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| Oct-17-14 | | plumbst: Difficult. Material is even.
In a pretty normal-looking position early in the game, White has a unexpected tactic. 14.Nxf7!
14...Qd7 15.Ng5 and Black has no good answer to the threat of Qe4. 14...Rxf7 15.Qe6! wins after 15...Ra7 16.Bxd5 or 15...Kf8 16.Qxd5 14...Kxf7 15.Qf3+ Ke8 (15...Ke6 16.Re1+) 16.Qxd5 Qxd5 17.Bxd5 Ra7 18.Be3 and White should win. |
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| Oct-17-14 | | diagonalley: 14.NxBP seemed the only move that was likely to achieve something... but OTB i probably wouldn't have given it much consideration... and anyway, i didn't foresee 14... KxN ...in all, maybe that's worth half a credit |
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| Oct-17-14 | | gofer: Hmmm, okay <CG> have reacted with vim to comments about yesterday's
POTD. Today's POTD <is> "difficult". My only clear advantage
move is <14 Nxf7> and even that isn't particularly clear as it
only seems to win a pawn...
<14 Nxf7 ...>
14 ... Rxf7
15 Qe6 Qd7/Qe7/Kf8 (Kh8 16 Qxf7  )
16 Bxd5
Now if the rook doesn't take then things are "very difficult",
the best I can find is...
<14 ... Kxf7>
<15 Qf3+ Ke8>
<16 Qxd5 Qxd5>
<17 Bxd5+ Ra7>
<18 Be3 ...>
click for larger viewWhite has won a pawn! Big deal. But there are a couple of
bonuses. White has connected rooks, black doesn't. White
can control the c file black can't. But white is also hoping
to play Be6 and then d5 killing black deader than dead. Not sure if this is even possible... ...but it's all I have! ~~~
I saw some of this, but to start on move 14 with Nxf7 you have to
see all the way to 20 Bg8, which is rather neat. It threatens Bxh7
and black can't play 20 ... Kf8 21 Bxh7 Kf7 trapping the bishop do
to 21 Rd8+! mating, so the rook retreat is necessary. But even then
it shouldn't be over...
...I wonder what our silicon friends make of white's chances after
<18 Be3>... Is white really <SO> dominant? |
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| Oct-17-14 | | morfishine: Exploitation of the h1-a8 diagonal and <e6> <14.Nxf7> 14...Kxf7 15.Qf3+ Ke8 16.Qxd5 Qxd5 17.Bxd5 Ra7 18.Be3 looks best *Black cannot play 14...Rxf7 due to 15.Qe6
***** |
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| Oct-17-14 | | anandrulez: I checked this puzzle first and saw nothing but some slow moves like Bg5 trying to pin the pawn but that doesn't work because of f6 . Then shut off the system and checked the puzzle in office and Nxf7 was simply logical and I spotted in split seconds . I guess sometimes you need to shut off and re-think on the position . It works for me sometimes . |
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| Oct-17-14 | | pedro99: This is a one star problem. White ends up a sound pawn up, no weaknesses, two bishops on an open board, all based on one well known tactical idea. |
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| Oct-17-14 | | cocker: Feeble resignation by Black; a pawn down and no immediate threats? |
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| Oct-17-14 | | Naugh: Would it be possible to play 14. Qe4 directly? |
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| Oct-17-14 | | Oxspawn: I cannot contribute to the end game. I ‘saw’ 14. Nxf7 in the sense that this is a POTD so you have to try something that looks completely bonkers, but I did not find the continuation and am still not clear why black cannot retake with the Rook (which seems to prevent 15. Qf3 – when black can play Rf5, and 15. Qe6 after which surely Ng4 is playable? )… My question is more elementary. In the opening why does white play 7. Bb5+? This seems to encourage black to develop the white squared bishop and then play the b pawn. Why not simply 7. Bc4? The game move looks to me like it loses a tempo for white. Is there a learning point here? |
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| Oct-17-14 | | stacase: Free Pawn and improved position. |
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| Oct-17-14 | | anandrulez: Agree its a one start problem . |
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| Oct-17-14 | | Abdel Irada: Fried liver never stales. :-D
∞ |
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| Oct-17-14 | | geeker: I saw 14 N:f7 right away (the position is really begging for it), but since it's a POTD, I had to spend a lot of time looking for something even stronger. So the net time spent was much more than for a one-star position. |
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| Oct-17-14 | | Nerwal: <In the opening why does white play 7. Bb5+? > On d7 the black bishop interferes with the queen's action along the d file, so winning back the pawn with ♘xd5 isn't possible right away (in the game Black had to give up the bishop pair to recover the pawn). Also manoeuvers like ♘bd7-b6xd5 become unavailable. To sum it up the bishop isn't developed on d7 but just misplaced. |
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| Oct-17-14 | | eblunt: <OXspawn> after 14..... Rxf7 15 Qe6 and black has a problem ... the Knight is now attacked twice, but it is now pinned to the diagonal , since if it moves, QxRf7+ . A strange sort of X-ray pin, since it's pinned between two White pieces. Black has absolutely no piece that can protect it along with the Queen. When the Knight gets taken by the White bishop , things get even worse, the loose other rook is under threat, and the pinned rook is double attacked and black cant protect both. |
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Oct-17-14
 | | Sally Simpson: After seeing 14.Nxf7 and the Qe6 idea you are left with a 6 and two 3's position. Your trick has given you a good advantage. The task being to see and rule out any counter wriggling by Black after 14.Nxf7. None.
After that there are too many Black choices to go through, you just have to have the confidence that all roads (including any diversions) should lead to Rome. Then all you need do is not be distracted by the scenery and reach Rome. Very possible that Tukmakov saw the Nxf7 idea here.
click for larger viewWhen he played 13.Qe2 using the loose b-pawn to manouver his Queen into a position to play Qe6. Of mild interest. My DB has a Rybka gamw. Rybka v Ax in 2007. Exact same position with Rybka to move. Instead of 13.Qe2 it played 13.Bd2. I prefer Tukmakov's move, no idea what Rybka saw to reject it. |
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| Oct-17-14 | | Once: <In the opening why does white play 7. Bb5+? > That's a good explanation by Nerwal. The opening books tell you to put pieces immediately where they want to go. Don't waste two moves putting a piece on a square it can get to in one move. And that is usually good advice. Usually. At first sight, 7. Bb5+ and 8. Bc4 look like beginner's moves. White moves his bishop twice to end up on a square that he could have reached in one. But black needs to play some moves too. In particular, black will want to target the d file and the d5/d4 pawns. The sequence that black really wants to play is Nbd7 followed by Nb6, when he has both knights and his queen attacking d5. In some lines, black might even want to play his bishop to b7, say after a6 and b5. 7. Bb5+ crosses all of these plans. Black can't easily play Nbd7 if his bishop is on d7. The Bd7 is blocking the black queen. This means that the bishop will have to move again, and so will give back the move that white spent. What's more, it will now take black two moves to park his bishop on b7. 7. Bb5+ "spends" an extra move by white, but in return black will have to spend another move getting the Bd7 out of the way and <two> extra moves if he wants to get his bishop to b7. There's another consideration. 7. Bc4 doesn't threaten anything so black has time to play a waiting move to see what white does. Black could play Nbd7 straight away or he could simply castle and wait for white to show his hand. These aren't massive gains. Fritzie finds only 0.2 of pawn between 7. Bb5+ and 7. Bc4. But every little helps, said the old lady as she peed into the sea. |
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| Oct-17-14 | | Oxspawn: Thank you
<Nerwal> “the bishop isn't developed on d7 but just misplaced.” That sums up my openings.and
<eblunt> after 14..... Rxf7 15 Qe6 if [the N] moves, QxRf7+ . “A strange sort of X-ray pin”. Yup I overlooked QxR7! That sums up my endings. |
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| Oct-17-14 | | Oxspawn: and thank you <Once> ...you get some good teach-ins on this site.... |
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| Oct-17-14 | | kevin86: The knight sac was just a loan. |
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| Oct-17-14 | | mistreaver: Friday. White to play. Difficult. 14?
The clear motive in the position is the geometry on the d5 and potential weakness of f7 and a8.
So
14 Nxf7 (!!)
If this beautiful shot works, it must have been pleasure to deliver it in a game.
A)
14 ... Kxf7 Probably the weaker capture.
15 Qf3+ Ke6 Or just take on d5 and white is winning
16 Re1+ and again white is winning.
B)
14 ... Rxf7
15 Qe6
and this has to be winning.
Time to check and see.
-----------------
Yep that is obvious. Kinda easy for friday. |
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| Oct-17-14 | | BOSTER: <Sally Simpson: Very possible that Tukmakov saw the Nxf7 idea,when he played 13.Qe2>. But in this pos.,where black was in rush to exchange his bishop for knight b1, black could play 13...Nc7,protecting b5 pawn and taking the knight from attack. "Sometimes the best way to move forward is to go back". So,now 14.Nxf7 doesn't work. |
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| Oct-17-14 | | M.Hassan: "Difficult"
White to play 14.?
White has Bishop pair for a Knighht and a Bishop.
14.Nxf7 Rxf7
15.Qe6 Qd7
16.Qxd5
White compensates his Knight and is a pawn up
16.........Qxd5
17.Bxd5 Ra7
18.Be3 Nd7
19.Bxf7+ Kxf7
Now White is up by a Rook+pawn for a Bishop.
If the Knight is not taken on move 14:
14..........Qd7
15.Qe4 e6
16.Ng5 Nc6
17.Qxe6+ Qxe6
18.Nxe6 Nce7
19.Nxf8 Kxf8
White is better in material |
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| Oct-17-14 | | TheBish: V Tukmakov vs J Sikora-Lerch, 1977 White to play (14.?) "Difficult", even material.
With very few targets (really only d5 and f7), I didn't find this too difficult at all. To find the solution over the board (OTB) in a tournament game with your clock ticking -- without anyone telling you there is a win in the position! -- would be another matter. 14. Nxf7! Rxf7
Alternatives are 14...Kxf7 15. Qf3+ Ke8 (both 15...Kg8 16. Qxd5+ and 15...Ke6 16. Re1+ Kd7 17. Qxd5+ are crushing) 16. Qxd5, winning a pawn with a strong position (16...Qxd5 17. Bxd5 Ra7 18. Be3 Rd7 19. Be6 Rd8 20. d5 and Black's king is still exposed with queens off the board). Also 14...Qd7 15. Ng5! with threats of 16. Qe6+ and 16. Qe4, attacking the now-pinned knight. 15. Qe6!
The point! The a2-g8 diagonal is opened up, and White will regain the piece with interest. White will play either Qxd5 or Bxd5 next (followed by taking the rook on f7), or if the knight moves, take the Rf7, winning the exchange and a pawn (15...Nc7 16. Qxf7+ Kh8 17. Be3). In the case of 15...Kh8 (worse is 15...Kf8? 16. Bxd5 with threats of Qxf7# and Bxa8), best is 16. Qxd5! Qxd5 17. Bxd5, forking both rooks. |
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Oct-18-14
| | Sally Simpson: Hi Boster,
click for larger viewYes 13...Nc7 is the hindsight move. 13...a6 is the natural move. I was just thinking perhaps Tukmakov spotted the shot when he played 13.Qe2. Cannot come up with a valid reason why Black played 11....Bxb1 here. 
click for larger viewSuch moves when played by even average players usually have a reason. All know the basic rules of thumb. Possibly he feared a Nc3 and Qf3 (aiming at the a8 Rook) after Black took the d5 pawn with the Knight. Either that or he adopted the time honoured strategy when playing v a stronger player. Chop wood at every opportunity. |
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