|
< Earlier Kibitzing · PAGE 4 OF 4 ·
Later Kibitzing> |
| Jan-11-10 | | turbo231: <Patriot> Can you please tell me the best place to buy John Bain's chess tactics book? Or is it on line for free? Thank you. |
|
| Jan-11-10 | | VincentL: The Monday puzzle often sets the theme for the week. Are we looking for a mate, or a
combination to win material, a stalemate, etc.
Today the solution is 37.....Rxe4. Now if 38. Rxe4 Bd5 pinning and winning the white rook. White has no reasonable alternative on move 38. |
|
| Jan-11-10 | | Patriot: <<turbo231>: <Patriot> Can you please tell me the best place to buy John Bain's chess tactics book? Or is it on line for free? Thank you.> I ordered mine "used" through Barnes and Noble. I'm not sure if it is available new anymore. |
|
Jan-11-10
 | | fm avari viraf: As this game was played, I was just sucking my thumb pershaps in the cradle since I was born in 1946 & never thought I had to pin so many pieces on & off the board in life. |
|
| Jan-11-10 | | Patriot: <<sileps>: On a side note, 35..Bd5 is a much stronger move than the text move unless I'm missing something.> 35...Bd5 is not safe. 36.Rxd5 or 36.Bxd5 wins a piece for white. My coach refers to this as a "counting" error. |
|
| Jan-11-10 | | Patriot: <sileps> Nevermind, it is definitely a Monday. I was looking at the wrong position. 35...Bd5 is an interesting move. It seems white must lose the exchange with 36.Rc4. Either that or drop a piece from what I can tell. Your move is probably best. |
|
| Jan-11-10 | | StevieB: Took a couple of minutes but suddenly it jumped out and grabbed me around the throat. Ouch! |
|
Jan-11-10
 | | eternaloptimist: This is indeed a very easy puzzle. If 1 follows the general rule of thumb to examine all captures & checks b4 moving, he/she can solve this puzzle very quickly. I'm surprised that someone of eliskases' caliber didn't c this tactical trick. Apparently he forgot to try to predict borges' moves. This was the reason he didn't c it. |
|
| Jan-11-10 | | David2009: Amazingly, White had drawing chances at move 28:
click for larger view
Instead of 28.Rf1, White can try 28.Bd5! exchanging his weak Bishop. Crafty then gives as best for both sides
28...Bc5+ 29.Kg2 Bxd5+ 30.Rxd5 Rxf4 31.Kg3 Ra4 32.Rd2 Rda8 33.Kf3 Ra3+ 34.Ke4 and Crafty can now only find R3a4+ 35.Kf3 Ra3+
36.Ke4 R3a4+ with perpetual check. If Black plays too aggressively he can actually lose: e.g. 33...Rxa2?? 34.Rxa2 Rxa2
35.Rc8+ Kg7 36.Ne8+ and mates in three.
Appearances can be very deceptive. Playing through this game I thought that White was losing at move 17. 
click for larger view (Eliskases v Borges 1946 17?) Eliskases finds the
fine resource 17 Qa3! avoiding the positional blunder 17 Nd6 Rd8 18 Nxc8? giving an inferior ending without compensation (Black controls both the d4 and d5 squares).
So ...Rd4 is a powerful positional Black threat. If White plays Rxd4 Black has a powerfl passed Pawn and,
With major pieces still on the board, the B of opposite colours favour the attacking side - namely Black. Playing through the game I was expecting White to double Rooks, which he could have done safely at move 20 with Rd3. Now 20...b6 does not work for Black: 21.Rad1 f5 22.cxb6! axb6 23.Nb5! winning the exchange e.g. cxb5 24.Bxa8 Rd4 25.Rxd4 exd4 26.Bf3 and White is a comfortable exchange ahead. White could still start to double Rooks a move later, but this time at the price of a Pawn. Then out of the blue Crafty finds the resource of the first diagram (I was playing througjh the last part of the game with colours reversed). Does this really draw? - only Fritz or Rybka-3 (which I do not possess, computer memory limitations) can tell. |
|
| Jan-11-10 | | beenthere240: <eternaloptimist> I'm sure white saw what was going to happen. His problem is that after 36...Rd4, the only way to save his bishop (other than the losing rook move) is by moving it, after which he loses his f-pawn and then he might as well quit anyway.
An alternative explantation is time pressure with white trying to make the 40 move control. If he had had more time, he could have resigned. |
|
| Jan-11-10 | | RandomVisitor: <David2009>In your analysis of the 28.Bd5 line above, Rybka identifies the moves 34...Rxh3 and 34...Rd8 and says that Black is winning. What does crafty say? |
|
| Jan-11-10 | | RandomVisitor: 20.e4 is probably not best, and the beginning point of black's advantage. Maybe 20.Rd2 or 20.Rd3. |
|
| Jan-11-10 | | TheBish: Eliskases vs T Borges, 1946 Black to play (37...?) "Very Easy"
Black wins a piece with 37...Rxe4 38. Rxe4 Bd5.
Mondays are nice after a busy weekend! |
|
| Jan-11-10 | | muralman: Why did white bother taking the rook? |
|
| Jan-11-10 | | Once: <muralman: Why did white bother taking the rook?> The move number might help to explain it. If the time control was at move 40, one or both players could be playing quite quickly. It can sometimes take some time to realise that you have a lost position. <beenthere240> explains this well in his post. Or ... white could be hoping that black might not see the Bd5 pin. He might as well play 38. Rxe4 since no-one ever won a game by resigning. I read somewhere that you should never resign until you reach a position where your gran would understand why you didn't play on. Or something like that. |
|
| Jan-11-10 | | YoungEd: I guess solving a Monday puzzle doesn't call for too much chest-thumping, but I'll take what I can get! |
|
| Jan-11-10 | | TheFocus: <turbo231>< It took me about 2 minutes to see the move. Is that too long? RxB,RxR, then pin the rook using Bishop.> Well, I saw it in five seconds. So, yeah, I think that two minutes was slow for a Monday puzzle. First time I tried to solve one of these. |
|
| Jan-11-10 | | gropek: Hi, why 20 e4 is a bad move?
I thought that the weak move was 21 f4, because when black did gxf4, he transforms his bad bishop into a good bishop, because the 'g' pawn was blocking it. Can anyone one give ur opinion about my analysis and about 20 e4 being bad? thank you.
PS: About solving puzzles, i think the best is to seek the enemy weakness, and then try to see moves that changes the enemy weakness into ur own advantages. |
|
| Jan-11-10 | | WhiteRook48: 37...Rxe4 way too obvious |
|
| Jan-11-10 | | RandomVisitor: After 13...Nc5 white might be able to keep a small advantage:
click for larger view Rybka 3:
<[+0.27] d=24 14.Qa3> Ne6 15.Qxe7 Rxe7 16.Rac1 Nh5 17.Nde4 f5 18.Nd6 f4 19.gxf4 Nhxf4 20.Bxa7 Bd7 21.Be3 Nd4 22.Bxf4 exf4 23.Nxb7 Bxh3 24.Bxh3 Rxb7 25.b3 Re7 26.Bg2 Kf7 27.Rd2 h5 28.Bh1 g5 29.Rcd1 |
|
| Jan-11-10 | | RandomVisitor: After 20.e4 <b6!> black appears to be able to exchange off the well-placed white knight and achieve some counter-play:
click for larger view Rybka 3:
<[-0.57] d=19 21.Rd3> bxc5 22.Qxc5 Rd7 23.Rad1 Rb8 24.b3 Rbd8 25.f4 h5 26.Kh2 h4 27.fxe5 hxg3+ 28.Kxg3 Bd5 29.Nc4 Bxc4 30.Rxd7 Rxd7 31.Rxd7 Qxd7 32.bxc4 Qd2 [-0.83] d=19 21.Rd2 bxc5 22.Qxc5 Rd7 23.Rad1 Bf8 24.f4 Qb6 25.b4 Rb8 26.Qxb6 axb6 27.f5 Bxa2 28.fxg6 fxg6 29.Rxa2 Rxd6 30.Rf1 Rbd8 31.Rc2 Kg7 32.h4 c5 33.bxc5 Rc6 |
|
Jan-11-10
 | | LIFE Master AJ: Yawn. 37...RxB/e4 and 38...Bd5. (I routinely do this kind of stuff in blitz.) |
|
| Jan-11-10 | | RandomVisitor: After 20.Rd2 white <might> have better chances:
click for larger view Rybka 3:
<[+0.22] d=21 20...f5> 21.Rad1 e4 22.Qe3 Qa5 23.f3 b6 24.fxe4 Qxc5 25.Qxc5 bxc5 26.exf5 Bxa2 27.Bxc6 Rab8 28.Kg2 Rxb2 29.fxg6 Rxd2 30.Rxd2 Be6 31.Rd3 Be5 32.Nb7 Rxd3 33.exd3 c4 34.dxc4 Bxc4 35.Na5 Be6 [+0.37] d=21 20...b6 21.b4 bxc5 22.bxc5 e4 23.Rf1 f5 24.f3 exf3 25.Qxf3 Rab8 26.Rfd1 |
|
| Jan-13-10 | | David2009: <RandomVisitor>: thanks for this response to Eliskases vs T Borges, 1946
You are right, 28 Bd5 fails to draw. In the 28.Bd5 line, Crafty gives as best for both sides ...Bc5+ 29.Kg2 Bxd5+
30.Rxd5 Rxf4 31.Kg3 Ra4 32.Rd2 Rda8 33.Kf3 Ra3+ 34.Ke4 to reach 
click for larger view (Black to play).
Crafty now repeats moves with Ra4+ Kf3 Ra3+ draw. But your suggestion of 34...Rxh3 wins comfortably after
35.Kd5 g5 36.Nb7 Be3 37.Rd3 g4 38.Rcc3 Bf4 39.Rxh3 gxh3 40.Rxh3 Rxa2. The dust has cleared and Black
is two Pawns up. My source for these moves are the Crafty links given below. After 35 Kd5 White has tactical chances, but these only come alive if Black makes the mistake of exchanging
on d6 prematurely creating a passed Pawn, and/or allowing the white K to penetrate. If White attacks f7 with Rc7, ...Rd8! is a formidable defensive/attacking move,
and ...Re2 attacking the e5 Pawn is also dangerous (there are tactics involving a Rook pseudo-
sacrifice on e5 followed by Bxd6+ winning the R back with the N as interest). Meanwhile the B guards f2, so f7 is never under serious attack. So the White "attack" never gets going. So how come Crafty missed this unless forced to find it (by starting from the above position)? Here
are my views/guesses. First,
this online implemenation of Crafty is primarily designed as an ENDGAME TRAINING tool. It expects to be
defending positions as Black, so it is not averse to drawing (unless it can see a clear plus). It happens to
play middle games very well and with a sharp eye for tactics, but this is a bonus. Secondly, it seems to
evaluates positions only either 11 ply or 13 ply ahead (I am not sure which). It also has a restricted link
to a Nalimov table base (looking ahead about 35 moves).
Thus it plays KQ vs KR perfectly, it plays most tablebase RPP v R perfectly etc., but it plays
complex KNN versus KP endings weakly both in attack and defence. Crafty links:
Eliskases v Borg 28 Bd5 34..Rxh3
http://www.chessvideos.tv/endgame-t...
Eliskases v Borg 28 Bd5 34..Rxh3 colours reversed
http://www.chessvideos.tv/endgame-t...
Eliskases v Borges 1946 27?
http://www.chessvideos.tv/endgame-t...
You are white, drag and drop the move you want to make. |
|
| Jan-17-10 | | VargPOD: Ah, Monday.
37...Rxe4 nets the bishop, because 38.Rxe4 Bd5 is a deadly pin. Total 1/1 this week, 4,5/8 this year. |
|
 |
|
|
< Earlier Kibitzing · PAGE 4 OF 4 ·
Later Kibitzing> |
Kibitzing
sac: 37...Rxe4