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Stefan Schneider vs Thomas Beerdsen
Bundesliga (2015/16), Muelheim GER, rd 15, Apr-24
Bogo-Indian Defense: Grnfeld Variation (E11)  ·  0-1


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sac: 38...Rxd4 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
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Premium Chessgames Member
  ChessHigherCat: The theme of the puzzle must be to divert the queen to enable Bf3 with inevitable mate to follow. The only question is whether to play Nxe5 or Rxe5. It's a tough call but I think Nxe5 is better because if Bxe5 Rxe5 and the poor Q can't prevent Bf3 and protect the B on b5 at the same time.
Premium Chessgames Member
  FSR: <GSM> Didn't see that. Yes, that looks like a problem for Black.

I rejected 21...Rxe5 22.Bxe5 Nxe5 because of 23.f4, when 23...Qxg3+ 24.Qg2 Nf3+ 25.Rxf3 Qxf3 26.Qxf3 Bxf3 or 23...Ng4 24.Qg2 Qxg2+ 25.Kxg2 Nxe3+ didn't seem as clear as I would have liked. Looking at it now with Komodo, it seems that 23...Qxg3+ 24.Qg2 Qxe3+ followed, after an interposition, by 25...Nf3+, would be a much stronger way to proceed.

Premium Chessgames Member
  ChessHigherCat: <GSM> Alas, the "poor Queen" can take b7, as you say, so the game line must be better.
Jan-03-18  NBZ: Like <FSR> I had 21. ... Nxe5, but <GSM>'s 23. Qxb7 is a strong riposte.

After 21. ... Rxe5, 22. Bxe5 Nxe5 23. f4 is the critical line, and here Black has to play 23. ... Qxg3+ 24. Qg2 Qe3+ 25. Qf2 Nf3+, which is very strong for him but still somewhat murky. It was to avoid this line that I went for 21. ... Nxe5.

In the game line, it's not clear to me why White resigned so quickly. With a R and B against Q and P, White might justly have played on. Of course after something like 24. Bg2 Qb3 25. Bd4 Bg6, it's hard to stop Black's plan of pushing the b-pawn towards victory, but that's still several moves down the line.

Premium Chessgames Member
  al wazir: My move was 21...Nxe5.

If 22. f4, then 22...Qxg3+. White loses a bunch of material.

If 22. Qg2/Qh1, then 22...Nf3+

If 22. Bxe5, then 22...Rxe5 and

A) 23. Qb1/Qc4/Qd3 24. Bf3, with mate to follow.

B) 23. Qxe5 Bf3 with mate to follow.

C) 23. Qg2/Qh1/Qh4: black swaps ♕s, followed by Rxb5, and black is up a piece.

But oh dear! there's also

D) 23. Qxb7. Black has to move the ♖ and there's no win.

Premium Chessgames Member
  Dionysius1: I didn't like 22 ♖xe5 because of 23 ♕h1 but CG's Stockfish engine gives mate in 3 after 23 ...♕xh1
Jan-03-18  Sularus: the f3 square is weak with the white queen as its only guard. Therefore, RxP should start the combination.
Jan-03-18  Moszkowski012273: Lol at everyone that went with ...Nxe5

(Myself included)...

Jan-03-18  saturn2: 21..Rxe5 appeared strong to me. Queen and bishop are attacked. If 22 BxR NxB there is the threat of 23..Nf3+ If 23 QxNe5 then 23..Bf3 comes.
Jan-03-18  AlicesKnight: Black wants to play ...Bf3. 21.... Rxe5 seems to gain advantage. If 22.Bxe5, then ...Nxe5 threatening ...Nf3 and if the Q takes then ...Bf3 is deadly. If the Q retreats to g2 or h1 Black exchanges and wins a Bishop. Let's see - yes; that was the other possibility, a slow drawn-out win.
Jan-03-18  Mayankk: It was indeed a toss-up between a rook sac or a knight sac at e5. The only reason why I went for Re5 first is because I thought Ne5, captured back by Bishop and then Re5 may lead White to play Qh4 and thereby prolong the game a bit.

As it turns out, it is not Qh4 but rather Qb7 which spoils the fun for those who played Ne5 first. So I solved the puzzle but had incorrect rationale...

Jan-03-18  mel gibson: Easy to see - it's all about diverting the white Queen.

The computer says:

21. Qxe4 Rxe5 (21. .. Rxe5 (♖e8xe5 ♗b5xc6 ♖e5xe4 ♗c6xe4 ♕h3-e6 ♗e4-g2 ♗h5-g6 ♖a1-c1 ♗g6-e4 ♗g2xe4 ♕e6xe4 ♖c1-c5 h7-h6 ♗b2-d4 a5-a4 ♖f1-c1 ♖a8-b8 ♖c1-c4 ♕e4-b1+ ♖c4-c1 ♕b1-a2 ♖c1-a1 ♕a2-e2 ♖c5-c7 b7-b5 ♗d4-c5 ♖b8-d8) +1.99/23 241)

score for Black +1.99 depth 23.

I played it out at 5 seconds per move & it went up to about 90 moves for Black to win.

Premium Chessgames Member
  MrSpock: I went for 21. ... Nxe5 but this is not winning: 22. Bxe5 Rxe5 23. Qxb7 =
Premium Chessgames Member
  agb2002: Black has a bishop and a knight for the bishop pair.

White is about to play Qg2.

Black can take advantage of the position of White's queen and LSB to incorporate another piece into attack with 21... Rxe5:

A) 22.Bxe5 Nxe5

A.1) 23.Qxe5 Bf3 and mate in two.

A.2) 23.Qg2(h1) Nf3+ 24.Qxf3 Bxf3 and mate next.

A.3) 23.f4 Qxg3+

A.3.a) 24.Qg2 Nf3+ 25.Rxf3 (25.Kh1 Qh4+ and mate next) 25... Qxf3 wins two pawns at least.

A.3.b) 24.Kh1 Bf3+ (or Nf3) wins decisive material.

A.4) 23.Bd7 Nxd7 24.Qxb7 Rb8 with two pieces for a rook and keeping the attack. For example, 25.Qg2 Qf5 26.f3 Qe5 27.e4 Rb2.

B) 22.Qg2(h1) Qxg2(h1)+ 23.Kxg2(h1) Rxb5 - + [n+p].

C) 22.Qc4(d3) Bf3 and mate soon.

Premium Chessgames Member
  malt: Went for
21...R:e5 22.B:e5 N:e5 23.Bd7 N:d7
Jan-03-18  Cheapo by the Dozen: I like this one.

We want to get the bishop to f3, and hence to displace the queen first. Material is even, so forcing White to sacrifice to avoid mate can suffice.

The simplest approaches don't quite work. But wait! Getting the knight to e5 adds a new threat at f3. So our main line is:

21 ... Nxe5
22 Bxe5 Rxe5 forking queen and bishop.

The mate threat forces White to concede the piece.

Jan-03-18  Cheapo by the Dozen: Oh wait.

The 21 ... Nxe5 move order has a problem.

21 ... Nxe5
22 Bxe5 Rxe5
23 Qxg7

Now White is defending against mate and also threatening mate himself, which inhibits Black from snatching a piece. Whoops!

Premium Chessgames Member
  Jimfromprovidence: Just adding a quick point that white could not continues the game with 24 Bxb7 because of 24...Rb8.

click for larger view

Jan-03-18  BOSTER: < FSR:21...Nxe5 with winning material>. This is wrong. After 21... Nxe5 game is equal.
Premium Chessgames Member
  Penguincw: Wednesday puzzle. I haven't messed up a POTD this week, or since last year.

And well, I kinda got this one. I got 21...Rxe5, and calculated that if 22.Bxe5, then 22...Nxe5 23.Qxe5 Bf3, mate to follow, with most other cases being significant loss of material.

I wasn't sure what to do if white played 22.Qh4, but using e8, I see 22...Qxh4 23.gxh4 Rxb5, winning the bishop.

I did not anticipate 22.Bxc6, but OTB, I would've played 22...Rxe4 23.Bxe4, and I like black better.

Jan-03-18  newzild: My first miss of the year.

Like most other people, I played the incorrect 21...Nxe5, which is only equal after 22. Qxb7.

Premium Chessgames Member
  ChessHigherCat: <newzild: My first miss of the year.>

lol, me too!

Jan-03-18  saturn2: <newzild 21...Nxe5, which is only equal after 22. Qxb7> This one looses at once. White has to play 22 BxNe5 first.
Premium Chessgames Member
  AylerKupp: I don't know, after 21.Qxe4 Beerdsen could have "pulled an Inarkiev" after 21Rxe5 22.Bxe5 Rxe5 23.Qxb7

click for larger view

Now, if 23Nf3+ , Beerdsen could have quickly played 24.Qxa8+ and maybe Schneider would have resigned since it's obvious that if 24Qc8, 25.Qxc8#.

click for larger view

Funny enough but, sad to say, something similar happened to me a long time ago. I don't remember the exact position but, as Black, I was comfortably ahead in material and had an easy win. This was the pertinent placement of the pieces although there were several other pieces on the board.

click for larger view

I had just played 1Rxf2. White then quickly played 2.Rc8+ and very loudly called "CHECK!". My "friends", who were watching the game, all burst out laughing. Surprised, flustered, embarrassed, and disgusted for falling into such an obvious back rank "mate" swindle, I resigned. Focused on my attack, I had not considered 2.Rc8+ and didn't see that 2Rf8 would have been a discovered check. So, after 3.Kh1 Rxc8, I would have been even further ahead in material.

I sure wished I would have calmly and quietly played 2Rf8 after a few seconds thought and after my opponent then played 3.Rxf8 and loudly called "MATE"!, I would have calmly said "I'm sorry, but your move is not legal."

Oh well, chalk another one off to experience. And my pride was somewhat salvaged by the fact that none of my "friends" saw that 2Rf8 would have been a discovered check either, or at least none of them mentioned it.

Jan-03-18  Cheapo by the Dozen: Ack for my b7/g7 typo. Insult added to injury. :(
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