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Evgenij Alekseyevich Piankov vs Lev Psakhis
Irkutsk (1977)
Benoni Defense: Fianchetto Variation. Hastings Defense Main Line (A64)  ·  0-1
ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Jul-22-08  stacase: So far this must be easy week!
Jul-22-08  realbrob: <regi sidal> 36.Ra1 Rxc1+ 37.Qxc1 Rxc1+ 38.Rxc1 , Black has a queen for a rook and is going to promote the a pawn in a short time. Furthermore, White's bishop is out of the game.

Back rank weakness.. A deadly one!

Jul-22-08  zb2cr: My chess intuition told me the Knight move was right instantly; then I spent over a minute justifying it to myself by working out several of the same lines posted by <dzechiel>.
Jul-22-08  Murphyman: I looked at most of the other lines when solving this but had <realbrob>'s line as the one which put up most resistance. I think this line needed to be considered as part of a complete solution
Jul-22-08  number 23 NBer: 35... Ne3 instantly wins a load of material. 2/2!
Jul-22-08
Premium Chessgames Member
  benveniste: The "least bad" line I found for White is:

36. ♖e1 ♕xb1
37. ♖xb1 ♖c1+
38. ♗f1 ♖xb1
39. fxe3

White's only down an exchange, but will soon lose the bishop or allow the a-pawn to queen.

Jul-22-08
Premium Chessgames Member
  patzer2: For today's Tuesday puzzle solution, Black springs a winning double attack with 35...Ne3!

See <dzechiel>'s post for a good analysis of Black's multiple decisive threats.

Jul-22-08  JG27Pyth: <The "least bad" line I found for White is: 36. Re1 Qxb1
37. Rxb1 Rc1+
38. Bf1 Rxb1
39. fxe3>

Well, black could play
38...Nxf1 and go up a full piece, but actually I think 38...Rxb1 remains better because after

39. fxe3

39...Rc1 will win the bishop... (if white tries to defend the Bishop:

40. Rf2? Rxf1+
41. Rxf1 Rxf1+
42. Kxf1 a3 )

Jul-22-08
Premium Chessgames Member
  johnlspouge: Tuesday (Easy): Black to play and win.

Material: N for B. Black has a battery Rc8 and Rc5. The Nc4 can expose the battery, with a double attack on Rc1, which Qb1 alone defends. The White Kg1 has 3 flight squares. Wishful thinking shows that the Black pieces can cover all of them, with a R at c1 and the N at e3. Mate threats on Kg8 take precedence over the attack by White Qb1 on the undefended Qb4.

Candidates (35…): Ne3

35…Ne3 (threatening 36…Rxc1 37.Qxc1 Rxc1+ 38.Bf1 Rxf1#)

White has no feasible defense.

(1) 36.Rc1 moves

36…Qxb1 37.Rxb1 [else, lose a Q for Ne3 at best]

37…Rc1+ 38.Bf1 [Rxc1 leads to the mate above] Rxb1 39.fxe3

Black has won the exchange (although a deeper analysis demonstrates Black can win the pinned Bf1).

(2) 36.Ra1 Rxc1+ 37.Qxc1 Rxc1+ 38.Rxc1

Black now saves Ne3 and has Q for R.

Jul-22-08  JG27Pyth: Oh. duh... <Benveniste> somehow I missed the part at the end where you wrote... <White's only down an exchange, but will soon lose the bishop or allow the a-pawn to queen>... so uh, yeah, my analysis confirms that :)
Jul-22-08  TheaN: 2/2

I'm gonna use a somewhat different format from now on: I've seen yesterday that for such an easy combination as yesterday was I still had quite a big post because I single out every move. When something is forced or obvious, I can just connect it to the first move, so I'll do that from now on. Also, I'm switching move-order: the fastest losing reply first, main line as last (so I don't have to switch back to it).

-ML-
<35....Ne3>

Is a crushing discovery exploiting the strong Black files (especially c) whilsts threatening mate if White were to take material, as the Knight covers both g2 and f1. The variations are pretty much first move reply only.

--A--
<36.Qxb4>

Loses immediately due to the strong Black Rooks. But now, Black actually needs only one as he mates on the back rank.

<36....Rxc1† 37.Qe1 Rxe1† 38.Bf1 Rxf1‡>

0-1

--B--
<36.fxe3>

Obviously loses a lot of material, but it is White's second best move to avoid mate.

<36....Rxc1† 37.Qxc1>

Without Qxc1 White would lose both Q+R for N to Rxb1, now it's only, Q for N >_>.

<37....Rxc1†>

--C--
<36.Re1>

White's most stubborn try, delaying the Knight capture, protecting the Queen and avoiding Rxc1. Still, Black has forcing replies.

<36....Qxb1 37.Rxb1 Rc1† 38.Bf1 Nxf1>

Way more effective than Rxb1 that I've seen, as the c8-Rook is still defending Rc1, and Rb1 is in whilsts Black STILL threatens mate, and White cannot defend against a new Ne3† or to lose Rb1.

Jul-22-08  TheaN: No sorry, of course after <38....Nxf1?! 39.Rxc1 Rxc1 40.Kg2!?> Black will actully lose a4 and go into an endgame with a piece up: although winning, <38....Rxb1 39.fxe3 Rcc1 40.Rf2 Rxf1†! 41.Rxf1 Rxf1† 42.Kxf1 a3> wins way easier. I'm still counting the point though: I just thought Nxf1 was faster, I wouldn't have played it OTB. And even then, it's still winning ^^.
Jul-22-08  cracknik: Too easy for Tuesday.Should be a Monday puzzle.
Jul-22-08  MiCrooks: After several weeks of harder than normal puzzles early in the week, we are back to no brainers for the last two days.
Jul-22-08
Premium Chessgames Member
  kevin86: Funny,I saw the solution-then dismissed it as too easy.

It works:

36 ♖xc5 ♕xb1+ 37 ♖c1 ♕xc1+ 38 ♗f1 ♕xf1#. or

36 ♕xb4 ♖xc1+ 37 ♗f1 ♕xf1# or

36 fxe3 ♖xc1+ 37 ♕xc1 ♖xc1+ wins queen for a knight.

Jul-22-08
Premium Chessgames Member
  whiteshark: An easy one-mover!
Jul-22-08
Premium Chessgames Member
  YouRang: Well, I spent a bunch of time looking at this before finally seeing the light. :-(
Jul-22-08  Kasputin: Material is even but the white king's position is vulnerable.

35 ...Ne3
Now white's king no longer has the f1 and g2 squares available. This is important because if white chooses to capture either the black queen or the c5 rook next turn, then black can force checkmate: a) 36. Qxb4 Rxc1+ 37. Bf1 Rxf1# or b) Rxc5 Qxb1+ and white can only throw the c5 rook and the h3 bishop in the way but again cannot stop mate.

36. fxe3
What else can white do? Black was threatening Rxc1 with the same mating idea as above. If 36. R(a)c2 then black has at least a couple of choices. One is to trade queens and then pick off the rook with ...Nxc2. Or black can play 36 ...Rxc2. Again, the same mating idea is at work, so white cannot for example capture the queen (e.g., 37. Qxb4 Rxc1+, etc..). If white plays 36. Ra1, then ...Rxc1 and again black is ahead in material after all the exchanges. That plus a passed a pawn makes white's position hopeless.

36 ...Rxc1+
37. Qxc1 Rxc1+

Again, things are hopeless for white. Black has won too much material and white has no real counterplay.

Jul-22-08  Kasputin: Didn't really think about 36. Re1 - but the analysis of others kibitzers makes sense re. that move.
Jul-22-08  MiCrooks: There is really no difference between Rd1, Re1, and Rf1!! And they all lose readily to the same move Qxb1 so not sure what the fuss is about.

The reason they are no different is because after Rxb1 they lead to the same position. And if Black does something different like Nxf1 or Nxd1 then Qxb4 is winning for White.

Jul-22-08  Halldor: I also went for the right Knight move, but not because of intuition - more because of some daydreaming - seeing a possible mate if White takes the queen. After a long time I was convinced that White had no defence.
Jul-22-08  234: Monday puzzle Jul-21-08 <8. ...?> Iverhov vs Ilianako, 1957
Jul-22-08  Artar1: This was an easy one-mover.
Jul-22-08  get Reti: At first I tired to check the white king with an eventual Nf3+, then I realized it is more important to cover his escape square, f1.
Jul-23-08  TheaN: <MiCrooks: There is really no difference between Rd1, Re1, and Rf1!! And they all lose readily to the same move Qxb1 so not sure what the fuss is about.>

There's no real 'fuss': it's both intiutive and logical to go to a square that's not unattacked by a lower-valued piece. That that does not make any difference in this position is irrelevant. Actually, with Rd1 and Rf1, White just delays Black's attack, where Re1 allows a potential Rxe3 (fxe3 in the arising position would be the only move to safe White, and so it does with Rd1 and Rf1) so Black should watch out afterwards.

The only 'pro' of Rd1 or Rf1 compared to Re1 is the fact that human impulsivity exists: espicially around the 40th move, Black might be grabbish with Nxd1 or Nxf1 respectively, giving away Queen for Rook. But I doubt that would happen.

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