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Later Kibitzing> |
| May-20-16 | | cocker: It may be instructive to note that the alternative sacrifice 31 Bxe5, is not as good. |
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| May-20-16 | | Underworld: At first I tried looking for pins, but then it became obvious that the knight sac on c5 would allow the dark squared bishop to eat up blacks pawns (3 pawns for a knight is equal) and negate black's threat with the g-pawn. The strong center, bishop pair, and rook on the 7th rank would allow white to apply an ample amount of pressure with a winning position. I didn't see all the moves, but Nxc5, Bxe5, Bxf4 were very obvious. |
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| May-20-16 | | patzer2: For today's Friday puzzle, my instinct is to play 31. Nxc5 as in the game. That's because giving up the Knight for two central passed appears to be a winning plan. However, Fritz and Stockfish indicate White can strengthen the Nxc5 plan by first preparing it with 31. Rb7! The Stockfish program (24081364) at 29 depth on SCID vs PC gives its top two moves as 31. Rb7!  (+2.42) and 31. Nxc5 (+1.87). Stockfish and Fritz both give best play after 31. Rb7! as 31...Nac8 32. Nxc5 dxc5 33. Bxe5 Rxg5 34. Bxf4 Rg4 (diagram below) 
click for larger viewwhen White has the pleasant choice between the two winning lines 35. Kf3 Rxf4+ 36. Kxf4 (+2.58 @ 26 depth,Stockfish 24081364) or 35. Bg3 Ba5 36. Kf3 Rg5 37. Bf4 (+2.78 @ 26 depth, Stockfish 24081364). |
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| May-20-16 | | patzer2: Lest anyone suggest Suttles' "modern" opening strategy 1. c4 g6 is out of date and unplayable, they should take a look at the recent computer game
Protector vs Komodo, 2016 when Black was able to equalize and draw after 4...Nc6. |
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| May-20-16 | | morfishine: <cocker: It may be instructive to note that the alternative sacrifice 31 Bxe5, is not as good> Good point, both need to be looked at |
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May-20-16
 | | scormus: <patzer2 31 Rb7! Nac8 32 Bxc5> I just did the same as you and got the same result with Rybka. I suppose it's gratifying to see the Si agree with my choice .... |
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| May-20-16 | | Razgriz: I was either a Knight Sac or a Bishop Sac to open up the middle for a push. I got the initial sacrifices but I couldn't get anything after that. |
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| May-20-16 | | mel gibson: The computer doesn't play the same moves.
It plays
31. Rb7 Nac8
32 Nxc5
& the 2 passed pawns get broken up & one lost with a black Knight sacrifice.
White still wins. |
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| May-20-16 | | whiteshark: I knew the motif from
- the black side
- hours of in-depth analysis
- here: Team White vs Team Black, 2015 |
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| May-20-16 | | not not: too hard for me, I was thinking about Rb7 bulling the knight into passive position, and then Rb8 increasing pressure knight sacrifice did not enter my mind |
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May-20-16
 | | Sally Simpson: It's one of them puzzles where you must be honest with yourself. Would you have gone for it in a game without the hint 'stop here...White to play and win.' Here of immense value to a student are games not where the combination was played, but in games where one was missed. Your task there is to skip through the note less game and spot the shot. This builds up your ability to recognise a critical position. Of course knowing something was missed heightens your awareness, you have been given a clue, but you should be in this state of awareness when playing. (much easier said than done.) Anyway...Back to this one and if we peel back one move before the Knight sac. (which we have been given the strong hint that something drastic is on.) White has just played 30. Rg1-b1 leaving the g-pawn hanging. 
click for larger viewThis move clearly has designs on the loose a7 Knight and it lack of squares. If 30..Rxg5 then 31.Rb8 covering c8 then Nb6, protect it with the a-pawn or a Bishop and that a7 Knight is in trouble. There does not appear to be too much Black can do to stop this but sit and watch as he loses a piece in broad daylight. In this line after 30...Rxg5 the Knight sac on c5 is is no longer on as the Rook on g5 holds the e5 pawn. Black did not take the g5 pawn and sensing the danger played 30...Ne7 (covering c8 meeting Rb8 with Na-c8). This took us to here...
click for larger view...then came the Knight sac on c5 to get the pawns rolling. This was intuition, 100% concrete analysis is beyond reason. But it's not too hard to spot. Black's position was ripe for a strike of this nature. As mentioned all that need be was the 'Leap of Faith' and to look out for Black saccing back, which he tried to do with 39...Rxc4. 
click for larger viewWhite ignored it and played 40.Bxg6+.
Good Game. |
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| May-20-16 | | YetAnotherAmateur: <patzer2> Thank you for the engine help. My approach was: 31. Rb7 Nc8
32. Nxc5 dxc5
33. Bxe5 Rxg5
34. Bxf4 Rg4
35. Ke3
and now white has everything he needs to push the d or e pawn home, and black has no real options left. |
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| May-20-16 | | kevin86: The knight sac gets the ball rolling. |
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| May-20-16 | | YouRang: My answer for today's puzzle was:
"It probably involve sacrificing a piece for 2 pawns to get connnected passers in the middle of the board". Worth partial credit? |
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| May-20-16 | | beenthere240: I'd say zero credit for you answer, but 50% for having the courage to post it! Some of my answers to puzzles go along the lines of "I imagine there's a piece sacrifice leading to a checkmate or a gain of significant material. If not that then a subtle maneuver." |
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| May-20-16 | | beenthere240: I'm wondering if the sac would have been better on move 30. That way white gets all 4 of black's central pawns. |
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| May-20-16 | | posoo: EVERY KIBBITZER shod pay attention to da MOST PROFUND comment put forth by UNCE. USE DA FORCE is exACTly how to do A-Level SMASHING at chesse! Sometimes it works and somtimes it dos not. BUT AT LEAST you will be able to sleep at night As Thodus Rosavelt said
IT IS NOT DA CRITTIC DAT COUNTS |
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| May-20-16 | | dfcx: I have a hard time deciding between
31.Rb7 followed by Nxc5 and 31.Nxc5 first.
I like the first better
31.Rb7 Nac8 32.Nxc5 dxc5 33.Bxe5 and d6 next is unstoppable. For example, 33..Rxg5 34.Bxf4 Rg4 35.Bg3
click for larger view |
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| May-20-16 | | stst: As "difficult" as stale, one not easy of a smooth endeavor.
Two sac are yelling: Nxc5 or Bxe5. Also a quiet positional Rb7 awaits.
Try some little analyses:
(A)
31.Nxc5 dxc5 (hard to see what's benefit to tolerating this without re-take.)
32.Bxe5 (before Black's Rxg5) Rxg5
33.Bf6 Rh5 (if stays on g, not easy to go back on 7th rank for defense later)
34.d6 Nc8
35.Bxd8 Kxd8
36.e5 Rh7 (to guard White's Rb7 and the d-P)
37.Bxg6 Rg7
38.Bf5 Rg5
39.Bxc8 Kxc8
40.e6 Rg6
41.d7+ Kd8
42.Rb6 etc etc... as said, no tunnel-through yet...
(B)
31.Bxe4 dxe4
32.d6 Nc8
33.d7+ Kxd7
34.Nxc5+ Ke8
35.Rb7 Rxg5
36.Ne6 Rg4
37.Kf3 Rh4
38.Ng7+ Kf8
39.Rd7 Bd7
40.Ne6+ etc etc, looks somewhat more promising, but still quite a while to go... (C)
31.Rb7 Rxg5
32.Nxc5 dxc5
33.d6 Nc6 (Nc8 would allow a fork by dP)
34.d7+ Ke7
?? etc etc - obscure....
see how it actually proceed, somehow may miss something critical?! |
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| May-20-16 | | stst: Glancing through, many (maybe also the engines) agree the more waiting Rb7 should go first.
The take-away is to swing the R to the h-file, as the game showed. Maybe both directions will work through, just a comparison of efficiency.... Would like to see how Komodo/Houdini analyze this one... |
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| May-20-16 | | Cheapo by the Dozen: I am reminded of the time, between rounds of an American Open in 1971 give or take a year, when Walter Browne and Anthony Saidy were analyzing a position, and a shouting match ensued. Browne yelled "You don't know nothing about endgames, Saidy!" Ahem ... |
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| May-20-16 | | Patriot: 30.Rb1 was a nice move, seemingly giving up a pawn but threatening to win a piece. I found the right line, 31.Nxc5 dxc5 32.Bxe5 Rxg5 33.Bf4 but thought it might continue 33...Rh5 34.Rb7 Nac8 35.d6  . It was fun. |
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| May-20-16 | | YouRang: My engine definitely prefers 31.Rb7 here.
As it is, <31.Nxc5 dxc5 32.Bxe5>
click for larger view
Here, black answered with <32...Rxg5>, but the engine thinks black would have been better off with 32...Nac6!
click for larger view If 33.dxc6 Nxc6 34.Bxf4 Bxg5
click for larger view
White is still better, but it's a much more difficult game to win. |
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| May-21-16 | | Geronimo: I'd say <You Rang> gets the credit. It's basically what I said earlier, only more concise. Would I play the text move otb? Yep, but not because I'm courageous or brilliant, it's because I'm reckless and lazy! |
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| Mar-04-17 | | morfishine: Duncan gotta Dunk'n
***** |
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Kibitzing
sac: 31.Nxc5