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Later Kibitzing> |
| Jun-26-16 | | catlover: Thanks, <Penguincw>. Your knight sacrifice puzzle was fun. |
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| Jun-26-16 | | RandomVisitor: After 17...Nb6 18.Bxb6 Qxb6 19.Re1 Ra7 20.Re3 0-0 21.Rxe7 Rxe7 22.Qxe7 Bf5 black perhaps has weak compensation for being a pawn down |
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| Jun-26-16 | | AlicesKnight: I am with the above in perception - I like the use of the remaining knight - preventing castling, and then the final pretty sacrificial line-opener. |
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Jun-26-16
 | | agb2002: white has a bishop and a knight for the bishop pair. Black threatens 16... bxc3.
The typical/thematic move in these positions is 16.Nd5: A) 16... exd5 17.exd5 (threatening to exploit the pinned bishop) A.1) 17... Kf8 18.Bxg7+ Kxg7 19.Qxe7 and the threat 20.Rg3+ Kh6 21.Qg5(h4)# looks unstoppable (21... Nf8 22.Qxc7). A.2) 17... Nf8 18.Bxg7 Rg8 19.Bf6
A.2.a) 19... Rxg2 20.Qxg2 Bxf6 21.Re1+ Kd8 (21... Be7 22.Rde3 or 21... Kd7 22.Qg8 Ng6 23.Qxf7+ Be7 24.f5 wins decisve material in any case) 22.Qg8 Be7 23.Rde3 wins decisive material. A.2.b) 19... Bf5 20.Re3 Ng6 21.Re1 Ra7 22.Nd4 looks winnning. For example, 22... Be6 23.Bxe7 Nxe7 24.dxe6 f5 25.Qh5+ Kd8 26.Nxf5 + - [3P]. A.2.c) 19... Ng6 20.Re3 Kd8 (20... Nxf4 21.Rxe7+ and mate in two) 21.Bxe7 (perhaps 21.Rxe7 also works) 21... Nxe7 22.Re1 Re8 23.Nd4 Ra7 24.Nc6+ wins. A.3) 17... Nc5 18.Nxc5 dxc5 19.d6 (probably better than 19.Bxg7 Rg8 20.d6 Qb7 21.Bf6 Rxg2) 19... Qb7 (or 19... Qa7) 20.Bxc5 seems to end up two pawns ahead at least. A.4) 17... Ne5 18.fxe5 looks disastrous.
B) 16... Qb7 17.Nxe7 Kxe7 18.Bxg7 Rg8 19.Rg3 with an extra pawn and much better position. |
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Jun-26-16
| | agb2002: <Penguincw> This reminds me of a flawed but very interesting study by Reti
click for larger viewWhite to play and ... |
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| Jun-26-16 | | alshatranji: Very nice puzzle abg2002. I suppose it is flawed because Black's moves are not forced? That is, Black has to try to get a stalemate (the only chance), or else White would promote to Queen and win easily? |
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| Jun-26-16 | | Viennablue: AGB2002: ...and draw! When white underpromotes with 3.a8K (with same mechanics in mind as in penguin's puzzle), black plays 3...h6! When 3.a8Q then 3...h5!
Thx to both of you for the interesting puzzles! |
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| Jun-26-16 | | gofer: I "saw" that <16 Nd5> was "the move" and I realised that refusing the sacrifice lost a pawn, the position and therefore probably the match. 16 ... Qd8
17 Nxe7 Qxe7
18 Bxg7 Rg8
19 Bd4
click for larger viewSo, instead we have...
<16 Nd5 exd5>
<17 exd5 ...>
click for larger view...but of all the defensive moves I looked at, I did not even consider <17 ... f6>. Before I looked, I was wondering
whether black could simply castle king side, giving back the piece and then try to soldier on from there... ...so is that a full point or a nil point...?
Both my heart and head say <Nil Point, Monsieur!> |
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| Jun-26-16 | | scholes: After 16 Nd5, many moves by both the players were incorrect. So may be it was sacrifice based on intuition. Though 16 Nd5 is best move here |
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| Jun-26-16 | | Timi Timov: This puzzle is definitely much easier than the one of yesterday |
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| Jun-26-16 | | morfishine: Sort of lame for a Sunday. <16.Nd5> is so thematic its a given; some questionable moves follow but I really like White's last move <28.Ng5> that was really cool, made my day or saved my day |
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| Jun-26-16 | | mel gibson: DR4 64 bit shows that both players did not play accurately after
16 Nd5
but agrees with that answer to today's puzzle. |
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Jun-26-16
 | | Penguincw: < agb2002 >
Hehe, and that puzzle of yours reminds me of ANOTHER puzzle, similar to that, but I can't find it, and even if I did, I think that's enough unrelated puzzles for one POTD. Sometimes, I just display a random puzzle in the comment section when I have nothing else to say. :) Regarding the solution, yeah, looks like black will try to trap itself with stalemate, but white can promote to a knight and eventually checkmate the smothered king. 1.h6 Ka4 2.h7 b5 3.h8=N a5 4.Ng6 fxg6 5.f7 g5 6.f8=N g4 7.Nd7 f3 8.Nb6# 1-0. If black doesn't try to stalemate themselves, well, white just queens and wins. If black does it slowly, well (ex. Ka4, a6, b6, a5, b5), I don't know, I'll have to look at it via. an engine. However, since I knew what was going on, I got it. However, presented that OTB, I might not be able to see it. |
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| Jun-26-16 | | RandomVisitor: <agb2002>
click for larger viewKomodo-10-64bit: syzygy TB6
<+250.00/44 1.h6 Ka4 2.h7 a5 3.h8N> b6 4.Kb1 Kb5 5.Kc1 Kc5 6.Nxf7 Kd5 7.Ne5 Ke6 8.f7 Ke7 9.Nd7 Kxf7 10.Nxb6 Ke7 11.Kd2 Kd8 12.Na4 Kc7 13.Nc5 a4 14.Na6+ Kb7 15.Nxb4 |
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| Jun-26-16 | | RandomVisitor: 
click for larger viewKomodo-10-64bit:
<+0.34/43 16.Nd5 exd5 17.exd5 Nb6> 18.Bxb6 Qxb6 19.Re3 Ra7 20.Re1 0-0 21.Rxe7 Rxe7 22.Qxe7 Bf5 23.Qe2 h6 24.g4 Bd7 25.Qf3 a5 26.f5 Re8 27.Rxe8+ Bxe8 28.Qd1 f6 29.Qd4 Qa6 30.Qd3 Qa8 31.Nd4 Qxd5 32.Qb3 Qxb3 33.Nxb3 a4 34.Nd4 Bf7 35.b3 axb3 36.axb3 Bd5 37.Kb2 Kf7 38.c3 bxc3+ 39.Kxc3 Bg2 40.b4 Ke7 41.b5 Kd7 42.Ne6 Bh3 43.Kd3 Bxg4 44.Nxg7 Bh3 45.Kd4 Bf1 46.Nh5 Bxb5 |
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| Jun-26-16 | | YouRang: Well, I can say that 16.Nd5 is one of the moves I considered, and I noticed that it did open the e-file for potential attack purposes. I even guessed that it was probably the "solution move". But knowing all that isn't so helpful if you don't also know the "solution continuation", which I didn't. I probably would have played Bxg7 and hoped for the best. |
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Jun-26-16
| | agb2002: <alshatranji, Viennablue> Reti's idea was 1.h6 Ka4 2.h7 a5 3.h8=N b5 4.Ng6 fxg6 5.f7 g5 6.f8=N g4 7.Nd7 g3 8.Nb6(c5)#, as given by <Penguincw>. Unfortunately I don't remember exactly where was Black's least advanced b-pawn: if it was on b7, as displayed in my previous post it is still White's win, as <RandomVisitor>'s shows. However, if it was on b6, it wouldn't surprise me it is a draw. I do remember I was unable to find a victory the first time I saw it. |
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| Jun-26-16 | | RandomVisitor: <agb2002>If the pawn is on b6 it is a draw... black has a tempo because he does not need to play b6
click for larger viewKomodo-10-64bit:
<0.00/52 1.h6 Ka4 2.h7 a5 3.h8N Kb5> 4.Nxf7 Kc5 5.Kb1 Kd5 6.Nd8 Kd6 7.Kc1 Kd7 8.f7 Ke7 9.Kd2 a4 10.Nc6+ Kxf7 11.Nxb4 Ke6 12.Kc3 b5 13.Nc6 Kd5 14.Nd4 b4+ 15.Kd3 a3 16.bxa3 |
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| Jun-26-16 | | Al2009: A classical Velimirovic-style sac (Nd5), very usual in this kind of position, from Najdorf opening. Nothing new, Velimirovic played his first Nd5 more than 40 years ago, in 1972 Velimirovic vs Ljubojevic, 1972 |
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| Jun-26-16 | | YouRang: Well, in today's puzzle, checking with computer, it looks like Nd5 is clearly the best move. Still I couldn't say for sure if it wins, nor could I say for sure that any other move loses. So, while the position is interesting, it's kinda marginal as a puzzle. |
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| Jun-26-16 | | mruknowwho: I believe that anytime you can invade the king's 6th with the enemy king still in the center, even at the cost of a piece, it just about always pays off. I didn't actually find 16.Nd5. My idea was to play 16.Rg3. The threat of taking g7 in association with the possible Qh5 is a bit of a problem for Black. Still, I like the solution. |
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Jun-26-16
 | | Willber G: This should have been a Wednesday puzzle from move 28 then I might have got it. |
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| Jun-26-16 | | devere: It seems that White has no good move except for 16.Nd5!, which works quite nicely. And more surprising to me, Black has nothing better than 15...b4. It seems that Black's big mistake was 14...Nxd3?, instead of 0-0. |
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| Jun-26-16 | | RandomVisitor: A final look, after 15...b4
click for larger viewKomodo-10-64bit:
<+0.36/44 16.Nd5 exd5 17.exd5 Nb6> 18.Bxb6 Qxb6 19.Re1 Ra7 20.Re3 0-0 21.Rxe7 Rxe7 22.Qxe7 Bf5 23.Qe2 h6 24.g4 Bd7 25.f5 Re8 26.Qd2 f6 27.Rxe8+ Bxe8 28.Qd4 Qb5 29.Qd3 Qb6 30.Nd4 Qc5 31.c4 bxc3 32.Qxc3 Qxd5 33.Qb3 Qxb3 34.Nxb3 Bc6 35.Nd4 Bg2 36.a4 Kf7 37.Kc2 Bh3 38.b4 Ke7 39.a5 Kd7 40.Kc3 Kc7 41.Kc4 Bxg4 42.b5 Bh3 43.bxa6 Bf1+ 44.Kd5 Bxa6 45.Ne6+ Kd7 46.Nxg7 |
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| Jun-27-16 | | Smothered Mate: <agb2002>
In A.2.c), Stockfish evaluates your
20. ... Kd8 as much worse than Kf8.
The reason seems to be the g7 flight square.
After plugging in the continuation 21. Bxe7+ Nxe7 22. Re1 , which it evaluates as best anyway, and then going to 29 ply,
it evaluates 22. ... Bg4 and 22. ... Ra7
as just [+0.55] and [+0.68] respectively. |
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Kibitzing
sac: 16.Nd5