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Moshe Pyernik vs Pierre Moulin
EU-ch U20 (1983), Groningen NED, rd 11, Jan-01
Zukertort Opening: Polish Defense (A04)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
Sep-16-15
Premium Chessgames Member
  Phony Benoni: <27.Rxg7> is sheer instinct. With the Black pawn chain cutting off his queenside piece, 27...Kxg7 seems the only alternatve.

Now 28.Qf6+ is most forcing, so try that first. 28...Kh7 29.Qf7+ Kh8 30.Ng6# is easy, so 28...Kg8.

Checks don't lead to anything immediate, but how about 29.Nh5? King can't escape the mate threat on g7, and the only temporary defense is 29...Re7 30.Qxe7. Looks good.

White preferred the rook lift. Fine.

Sep-16-15  TimothyLucasJaeger: I went with 29. Nh5 as well
Sep-16-15  dfcx: 27.Rxg7 looks like the best choice, forcing black to take with king (or Qxh3# next)

27...Kxg7 28.Qf6+ Kg8 (Kh7 29.Qf7+ Kh8 30.Ng6#) 29.Ng6

and black can't defend against 30.Qh8+ followed by 31.Qh7#.

29...Rf8 30.Qh8+ Kf7 31.Qh7+ Ke8 32.Qe7#

29...Re7 30.Qh8+ Kf7 31.Qh7+ Ke8 32.Qg8#

Sep-16-15
Premium Chessgames Member
  agb2002: White has one pawn less.

The black castle is very weak and lacks protection. The white pieces are ready to attack. This suggests 27.Rxg7 Kxg7 28.Qf6+ Kg8 (28... Kh7 29.Qf7+ Kh8 30.Ng6#) 29.Rc3 and Black can't stop Rg3+ followed by mate.

Sep-16-15  ASchultz: Fritz preferred Nh5 here, too.

I got so enamored with the rook lift, I figured Qg6+ Kh8 Qh6+ Kg8 Qg6+ Kf8 Qf6+ (Qh7 is quicker) Kg8 Rc3 reduced to the same thing, not realizing Wednesday problems probably didn't have that many moves.

I don't get ...Rfe8 at all. Fritz really likes Nd5 and Rg8 holds on grimly. But removing the rook from guarding f6 is odd.

Sep-16-15  stacase: Move 28 say check with the Knight or the Queen? Doing it with the Queen insures continued pressure. Making a note to bring the Rook up to the open row if Black's King moves to the back rank seals the deal
Sep-16-15  diagonalley: 27.RxNP! is the obvious try... (easier than yesterday's puzzle)
Sep-16-15  thegoldenband: 26...Nd5 looks pretty reasonable. After 27. Ng6+ Kg8 28. Nxf8 Kxf8, Black has a passed pawn for the exchange and a strong Knight, and if White tries to crudely attack on the K-side (say with 29. Qh5), Black gets serious counterplay very fast.
Sep-16-15  starry2013: So I played through the moves in my mind and thought I hadn't missed anything. I wanted to stop the King escaping to h7, so wanted to use the knight.

Rxg7 looks like the only really good move. King has to take, so forcing.

I was planning Nh5 and then Nf6, to take a square like h7 from the K. Of course I forgot the K could move upwards to g6.

Then I thought I'll do the rook lift, which you have to be quick about as there are weaknesses then on your back rank.

1. Rxg7 2.Kxg7 Qf6+ 3.Kg8 Rc3 4.Qf3 Rxf3 5.Re7 Rg3+ 6.Kh7 Qg6+ 7.Kh8 Qxh6+ 8.Rh7 Ng6+ 9.Kg8 Nf8+ 10.Kf7 Qxh7+ 11.Ke8 Nxe6 12.dxe6 Rg8#

But a rook lift feels like cheating, it shouldn't be necessary.

So back to the simpler and more direct line. This seems the most precise and the solution to me.

1. Rxg7 2.Kxg7 Qf6+ 3.Kg8 Nh5 4.Re7 Qxe7 5.Qxg2+ Kxg2 6.Rf8 Qg7#

What I didn't think about at first was that the computer couldn't play Re7 in defence as it's just unprotected and can simply be taken. Somehow when looking quickly through the possibilities in my mind you assume it can make the move. g7 turns out totally under my control and an easy checkmate situation.

Sep-16-15
Premium Chessgames Member
  cocker: I found this easier than yesterday's. As others have said, 26 ... Rfe8 was Black's big mistake, and 29 Nh5 would have been slightly more efficient.
Sep-16-15  morfishine: <27.Rxg7> crushes
Sep-16-15
Premium Chessgames Member
  TheaN: Hm, the rook lift never crossed my mind. Bad, in a sense that it didn't occur to me at all, good, in a sense that I believed in the power of a queen and knight.

The aforementioned combination is the most tactical combination of two seperate pieces in the game: though a queen and rook are more powerful they don't have the subtlety when a knight is involved.

In the position at hand, it becomes obvious quickly that white has to rely on this interplay to win: the rook is just a battering ram. The piece tandem is so strong that the last move has a non-forcing nature: after 29.Nh5 only 29....Re7 30.Qxe7 Qxg2+ delays mate by two more moves, with 31.Kxg2 and 32.Qg7# to follow.

Sep-16-15  CHESSTTCAMPS: Black has an extra pawn, but has neglected defense of his king. In fact, none of black's pieces defend the king, even as white has directed 2 major pieces plus the knight to that sector.

In any pawn chain, the base pawn is vulnerable. Therefore, 27.Rxg7 Kxg7 (otherwise 28.Qxh6#) 28.Qf6+ Kg8 (Kh7 29.Qf7+ Kh8 30.Ng6#) 29.Nh5 Re7 30.Qxe7 Qxg2+ 31.Kxg2 (any move) 32.Qg7# is the longest that black can avoid checkmate.

Sep-16-15  patzer2: Black's decisive mistake was 26...Rfe8??

Instead, 26...Nd5! gives Black the advantage as play might continue 27. Ng6+ Kh7 28. Nxf8+ Rxf8 29. Qh5 Nf4 30. Qd1 Rb8 31. Kf1 g5 (-1.10 @ 26 depth, Deep Fritz 14).

Sep-16-15  patzer2: Because Black's pieces were out of play on the Queenside, resulting in a weak King position, I immediately started calculating 27. Rxg7! for my Wednesday solution.

I thought the thematic Rook lift 29. Rc3 was essential to the mate. However, as <Phony Benoni> and others point out, White can play 29. Nh5! and mate without the Rook.

In fact, White could have pulled off the mate without the second rook being on the board.

Setting up the position with the second Rook on c1 missing, White plays 27. Rxg7! (diagram below)


click for larger view

and it's mate-in-five after 27...Kxg7 28. Qf6+ Kg8 29. Nh5 Re7 30. Qxe7 Qxg2+ 31. Kxg2 Re8 32. Qg7#.

Sep-16-15  Ratt Boy: Thanks, patzer2. Because you demonstrate that the c1♖ is superfluous, I believe that 29.♘h5 is more chessy than ♖c3.
Sep-16-15
Premium Chessgames Member
  whiteshark: <29.Nh5> (and that's it!) has been my line, too.
Sep-16-15  bachiller: I also went for 29. Nh5.

Another line I considered was 29. Qg6+, K moves. 30. Qxh6+, etc., to recover the position after the 28th move without the h pawn. Then, the black king is an easy prey for queen and rook.

Sep-16-15  PJs Studio: I was planning 29.Nh5 when I was considering the diagrammed position but then as I played through the moves I favored 29. Rc3

It's a 6 -v- 1/2 dozen matter of taste.

Sep-16-15
Premium Chessgames Member
  kevin86: The rook sac chops away black's best defender and the end came soon.
Sep-16-15  reticulate: When I saw that Pyernik had played 29. Rc3, I thought my choice of 29. Nh5 must be flawed in some way. But I could not find a way out for Black. Thanks to all for reassuring me that the rook move is indeed superfluous.
Sep-16-15  Eduardo Leon: <27.♖xg7+ ♔xg7 28.♕f6+ ♔g8>

Not 28...♔h7 29.♕f7+ ♔h8 30.♘g6#. Here I went for a longer finish, eliminating the h pawn before the rook lift.

<29.♕g6+ ♔f8>

29...♔h8 transposes.

<30.♕xh6+ ♔g8>

Not 30...♔e7 31.♕f6#.

<31.♕g6+ ♔f8 32.♕f6+ ♔g8 33.♖c3>

---

While this wins, it isn't the most efficient. What I didn't see was the fact that white can perform the rook lift 29.♖c3 without capturing the h pawn, since 29...♔h7 runs into exactly the same mate as in the comment to black's 28th move.

Sep-16-15  The Kings Domain: Black should have defended his kingside immediately.

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