< Earlier Kibitzing · PAGE 2 OF 3 ·
|Sep-01-10|| ||seagull1756: sorry, 26..Bc4 27.Rxc4, 28.Bxa8, 29.Qxc4 looks even better|
|Sep-01-10|| ||Artsemthon: <Robed.Bishop> After 37.f6 Nd3+ 38.Kg2 Qf8 Black defends against checkmate and wins.|
|Sep-01-10|| ||al wazir: <seagull1756, Scarecrow, once>: Thanks.|
|Sep-01-10|| ||nuwanda: |
he <Once>, too early in the morning?
as mentioned many times above 31.Rxc4 is not possible due to 31...Be1+ winning the queen.
26...Bc4 is a completely different thing than 30...Bc4
|Sep-01-10|| ||gofer: I would say its a queen trap, with a rook trap thrown in for good measure! If black can move Bb5 to a useful square that forces black to not move the queen then the queen trap can be sprung, Be1+ Kxe8 Qxb3! |
30 ... Bc4
31 R7xb4 Be1+ (R1xb4 is worse!)
32 Kxe1 Qxb3!
33 R1c3 Qb5 and black is winning
31 Qe3 Qxc7
32 axb4 axb4
32 Nb6 Ra6
This seems to sort out black's problems and he has ended an exchange and a pawn up! Time to check...
|Sep-01-10|| ||mrsaturdaypants: I immediately saw Be1+ and suspected that that move was important. Only black's LSB would then remain between the two queens, and white's queen would be unprotected. |
Bxa3 doesn't work as a preparatory move, as the white queen just takes on a3. Then I saw Bc3. Not only does this move put the question to white's queen in a fairly rude way, it seals off white's advanced rook from its fellow, leaving it vulnerable to capture. White could trade that rook for a bishop and pawn, except that the Be1+ maneuver is now ready. So, 30...Bc3 looks like a successful double attack.
As I look at it further, though, after 30...Bc3 31 Qe3, 31...Qxc7 32 axb4, and white doesn't seem so bad. That certainly doesn't look like a great position for black. But if instead 31...Bf8, then 32 Nb6 Nxb6 33 Bxb6 Ra6 34 Rc6, and I think the white rook escapes.
So, I can't find anything better than 30...Bc3 31 Qe3 Qxc7 32 axb4, perhaps followed by 32...Qc6 33 b3 axb4 34 bxc3 Qxa4 35 cxd4 Qa2+, where I would much rather be black, with that nice passed pawn on b4, though white has some counterplay.
This felt puzzle-y enough that I suspect that my first black move is right. After that, I'm not as confident that I found the best line, but I think that mine turns a seemingly difficult position into an advantageous one. If I could to that consistently in real games, I'd probably play more games and do fewer puzzles.
Time to check.
|Sep-01-10|| ||DarthStapler: Got it|
|Sep-01-10|| ||mrsaturdaypants: Well, I did not consider 30...Bc6, and at first I thought that it might avoid some of the complications of Bc4. But the line pursued by Phony Benoni and Obit looks to white's advantage to me. After 30...Bc6 31 axb4 Qxc7 32 b5 Rab8 33 Rxc6 Qxc6 34 bxc6 Rxb3 35 cxd7 Rb4, 36 Bb6 Rxd7 37 b3, and now 37...Rxb3 falls to a knight fork on c5, while after 37...Rb7 38 Bxa5, black still can't take on b3 for the same reason. Black ends up with two rooks and a passed pawn on d5, and white with both bishops, a knight and a passed pawn on c3. With the position apparently stabilized, I think the bishops will eventually dominate the rooks. Verdict: 30...Bc4 was better than 30...Bc6.|
But I can't pretend that I saw that when I did the puzzle. I totally missed the hint of the suggestion of this line. Kudos to those who found it.
|Sep-01-10|| ||JimmyRockHound: I got the first move, 30...Bc4 and that that would put the rook and queen in trouble. I didn't look much past that as: it's about as far ahead as I can see anyway.|
|Sep-01-10|| ||outplayer: why not 37.f6?|
|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:
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
(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!
|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.
|Sep-01-10|| ||Marmot PFL: Of course the move is 30...Bc4 with many threats - Bxb3, Qxc7, and if 31 Rxc4 Be1+|
|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.|
|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].
|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.
|Sep-01-10|| ||kevin86: Too tuff 4 me. I guess I'll stick to Othello and Checkers...|
|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.|
|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.|
|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.
|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.
|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.
|Sep-01-10|| ||mrsaturdaypants: Thanks, OBIT. Much richer than I appreciated at first.|
|Sep-01-10|| ||OhioChessFan: I really don't understand 32...Qb8 Why not the simple axb4?|
|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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