ... Qf2+ wins the bishop on f3.

Aug-30-19  Jambow: Yeah that was a Wednesday at best saw that in blitz mode.

However nice thought process gets you away from being too materialistic even in an endgame or late middlegame. My pattern of failure is regarding my own king safety, my times of best results are when I look for mate threats in every situation.

Nice puzzle cg.com crew.

Aug-30-19
Premium Chessgames Member
  al wazir: I didn't get it.

I went for the plodding win of a ♙: 49...Qd2+ 50. K any Qxd3.

And a likely draw.

Of course black, realizing that this was drawing, spurned Qxd3 on moves 47 oand 48. (But I couldn't tell that from the puzzle position.)

Aug-30-19
Premium Chessgames Member
  WorstPlayerEver: SF 2019. It reminds me of the last move of the last game.
Aug-30-19  SpamIAm: A nice example of how opposite-colored bishops, while often producing a drawish position in the endgame, often have the reverse effect in the middlegame. White was unable to counter black's dominance on the dark squares.
Aug-30-19  Cheapo by the Dozen: I whiffed, with my core error being not checking to see that there was a mating net WITHOUT the tempo-conceding move ... g5.
Aug-30-19
Premium Chessgames Member
  An Englishman: Good Evening: Couldn't solve it because couldn't find the winning line after 50.Qd1,Qf2+; 51.Kh1. What did I miss *this* time?
Aug-30-19
Premium Chessgames Member
  Gilmoy: 50.Qd1 Qxd1 and Rb7 hangs :) Bf3 can't save them both.
Aug-30-19  mel gibson: I saw the first move almost immediately.
Stockfish 10 says mate in 26 moves:

49... Bd4

(49. .. Bd4
(♗f6-d4 ♕b3-d1 ♕e1xd1 ♗f3xd1 ♖d7xb7 ♔g2-f1 ♖b7-b2 ♗d1-a4 ♖b2-f2+ ♔f1-e1 ♖f2xh2 ♔e1-f1 ♖h2-f2+ ♔f1-e1 ♖f2-g2 ♔e1-d1 ♖g2xg3 ♔d1-c2 h5-h4 ♗a4-d7 h4-h3 ♗d7-c6 h3-h2 ♗c6-a8 ♖g3-g1 ♔c2-b3 ♖g1-c1 ♗a8-g2 f7-f5 ♗g2-f3 f5-f4 ♗f3-d5 h2-h1♕ ♗d5xh1 ♖c1xh1 ♔b3-c4 ♗d4-f6 ♔c4-d5 f4-f3 ♔d5-e4 f3-f2 d3-d4 f2-f1♕ ♔e4-d5 ♕f1-b5+ ♔d5-d6 ♖h1-c1 d4-d5 ♕b5-b4+ ♔d6-e6 ♕b4-e7+) +M26/61 545)

Aug-30-19
Premium Chessgames Member
  agb2002: The black bishop can control important dark squares around the white king. This suggests 49... Bd4:

A) 50.Rxd7 Qg1+ 51.Kh3 Qf1+ 52.Bg2 (52. Kh4 Bf6#) 52... Qf5+ and mate next.

B) 50.Qb1 Qf2+ 51.Kh3 (51.Kh1 Qxf3#) 51... Qxf3 wins a piece (52.Rxd7 Qf5+ 53.Kg2 Qxd7).

C) 50.Qd1 Qxd1 51.Bxd1 Rxb7 wins.

D) 50.Qa2 Qg1+ 51.Kh3 Rxb7 52.Bxb7 g5

D.1) 53.Qg2 g4+ 54.Kh4 Kh6 55.Qc6+ (55.Qxg1 Bf6#; 55.Qf3 Qxh2#) 55... f6 56.h3 (56.Qg2 B(Q)e3 wins) 56... Qh2 57.Qg2(h1) Be3 wins.

D.2) 53.Bf3 g4+ 54.Bxg4 hxg4+ 55.Kxg4 Qxd3 - + [B].

E) 50.Qc2 Qg1+ like D.

Aug-30-19
Premium Chessgames Member
  agb2002: In my line D.1, 54... Qxg2 55.Bxg2 Kh6 was simpler.

Also, in my line D.2, 53... Qf1+ 54.Qg2 g4+ was far easier.

Aug-30-19
Premium Chessgames Member
  thegoodanarchist: I found the first move right away, and did not believe it could possibly be right. Oops.
Aug-30-19
Premium Chessgames Member
  patzer2: For today's Friday puzzle, I missed the strongest move 49...Bb4! +- (mate-in-26, Stockfish 10) and instead picked the second best move 49...Qd2+ which wins after 49...Qd2+ 50. Kh3 Qe1! -+ (-7.01 @ 50 ply, Stockfish 10).

I was surprised to find my alternative win 49...Qd2+ 50. Kh3 Qe1! -+ is identical to the position that occurred just two moves earlier in the actual game after 47...Qd2+ 48. Kh3 Qe1 -+. As Yogi Berra famously said "it's like deja vu all over again."

P.S.: So where did White go wrong? the losing move appears to be 46. Qb3? allowing 46...Qe3! -+ (-4.08 @ 31 ply, Stockfish 10). Instead, 46. h4 ⩱ to ∓ (-0.68 @ 31 ply, Stockfish 10) gives White drawing chances.

Aug-30-19  King.Arthur.Brazil: I saw the combination, as many. 49.♗d4 is the move to win. White has no way to survive after it. If 50.♕b1 (instead of ♕c2, after <goldfarbdj>), ♕f2+ 51.♔h3 ♕xf3 52.♖xd7 ♕f5+ 53. ♔g2 ♕xd7 and Black capture the ♗. The other possibility: 50.♖xd7 allowed ♕g1+ 51.♔h3 ♕f1+ 52.♗g2 ♕f5+ 53.♔h4 ♗f6# or 52...♕f5+ 53.g4 ♕xg4#. Therefore, eventhough some stupid can believe in the comunist speach about fire on Amazon, which is not more than a mediocric lie, today puzzle seems easy to me. Maybe I'm like pres. Bolsonaro is, a decent and correct person, chessmaster in politics.
Aug-30-19  devere: < patzer2: For today's Friday puzzle, I missed the strongest move 49...Bb4! +- (mate-in-26, Stockfish 10) and instead picked the second best move 49...Qd2+ which wins after 49...Qd2+ 50. Kh3 Qe1! -+ (-7.01 @ 50 ply, Stockfish 10).>

It would seem that 49...Qd2+ 50.Kh3 Qe1 51.Kg2 repeats the position. No harm done since 51...Bd4 would still win.

Aug-30-19
Premium Chessgames Member
  Breunor: I got this pretty quickly but only because I was told black to play and win. I'm sure I wouldn't have seen it without such a knowledge advantage.
Aug-30-19  FrogC: I got a Friday puzzle! Well, almost. I didn't look hard enough at White's defences after declining the sac.
Aug-30-19  NyP: Why do they call this variation "Agincourt" defense?
Aug-30-19  RandomVisitor: White had opportunties for better play at move 33:


click for larger view

Stockfish_19062709_x64_modern:

45/74 09:50 +0.33 <33.Re7> Bc3 34.R1e2 Qf6 35.Qd5 Bxb4 36.Nd7 Bxe7 37.Nxf6 Bxf6 38.Kg2 Kg7 39.Rf2 Rfd8 40.Qc4 Nd4 41.Be4 h5 42.Qa6 Ne6 43.h4 Rd7 44.Kh3 Rbd8 45.Rc2 Rd6 46.Qa2 Nd4 47.Rc1 Ne6 48.Qa5 R8d7 49.Kg2 Rd8 50.Rb1 Bd4 51.Kh3 R6d7 52.Qa2 Nc5 53.Qc4 Ne6 54.Bg2 Bf6 55.Rb7 Rxb7 56.Bxb7 Rd7

44/69 07:31 +0.37 <33.R3e2> Bg7 34.Nd7 Rbc8 35.Qd5 Qxd5 36.Bxd5 Rfd8 37.Bxf7 Rxd7 38.Re8+ Bf8 39.Rxc8 Rxf7+ 40.Kg2 Kg7 41.Rf1 Bd6 42.Rxf7+ Kxf7 43.Rc6 Ke6 44.Rb6 Nd4 45.b5 Kd5 46.Rb7 Kc5 47.b6 Nf5 48.Rf7 Kxb6 49.Rf6 Kc5 50.Rxg6 Be5 51.Kf2 Kd4 52.Ke2 Kd5 53.Kd2 Kc5 54.Ra6 Kd5 55.Ra5+ Ke6 56.Ke2 Bc3 57.Ra6+ Kd5 58.Kf3 Nd4+ 59.Kg4 Nc6 60.Kh5 Bd2 61.Ra2 Be3 62.Ra4 Ne5 63.Re4 Bc1 64.Re1 Nxd3 65.Rf1 Kd4 66.Rd1 Ke4

Aug-30-19  RandomVisitor: Black might have a better move 19:


click for larger view

Stockfish_19062709_x64_modern:

<35/50 05:00 -1.30 19...Rfc8> 20.Qd1 Kh7 21.Nf3 b5 22.Bb2 bxc4 23.bxc4 f6 24.N1d2 Nd8 25.a4 Nec6 26.Ba3 Rxb1 27.Nxb1 Rb8 28.Nh4 Ne6 29.Nd2 Nb4 30.Bxb4 Rxb4 31.Be4 f5 32.Bd5 Nc5 33.Ndf3 Nxa4 34.Nxe5 Bxe5 35.Rxe5 Nc3 36.Qd2 g5 37.Ng2 f4 38.Ne1 Rb1 39.Be4+ Kg7 40.Rxa5

Aug-30-19
Premium Chessgames Member
  Jimfromprovidence: I wondered if 51...Qg1+ instead of the text 51...g5 is still winning. It turns out it is.


click for larger view

Per Stockfish, the main line continues 52.Kf3 Qh1+ (trying to win the bishop by skewer) then 53.Qg2.


click for larger view

Black to play and win.

Aug-30-19  RandomVisitor: White has no attacking chances at move 42 and with the more exposed king and a passed pawn not advanced enough to create threats, he should play conservatively for the draw:


click for larger view

Stockfish_19062709_x64_modern:

<55/70 31:40 -0.13 42.Rb1 Rc8 43.Bd1> Rc7 44.Rb8 Qd6 45.Qe8 Qd5+ 46.Kh3 Qd7+ 47.Qxd7 Rxd7 48.Bc2 h5 49.Kg2 Re7 50.Kf1 Bd4 51.Rb4 Rd7 52.Kg2 Bc5 53.Rb5 Be3 54.Rb4 Kh6 55.Kf3 Bc5 56.Ra4 Rd6 57.Kg2 Kg7 58.Rc4 Be3 59.Re4 Bd2 60.Rc4 Rf6 61.Re4 Bc3 62.Rc4 Ba5 63.Ra4 Bb6 64.Rf4 Rd6 65.Bb3 Rxd3 66.Rxf7+ Kh6 67.Bc4 Rd2+ 68.Kh1 Bc5 69.Bb3 h4 70.gxh4 Bd6 71.Rd7 Rxh2+ 72.Kg1 Bf4 73.Bg8 Kh5 74.Rd5+ Kg4

Aug-30-19  TheaN: In this position Bd4 is almost a no-brainer. A 'free' move to enhance his position: White can't take on d7 because of the elegant Qg1+/f1+/f5+ manouver with a forced mate.

Whether or not Qc2 has to truly be considered is a matter of preference: Black has to be wary that Rb7 is still defended and does have to see he still has time for g5!, as after 50.Qc2 Qg1+ 51.Kh3 Rxb7 52.Bxb7 Qf1+? 53.Qg2 Qf5+ 54.g4! the queen's defending g4 suddenly (basically the point of Qc2, covering g2>g4) and White has the draw pretty much in hand after 54....Qxd3+ 55.Bf3 hxg4+ 56.Qxg4=: SF gives this -1.4 which is typical for opposite bishop pawn up endgames, but dead drawn. Instead, 52....g5 -+ does the same as the game line.

Aug-31-19
Premium Chessgames Member
  An Englishman: Good Evening: <Gilmoy>, knew it had to be something simple. Oh, well--looking forward to flubbing the rest of this week's puzzles.
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