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| Jan-18-18 | | gofer: I am pretty sure I have Csom of this before...
<24 c5 ...>
White threatens winning one of the rooks with either cxd6 or Bc4+, so
black has no time to exchange pawns with bxc5... 24 ... Raxd3?
25 cxd6! Rxe3?
26 Rc8 +-
<24 ... Rdxd3>
At this point, I think there are probably multiple way to win, but
the safest seems to be...
25 Qe6+ Kf8
26 c6 ...
Black is scrambling to stop the promotion which looks possible,
but probably isn't.
But from memory, white plays the awesome queen sacrifice! <25 c6! ...>
25 ... Rxe3
26 c7 Qxd7
27 c8=Q+ Qxc8
28 Rxc8+ Kf7 (Bf8 is worse)
29 fxe3+ +-
I can't remember the rest...
~~~
Yep! |
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| Jan-18-18 | | cocker: White should have played 25 Qe6+. Black missed 25 ... Rxe3, which limits his loss to an exchange. |
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| Jan-18-18 | | patzer2: <vinidivici: Csom Nonchalantly Evening, it should be.
Neglecting all kind of threats from the opponent, that must be a big guts out there.> A good alternative pun! My thought was "It's no time to Planinc!" For today's Thursday puzzle (24. ?), White faces a desperate situation where his Bishop is pinned and he can do nothing to avoid losing it. So, with the thought "it's no time to panic," I looked for a desperate game saving idea and came up with 24. c5! Rdxd3 25. c6 ± to +- (+1.20 @ 31 ply, Stockfish 8). However, like White in this game, it's possible I missed a stronger second move follow-up. Instead of sacrificing the White Queen and going for a difficult endgame with 25. c6 Rxe3 26. c7 Qxc7! 27. Rxc7 Red3 28. Rc8+ Kf7 29. d8=Q Rxd8 30. Rxd8 Rb3 31. Rdd1 Rxb4 32. Rb1 Rxb1 33. Rxb1 Bd4 34. Kf1 Bc5 ± to +- (+1.51 @ 42 ply, Stockfish 8), White ensures a near winning position by saving the White Queen and opening up the position to win the Black Queen with a skewer tactic via 25. Qe6+ Kf8 26. cxb6! Rxd7 27. b7 Rxb7 28. Rfd1 Bd4 29. Rc8 Ra8 30. Rxd8 Rxd8 31. Qc4 +- (+3.09 @ 37 ply, Stockfish 8). However, despite the higher computer evaluation for 25. Qe6+, Black may be able to build a fortress after 25. Qe6+ and make the win almost as difficult as finding one after 25. c6. So, from my human perspective, 25. c6 ± to +- is a good practical choice. P.S. For a Black improvement, 25...Rxe3 ± (+1.51 @ 42 ply, stockfish 8)
puts up much more resistance than the game reply 25...Rdc3? allowing 26. Rfd1 +- (+2.80 @ 32 ply, Stockfish 8) or the even stronger possibility 25...Rdc3? 26. Qd2 +- (+8.25 @ 39 ply, Stockfish 8). Black's losing move appears to be 23...Rd6? allowing today's Thursday puzzle solution 24. c5! +- (+2.85 @ 35 ply, Stockfish 8). Instead, 23...Qxd7 24. Bf5! Rxe3 25. Bxd7 Rd3 26. Bb5 Bh6 ± (+0.64 @ 35 ply, Stockfish 8) sacrifices a pawn to give good reasonably good drawing chances. |
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| Jan-18-18 | | wooden nickel: <patzer2: For today's Thursday puzzle (24. ?), White faces a desperate situation where his Bishop is pinned and he can do nothing to avoid losing it.>
that's what I thought too… but
24.Rcd1 Qxd7 25.Bf5 Rxe3 26.Bxd7 Red3 27.Be6+ Kf8 28.Bd5
click for larger view |
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| Jan-18-18 | | agb2002: White has two extra pawns.
Black threatens Raxd6 and Qxd7.
The c-pawn blocks Rc8. Therefore 24.c5:
A) 24... Rdxd3 25.Qe6+
A.1) 25... Kf8 26.cxb6
A.1.a) 26... Rxd7 27.b7
A.1.a.i) 27... Rxb7 28.Rc8 wins the queen for rook and bishop at least. A.1.a.ii) 27... Rc3 28.Rxc3 Bxc3 29.Qxd7 wins an exchange at least. A.1.a.iii) 27... Bc3 28.Qxd7 as above.
A.1.b) 26... Qxd7 27.Rc8+ Qxc8 28.Qxc8+ Kf7 29.b7 wins decisive material. A.1.c) 26... Ra8 27.b7 followed by Rc8 wins.
A.1.d) 26... Rac3 27.b7
A.1.d.i) 27... Rxd7 28.Qxd7 as above.
A.1.d.ii) 27... Qc7 28.Rxc3 Bxc3 (29... Rxc3 30.Qd5 Qd8 31.b8=Q Qxb8 32.d8=Q+ + -) 29.Qc4 Qxc4 30.b8=Q+ Kf7 31.d8=Q wins decisive material. A.2) 25... Kf8 26.c6
A.2.a) 26... Qc7 27.Rfd1 Rxd1 28.Rxd1 Ra8 29.b5 leaves Black completely tied up but I'm not sure whether this is enough to win. A.2.b) 26... Ra7 27.Qc4 and the double threat c7 and Qxd3 seems to win an exchange at least. A.2.c) 26... Rd6 27.Qxd6 exd6 28.c7 also wins an exchange at least. A.3) 25... Kh8 26.cxb6 looks similar to A.1.
B) 24... Raxd3 25.cxd6
B.1) 25... Rxe3 26.Rc8 wins decisive material.
B.2) 25... Rxd6 26.Rc8 as above.
B.3) 25... Qxd7 26.Qxd3 + - [2R+P vs b].
C) 24... Rxd7 (or 24... bxc5, or 24... Bd4) 25.Bc4+ followed by 26.Qxa3 wins. |
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| Jan-18-18 | | malt: Was not sure to go for 24.Rcd1,24.Rfd1
or <24.c5> Rd:d3 25.Qe6+ Kf8 26.c6 o.k. but what happens if 24...Ra:d3 25.cd6 (the rook has access to c8) 25...R:e3
26.Rc8 |
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| Jan-18-18 | | morfishine: Very imaginative and exciting play by White, but <25.Qe6+> followed by <26.c6> is stronger, more straightforward & wins outright ***** |
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| Jan-18-18 | | malt: My post looks dwarfed to <agb2002>
homework |
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| Jan-18-18 | | njchess: Got this because it seemed c5 was the ONLY move that helped in any way. It appeared to me that White would be left with a ♖ vs ♗ ending with White also having a slight advantage in pawn structure. Advantage White. I wonder if it would have been better for Black to play 24. c5 bxc 25. bxc ♖xd7 26. c6 ♖c7. |
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| Jan-18-18 | | patzer2: <Wooden Nickle> Thanks! You're correct. If White wants to save his Bishop, instead of winning with 24. c5! +- (+3.09 @ 37 ply, Stockfish 8), then he can play 24. Rcd1 when Stockfish 8 gives best play as 24. Rcd1 Qxd7 25. Bf5! (diagram below)
click for larger view25...Rxd1 26. Be6+ Kf8 27. Bxd7 Rxf1+ 28. Kxf1 Rxe3 29. fxe3 ⩲ (+0.35 @ 39 ply, Stockfish 8) or 25...Rxe3 26.Bxd7 Red3 27.Bg4 ⩲ (+0.36 @ 34 ply, Stockfish 8). P.S.: So I guess I should have said for today's Thursday puzzle (24. ?) White faces a desperate situation where his pinned Bishop is threatened and his best option is to sacrifice it with 24. c5! Rdxd3 25. Qe6+ +-. |
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| Jan-18-18 | | Cheapo by the Dozen: Excelsior! (Sort of)
Great puzzle.
I solved it. :) |
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| Jan-18-18 | | NBZ: Same solution as everybody else: c5 and if Raxd3 cxd6 Rxe3 Rc8, and if Rdxd3 Qe6+ and c6. |
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| Jan-18-18 | | Marmot PFL: White can give up the bishop and even the queen to get a passed pawn through. |
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| Jan-18-18 | | Carlos0012358: <agb2002> Your depth of analysis is remarkable. How long do you spend on it? Thanks for the great work. |
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| Jan-18-18 | | Carlos0012358: Looks to me that 25.Qe6+ wins the black Queen and is better that 25.c6 in the long run. Protecting the d7 pawn at all costs is not the best strategy. |
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| Jan-18-18 | | kwid: Jan-18-18
<morfishine:>< Very imaginative and exciting play by White, but <25.Qe6+> followed by <26.c6> is stronger, more straightforward & wins outright
*****>
White played c6 suggesting unfamiliarity with this position which IMO is very difficult to solve with time pressure. The move c6 leads to a draw:
24. c5 Rdxd3 25. c6 Rxe3 26. c7 Qxc7 27. Rxc7 Red3 28. Rc8+ Kf7 29. d8=Q Rxd8 30. Rxd8 Rb3 31. Rdd1 Rxb4
click for larger viewPlaying instead 25. Qe6+ Kf8 26. c6 Qc7 27. Rcd1 Rxd1 28. Rxd1 Ra8 would lead also to a complex endgame: 
click for larger view<straightforward & wins outright *****> would take considerable skill when confronted in an OTB encounter forcing black to surrender. |
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| Jan-18-18 | | morfishine: <kwid> Yes, I looked at it more thoroughly later and wished I had done that before posting |
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| Jan-18-18 | | cormier: 1) +0.20 (34 ply) 3...f5 4.g3 c5 5.d5 Nf6 6.Nc3 O-O 7.Bg2 d6 8.O-O Na6 9.h3 Nc7 10.Qd3 Bd7 11.a4 Qe8 12.Bd2 Na6 13.Ng5 Nb4 14.Qb1 h6 15.Ne6 Bxe6 16.dxe6 Qc8 17.Nd5 Qxe6 18.Nc7 Qxe2 19.Bxb4 cxb4 20.Nxa8 Rxa8 21.a5 Qxc4 2) +0.22 (34 ply) 3...Nf6 4.Nc3
60.0 minute analysis by Stockfish 8 |
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| Jan-18-18 | | cormier: 1) +0.41 (31 ply) 4.d5 f5 5.g3 Nf6 6.Nc3 O-O 7.Bg2 d6 8.O-O Na6 9.Re1 Nc7 10.a4 Rb8 11.e4 Nxe4 12.Nxe4 fxe4 13.Rxe4 Bf5 14.Re1 e5 2) +0.24 (31 ply) 4.e4 Qa5+ 5.Nc3 Nf6 6.Bd2 cxd4 7.Nxd4 d6 8.Be2 Nc6 9.Nb3 Qd8 10.O-O O-O 11.Be3 b6 12.f3 3) =0.00 (30 ply) 4.Nc3 cxd4 5.Nxd4 Nc6 6.Nxc6 dxc6 7.Qxd8+ Kxd8 8.e4 Kc7 9.Be3 e5 4) -0.03 (30 ply) 4.e3 cxd4 5.exd4 Nf6 6.d5 O-O 7.Nc3 e6 8.Be2 exd5 9.cxd5 d6 10.O-O Nbd7 11.Re1 Re8 10.0 minute analysis by Stockfish 8 |
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| Jan-18-18 | | cormier: 1) +0.35 (36 ply) 7...O-O 8.Be2 d6 9.O-O Bd7 10.Qd2 Nxd4 11.Bxd4 Bc6 12.Qc2 Qc8 13.Rad1 Qe6 14.Bd3 Nh5 15.Bxg7 Kxg7 16.Rfe1 Qe5 17.g3 Nf6 18.Nd5 Bd7 19.f4 Qd4+ 20.Qf2 Qxf2+ 21.Kxf2 Nxd5 22.cxd5 Rac8 23.a3 f6 24.Kf3 Kf7 25.Rc1 e5 26.dxe6+ Kxe6 27.Rxc8 60.0 minute analysis by Stockfish 8 |
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| Jan-18-18 | | Grandma Sturleigh: Definitely more than medium difficulty, and very tough for a Thursday. |
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| Jan-18-18 | | agb2002: <Carlos0012358: <agb2002> Your depth of analysis is remarkable.> Thank you! I wish the engines had a similar opinion of its quality... <How long do you spend on it?> I don't know, about half dozen breaks between breakfast and lunch time. |
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| Jan-19-18 | | Moszkowski012273: 25.Qe6+ followed by 26.cxb6! is stronger. |
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| Jun-02-19 | | cunctatorg: Wooooowwww!! A Queen's and Bishop's (for "just" a Rook) sacrifice in modern (namely at the Karpov and Korchnoi era) chess!! Hard to believe it... |
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Feb-12-21
 | | louispaulsen88888888: The CS is pronounced like CH. so it wouldn’t sound much like “Some Enchanted Evening”. But in general, you do come up with some good ones. |
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Kibitzing
sac: 24.c5