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| Mar-10-15 | | zb2cr: 33. ... Rxd4+! does it. The main line is 34. Bxd4, Qxe2+; 35. Kc3, Qe3+ (note the cross-pin); 36. Kc2, Bd3+; 37. Kd1, Qe2+ and White's Queen drops. |
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| Mar-10-15 | | diagonalley: woo-hoo! ... HBTM... although, with several other moves to consider, it took a while to settle upon the rook capture... perhaps this is more a "tuesday and a half" puzzle(?) ... (or maybe because, now i'm a year older, the brain cell has simply dropped a gear?!) |
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| Mar-10-15 | | morfishine: <33...Rxd4+> forces 34.Bxd4 and Black wins after either 34...Qxe2+ or 34...Qxd4+ ***** |
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| Mar-10-15 | | Cheapo by the Dozen: Material starts out dead even, and 33 ... Rxd4+ clearly wins material, the key line being 33 ... Rxd4+
34 Bxd4 Qxe2+
35 Kc3 Qe3+
That doesn't just win 2 bishops and pawn for the rook; it seems likely to snare White's king or queen as well. :) I'm not sure whether a quick mate is escapable, but this looks both like a guarantee of winning material and also the best way to continue the attack. |
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| Mar-10-15 | | Coriolis: This puzzle exemplifies an axiom from Naunblitzmanns's "Chess Concepts and Conundrums": (p.37)"...the King lives in a box that is, at most; 9 squares big. If a defended Queen can find a way into that box, there will be very little room to move." |
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| Mar-10-15 | | gofer: 33 ... Rxd4+ 34 Bxd4 Qxd4+ (Kc1/Kd1 Qxh1+  Kc2 Bxe2 ) 35 Bd3 Qf2+
36 Kd1 Bf4! (Kc1 Bf4+ 37 Kd1 Qd2#) 37 Qc2 Qf3+ 38 Qe2 Qxh1+ 39 Qd1 Qxd1+ 40 Kxd1 Bxd3 ~~~
Very Interesting! We have the "Qxd4+ camp" and the "Qxe2+ camp". I was in the former as I just see far more mating threats. But I think
both are equally good... ...but am I right?!??! |
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| Mar-10-15 | | morfishine: <gofer> You are right: both win. For 34...Qxd4+, 35.Bd3 fails to 35...Bf4+ and the Q+2B will overwhelm the Q+R (White's WSB will fall). On the other hand Taimanov's 34...Qxe2+ is decisive with Black again emerging with Q+2B vs Q+R; but one must see 35.Kc3 Qe3+
click for larger view |
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| Mar-10-15 | | cocker: Obvious first move, but not so 'easy' to see to the end of the king chase. |
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| Mar-10-15 | | wooden nickel: <gofer and morfishine>
After 33. ... Rxd4+ 34.Bxd4
I felt myself like Buridan’s donkey, threatening to starve, while finding himself halfway between two equally big and delicious piles of hay, the first hay pile being 34. ... Qxe2+ (as played in the game) the second hay pile being 34. ... Qxd4+!
Both "hay piles" are very tempting! |
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Mar-10-15
 | | Penguincw: Doesn't seem like a Tuesday puzzle to me. Pretty difficult to calculate, might be easier OTB. I got 33..Rxd4+ 34.Bxd4 Qxe2+.
If this were a real game, I'd probably play 33...Qxb1 34.Rxb1 Bxe2 35.Kxe2 Bxd4 36.Bxd4 Rxd4, and black is up a pawn. |
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| Mar-10-15 | | TheaN: Tuesday 10 March 2015 <33....?> The Pd4 and Be3 play as important shields against a devastating attack against the white king. It is a matter of analyzing whether breaking these apart will give a mate or material plus. In this situation, it does. Black breaks with <33....Rxd4+!>. It becomes evident quickly that declining this sac is no option at all: 34.Bd3? Rxd3+  and mate soon; 34.Kc3? Rd8+! 35.Bd4 Qxd4+ 36.Kc2 Qd2#; 34.Ke1? Qxh1+ is probably the most destructive. <34.Bxd4 Qxe2+ 35.Kc3 (Kc1 Bf4+ 36.Be3 Bxe3#) Qe3+!> the point, black abuses the newly created pin on the d4-bishop to lure the king away. Now white has a couple of options, but all lose: A) <36.Kc2 Bd3+ 37.Kb2 (Kd1 Qe2+ 38.Kc1 Bf4+ 39.Be3 Bxe3#) Bxd4+ 38.Ka3 (Ka2 Qd2+ 39.Ka3 Qa5#) Bxb1+ 39.Rxb1 Qc3 > and black is up queen and bishop for rook, with the mate hard to defend. B) <36.Kb4> though this seems to take space, the king doesn't have a lot of space <36....Qd2+!> first to take control over a3 <37.Ka3 (Bc3 Bxc3+ 38.Ka4 Bb5+ 39.Ka3 Bb4#) Qa5+ 38.Kb2 Bxd4+ 39.Kc1 (Kc2 Qc3+) Qc3+ 40.Kd1 (Qc2 Be3+ 41.Kd1 (Kb1 Qa1#) Qa1+ 42.Qb1/Qc1 QxQ#) Qf3+ 42.Kc1 (Ke1 Qe2#; Kc2/Kd2 Qe2+ 43.Kc1 Be3#) Qxh1+ 43.Kc2 Bd3+ > and black will go up a full queen. C) <36.Kb2> tries to stick to the queen in defense <36....Qd2+!> again! <37.Qc2> Ka3 Qa5+ leads to variation B <37....Bxd4+ 38.Kb1 Bd3 39.Rd1 Bxc2+ 40.Rxc2 Qd1+ 41.Rc1 (Ka2 Qxc2+ ) Qxb3#>. That should be all variations. |
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| Mar-10-15 | | TheaN: Detail error, in the Kb4 line after 41.Kb1, Qa1 is not checkmate because the bishop is on e3 and not d4... Bd3 is still a forced mate though. Also, playing 36....Qd2+ is not the most optimal in both variations B & C, but it does lead to forced mate. Taking with the queen or bishop right away is a quicker mate, because black can still threaten Qa5# with Qc3, even with the queen on the board. All the variations I posted however, are correct. |
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| Mar-10-15 | | CHESSTTCAMPS: Material is even, but the white king is caught is the center in a flimsy defensive arrangement with the white rook not participating. White threatens Qxe4, but black can break through immediately with 33...Rxd4+! 34.Bxd4 (K-moves Qxe3) Qe2+ and now: A) 35.Kc1 Bf4+ wins.
B) 35.Kc3 Qd3+ and now
B.1) 36.Kc2 Bd3+ 37.Kb2 Qxd4+ wins
B.2) 36.Kb2 Bxd4+ 37.Ka3 (Ka2 Qd2+ 38.Ka3 Qa5#) Bxc5+ 38.b4 (Ka4 Qb4#) Qc3+ 39.Qb3 (Ka2 Bc4+ wins) Bxb4+ 40.Ka4 (Ka2 Bc4 wins) Bb5+ 41.Qxb5 Qa3# B.3) 35.Kb4 Qd2+ 36.Ka3 (Bc3 Qxc3+ 37.Ka4 Bb5+ 38.Ka3 Qa5#) Qa5+ 37.Kb2 Bxd4+ 38.Kc1 Qc3+ 39.Qc2 (Kd1 Qf3+) Be3+ 40.Kd1 (Kb1 Bd3) Bd2+ 41.Qxd2 Qc1# Time for review... |
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| Mar-10-15 | | whiteshark: #9 <34... Qxe2+ 
click for larger view35. Kc3 Qe3+ 36. Kb4 Qxd4+ 37. Ka3 Qc3 38. Qe1 Qb2+ 39. Kb4 Bc4 40. Qd1 Qc3+ 41. Ka4 Bb5+ 42. Ka3 Qa5#> #12 <34... Qxd4+ 
click for larger view 35. Qd3 Bxd3 36. Bxd3 Qf2+ 37. Kc1 Qb2+ 38. Kd1 Bf4 39. Rh2 Qxh2 40. Bc4+ Kh8 41. Be2 Qg1+ 42. Kc2 Qc1+ 43. Kd3 Qd2+ 44. Kc4 Be5 45. h5 Qc3# <>> |
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| Mar-10-15 | | Lambda: One where you don't need to see to various mates in order to check the sacrifice is justified. 33... Rxd4+ and: 1) 34. Bd3 isn't adequately protected, taking it with queen or rook would obviously win. 34. Qd3 is silly. 2) 34. Kc3 and we'll obviously be happy with 34... Rd1+. 3) 34. Kc1 or 34. Ke1 can certainly be met by 34... Qxe3 which will win either way, white can't take the potentially hanging Ba6 in either case and has no problematic checks. 4) 34. Bxd4 Qxe2+ 35. Kc1 Bf4+ is immediately lethal. 5) 34. Bxd4 Qxe2+ 35. Kc3 Qe3+ will, at worst, leave us with BBP for R, with white having no threats, and we've got a raging attack on the king too. So just make the move, and work out the most efficient way to proceed when you see the reply, it's definitely winning. |
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| Mar-10-15 | | Chess Dad: I had 33... Rxd4+ 34. Bxd4 Qxd4+
From what I see here, both are winning, though after seeing the comments, I believe I like 34. Qxe2+ better. |
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| Mar-10-15 | | TheaN: The quest of Qxd4+ vs Qxe2+:
Objectively, Qxe2+ is better than Qxd4+: it mates three moves earlier. For a human however, finding all the mating variations otb can be hard, and black will just be content with winning. Looking at it like that, Qxd4+ might prevail. The reason for this is that the branch of variations after Qxd4+ is much shorter than after Qxe2+, where the white king partly escapes to the queen side. Pretty much all alternatives to 35.Bd3 lose more quickly than in the Qxe2 line: 35.Ke1 Bg3 36.Kf1 Qf2#
35.Kc1 Bf4+ 36.Kc2 Qd2#
35.Kc2 Qe4+ 36.Kc1 Qe3+ 37.Kc2 Qxe2+ 38.Kc1 Bf4#, or any order of moves 35.Qd3 Bxd3 is already won, Black can probably improve with Bf4+. After 35.Bd3 Bf4+:
36.Kc2 Bxd3+ 37.Kd1 Bxb1+ and mate soon (Bc2+! is probably the nicest finish though, if white captures). 36.Ke2/Ke1 Qe3+ 37.Kf1 (Kd1 Qd2#) Bxd3+ and soon mate. 36.Kd1 Bxd3 and white cannot really defend properly against the discovered check and the attack on his queen. |
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| Mar-10-15 | | Marmot PFL: The real trick is finding opponents who play moves like 20 Kd2. |
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Mar-10-15
 | | patzer2: Picked 34...Rxd4+! for my Tuesday puzzle solution as the line 35. Bxd4 Qxe2+ seems intuitively to be winning. One interesting aspect of this game is how White avoids castling and seeks safety for his King in the center, only to be blown away with this Rook exchange sacrifice in the middle of the board. |
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Mar-10-15
| | patzer2: <Marmot PFL> I have seen Masters avoid castling and get good play for it. However, this game demonstrates this strategy is not without risk (e.g. getting blown away by a center exchange sac). |
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Mar-10-15
 | | kevin86: Mate will come quickly, thank to the rook sac. |
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| Mar-10-15 | | LIzzard: <cocker> I'm with you - I saw the start and knew it was a good idea to sac the rook and go for either d4 or e2, but I the full finish for either took me a little while. In a game I'd have probably gone for it since, but may not have seen the whole chase |
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Mar-10-15
 | | thegoodanarchist: According to Wikipedia, "his original last name was Ujteleky". I suppose he changed it to Ujtelky because no one knew how to pronounce Ujteleky |
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| Mar-10-15 | | Dr. J: 34...Qxd4+ or 34...Qxe2+? Here's what I see so far as best play: <A> 34...Qxe2+ (following <TheaN> and <CHESTTCAMPS> with some corrections) 35 Kb4 Qd2+ 36 Ka3 Qa5+ 37 Kb2 Bxd4+ 38 Kc1 Qc3+ 39 Qc2 (39 Kd1? Qf3+ 40
Kc1 Qe3+ mates in 3 more moves) Be3+ 40 Kd1 (40 Kb1 Bd3 R vs. QBP) Be2+ 41 Kxe2 (41 Qxe2 Qc1#) Qxc2+ R vs. Q+P <B> 34...Qxd4+ 35 Kc2 (Seems best. Several commentators have demolished 35 Bd3.) Bxe2 36 Rh3 (is there anything better?) Qe4+ 37 Kc1 Qf4+ 38 Kc2 Qf5+ 0 vs. BBP Variation <B> seems easier, shorter, and more decisive to me. UPDATES <TheaN: Objectively, Qxe2+ is better than Qxd4+: it mates three moves earlier.> I still don't see how you get to a forced mate in at least two of the ...Qxe2+ variations, and several of the ...Qxd4+ variations, noted above. <Lambda: One where you don't need to see to various mates in order to check the sacrifice is justified...So just make the move, and work out the most efficient way to proceed when you see the reply, it's definitely winning.> Correct, and OTB that is exactly what I would do, but I don't think that's sufficient for a POTD. If so, then: NOT A TUESDAY PUZZLE |
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Mar-11-15
| | patzer2: Here's a breakout of the Tuesday 33...Rxd4+! solution with Fritz 14 for mate-in-ten: <33...Rxd4+! 34. Bxd4 Qxe2+ 0-1> White resigns in lieu of 35. Kc3 Qe3+! 36. Kb4 (36. Kb2 Bxd4+ 37. Ka3 Qc3 38. Qe1
Bxc5+ 39. Ka2 Qc2+ 40. Ka1 Bd4+ 41. Qc3 Bxc3#; 36. Kc2 Bd3+ ) 36... Qxd4+
37. Ka3 (37. Ka5 Qxc5+ 38. Ka4 Qb5+ 39. Ka3 Qa5#) 37... Qc3 38. Qe1 Qb2+ 39. Kb4 Bc4! 40. Qg3 a5+! 41. Kxa5 Qa3+ 42. Kb6 Qa6#. P.S.: While finding 33...Rxd4+! 34. Bxd54 Qxe2+ might be Tuesday level problem solving, it almost requires deep computer level calculating ability to find this entire 10 move mate. |
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Kibitzing
sac: 33...Rxd4+