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Jun-19-10
 | | Jimfromprovidence: After 63...f3, white might try to make a run for it with with 64
b5?!, hoping to promote with check.
click for larger viewThis attempt loses after 64...Bxb2+, because now white can only stop one pawn from promoting. 
click for larger viewIn one variation, if white tries to defend with 65 Kb1, then it's 65... f2 66 Nxf2 a3, with mate next move.
click for larger view |
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Jun-19-10
 | | tarek1: I forgot to consider <63.Kd2> as a possible defense. In which case <63...b4> wins for Black. |
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Jun-19-10
| | tarek1: <Eduardo Leon> thanks for pointing that out, in that case you're right Bxb2 doesn't work. |
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| Jun-19-10 | | tacticalmonster: 1) Black has the superior minor piece. The bishop completely dominated the knight. 2) Black king is much more active than its' counterpart. 3) Black has a queenside space advantage
4) White has a passed e4 pawn blockaded by the bishop 5) Black can use kingside pawns breakthrought starting with g4 candidate: 60 b4,g4
a) 61 hxg4 hxg4 62 b4 Kd2! 63 bxa3 (63 Bxb2 Nxb2 64 bxa3 Nd3! 65 a2 Nc1+ 66 Kb2 Nxa2 67 Kxa2 e5=) bxa3 64 Kxa3 Nf2! 65 Kb3 Nd3 66 Bc3+ Kd1 67 a3 g5 68 f3 g6 69 f2 Ke2 70 Kc2 e5 71 Bxe5 Nxe5 72 a2 g7 73 a1=Q g8=Q 74 Qf1+  b) 61 axb4 g4! (White cannot allow g3 because the knight is poorly placed to stop the g-passer)62 hxg4 hxg4 63 fxg4 Bxb2+! 64 Nxb2 (64 Kb1 a3 tranpose) a3! (Knight cannot move because of a2) 65 Kb1 axb2 66 b5 f3 67 b6 f2 68 b7 f1=Q mate |
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| Jun-19-10 | | gofer: I tried 60 ... g4 which seems okay, but sometimes the knight can be a very clunky piece, so what about making its life difficult!? 60 ... b4
61 axb4 ...
Now if Pb2 gets taken black is going to promote Pa3! So lets give the knight even more work to do! 61 ... g4 62 fxg4 f3 63 ... Bxb2+ will follow game over... 61 ... g4 62 hxg4 h4 63 g5 h3 64 g6 h7 65 Nf2 Bxb2+ game over... Time to check! |
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| Jun-19-10 | | David2009: O Renet vs G Miralles, 1986 Black 60...? First consider 60...g4 61 hxg4 hxg4 62 fxg4 f3 63 g5!? Bxb2+ 64 Kd2! (if 64 Nxb2? f2 and promotes; or 64 Kb1? Bxa3 65 g6 Bb2 66 Nxb2 f2 0-1)
Now (A) 64...Bxa3 65 g6 Bf8 66 e5 a3 67 e6 a2 68 e7 Bxe7 69 g7 a1=Q 70 g8=Q CHECK is messy for Black, can we improve?
We don't have to find everything from the puzzle position, but improvements are difficult to see. There is an important first move alternative: 60...Bxb2+!. Now 61 Kd2 loses prosaically, so 61 Nxb2! hoping for 61...g4? 62 hxg4 hxg4 63 fxg4 f3 64 Kd2 and White has counter-chances. But 61...b4! 62 axb4 a3 63 Kb1 (to stop a2: if 63 Nd3 a2 64 Nc5+ Ka3! and the a Pawn promotes) axb2 65 d5 g4 66 hxg4 hxg4 67 d6 g3 68 d7 g2 69 d8=Q g1=Q#.
<Once> many posts ago: a N two squares diagonal from the opposite K takes 3 moves to check it. This is useful to remember when defending against/ attacking with a N.
Time to check:
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Black plays 60...b4 first. Time to check over the board whether this is just a transposition, or if there is a hole in my analysis.
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On moving the pieces, I see that there are TWO massive holes in my analysis. First 60...Bxb2+?? 61 Nxb2 b4 62 Nd3 instead of axb4. Even after 62. axb4 a3, 63 Kb1 wins for White: 64...axb2 65 b5! not 65 d5?? and it is WHITE not Black who promotes with check. As played, 60...b4 61 axb4 Bxb2+?? transposes into the above losing variation. |
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| Jun-19-10 | | Skylark: My answer was <60. .. g4> continuing with <61. hxg4 h4> leading to a win and <61. fxg4 hxg4 62. hxg4 f3>. Now I had <63. g5 Bxb2+ 64. Nxb2 f2> or <63. Kd2 b4> transposing (I hope?) into the game line. Does a computer back up my transposition? Anyways I think I got the main idea so I'll pat myself on the back anyways. |
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| Jun-19-10 | | agb2002: Black has a bishop for a knight.
The first idea that comes to mind is to take advantage of the king side pawn majority with 60... g4, but after 61.fxg4 hxg4 62.hxg4 f3 63.g5 Bxb2+ (63... Bf4+ 64.Kb1 Bxg5 65.e5 Bh4 66.e6 and Black can't play 66... f2) 64.Kd2 (64.Nxb2 f2 - +; 64.Kb1 Bxa3 65.g6 Bf8 66.e5 a3 67.e6 a2+ 68.Ka1 Bg7+ 69.Nb2 Bxb2#) Kxa3 (64... Bxa3 65.g6 Bf8 66.e5 a3 67.e6 a2 68.e7 Bxe7 69.g7 a1=Q 70.g8=Q+) 65.Nxb2 Kxb2 66.g6 f2 67.Ke2 f1=Q+ 68.Kxf1 a3 69.g7 a2 70.g8=Q a1=Q+ draw. Another option is 60... b4 61.axb4 (otherwise 61... bxa3) g4 (61... Bxb2+ 62.Nxb2 a3 63.Kb1 g4 (63... axb2 64.b5) 64.Nd3 Kc3 looks more complicated) A) 62.fxg4 hxg4 63.hxg4 f3 64.b5 (or 64.g5) Bxb2+ 65.Kd2 (65.Kb1 a3 66.Nxb2 axb2 and mate in two) a3 - +. B) 62.hxg4 h4 63.b5 h3 64.b6 h2 65.Nf2 Bxb2+ 66.Kd2 a3 67.b7 Be5 - +. |
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| Jun-19-10 | | johnlspouge: Saturday (Very Difficult)
O Renet vs G Miralles, 1986 (60…?) Black to play and win.
Material: B for N. Black has a spatial advantage in a B vs. N endgame. To exploit restricted influence of the White K and N further, Black can sacrifice to create a K-side passed P with pg5-g4, because his B on the a1-h8 stops both Pe4 and Pg4. He also might sacrifice B for P on the Q-side. Candidates (60...): g4
60…g4 (threatening 61…gxh4 or 61…g3, both winning easily) 61.fxg4 [hxg4 h4, then after Nd1-f2 to stop Ph4, Black plays Be5xb2+ Kxa3] 61...hxg4 [h4 g3, and then Pg3-g2-g1=Q]
62.hxg4 f3
(1) 63.g5 Bxb2+ 64.Kb1 [Nxb2 f2, then 65…f1=Q]
64…Be5
Black maintains his B at e5 to stop the Black Ps. He plays Kb3xa3-b3 and then advances Pa4 to win. White cannot even threaten Be5 with Ne3, because Black answers Nxe5 with Pf2-f1=Q. (2) 63.Nf2 Bxb2+
As above, Black withdraws his B to e5, plays Kb3xa3, and advances his Q-side Ps to win. (3) 63.Kd2 b4 (threatening 64…bxa3 65.bxa3 Kxa3, then Pa3-a2-a1=Q) 64.axb4 Bxb2+ (threatening 65…a3 66…a2 67…a1=Q)
65.Nxb2 [else, White has no counter-play, because the Black B slows the White Ps] 65…f2 66.Ke2 f1=Q+ 67.Kxf1 Kxb2
Black queens first Pa4-a3-a2-a1+ with check and wins. Toga supports the transposition, although it prefers the game variation (probably because it permits fewer defensive options). |
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| Jun-19-10 | | kevin86: I missed this one-I was looking for a quick answer and couldn't find it. Black needed to establish a second pass pawn to divert the king away. The end can be a bit tricky-black forces the king to the first row-then queens a step ahead WITH check-a similar theme earlier in the week. |
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| Jun-19-10 | | gropek: I have found a different way than in the game, but that works too!(tested on little chesspartner xD)
That would be ...
60 ... Bd4
Cramping the pieces, the only move that wouldnt blow the game is 61 Kb1 , because, for example, 61 Nc3 b4 62 axb4 a3, and white is ruined. 61 Kb1 g4 (now it gets to the same idea withing the game) now either pawn takes, i'll get a passed pawn on the king side, and, the threat of b4 and making a passed pawn on the quee side is still available, and with the bishop blocking any counter-chances, the game is won. (Feel free to find any mistake in the way I found, i would be happy to see if im wrong) Thanks |
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| Jun-19-10 | | patzer2: My solution to Today's Saturday end game puzzle was 60...Bd4 which wins easily after the 61. Kb1 g4!  continuation I had planned.However, I didn't expect the Fritz 10 reply 60...Bd4 61. Kd2! Here after 61...Bg7 62. Ke2 b4 Black is still winning, but its more complicated than the game continuation. Also, 60...Bd4 61. Kd2! Bxb2?? = is a blunder leading to a level Queen versus Queen ending as both sides promote. According to Fritz just about every plausible move wins for Black, but the game continuation 60...b4! 51. axb4 g4 is apparently the strongest winning line. |
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| Jun-19-10 | | Julian713: <<Once>:You cannot imagine how many years of study and research have gone into this little theory of mine. Selfless, scientific, dedicated research, of course.> :D Well said! |
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| Jun-19-10 | | Marmot PFL: Black has the far more active king and minor piece, as well as the more advanced pawns, so he should be winning by creating passed pawns on both sides. White will also get passed pawns so black needs to be accurate. Maybe there are several plans but he can start with the king side - 60...g4 61 fg hg 62 hg f3 which ties up the knight and threatens Bxb2+. If 63 Kd2 now black switches to the q side 63...b4 64 ab (g5 Bf4+) Bxb2. Now white has 3 passed pawns to black's 2, but the bishop can hold them up long enough for black to queen first. |
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| Jun-19-10 | | Ferro: densidad de Poblacion (AL PRINCIPIO): 32Hab./64 escacs= 0'5 Habitants por m2. En esta SITUATION, el Horse esta como pez en el agua... FINALLY, quedan 8-10 Hab. por 64 casillas (10/64 = 0'1 Hab.por m2). EN ESTA SITUACION, el Alfil queda en ventaja clara con respecto al Caballo (Knight), dado que los pawns se mueven... uno a uno, y el HORSE no puede detenerlos... HAY QUE DESCIFRAR |
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| Jun-19-10 | | Ferro: En Finales de partida, el Horse es como un PERRO que muerde! |
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| Jun-19-10 | | Ferro: O NO? |
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Jun-19-10
| | NM JRousselle: 60... Bd4 works just fine
61 Kd2 b4
62 ab Kb4
and White will soon find himself in Zugzwang. Plus, the Black king is now in the square of White's e pawn.Winning this game is not difficult. Black has far too many advantages. |
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| Jun-19-10 | | butilikefur: <60...b4 61. axb4 Bxb2+ 62. Kb1> 62. Nxb2 a3 63. Nc4 a2 (63...Kxc4 should also work because after 64. e5 Kd5 65. b5 Black is just in time) 64. Nd2+ Kc3 65. Nb1+ axb1=Q+ 66. Kxb1 g4 <62...a2+> 62...g4 63. Nd3 g3 64. Ne1 or 63. gxf3/gxh3 Nf2 wins for White <63. Ka1 Kxb4 64. Nd1> wins for White.. |
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| Jun-19-10 | | DeepThought: There is absolutely no need to play b4 in the whole endgame, and there is no gain in playing it this early, if at all. This puzzle is not solved by playing b4, the game can be won without it. E.g., just push the king side pawns and keep the bishop on the a1-h8 diagonal (including Bxb2). Eventually, either the a-pawn or f-pawn will promote on the first rank. |
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| Jun-19-10 | | whiteshark: <60...b4!!> is really a great move showing deep understanding of the needs of the position. |
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| Jun-19-10 | | mworld: bd4 is the move I wouldn't hesitate to make...although i don't hesitate to lose/draw at times :) --- i don't think that's the case here though. |
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| Jun-19-10 | | TheBish: O Renet vs G Miralles, 1986 Black to play (60...?) "Very Difficult"
This is obviously a breakthrough problem; Black must break through with a passed pawn on one side or the other, or (as it turns out) both. I was looking at 60...b4 61. axb4 Bxb2+ 62. Nxb2 a3, but White wins with 63. Kb1! followed by queening either the e-pawn or b-pawn. However, I was on the right track... 60...b4! 61. axb4 g4!
This creates a passed pawn on the other wing, which is too much for White to deal with. 62. fxg4
No better is 62. hxg4 hxg4 (or 62...h4), with the same situation. 63...Bxb2+! 64. Nxb2 a3
Now there are two passed pawns, so that if 65. Kb1 (as in the earlier note) axb2 66. b4 f3 67. b5 f2 68. b6 f1=Q#. 65. Nd3 a2 66. Nc5+ Kxb4
Also winning is 66...Ka3 and queens next, but this leads to a cute finish. 67. Kb2 Kxc5 68. gxh5 f3 69. h6 f2 70. h7 f1=Q 71. h8=Q a1=Q+ 72. Kc2 Qxh8 and wins. |
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| Jun-19-10 | | mastyin: 1.. g5 2. hxg4 hxg4 3. fxg4 f3 4. g5 Bxb2+ |
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| Jun-20-10 | | butilikefur: <DeepThought> and <whiteshark>.. lol |
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