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Boris Alterman vs Ronen Lev
ISR-ch (1994), Ramat Gan ISR, rd 5, Oct-07
English Opening: Symmetrical Variation. General (A30)  ·  1-0
ANALYSIS [x]

FEN COPIED

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sac: 26.Rf7 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 3 OF 3 ·  Later Kibitzing>
May-24-07  Ashram64: saw it..Rf7.. then has to kick out the queen to prevent the trade Q for 2 rooks
May-24-07  LivBlockade: <eblunt> Thanks - that's a clean mate against 27...Ke8 - White doesn't even need b3 (or Rf1+) in that line! It's amazing how strong a coordinated Queen and Pawn can attack a King stumbling over it's own pieces. Still, I think 27...Ke8 is a little trickier defense than 27...Kf8 - it lures the White Queen from h7 creating a potential flight square for the Black King on e7 (after ...Bf6) and forces White to find a non-checking move like g6 (or gxf6) which, at least for me, is more difficult to find than 28. b3 in the game.
May-24-07
Premium Chessgames Member
  YouRang: Outstanding coordination of pieces here! A pawn on b2 is quietly doing it's part to contribute to an assault on black's kingside.

I would feel pretty good about myself if I had seen it too. :-|

I did see 26. Rf7 Kxf7 27. Qxh6+ Kf8, but I went with the way-too-tame 28. Rf1+ Qxf1 29. Bxf1 with slight advantage. I didn't notice how easily the black queen could be forced off the critical a6-f1 diagonal. Interesting puzzle!

May-24-07  newton296: Looked at it but Rf7 just didn't hit me ! I guess If it doesnt hit me asap it usually never does! I looked at Qh5, Qf2 even rf6 . Nothing here so I gave up and looked at the game and was disappointed to see how easy it was. fiddle!!
May-24-07  doremi: Yeah, it is the later b3 makes the earlier Rf7 a really strong move!
May-24-07  MostlyAverageJoe: <TrueBlue: Mostly Average Joe, 32 .. Bg2+ 33. Kxg2. Doesn't that work?> Illegal move. After 32 .. Bg2+, the board is:


click for larger view

<TrueBlue: Now I remember, I had 27. Ke8 in my calculations, that's why I thought Qg6+ works> Indeed, with black's 27 ... Ke8, there is a forced mate by just the queen and the pawn (can be delayed by black's sacrificing the queen on f1). Either your 28.Qxg6 or (Hiarcs') 28.Qg8+ works here, mating in 9 and 6 moves.

<goodevans: _MY_ ongoing experiment has it as a bit of a toughie.> Your opinion has been noted, thanks. I am keeping a big spreadsheet offline, trying to correlate the difficulty evaluations posted on my forum with the opinions expressed by kibitzers.

While an individual person may disagree with my ratings of individual puzzles and consider them more or less difficult than my calculations would indicate, I am hoping that averaging over multiple kibitzes and over several months will produce something usable. In fact, I am already feeling rather optimisitc about the entire idea of using computer engines for puzzle difficulty evaluations. After about 2 months of runs, I am quite confident about Mon/Wed levels, and getting more feel about the difficult ones as well. More engines will be used in the near future, too (Shredder will be coming with their latest for a Mac in the near future; I wish Rybka was ported to Mac/Linux, too).

May-24-07  MostlyAverageJoe: <eblunt: I think the following forced sequence is quicker ... 27 e8 28 Qg8+ Bf8 29 Qxg6+ Ke7 30 Qf6+ Ke8 31 g6 and 32 Qf7++> It is, but there is one more final delay: 31 .. Rdc8 32. Qf7+ Kd8 33. Qxd7#
May-24-07
Premium Chessgames Member
  kevin86: I answered the first part,but I only take half credit because I missed 28 b3!!. Without it,black plays 28... ♕xf1+ and gains two rooks for the queen. black cannot do a thing after the text move as king and queen are under dire threats.
May-24-07
Premium Chessgames Member
  YouRang: <kevin86: I answered the first part,but I only take half credit because I missed 28 b3!!. >

I dunno there kevin, "half credit" might be a little generous. :-)

26. Rf7! was a nice deflection allowing the queen to invade, but I think b3 was the real point of the puzzle. In fact, if the puzzle had been "28. ?" instead of "26. ?", it would still be at least a Wednesday puzzle, IMO.

May-24-07  greensfield: Saw the obvious 26.Rf7 and continuation. Didn't see the not so obvious (to me) 28.b3! This was like a puzzle within a puzzle.
May-24-07  Crowaholic: Missed it by one square (and one move #)... I considered 26. Qh6!? Bc6 27. Rf6!? and Black gets killed in case of 27. ..Bxf6?? 28. gxf6.

Also, 27. ..Rf8? 28. Rxg6+ hxg6 29. Qxg6+ Kh8 30. Qh6+ Kg8 31. g6 occurred to me, with strong White threats.

But Black has 27. ..Rxd1+ 27. Nxd1 Bxe4! which isn't nice for White at all.

Funny enough, I considered b3 in some lines as a way to force the black Q off the a6-f1 diagonal, but because of Qxc3, this is only useful if you have a strong threat on f1.

May-24-07  LIFE Master AJ: Problem of The Day (POTD)
Thursday, May 24th, 2007.


click for larger view

White: Kh1, Qh4, Nc3, Bg2, Rd1, & Rf1; Pawns - a2, b2, e4, g5, & h2. Black: Kg8, Qc4, Bd7, Be7, Ra8, & Rd8; Pawns - a6, b7, e5, e6, g6, & h7.

White to move, (26.???)

May-24-07  LIFE Master AJ: Nice Puzzle, this one definitely gets added to my problem collection.
May-24-07  cloybloy: Quite difficult but I luckily got b3 after the wild Rf7. Maybe because it was easy to see that Rf1 was necessary.
May-24-07
Premium Chessgames Member
  fm avari viraf: Here, Black's King seems to be vulnerable & so White invades the 7th rank with a Rook sacrifice forcing Black to capture. But instead, Black can stave off the mate with 26...h5 then 27.Rxe7 loses a piece & after some resistance would have to give up.
May-24-07  ruzon: I had everything except b3.

I think 23. ... Bd7 was Black's mistake. exf5 seems to win a pawn and avoids the isolated double pawn wall that allows White to invade with Rf7.

May-24-07  Mendrys: Drats, I figured out 16. Rf7 Kxf7 17. Qxh7+ Kf8 but b3 eluded me. I give myself points for seeing that an immediate 28. Rf1 was bad because of Qxf1 and 2 rooks for the queen in this position may have been bad for white. I couldn't find the relatively simple 28. b3 though.

May-24-07
Premium Chessgames Member
  ajk68: Does 26. b3 work?
I had figured out the Rf7 line but saw that the Queen needed to be deflected - I thought I would do that first. Am I missing a response?
May-24-07  unferth: 26 b3 Qxc3 27 Rf7 h5 holds, doesn't it?
May-24-07  Mendrys: <ajk68: Does 26. b3 work?>

Nah, it doesn't appear so. after 26. b3 Qxc3 27. Rf7 h5 28. Rxe7 Qc5 white's attack is halted and he must give up the exchange. Crafty was kind enough to find this for me. I always miss the pawn moves and didn't see 27....h5

May-24-07  Mendrys: Ah, you beat me to it <unferth> and probably without comp assistance to boot!

<YouRang> Based on the many erudite posts you have given us I would say that Yes, you should have gotten it. You have solved tougher puzzles.

May-24-07  unferth: <Mendrys: Ah, you beat me to it <unferth> and probably without comp assistance to boot!> yes--but I didn't see that 28 ... Qc5 wins the exchange (29 Rexd7 Rxd7 30 Rxd7 Qc1+ mates) until you pointed the way. :)
May-24-07  Billosky: Ouch! Missed Rf7 altogether.
May-24-07  tacite: Got Rf7 but I thought that black would have played h5 instead of Kxf7, preventing Qxh7+.
May-25-07  eblunt: <MostlyAverageJoe: It is, but there is one more final delay: 31 .. Rdc8 32. Qf7+ Kd8 33. Qxd7#> Or indeed black can chuck in Qc1+ after g6 to delay the inivitable, but it's still cleaner than having to use b3.
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