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| Sep-01-10 | | David2009: K Landa vs M Leon Hoyos, 2008 Black 30...? 30...Bc4 31 R1xc4 (to protect the Rc7) Be1+ 32 Kxe1 Qxb3 33 Bd1 Qb8 34 Nc5 Nxc5 35 R4xc5. White has BB for Q and a R on the 7th, and is also threatening the desperado attach f5!?, but this should not be enough.
Time to check:
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I found the first move, but little else. I missed the best White defence (31 Qe3! limiting immediate losses to the exchange) and also after 31 R1xc4 Be1+ 32 Kxe1 Qxb3 33 Bd1 the best continuation of the Black attack, which is Qxg3+! Crafty End Game Trainer check of the position at move 30:
click for larger view
http://www.chessvideos.tv/endgame-t...
(Landa vs Hoyos 2008, 30?). See if you can use this free software to save the game for White (30 a3 was played in the game). Enjoy! |
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| Sep-01-10 | | sethoflagos: It looks very much as if white has had a senior moment with 30 a3? losing the exchange after a fairly obvious 30..Bc4 30 Qc2 followed by b3 and Nb2 would have extracted the WN and put the black bishops on the back foot. |
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| Sep-01-10 | | Marmot PFL: Of course the move is 30...Bc4 with many threats - Bxb3, Qxc7, and if 31 Rxc4 Be1+ |
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| Sep-01-10 | | Patriot: 30...Bc4 fits nicely, attacking the queen and cutting off the defense to the c7-rook. I couldn't find a good refute to this. White's reply, 31.Qe3, is the dual-hanging piece theme again. That is, when pieces of equal value from both sides are hanging, ignore it! It's just that white loses the exchange. |
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| Sep-01-10 | | agb2002: Thw material is even.
White threatens 31.axb4 and eventually Bxd5 exd5 Qxd5 and e6. The black queen x-rays her defenseless white colleague and Black's LSB can cut the connection between both white rooks if it moves to c4. Therefore, 30... Bc4, with the menace 31... Be1+: A) 31.Qc2 Qxc7
A.1) 32.axb4 Qb7 - + [R vs B] (32... axb4 33.b3 Qa5 34.Ra1 Ba6 35.Nb6 Qb5 36.Nxa8 Rxa8 - /+ [N+P vs B]). A.2) 32.b3 Bxa3 33.Ra1 Bb4 34.bxc4 Rac8 - + [R+P vs B]. B) 31.Qd1 Qxc7 looks similar to A.
C) 31.R4(7)xc4 Be1+ and 32... Qxb3 - + [Q vs 2B]. |
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Sep-01-10
 | | OBIT: <mrsaturdaypants>Sometimes the inferior moves produce richer variations, and the possibilities after 30...Bc6 illustrate this nicely. In your extension to <Phony Benoni's> suggestion, 30...Bc6 31 axb4 Qxc7 32 b5 Rab8 33 Rxc6 Qxc6 34 bxc6 Rxb3 35 cxd7 Rb4, 36 Bb6 Rxd7 37 b3, Black has the better endgame after 37...Rxb3 38. Nc5 Rxb6 39. Nxd7 Ra6. A rook by himself pretty much offsets B+N (generally speaking, bishop and knight don't coordinate too well - better to have two bishops or two knights), and here Black also has two extra pawns, while White's bishop doesn't appear to be too useful against this pawn structure. I do like <Artsemthon's> idea: 33. Bd1! This move appears to leave White with a definite advantage. In fact, it looks to me like the *only* move in the position that gives White a clear advantage. By the way, this is why you have to be careful when a computer claims a winning advantage after a move, e.g. when <Patzer2's> computer gave "32. b5  ". Even if the assessment is correct, sometimes it is based on later moves that we humans with our feeble brains would have a hard time finding. The bot, of course, doesn't know the difference between an obvious move and a subtle one. |
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| Sep-01-10 | | kevin86: Too tuff 4 me. I guess I'll stick to Othello and Checkers... |
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| Sep-01-10 | | jaykingmusic: robed.bishop is right about forcing a mate by 37. f6 instead of fxg6.
Also a draw on 39. Qf6 leading to a perpetual. I can't believe Konstantin is a GM. |
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Sep-01-10
 | | scormus: Not the easiest of Wednesdays. 30 ... Bc4 was easy enough to find but what about W's counterplay 31 Qe3 Qxc7 32 axb4. I thought 32 ... Qb8 looked a bit passive, and rather preferred .... axb4. After 33 b3 Qb8 34 Nb6 Ra2+ 35 Kg1 Ba6 36 Nxd7 Rxd7 B has R+p for B and it looks safe. Lots of ways it could have gone wrong, eg 33 ... Qa5? 34 Ra1, and probably some more I missed. |
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| Sep-01-10 | | fischer2009: @ JAYKINGMUSIC
Konstantin is a GM n 2613 means he is quite a strong one and i would say TOO strong 2 miss such a mate.
37.f6 has ne4+ followed by Qf8 forcing the exchange of queens or another exchange of pieces. criticism is fine.BUT PLZ think abt whom u r criticising and den do it. |
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| Sep-01-10 | | YouRang: Those old tactical exercise books paid off today. A tactic that I remember being impressed by (because it is often not obvious to the victim) is interference of the defender. And this tactic often pops up with a pair of rooks (or a rook and a queen), and especially when they are separated by some distance -- as in today's puzzle. It comes in a couple flavors:
1. Attack both of the mutually defended pieces, and then stick a guarded but lesser-valued piece between them. 2. Attack one of the defended pieces, and then stick a guarded but lesser-valued piece between which carries its own threat (such as this case, where the interfering bishop attacks the queen). Good interference puzzle. |
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| Sep-01-10 | | TheBish: K Landa vs M Leon Hoyos, 2008 Black to play (30...?) "Medium/Easy"
Looks like Black can win an exchange with 30...Bc4!. Not too tough, but instructive. |
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| Sep-01-10 | | mrsaturdaypants: Thanks, OBIT. Much richer than I appreciated at first. |
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Sep-01-10
 | | OhioChessFan: I really don't understand 32...Qb8 Why not the simple axb4? |
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Sep-01-10
| | OhioChessFan: <Outplayer: why not 37.f6? > White is done at this point anyway, but 37...Nd3+ and then Qf8 which ends White's last ditch attack. |
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| Sep-01-10 | | YouRang: <OhioChessFan: I really don't understand 32...Qb8 Why not the simple axb4?> Not much difference. He probably preferred to keep his bishop rather than exchange it for the "bad" (on the rim) knight. So, 32...Qb8 unpins the bishop so that white can't win it with 33.b3. Of course, once white takes the bishop with bxc4, black gets the knight with ...Rxa4. |
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| Sep-01-10 | | YouRang: My last paragraph above was was poorly presented:
The first sentence refers to the 32...Qb8 line, where 33.b3 can be answered by retreating the bishop, because it isn't pinned by the rook against the queen. The second sentence refers to the proposed 32...axb4 line, where white has 33.b3 (pinning the bishop) 33...Qb8 34.bxc4 Rxa4, exchanging B for N. |
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| Sep-01-10 | | CHESSTTCAMPS: In this middlegame position, material is even and almost all action is on the queenside. White appears to have control of the c-file, the only open file on the board, but in fact, white has sent a rook to the 7th without proper support. The undefended Qb3 suggests that black can exploit the lineup of queens on the b-file by discovered check, i.e. Bc6 or Bc4 to directly attack the Rc7 and indirectly attack the Qb3. But which one? At first glance, 30...Bc4 looks stronger, but 31.Qe3! Qxc7 32.hxg4 hxg4 33.b3 and with the threat of Nb2 or Nb7, black can't maintain the material advantage, e.g. 33...Qb7 34.Rxc4. However, after 30...Bc6! White must lose at least an exchange A) 31.R1xc6? Be1+! 32.Kxe1 Qxb3 33.Bd1 (Nc3 Qxb2) Qxg3+ wins easily (Q+P for 2 Bs) B) 31.R7xc6? Be1+ 33.Rxe1 (Kxe1 Qxb3 34.Bd1 Qxg3+ is similar to A) Qxb3 34.Bd1 Qb7 35.Rc2 Rac8 and the material advantage plus control of c-file should win for black. C) 31.Qd1 Qxc7 32.axb4 Bxa4 and black wins a whole rook. D) 31.Qc2 Qxc7 32.axb4 axb4 33.b3 Rdc8 followed by 34... Qb7 keeps exchange+P advantage. D.1) 32.Qxc6 Qxc6 33.Rxc6 Be7 followed by 34... Rac8 keeps the exchange and control of c-file. D.2) 33.Qxc6 Qxc6 34.Rxc6 Rxa4 black has R+N+P for 2Bs. E) 31.Qd1? Qxc7 32.hxg4 Bxa4! wins a whole rook.
F) 31.Qe3 Qxc7 32.axb4 axb4 33.b3 Qb7 and the pin is broken with a safe advantage. Not easy IMO. Time to check the game and kibitzing |
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| Sep-01-10 | | CHESSTTCAMPS: A Wednesday miss - I failed to consider 32...Qb8. |
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| Sep-01-10 | | zooter: Isn't this super simple?
30...Bc4 should win since the Be1+ discovered check idea doesn't seem to work TIme to check |
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| Sep-01-10 | | turbo231: I finally found the move but it took forever. I don't know why it was just right there looking me in the face. I must be half blind. I missed yesterday's puzzle, lately Tuesday's puzzles has been very hard. |
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| Sep-02-10 | | Formula7: I saw 30...Bc4 but thought I must have been missing something, because it seemed too simple. |
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| Sep-02-10 | | njchess: Interesting puzzle. Center and kingside are locked, so queenside is where all the action is. Lots of pieces, lots of possibilities. Besides Black's bishop being threatened, the one thing that stood out for is White's rook on the 7th rank. Given all the pieces on the board, it seems a bit overly aggressive, even premature. I think 30. ... Bc4 is the best move for Black. Since White's queen is threatened, it forces the rook exchange for the bishop giving Black a material advantage. Given the static nature of the position, material advantage at this point should be enough to win. 30. ... Bc4 31. Rc7xB PxR 32. RxP Ra7 seems the best for White as long as he is willing to play for a draw. 30. ... Bc4 31. Qe3 followed by a later f5 thrust is risky. I don't see White having enough material to get his queen into a mating position, nor do I see perpetual check. Time to check. |
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Sep-02-10
 | | LIFE Master AJ: (Late posting, I left for church last night and forgot to record my move.) For me, this was a fairly difficult tactic to spot. (I eventually got it, but I might have spent over 10 minutes on the critical position.) 30...Bc4! is a nice move and covers several different themes. (Unmasking, Pin, X-Ray, line-blocking, etc.) If White plays the seemingly OBVIOUS 31.RxB/c4?, he loses his Queen to the the not-so-obvious in-between move of 31...Be1+! So what does all this mean? Via a nice tactic, Black wins the exchange (31.Q-moves, QxR/c7; 32.axb3, etc.) ... and went on to win the game. |
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Sep-02-10
| | LIFE Master AJ: Sorry, should have been 32.axb4. |
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