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| Apr-06-17 | | Walter Glattke: White wins a pawn with 40.Ra7+ Kc8 41.Rxe7 Nxe7 42.Bxh4
40.Rb8 Kxa6? 41.b4 Rb7!? 42.b5+ Ka5 43.Be1+ Ka4 44.Ra8+ Ra7 45.Rxa7#
40.Rb8+ Kc6 41.b4 Kd7 42.Bc5  |
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| Apr-06-17 | | wtpy: Well I got the first move and perceived the right plan but the position had an air of derealization, like it wasn't a legitimate game, but contrived by someone; perhaps,since I am sleepy,I find my self in a hypnagogic state, which is just south of Louisiana. |
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| Apr-06-17 | | Cheapo by the Dozen: I didn't see anything better than Ra7+
I dismissed the game idea quickly because it wasn't going to lead to mate or pawn promotion in a straightforward way. The mill idea just didn't occur to me. |
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| Apr-06-17 | | Gilmoy: Not a windmill with 44.Rb6+, but outright mate(-in-1) with 44.b5+. Black seems to have no way to stop that. |
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| Apr-06-17 | | ChessHigherCat: It's amazing how many mating combinations begin with forcing the king to take a knight. |
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| Apr-06-17 | | AlicesKnight: I saw the idea of some sort of mating-net on the Q-side but got the sequence wrong. Is there a mate after 40.... Kc6? - I'm not convinced yet. |
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| Apr-06-17 | | Once: That's a slightly weird puzzle. The game continuation only works if Black complies. After 40. Rb8+ black should decline the poisoned knight with 40...Kc6 
click for larger viewWhite should win with his passed pawns and more active rook, but it's not a tactical position any more. Fritzie likes the plan of pushing the b pawn from here which seems good enough. Returning to our original position, I also toyed withe prosaic 40. Ra7+ Kc8 41. Rxe7 Nxe7 42. Bxh4. Fritzie thinks this wins too. So it seems that either 40. Ra7+ or 40. Rb8+ leads to a healthy white advantage, but after 40. Rb8+ we need to look at how white wins if Black plays the better defence of 40...Kc6 instead of the game continuation's 40...Kxa6. |
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| Apr-06-17 | | Lambda: Odd puzzle. Even though Rb8+ is the computer's choice here, I prefer Ra7+ as a practical human move because the two pawns up ending is obviously winning, while Rb8+ Kc6 is not at all easy to calculate. |
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| Apr-06-17 | | saturn2: 40 Ra7 jumped to my eye first. White has 3 connected pawns on the queenside. But black can win the h3 pawn. In the game line I do not understand 41..Ng2 |
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Apr-06-17
 | | Dionysius1: It's to prevent Be1 covering the a5 square in the mating net. |
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| Apr-06-17 | | ChessHigherCat: <Once: That's a slightly weird puzzle. The game continuation only works if Black complies. After 40. Rb8+ black should decline the poisoned knight with 40...Kc6> I think in the position in your diagram white plays 41. Bc5 attacking the rook. If Rd7, 42. Rb6#. If 41...Rf7, then b4 looks promising but it's 3:30 am and I think I'll try to "dream up" the solution rather than calculating... |
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| Apr-06-17 | | saturn2: <Dionysius1> If Be1 then the square a7 is not covered. |
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| Apr-06-17 | | ChessHigherCat: <Once: That's a slightly weird puzzle. The game continuation only works if Black complies. After 40. Rb8+ black should decline the poisoned knight with 40...Kc6> I think in the position in your diagram white plays 41. Bc5 attacking the rook. If Rd7, 42. Rb6#. If 41...Rf7, then b4 looks promising but it's 3:30 am and I think I'll try to "dream up" the solution rather than calculating. As I was nodding off I realized that 41...Rb7 is another option 42. Rc8+ forces Kd7 but that's as far I as got. |
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| Apr-06-17 | | bcks1234: <saturn2>I think 41...Ng2 is to prevent white threat of 42.b5+ Ka5 43.Be1 Ka4, 44.Ra8 Ra7,45.Rxa7# |
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| Apr-06-17 | | patzer2: For today's Thursday puzzle solution, I went for a skewer tactic which simplifies to a won endgame after 40. Ra7+ Kc8 41. Rxe7 Nxe7 42. Bxh4 when play might continue 42...Nf5 43. Be1 Nxh3 44. Nc5 Nf4 45. b4 Nd6 46. Kb3 (+4.19 @ 21 depth, Deep Fritz 15) The computers rate Black's combination with 40...Rb8+ as the strongest continuation after 40. Rb8+ Kc6 41. b4! (+5.06 2 22 depth, Deep Fritz 15.) After the game continuation 40...Kxa6, White's only winning move according to the computers is 41. b4! (19.45 @ 22 depth, Deep Fritz 15.) I missed that follow-up in my calculation of 40. Rb8+, and only saw 40. Rb8+ Kxc6 41. Rb6+ Ka7 42. Rxe6+ = (0.00 @ 22 depth, Deep Fritz 15.) In the final position, White threatens mate-in-three with 44. b5+ Ka5 45. Ra8+ Ra7 46. Rxa7#. Black can slow it down to mate-in-four with 43...Nd4+ 44. Bxd4 Nd5 45. b5+ Ka5 46. Ra8+ Ra7 47. Rxa7#. If 43...Nxc4 (diagram below),
click for larger viewWhite has a neat mate-in-two with 44.b5+ Ka5 45. Bb4#. P.S.: For a Black improvement, instead of 29...Nh5 allowing 30. Qd7+  (+0.62 @ 22 depth, Deep Fritz 15), the simplifying exchange 29...Ne4 30. Nxe4 Qxe4 = (0.00 @ 22 depth, Deep Fritz 15) appears to offer full equality. |
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| Apr-06-17 | | JimmyRockHound: This puzzle is actually from today's game of the day. And not from David v. Malakhov. |
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| Apr-06-17 | | saturn2: I see it now. Thanks Dionysius1 and bcks1234. |
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| Apr-06-17 | | stst: Now this is a little puzzle.
Except for the very first move: 40.Ra7+ I let the rest to unfold unto itself, seeing a few consequential moves later, but not through the end for a conclusive result.
Need the set to play over. |
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| Apr-06-17 | | agb2002: White has a bishop and a pawn for a knight.
Black threatens Kxa8 and Nxh3.
The first idea that comes to mind is 40.Ra7+ Kc6 41.Nb4+ Kd6 42.c5+ Ke5 43.Nc6+ winning decisive material. However Black has 40... Kc8. White can try to exploit the position of the black king with 40.Rb8+: A) 40... Kxa6 41.b4 (threatens mate in four)
A.1) 41... Ng2 (against Be1) 42.b5+ Ka5 43.Bc5 looks winning. For example, 43... Nge3+ 44.Kb3 Nxc4 (44... Nd4+ 45.Bxd4 wins) 45.Kxc4 followed by Ra8+. A.2) 41... Nd6 42.Ra8+ Kb7 43.Ra7+ and 44.Rxe7 + - [R+B+P vs 2n]. B) 40... Kc6 41.Rb6+ Kd7
B.1) 42.Bc5
B.1.a) 42... Re8 43.Rb7+
B.1.a.i) 43... Kc6 44.Rc7#.
B.1.a.ii) 43... Kc8 44.Rc7+ Kd8 45.b4 followed by b5, etc. looks advantageous for White. B.1.a.iii) Kd8 44.Bb6+ Kc8 45.Rc7+ Kd8 46.Rxg7+ wins another pawn but the one on h3 looks lost. B.1.b) 42... Rf7 43.Rb7+ Ke8 44.Nc7+
B.1.b.i) 44... Kd8 45.Nxe6+ Nxe6 (45... Ke8 46.Rxf7 Kxf7 47.Nxf4 + - [B+2P]) 46.Rxf7 + - [R+B+2P vs 2n]. B.1.b.ii) 44... Kd7 45.Nd5+ Ke8 46.Rxf7 Kxf7 47.Nxf4 + - [B+P]. B.2) 42.c5 (probably better than 42.Bc5)
B.2.a) 42... Nxh3 43.c6+
B.2.a.i) 43... Kc(d)8 44.Rb8#.
B.2.a.ii) 43... Ke8 44.Rb8+ Kf7 45.Bxh4 Nxh4 46.c7 Rxc7+ 47.Nxc7 + - [R vs n]. B.2.a.iii) 43... Kd6 44.c7+ Kd7 45.Rb8 Nd6 (45... Re8 46.Rxe8 wins) 46.Rd8+ Kc6 47.Rxd6+ Kxd6 48.c8=Q Nxf2 49.Qc5+ Kd7 50.Qxf2 + - [Q vs r+p]. B.2.b) 42... Nd5 43.c6+ Ke8 44.Bc5 and White seems to win the exchange (44... Rf7 45.Rb8#). |
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| Apr-06-17 | | gofer: I went for the attack!
<40 Rb8+! ...>
The knight is immune.
40 ... Kxa6
41 b4! ...
41 ... Rc7/Rd7/e5/Nxh3
42 b5+ Ka5
43 Be1+! Ka4
44 Ra8+ Ra7
45 Rxa7#
There are some delaying tactics...
41 ... Nd4+/Ne3
42 Bxd4/Bxd3 ...
42 ... Nd3
43 Kxd3 Rd7+
44 Kc3 Nd4
45 Bxd4 Rxd5
46 Kxd4 ...
...but the writing is on the wall...
<40 ... Kc6>
<41 b4 ...>
click for larger viewOkay decision time, white has started Pb2 on its march to b8 and there isn't much
black can do to stop it. One guess would be...
42 ... Nd6
43 b5+ Kd7
44 c5 ...
OMG that looks horrible...
click for larger view~~~
Okay, black died quickly. Sensible option! |
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Apr-06-17
 | | Jimfromprovidence: <patzer2> <The computers rate Black's combination with 40...Rb8+ as the strongest continuation after 40. Rb8+ Kc6 41. b4! (+5.06 2 22 depth, Deep Fritz 15.)>
click for larger view The main threat here looks like a mating net, 42 Rd8, seeing 43 b5+. As one example, if 41...Kd7 to try to stop that threat, then 42 Bc5, below, looks good. 
click for larger view |
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| Apr-06-17 | | takchess: This looks familiar. Does anyone know if this is in CT-Art? |
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| Apr-06-17 | | swclark25: I also went with 40)Ra7+ and appreciate the comments by <agb2002> and <patzer2> to explain Rb8+ |
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| Apr-06-17 | | Carlos0012358: Late to the party today. In short, it seems to me that 40....Kxa6 was black's undoing. As others have pointed out, 40....Kc6 is the best continuation for black who while still behind has an opportunity to make it a game even though white's material advantage will eventually prevail. |
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| Apr-06-17 | | Carlos0012358: <Lambda> <Odd puzzle. Even though Rb8+ is the computer's choice here, I prefer Ra7+ as a practical human move because the two pawns up ending is obviously winning, while Rb8+ Kc6 is not at all easy to calculate.> The problem with 40...Kxa6 is that is isolates the K in the A file at the mercy of the White K, R, B and the two pawns. Black will loose his R and will not be able to penetrate whites Q-side and eventually will be left playing with just one N against whites R and B. White will promote easily and end the game. While 40...Kc6 is by no means a winner, black is still unrecoverable behind both positionally and materialwise, but it will extend the game provided black plays well. |
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Kibitzing
sac: 40.Rb8+