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|Apr-28-08|| ||johnlspouge: Monday (Very Easy): White to play and win.
Material: B for N. The White Bc4 and Rf1 have a strong attack on Pf7, which is pinned to Kg8. The Black Re8 attacks Qe3. Black is vulnerable to back-rank mates, so Qd7 must protect Re8.
Candidates (20.): Rxf7
20.Rxf7 (threatening 21.Rxd7+)
Because the Black Qd7 must protect Re8 while the back-rank mate threat is in force, he has as feasible options:
(1) 20…Rxe3 21.Rxd7+ Kf8 22.Rxc7
and White is ahead B+2Ps for N.
(2) 20…Qxf7 21.Qxe8# (not very feasible, admittedly)
(3) 20…Qc8 [Qd8 is similar] 21.Rc7+ then 22.Rxc8
Time to peek. My line is not as good as 20…Rxe3 21.Rf6+ in <dzechiel>'s post. Experience shows.
Emmanuel Lasker said: "If you see a good move, look for a better one."
As Mondays go, this puzzle was relatively tough.
|Apr-28-08|| ||thitho: the fact is that Re8 is probably the worst move possible in this situation. What could have black done, instead of this?
I, as a stupid hedgehog, would have played 19, ... Qe7. I don't see a point to make Na5 (the bishop will calmly go on d3 to transpose threat).
What else? And if black does not make this terrible mistake, does white have more than a draw?|
|Apr-28-08|| ||realbrob: <Terry McCracken> Are you sure there is a real solution of your puzzle?|
|Apr-28-08|| ||TheaN: <Time to peek. My line is not as good as 20…Rxe3 21.Rf6+ in <dzechiel>'s post. Experience shows.>|
Eh, actually, Rf6+ is not the most optimal line. My analysis of Rxd7 and Rf6+ above was ~20 ply, but on 26 ply, Rxd7+ has even risen to 4.74 whilst Rf6+ remained at 4.21. It's just what the easier win is. Rook/pawn to Knight, or four pawns to one pawn. In the situation however, Fritz thinks it's the pawn advantage, and so did I.
|Apr-28-08|| ||johnlspouge: <<TheaN> wrote: Eh, actually, Rf6+ is not the most optimal line. My analysis of Rxd7 and Rf6+ above was ~20 ply, but on 26 ply, Rxd7+ has even risen to 4.74 whilst Rf6+ remained at 4.21.>|
Given the choice of the two lines, I still prefer Rf6+. Although computers are very useful, the positions on Saturday and Sunday this week reinforced my growing suspicion that computer evaluations (even to arbitrary depth) do not reflect individual preferences. Different people can legitimately prefer different ways to win.
If I quit when I was ahead, however, that's nice to know. Thanks, <TheaN>!
|Apr-28-08|| ||lost in space: first thought is 20. Rxf7 Rxe3 21. Rxd7+. White will win more pawns on the 7.rank. Would not spend more time on better lines OTB|
|Apr-28-08|| ||kevin86: A strange Monday puzzle. I don't think I found the best answer:|
Either after 20 ♖xf7 ♖xe3 21 ♖f6+ ♕e6 22 ♖xe6 and white is up a pawn or...
21 ♖xd7+ ♔f8 22 ♖xc7...white is up TWO pawns.
Is there a better move?
|Apr-28-08|| ||YouRang: I found 20.Rxf7 Rxe3 21.Rxd7+ Kf8 22.Rf7+ (a semi-windmill?) Ke8 23.Rxg7 (with either the h7 or c7 pawn to fall next, unless...) Re7 allowing an exchange of rooks going into the endgame two pawns ahead -- should be an easy win for white.|
I see now that white had a bit stronger move with 21.Rf6+!, forcing 21...Qe6 22.Bxe6+ Rxe6 23.Rxe6 leaving white up the exchange and a pawn in the endgame, also winning easily.
|Apr-28-08|| ||234: Sunday puzzle <25. ?> Apr-27-08 Igor Ivanov vs Kudrin, 1989|
|Apr-28-08|| ||JohnBoy: <McCracken> - nice puzzle, but I don't think it's too brutal. After 1...Rxd2 2.Bxd2 Nd4 3.Q somewhere Nxf3+ white is faced with the awkward choice of 4.Bxf3 Bxf3 and black has lots of nice entry moves (like ...Qh1+ or ...Ng4 or ...Nxe4), or else giving back the exchange and black has great initiative.|
|Apr-28-08|| ||Magic Castle: <JohnBoy> Please edit your post as it is confusing. You may start with 20. Rf7 Re3 (if 20...Qf7 21. Qe1 mate-black queen is pinned by the bishop)21.Rf6 Qf7( Not 21....Qd6 as <You Rang> suggested since black will lose the exchange) 22. Rf7 Re8 23. Rc7 Kh8 24. Rb7 winning two pawns. <YouRang> first impression is correct.|
|Apr-28-08|| ||dzechiel: <Magic Castle: <JohnBoy> Please edit your post as it is confusing. You may start with 20. Rf7 Re3 (if 20...Qf7 21. Qe1 mate-black queen is pinned by the bishop)21.Rf6 Qf7( Not 21....Qd6 as <You Rang> suggested since black will lose the exchange) 22. Rf7 Re8 23. Rc7 Kh8 24. Rb7 winning two pawns.>|
Magic - JohnBoy is responding to a different problem posted by McCracken earlier in the kibitzing.
|Apr-28-08|| ||Terry McCracken: <realbrob: <Terry McCracken> Are you sure there is a real solution of your puzzle?>|
|Apr-28-08|| ||Terry McCracken: JohnBoy: <McCracken> - nice puzzle, but I don't think it's too brutal. <After 1...Rxd2 2.Bxd2 Nd4> |
You are right up to 2..Nd4 the next move is 3. fxg4..Nxg4
|Apr-28-08|| ||wals: B Rosican - Adrien Hervais, IBCA W-Ch Brno CZE
Analysis by Fritz 11: depth 23/39 time 3min 4sec
1. (4.29): 20...Re8xe3 21.Rf7xd7+ Kg8-f8 22.Rd7xc7 Re3-e1+ 23.Kg1-h2 Re1-b1 24.b2-b3 Rb1-c1 25.Rc7-f7+ Kf8-e8 26.d4-d5 Nc6-d4 27.Rf7xg7 Rc1xc3 28.Rg7xb7 Rc3-c2 29.a2-a4 h7-h5 30.Kh2-g3 h5-h4+
20.Bxf7 Depth 24/37 time 3min 3sec
1. (-0.66): 20...Qd7xf7 21.Rf1xf7 Re8xe3 22.Rf7xc7 Re3-e7 23.Rc7xe7 Nc6xe7 24.a2-a4 Kg8-f7 25.Kg1-f2 Kf7-e6 26.Kf2-e3 Ne7-d5+ 27.Ke3-e4 Nd5-f6+ 28.Ke4-e3 Ke6-d5 29.Ke3-d3 h7-h5 30.c3-c4+ Kd5-d6 31.Kd3-e3 g7-g5 32.d4-d5 Kd6-e5 33.Ke3-d3 h5-h4
|Apr-28-08|| ||sleepyirv: Very interesting Monday puzzle. The principle seems rather obvious (bishop and rook, back row mate maybe) and black is demanding some punishment for sloppy defense. I settled on RxF7, but I still don't feel very comfortable with the move.|
|Apr-28-08|| ||patzer2: For today's "easy" Monday solution, White
plays 20. Rxf7! with multiple discovered check threats.
If 20...Qxf7??, then the pin allows White
to win immediately with 21. Qxe8#. If Black plays 20...Rxe3, then the two discovered check combinations described by <dzechiel>, <YouRanq> and others easily win decisive material.
My favorite is 20. Rxf7! Rxe3 21. Rf6+! Qe6 22. Bxe6+ Rxe6 23. Rxe6 , when with a full exchange and a pawn up White wins easily. However, the line 20. Rxf7! Rxe3 21. Rxc7+ , giving White a clear two pawn advantage, should also be sufficient.
|Apr-28-08|| ||DavidD: Normally these Monday puzzles are one or two variations one or two moves deep. This puzzle is a very nice analysis problem. The initial move (Rxf7) is easy to see. The problem comes after 20. Rxf7 Rxe3 and now evaluating the variety of ideas mentioned in other posts: Rf3+??, Rf6+ or Rxd7+. These "little" branches are often easy to miss, yet need to be calculated. I finally decided on Rxd7+ because, well, a queen is a queen. Overall, a very nice puzzle.|
|Apr-28-08|| ||Inkstud: A trifle.|
|Apr-28-08|| ||Lightboxes: I like this series of moves.
22.Rxf7, Re8 or ...
and white is up by 3 pawns.
|Apr-28-08|| ||Magic Castle: <JohnBoy> Opps sorry. <DavidD> But did you not see the potential mate after 21. Rf6+ If the King moves to h8 Rf8 mate. So the move 21.... Qf7 is forced, and black gives the queen back and two more pawns by 22. Rf7 Re8 (to avert mate). 23. Rc7+ King moves and 24. Rb7. Of course as pointed out by <YouRang> 21....Qd6 loses the exchange.|
|Apr-28-08|| ||DavidD: MagicCastle, your line is confusing. I saw the line posted by others here: 20. Rxf7 Rxe3 21. Rf6+ Re6 which stops the threats you mention. Now best is: 22. Bxe6+ Qxe6 23. Rxe6 leading to a winning R+N ending. It's more of a matter of taste between 21. Rf6+ or 21. Rxd7+. Both are wins.|
|Apr-28-08|| ||DarthStapler: Got it|
|Apr-29-08|| ||JohnBoy: <McCracken>: A slight request - next time tell me (us) that I need to consider the possibility of 3.fxg4 - and let me find the follow-up. That way <I> have to justify my initial choice of moves!|
|Apr-29-08|| ||Terry McCracken: < JohnBoy: <McCracken>: A slight request - next time tell me (us) that I need to consider the possibility of 3.fxg4 - and let me find the follow-up. That way <I> have to justify my initial choice of moves!>|
Sure...there's still more. You find the rest and post the solution.
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