Aug-26-20
 | | An Englishman: Good Evening: Queen en prise? No problem, Black can have it. Re8 en prise? No problem, Black can have it--29...Kh8; 30.Rh1 and White will mate on h7, h6 or h5. |
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| Aug-26-20 | | Cheapo by the Dozen: Ack. I missed the h-file mate threat. But I saw enough of the power of Re8/Be6+ to realize that Qb4 doesn't actually lose a piece, so I went with that winning-yet-incorrect move instead. |
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| Aug-26-20 | | Walter Glattke: I found a tricky way with 28.Rxe8 Rxe8 29.Be6+ Rxe6 30.Qd8 Re7!? 31.gxh7+ QKxh7 32.Qxf8 Ne3!? 33.Rh1+ Kg6 32.Rg1+ Kh6(h5) 33.Qh8# 29.-Kh8 30.Rh1 h6 32.Rxh6# |
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| Aug-26-20 | | Walter Glattke: 28.-Nxa5 29.Be6+ Kh8 30.Rh1 Qxb2+ 31.Bxb2 mate next |
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| Aug-26-20 | | Brenin: 28 Rxe8 solves White's en prise problems, and delivers mate or wins material, e.g. 28 ... Nxa5 29 Be6+ Kh8 30 Rh1 h6 31 Rxh6 mate (thanks to the Bc3 pinning the g pawn). |
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| Aug-26-20 | | newzild: The main line is obvious:
28. Rxe8 Nxa5
29. Be6+ Kh8
30. Rh1 and mates
Less obvious is:
28. Rxe8 Rxe8
...and now at first glance White can fork two bits with 29. Qa4. However, Black has the reply 29...Re3, hitting the Bh3. Therefore, <Walter Glattke> is probably on the right track. |
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| Aug-26-20 | | Brenin: After 28 ... Rxe8 I planned 29 Qa4, forking R and N, and maintaining the threat of Be6+. |
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| Aug-26-20 | | Delboy: Nobody is mentioning the possibility of 28. ... Rxe8 29. Qd8, the main point being that black cannot capture the queen due to 30. Be6+ Kh8 31. Rh1, mating. Black can then play several other 29th moves now, but in all white now seems to win material due to the multiple threats (Qxe8, Be6+, gxh7) |
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| Aug-26-20 | | agb2002: White has the bishop pair for a bishop, a knight and two pawns. Black threatens Nxa5 and Nxb2.
White can start an attack against the black king with 28.Rxe8: A) 28... Nxa5 29.Rxb8 Qxb8 30.Be6+ Kh8 31.Rh1 and mate in three. B) 28... Rxe8 29.Qa4 Re4 30.Be6+ Kh8 31.Qe8 Rxf4 32.Rh1 wins. |
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| Aug-26-20 | | Walter Glattke: I found some traps, after 28.Bxe6!? Rxe6 black could play Rxg6 or hxg6, continue with 29.gxh7+ Kh8, but the continuations are black advantage then. |
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| Aug-26-20 | | Walter Glattke: *28.Be6+ |
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| Aug-26-20 | | Predrag3141: <newzild> 28 Rxe8 Rxe8 29 Qa4 Re3 30 Be6+ Rxe6 is nothing for White to avoid. <Delboy> I avoided 28 Rxe8 Rxe8 29 Qd8 because of ... Qe7. But you're right, carrying out the threat of Be6+ -- after trading queens -- still forces Black to trade his rook for the bishop, giving white a strong passed pawn on e6. Tricky moves like 30 Be6+ and 30 Qxe8 lose though. |
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| Aug-26-20 | | mel gibson: There were so many threats.
I saw the first ply.
Stockfish 11 says mate in 20:
28. Rxe8
(28. Rxe8 (♖e1xe8 ♖b8xe8 ♕a5-a4 ♖e8-e4 ♗h3-e6+
♖e4xe6 d5xe6 ♕b7-c8 ♕a4-d7 ♕c8xd7 e6xd7 ♗f8-e7 ♖d1-e1 ♘c4-e5 f4xe5 h7xg6
e5xd6 ♗e7-g5+ ♗c3-d2 ♗g5-d8 ♖e1-e8+ ♔g8-f7 ♖e8xd8 ♔f7-e6 ♗d2-b4 g6-g5
♖d8-e8+ ♔e6xd7 ♖e8-e7+ ♔d7-c8 ♗b4-a5 g5-g4 d6-d7+ ♔c8-b7 d7-d8♕+ ♔b7-c6
♕d8-d3 a7-a6 ♖e7-c7+) +M20/66 293) |
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| Aug-26-20 | | TheaN: Actually got this one throughout. After <28.Rxe8!> White leaves his queen en prise, given that after 28....Nxa5 29.Be6+ Kh8 30.Rh1 Black has no defense against mate, as Pg7 is pinned, after 30....Qxb2+ 31.Bxb2 Nb3+ 32.axb3 h6 33.Rxh6#. <28....Rxe8> is slightly more involved, but my eye immediately fell upon the fork <29.Qa4 +-> and this simply works. The problem for Black is that the threat of Be6+ with Rh1 still exists, so defending both pieces with Rc8/Re4 doesn't work as White simply wins with 30.Be6+ and carnage. Pretty on point for a Wednesday, given the sac-accept combination and the relatively tricky Qa4. |
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| Aug-26-20 | | Eduardo Leon: The first move is reasonably easy to see: 28.♖xe8, threatening the deadly 29.♗e6+ ♔h8 30.♖h1 and mate next move. Thus black does not have enough time to take the queen with 28...♘xa5, and must play 28...♖xe8 instead. But then 29.♕a4 ♖e4 30.♕xc4 wins a minor piece, because 30...♖xc4 31.♗e6+ leads to the same mate that declining the queen was meant to prevent. |
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| Aug-26-20 | | Whitehat1963: Stock fish: 28...Rxe8 29. Be6+ Rxe6 30. gxh7+ Kh8 31. Qd8 Qe7 32. Qc8 Re4 33. b3 Nb6 34. Qf5 Nd7 35. a4 Re2 36. Bd4 Nf6 37. Rg1 Nxh7 38. Rh1 Re1+ 39. Rxe1 Qxe1+ 40. Kb2 Qe7 41. b4 Qe1 42. c3 with equality. |
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Aug-26-20
 | | chrisowen: Been a five plus no? |
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| Aug-26-20 | | Brenin: <Whitehat1963>: Why bother with 28 ... Rxe8? As several have pointed out earlier, after 28 ... Rxe8 White wins convincingly with 29 Qa4 or Qd8: he is already two pawns up, and the threats of Qxc4, Qxe8 and Be6+ mean significant further loss of material or mate for Black. |
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Aug-26-20
 | | fm avari viraf: < Englishman > Good analysis! |
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Aug-26-20
 | | Jimfromprovidence: JUST FYI...I was wondering how 28 Qa4 compared to the text. Someone beat me to the punch and ran CG's engine for one minute. here are the results. 1) +11.43 (26 ply) 28.Rxe8 Rxe8 29.Qa4 Re7
2) +10.22 (25 ply) 28.Qa4 Ne3 29.Rd3 Nxd5
Putting that analysis aside for a minute, interestingly, even after 28 Qa4 Rxe1 29 Rxe1, below, if black moves the knight he is still susceptible to the mating threat beginning with 30 Be6+, seeing 31 Rh1. So it looks like that knight is lost. 
click for larger view |
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| Aug-26-20 | | messachess: Nice little puzzle. |
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Kibitzing
sac: 28.Rxe8
