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| May-28-22 | | Brenin: It took a few minutes to see that 18 c4 forces 18 ... Bxa4 19 Qxa4 Rc8, leaving black's only two developed pieces tied to defending c6. Then 20 Rb1 threatens 22 Rxb6 axb6 23 a7, so Black starts to release his K-side pieces with 20 ... e5. White should play 21 Bxe5, with advantage, but instead we get 23 dxe5, allowing Black to equal with 23 ... Bc5. After 24 Rd1 Black plays 24 ... Qe7 instead of the obvious Qe6, and instead of the equally obvious 25 Bxc6+ White plays the pointless 25 h4. The next few moves and the result are equally hard to believe, and I wonder whether there is something wrong with the score. |
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| May-28-22 | | mel gibson: What a weird puzzle.
I didn't see that.
Stockfish 15 says:
18. c4
(18. c4 (c3-c4 ♗b5xa4 ♕d1xa4 ♖a8-c8 ♖f1-b1 e7-e5 ♗f4xe5 ♗f8-d6 ♗e5xg7 ♖h8-g8 ♗g7-h6 c6-c5
♕a4xd7+ ♔e8xd7 ♗g2-h3+ ♔d7-c7 ♗h3xc8 ♖g8xc8 ♖b1-d1 c5xd4 ♖d1xd4 ♔c7-d7
♗h6-f4 ♖c8-c6 ♗f4xd6 ♖c6xd6 ♖d4-h4 h7-h6 f2-f3 ♔d7-e7 ♔g1-f2 ♖d6-c6 ♔f2-e3
h6-h5 ♔e3-d4 ♖c6-c5 e2-e4 ♖c5-a5 f3-f4 ♔e7-f6 e4-e5+ ♔f6-g7 ♖h4xh5 ♖a5xa6
♖h5-g5+ ♔g7-f8 ♖g5-f5 ♔f8-e7 ♖f5-h5 ♖a6-a4 ♖h5-h8 b6-b5 ♖h8-b8 b5xc4 ♖b8-c8
c4-c3+ ♔d4xc3 ♖a4-a2 ♔c3-d4 ♖a2xh2 ♖c8-c7+ ♔e7-f8) +5.49/40 199) score for White +5.49 depth 40.
Also -
when Black resigns it's close to a draw.
25. Bh3
(♗g2-h3 ♖c8-d8 ♖d1xd8 ♖f8xd8 ♕a4xc6 f7-f6 e5xf6 ♕e7xf6 ♕c6-e4 ♗c5-d6 ♕e4-b7 ♗d6xf4
e3xf4 ♕f6-f7 ♕b7-c6 ♕f7-e8 ♗h3-e6+ ♔g8-h8 ♕c6-e4 b6-b5 c4-c5 ♖d8-c8 ♕e4-e3
♖c8-c6 f4-f5 ♖c6xa6 ♕e3-c3 ♕e8-a8 ♔g1-h2 ♕a8-e8 ♔h2-g2 ♕e8-c6+ f2-f3 ♕c6-e8
h4-h5 b5-b4 ♕c3xb4 ♕e8-d8 ♗e6-b3 ♖a6-c6 ♗b3-a4 ♖c6-c8 c5-c6 ♕d8-d5 ♕b4-e4
♕d5-d2+ ♔g2-h3 ♕d2-g5 ♗a4-b3 ♕g5xh5+ ♔h3-g2 ♕h5-e8 ♗b3-d5 a7-a5 ♕e4-c4
♖c8-c7 ♕c4-b5 ♕e8-d8 ♗d5-e4 ♖c7-a7 ♕b5-c5 ♕d8-e7 ♕c5-e3 ♖a7-a8 f5-f6 ♕e7xf6
♕e3-c5 ♖a8-c8 ♕c5xa5) +0.52/47 151 0-1
score for White +0.52 depth 47. |
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May-28-22
 | | al wazir: After 18. c4 Bxa4 19. Qxa4 Rc8 I wanted to play 20. d5, which accomplishes nothing. But I did see the key idea: find a way to play Bb8 (by sacrificing a piece if necessary) in order to play Bxa7, and then push the a-♙. |
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| May-28-22 | | Honey Blend: I would like to be bold and play 21. ♖xb6!? axb6 22. a7 exf4 23. ♗xc6 ♕xc6! 24. ♕xc6+ ♖xc6 25. a8=♕+ ♔d7 26. ♕b7+ ♔d6 27. gxf4 
click for larger viewNow the Black King has to worry about the incoming pawns and his KR and KB are still in their home squares. |
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| May-28-22 | | Besrqe: I don't think there's something wrong with the score. Here's the train of thought. First, Black was probably recognized by both players to be the stronger of the two. Second, they both knew White failed to find the knockout and lost the thread. All the while, White and/or Black may have been very low on time. If Black plays 22...Qe6, White can force a perpetual with Rd6. Black is up the exchange and thinks he's winning at this point, so wants to avoid a draw. Given the circumstances, he bluffs and puts the Q on e7 "threatening"...g5 and White reacts to it with h4. Black then castles signifying he got away and White plays one more move and either loses on time or resigns in disgust lol |
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May-28-22
 | | scormus: I immediately felt it must be 18 c4, but I didn't at first realise how strong it was.
Then it seemed to be fitting together well for W. But after 23 h4, I really didn't know what was going on. I've no idea why not 23 Bxc6+, nor why B resigned after 24 ... h6. W could still have played 24 Bxc6, but he may have wanted to prevent stop 24 .... Bxc2+. I agree with <Brenin> that W rather lost his way with 21 dxe5? I think he must have wanted to open the d-file, with Rd1 to follow. Perhaps W's thinking got scrambled if he realised dxe5 was a mistake. Maybe B's as well for some reason .... |
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| May-28-22 | | goodevans: <Besrqe: I don't think there's something wrong with the score. [...] If Black plays 22...Qe6, White can force a perpetual with Rd6.> Nice observation.
<... he bluffs and puts the Q on e7 "threatening"...g5 and White reacts to it with h4.> Here's where I lose faith in your theory. I don't think a strong player, as Black indeed was, would would play an obviously losing move as a bluff. What's so terrible about ...g5 that it trumps the idea of 23.Bxc6+ Kf8 24.Rd7? White was a pretty strong player too so I also don't think he'd passed up that opportunity. Other sites have this game with the same score but maybe they share the same incorrect source and Black did indeed play 22...Qe6. |
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| May-28-22 | | goodevans: If Black did indeed, as I believe, play 22...Qe6 then what was behind White's 23.h4? I would proffer that this is a pretty reasonable response to 22...Qe6, threatening Kh2 followed by Bh3. That would also explain 24.e3 (to prevent ...Bxf2) but maybe that was unnecessary and 24.Kh2 would have done better. |
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| May-28-22 | | Cellist: I saw the starting move 18.c4 and the following two moves as in the game, but I thought I could play Bb8 already on move 20. That does not work because of 20. ... b5, which is slightly better for Black (-0.7). Still, I am happy to have seen the general idea of a Saturday problem.
I am puzzled by the score of the game (0-1). So it must have been White who resigned or ran out of time or threw over the pieces or made an illegal move. The engine still rates W as having an advantage (+1.00) in the end position. |
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May-28-22
 | | chrisowen: I no pour juggle c4 fab gully no hark find uba hide affable pb paint breakthrough I afford pod dank about lo at c4 go? |
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May-28-22
 | | PawnSac: <mel gibson: What a weird puzzle.> yea, the whole idea..
White to play and lose [??!] is kinda weird.
that's easy! everyone can solve that!
Whoever finds the moves that lose the fastest wins the puzzle! lol
Find a forced self-mate and get a free CG membership! yes, 21.Bxe5 is better, but a GM passing up the winning 23.Bxc6+ for 23.h4? is really bizarre; almost defies explanation. |
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| May-28-22 | | saturn2: 18.c4 was worth a try. I had it up to the the Rb1 idea.
To the strange GM moves I add 16...Bc4.
Why did not he strive to develop his kingside and move the bishop again? |
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May-28-22
 | | Diocletian: My unpopular move, which I saw quickly, was 18. Rb4. One of my engines, Spike, also likes it beginning with half-pawn advantage and growing. |
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| May-28-22 | | Hercdon: It sounds like nobody here knows why white lost in what appears at worst to be a drawn position. How can we learn more about this game? |
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| May-28-22 | | Besrqe: <goodevans> Cherry picking one part of the theory makes it harder to see the idea and precisely why I used the phrase "train of thought". From the top: In the puzzle diagram, Black's position is on life support with more than half of his pieces comatose. Then shortly after, White, having seen an interesting tactic, completely misses the correct follow up. As far as this game goes, BOTH of these players were clearly having a poor day with cases of chess blindness/weak play already displayed. As I said in my prev note, after W wasn't able to produce a knockout after the sacrifice, both players knew it and probably felt Black was winning at that point; which influenced their move choices and mutual chess blindness from that point forward. As Fischer said, "One bad move leads to another". We've all seen cases where the lower rated player falls under the spell of the higher rated player as well. My main point of Black playing ...Qe7 is that he was avoiding ...Qe6 because he at least saw it runs into Rd6. I think Black saw he had the exchange and just wanted to castle and wasn't thinking about too much else at that point. That's what I meant by bluff, it was said tongue in cheek as neither player was seeing anything lmao. The part about ...g5 being seen as a threat was how White possibly took it and why he played h4 in response. It was clear he was deflated and out of gas at that point already and possibly low on the clock. In any case, I doubt the game score is in error. It's a mistake to think that a move or an idea that's so easy to see from the comfort of analysis can't be missed by, not just one, but both players in the heat of the moment OTB. Both players were playing inconsistently and inaccurately in multiple points in the game, not just the last few moves. |
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May-28-22
 | | corneliussulla: 23. B takes pawn wins |
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| May-28-22 | | agb2002: Black threatens Bxa4.
A quick scan yields lines like 18.d5 Bxa4 19.dxc6 Bxd1 20.cxd7+ Kd8 (20... Kxd7 21.Rxd1+ Ke6 22.Bxa8 wins a piece) 21.Rxd1 is winning (21... Rc8 22.dxc8=Q+ Kxc8 23.Bb7#). Or 19... Qxd1 20.Rxd1 Bxd1 21.c7 (threatens Bc6# and Bxa8) 21... e6 22.Bxa8 Kd7 23.Bc6+ Kc8 24.Bb7+ winning. However, Black has 21... e5 22.Bxa8 Kd7 23.Bxe5 Bd6. Another option is 18.c4 Bxa4 19.Qxa4, weakening the light squares on Black's queenside. However, after 19... Rc8 20.Rb1 (with the idea Rxb6 axb6 a7) Black has 20... Kd8 and the rook can control the promotion square because Bxc6 won't pin the queen although this might justify the exchange sacrifice. I don't know but I'd probably play 18.c4. |
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| May-28-22 | | raymondhow: When I varied from the game line with 21.Bxe5, thought I had missed, but apparently that's the solve. |
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| May-28-22 | | jes47: The engine rates the final position as +1.0, which doesn't merit a resignation. Why did black resign? Perhaps he ran out of time? This puzzle makes no sense. |
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| May-28-22 | | agb2002: I don't have any explanation for 23.h4 instead of the easy and overwhelming maneuver 23.Bxc6+ Kf8 24.Rd7 Qe8 25.Bd5 Be7 26.e6. |
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| May-28-22 | | raymondhow: < However, after 19... Rc8 20.Rb1 (with the idea Rxb6 axb6 a7) Black has 20... Kd8 and the rook can control the promotion square because Bxc6 won't pin the queen >
Apparently 21.c5! Would keep up the pressure, opening a new line to the king. Engine likes it anyway.. |
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| May-28-22 | | Chesgambit: Bxc6 g5 hxg5 hxg5 Bxg5 then Rd7 coming so he is holding and Bh3 alternative but otherwise you going to lose |
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| May-28-22 | | raymondhow: < The engine rates the final position as +1.0, which doesn't merit a resignation. Why did black resign? >
Actually the game score shows 0-1, so apparently it was white that resigned. But as you say, doesn't merit a resignation. |
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| May-28-22 | | mel gibson: <Also -
when Black resigns it's close to a draw. >I made a mistake there.
It should read -
Also -
when White resigns it's close to a draw. |
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| May-29-22 | | King.Arthur.Brazil: Surely, if White makes the move which directs him to lose quickly, this is a BAD move. The king (the trully born one in Brazilian lands, of course, lgs) suggests 18. ♖b4 ♖c8 19. c4 e6 20. cxb5
1.20...♗xb4 21. ♕a4 ♗e7 22. ♗xc6 ♖xc6 23. bxc6 ♕c8 24. c7+ ♔f8 25. ♕c6 f6 26. ♕b7 ♔f7 27. ♕xa7
2.20...cxb5? 21. ♖b2... take it easy, there is no hurry.
I guess my move is difficult and better than the one of the game. Where are you, fishouse? Find something better! |
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