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|Feb-16-10|| ||agb2002: Black has a bishop and a pawn for a rook.
White threatens 44.Rb5+ Ka3 (44... Ka2 45.Kc2 with the double threat 46.Ra5# and 46.Rxb2+) 45.Kc3 Ka4 (45... Be1+ 46.Kc2 Bxg3 47.Rb3+ Ka2 48.Rxb2+ Ka1 49.Ra3 Ka2 50.Rxg3) 46.Rxb2 Bxg3 47.Kc4 Ka5 (47... Ka3 48.Rb3+) 48.f5.
The immediate 43... b1=Q just draws after 44.Rb5+ Ka2 45.Ra5+ Kb2(3) 46.Rb5+, etc.
The underpromotion 43... b1=N+ 44.Ke2 Bd4 is not convincing.
A better option is to cover the black king with 43... Be1+:
A) 44.Kxe1 (Kd1, Kd3) b1=Q+ - + [Q vs R].
B) 44.Ke2(3) b1=Q 45.Rb5+ Bb4 - + [Q+B vs R].
|Feb-16-10|| ||Caissas Clown: Had a look at underpromotion to N , but saw the R was too far away to catch in a forking check.
Then BE1+ leapt out-goodnight White.
I feel sorry for the loser-his name is an anagram of "A mate,moron !"
|Feb-16-10|| ||agb2002: I think I need a cup of coffee: I didn't see the maneuver given by <dzechiel> 43...b1=Q 44 Rb5+ Ka2 45 Ra5+ Kb2 46 Rb5+ Ka1 47 Ra5+ Qa2+ etc.|
|Feb-16-10|| ||A Karpov Fan: got it|
|Feb-16-10|| ||TheLightSquares: Time to "Check"|
|Feb-16-10|| ||felixd: I got it... It's a very common tactic in the endgames...|
|Feb-16-10|| ||TheaN: Tuesday 16 February 2010
Material: White up, +2 / +3
Candidates: b1=N†... b1=Q...?... oh, that... <[Be1†]>
A very weird promotion problem. Black is down an exchange but has the typical 2nd rank pawn as compensation. Initially I thought Black shouldn't allow the skewer by playing b1=N†. Although this keeps the promoted piece it allows at most a draw with the f-pawns as weak as they are. So, I checked why b1=Q actually failed, and I thought I saw 43....b1=Q 44.Rb5† Ka2, and now 45.Rxb1 Kxb1 loses, so 45.Ra5† with perpetual. However, at first sight I thought Black could play 45....Bxa5 winning... well if I can make a bishop from f2 go to a5 I'll win more games in the near future by making illegal moves :). So, 45.Ra5† Kb3 46.Rb5†= DOES lead to perpetual.
Then the idea becomes obvious, no immediate promotion, and we have to utilize the piece to get the pawn on the final rank. In fact, it's then when it's clear this is an easy puzzle:
<44.Kxe1 b1=Q† > is in fact White's best try but toothless.
<44.Ke2 b1=Q 45.Rb5† Bb4 > and Black wins. NOT Ka2 now, as 45....Ka2 46.Rxb1 Kxb1 47.Kxe1 wins. If White opts for the first variation Black has some easy ideas as an immediate dual threat on the g3-pawn and h5-Rook, unpleasant. Time to check.
|Feb-16-10|| ||randomsac: NIce tactic. The best part is that if the king flees to a square where queening won't produce check, f5 seals the rook off from any heroics.|
|Feb-16-10|| ||patzer2: I went through some of the same ideas as <dzechiel> in trying to solve today's Tuesday (43...?) puzzle.|
My first thought was Black promotes, exchanges Queen for Rook and a Bishop and two pawns should win against two lone pawns. However, I didn't work it out nearly as well as <dzechiel>.
Yet after reassessing the position I did come up with the winning deflection sacrfice 43...Be1+!, which wins one of two ways. If 44. Kxe1, then simply 44...b1(Q)+ (promoting with check) saves the new Queen from White's threatened skewer. If 44. Ke2, then 44...b1(Q) 45. Rb5+ Bb4 (with a key defensive interposition) does the trick.
After 44. Kxe1 b1(Q)+ the Queen versus Rook ending wins easy enough, because Black will be able to mop up the remaining White pawns due to the skewer and double attack threats against the unprotected Rook.
For example, after 43...Be1+! 44. Kxe1 b1=Q+, one possibility is 45. Kf2 Qc2+ 46. Ke3 Qc3+ 47. Ke2
[47. Kf2 Qd2+ 48. Kf3 (48. Kg1
Qd1+ ) 48... Qd1+ ;
47. Ke4 Qe1+ 48. Kd5 (48. Kf5 Qe6#) Qa5+ ]
47... Qxg3 48. Rb5+ Kc4 49. Rb8 Qxf4 with an easy win.
|Feb-16-10|| ||johnlspouge: < <iamsheaf> wrote: <johnispouge> <44..b1=Q+> is a blunder white has the *obvious* Rb5+, exchanging queen for the rook. >|
*Obviously*, you play chess under a different set of rules than the rest of us. When your K is in check, you must rescue him from check before anything else, i.e., Rb5+ is illegal.
Some thought before posting can save a lot of grief.
|Feb-16-10|| ||johnlspouge: < <dumbgai> wrote: <iamsheaf> Except, 44...b1=Q+ is check... >|
|Feb-16-10|| ||Marmot PFL: 43...Be1+ was a quick find, 44 Kxe1 b1(Q)+, otherwise queen anyway and interpose the bishop on b4.|
|Feb-16-10|| ||SetNoEscapeOn: <Skylark>
Very good point.
|Feb-16-10|| ||Patriot: 43...b1/Q would be nice, but 44.Rb5+ is a problem.
43...b1/N+ is an option but doesn't look all that decisive.
43...Be1+! looks very good. It attempts to draw the king to e1 where the pawn promotion is accomplished with check. If white avoids the bishop, then after 44...b1/Q 45.Rb5+ Bb4.
|Feb-16-10|| ||lost in space: 43...Be1+! 44. Kxe1
(44. Ke2? b1Q 45. Rb5+ Bb4 0:1; 44. Kd3?? b1Q+ 0:1;)
44...b1Q+ and White is lost.
|Feb-16-10|| ||Nullifidian: Saw this one in seconds.
43... e1+ forces White to either capture the bishop, whereupon Black will queen with a gain of tempo, or allows Black to block b5+ with b4, if White doesn't go for the bishop.
|Feb-16-10|| ||chrisowen: The cleric's king.. Fe1! how nice. First energy is required, the cleric does arrange alloying with the pawn whilst the good king remains late in. Ram on the offering alters white's hopes thus I saac willingly. The Rook cant find fortune fuming away on h5, it was then I smell the check edifying the pawn's advance.|
|Feb-16-10|| ||cyclon: 43. -Be1+ wins. 44.Ke2 b1Q 45.Rb5+ Bb4, or 44.Kxe1 b1Q+.|
|Feb-16-10|| ||pferd: <nuwanda:
i saw 43...Be1+ when black is able to queen with check or protected (Bb4), but i'm somewhat paranoid about queen against rook without the possibility of building a passer, fortress, etc. this is probably not the case here, but...>
I think after 43...Be1+ 44.Kxe1 b1=Q+ Black quickly skewers either the g pawn or the Rook. So that should be an easy win. However your analysis of 43...b1=Q winning also seems correct.
|Feb-16-10|| ||scormus: I really must find a time of day to do these when my brain is not dead. I thought I needed to manoever the B to b4 so it would shield the K from the R+. I guess I forgot today was Tuesday. Fancy not realising the b1=Q is #. So embarrassing :-(|
|Feb-16-10|| ||YouRang: Easy, but pretty. It's spoiled a little because black could win with the straight-forward 43...b1=Q (where we end up trading our new queen for white's rook), but somehow it's more pleasing to sac the bishop so we can hang on the the queen.|
That's done with 43...Qe1+!, which gives black a choice: take the bishop which allows us to promote with check, or decline the bishop (e.g. 44.Ke2 b1=Q) and let us defend against the rook skewer 45.Rb5+ with 45...Bb4.
|Feb-16-10|| ||David2009: Tuesday's puzzle R Mateo vs C Cuartas, 1984 Black 43...?|
We have an interesting choice between 43 Bxg3 which may or may not win and 43 Be1+ which wins Q for R. If 44 Ke2? g1=Q 45 Rb5+ Bb4.
Crafty will no doubt put up a tough fight, but I don't think White can construct a safe fortress, so
the ending should be won (remove the Black Pawns and it is a fortress draw). Main variation Q v R ending
43...Be1+ Kxe1 44 b1=Q+ Kf2 45 Kf2 Kc4! 46 Rh8 (threatening Re8 barring the WK) Qb6+! 47 Kg2 Qc6+! 48 Kf2 Kd5
and Black has successfully approached the Pawns. Time to
White resigns - very unimaginative. Crafty of course plays on:
click for larger view
Mateo vs Cuartas 1984 43...? colours reversed
White to play and win- take care now! (The start is given above, colours as in the game).
|Feb-16-10|| ||kevin86: The key move really gums up the works.
44 e2 b1= 45 b5+ b4 and the queen is safe O 44 xe1 b1=+ promotes with check.
|Feb-16-10|| ||mrsaturdaypants: Let's see. A pawn to queen. But white's rook threatens to move to the b file to prevent this. Black's king could move to the 4th rank to keep the rook at bay, but then white's king could move to c2, preventing promotion. So, how to get the white king away from c2, so that the black king can guard the b5 square? Oh, and the white rook can also protect b1 by moving to h1, so that needs to be addressed as well. So:|
If 44 Kxe1, then b1=Q+ wins.
If 44 Kd3 b1=Q+ 45 Rb5 Bb4 wins
And on other king moves, 44...Kb4 wins.
Time to check.
And on any other king move, 44...Kb4 wins.
|Feb-16-10|| ||YouRang: The more I look at this, the more I think that it would actually be an easier game to win with 43...b1=Q. But 43...Be1+ is still spiffier-looking.|
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