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Thomas Beerdsen vs Friso Nijboer
Batavia (2018), Amsterdam NED, rd 4, Feb-26
Formation: King's Indian Attack (A07)  ·  1-0



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Kibitzer's Corner
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Premium Chessgames Member
  agb2002: Black threatens Rxf7.

The black queen controls g4. This suggests 19.Be3:

A) 19... Qxe3 20.Rxd7 Kxd7 21.Qg4+

A.1) 21... Kd6 22.Qg6+ Kc(d,e)7 (22... Bf6 23.Qxf6+ and 24.Qxh8 wins a rook) 23.Qxg7+ and 24.Qxh8 wins a rook.

A.2) 21... Kc(e)7 22.Qxg7+ and 23.Qxh8.

A.3) 21... Kd(e)8 22.Qxg7 with the double threat Qxh8+ and Qxb7.

B) 19... Qd6 20.Bxc5 wins a pawn at least (20... Qxc5 21.Rxd7 as in A).

C) 19... Qb4 20.Rxd7 as above.

D) 19... Qh4 20.Rxd7 Kxd7 21.Bxc5 wins a pawn at least.

Premium Chessgames Member
  al wazir: I found 19. Be3, but I didn't expect black to give up his ♕. I thought the game would continue 19...Qxe3 20. Qg5 Rhc8 21. Qxg7, with even material.

If white has something better, I didn't see it.

Jun-12-19  jith1207: Very interesting and a sudden hike in my week's daily puzzle solving uphill climb.

Needless to say, Diagonalley no points....

Jun-12-19  patzer2: Tough Wednesday puzzle. I went for 19. Rxd7 Qxd7 20. Be3 ± (+0.97 @ 31 ply, Stockfish 10) because I couldn't see anything better.

What I missed is that the piece sacrifice offer 19. Be3! +- (+4.81 @ 26 ply, Stockfish 10) is decisive, regardless of whether Black accepts or declines it.

If 19. Be3! Qxe3, then 20. Rxd7 Kxd7 21. Qg4+ Kd8 22. Qxg7 +- (+18.21 @ 22 ply, Stockfish 10) gives White an unstoppable attack.

P.S.: So where does Black go wrong? Black's decisive mistake is 17...0-0-0? 18. Rxf7 +- (+5.29 @ 29 ply, Stockfish 10).

Instead, 17...Qd7 18. Ne4 Nd4 ⩲ (+0.35 @ 29 ply, Stockfish 10) holds it near level.

Earlier in the opening, instead of 5...Ne7 6. d3 ± (+0.82 @ 27 ply, Stockfish 10), I prefer 5...Nf6 = (+0.05 @ 31 ply, Stockfish 10) with a level position.

Two more 5th move alternatives which have scored well OTB for the second player are 5...g6 = as in the draw in K Piorun vs S Shankland, 2017 and 5...Nc6 as in Black's win in Fressinet vs A Korobov, 2017.

Jun-12-19  Cheapo by the Dozen: My analysis was exactly like <al wazir>'s.
Jun-12-19  scormus: The only move that I could find to work is 19 Be3 (AGB2002 line A), but I didn't think of ... Qxe3 as a reply
Jun-12-19  saturn2: Black seems better developed but if its queen were not on the 4th rank white has Rxd7 followed by Qg4 So I looked at

19 Be3

a 19...Qxe3 20. Rxd7 Kxd7 21. Qg4+ Kd8
22. Qxg7 Re8 material still even but now
23. Nd5 attacks the queen and threatens Qc7

b 19...Qb4 20. Rxd7 Kxd7 21. Qg4+ Kd8 22.Qxg7 By the double attack on h8 and b7 white wins a piece

c 19...Qh4 20. Bf2 Qg5 21. Bh3 (pinning the rook d7) Nd4+ 22.Ne4 Bxe4+ 23. dxe4 white wins an exchange

Jun-12-19  et1: What about Bh3 ?
Jun-12-19  1stboard: 19 .... Rf7 ???
Premium Chessgames Member
  whiteshark: <19.Be3!> to deflect Black's ♕ from protecting sq g4.
Jun-12-19  saturn2: <19 et1: What about Bh3> Black wins by 19..Nd8+ followed by Nxf7
Jun-12-19  saturn2: <et1 19. Bh3> Nf8+ is a trickier than I thought because of 20. Rf3

But 20...Rf8 21. Bxd7+ Kxd7 should still win for black.

Jun-12-19  TheaN: Ah yeah obviously. I saw the game line almost in its entirety, realizing that Black doesn't really have a game after 19....Rxf7 20.Bxd4 +-.

The accept line is more critical as it gives White to slip up as I did. I was way too keen on the 'threat rather than execution' playing <19....Qxe3 20.Qg4?! ±<>> threatening to take on d7 but after Qd4! or Rhd8! White still has a good position but with even material.

After <19....Qxe3 20.Rxd7!> White goes in immediately rather than threatening. After <20....Kxd7 21.Qg4+ +-> the Black position collapses.

Switch-the-move. One of the more important tactical motives :>

Jun-12-19  TheaN: Fyi for those paying attention, the victor was the loser yesterday.
Jun-12-19  mel gibson: I didn't see that.
There are so many safe looking moves for the Black Queen to escape that I couldn't see why Black would sac its Queen.

Stockfish 10 agrees with the text moves:

19. Be3

Be3 (♗c1-e3 ♖d7xf7 ♗e3xd4 e5xd4 ♘c3-e4 ♗g7-f8 ♕d1-h5 ♖h8-h7 ♘e4xc5 ♗f8xc5 ♕h5xc5 ♖f7-f6 ♖a1-g1 ♔c8-c7 ♗g2-e4 ♖h7-f7 a2-a4 b5xa4 ♖g1-g8 ♖f7-d7 h2-h4 ♖f6-e6 ♔h1-h2 ♖e6-e5 ♕c5-c4 a4-a3 b2xa3 ♔c7-b6 ♖g8-g6 ♖e5-c5 ♕c4-b4+ ♖c5-b5 ♕b4-a4 h6-h5 ♔h2-g3 ♖b5-c5 c2-c4 ♔b6-c7 ♕a4-b3 ♖c5-e5 ♗e4-d5 ♖e5-e7 c4-c5 ♖e7-g7 ♖g6xg7 ♖d7xg7+ ♔g3-f2 ♘c6-d8 ♕b3-b6+ ♔c7-c8 c5-c6) +6.06/36 140)

score for White +6.06 depth 36

Jun-12-19  et1: Saturn2 - many thanks.
Jun-12-19  TheaN: <saturn2: <et1 19. Bh3> Nf8+ is a trickier than I thought because of 20. Rf3

But 20...Rf8 21. Bxd7+ Kxd7 should still win for black.>

In fact 20.Rf3 is White's only proper defense against the discovered check (after 20.Bg2 (making Bh3 pointless) Bxg2+ 21.Kxg2 Rxf7 -+). Because 20.Rf3 is forced, 19...Nb4+! is actually superior: 19....Nb4+ 20.Rf3 Rf8 21.Bg2 (Bxd7 loses quicker) Bxf3 22.Bxf3 Nxc2 -+ and White's done.

Premium Chessgames Member
  gawain: (In my initial comment I meant 19 Be3 of course. Not 19 Qe3.)

It's interesting how important it is that both of Black's bishops are suddenly en prise after 19 Be3 Qxe3 20 Rxd7 Kxd7. Black's rook (on d7 in the puzzle position) was doing too much work.

Premium Chessgames Member
  master8ch: What's wrong with 19.Bh3, attacking Black's rook at d7 and bishop at g7?
Jun-12-19  bschak8178: After 19. Bh3, a move like 19. ... Nb4+ discovers check and white will lose the f7 rook one way or another.
Jun-12-19  Amarande: Have I missed something or did Black resign rather soon?

It seems like it could continue 22 ... Rhf8 23 Nd5 Ne7 24 Qd6+ (not 24 Nxe7?? Rf1+ and mate next move!) Ka8 25 Nb6+ Ka7 26 Bxb7 Kxb7 27 Nd5 (threatening mate in two) Nxd5 28 Qxd5+ Kb6 after which it appears difficult to convert White's advantage (Q for R+B, better pawn structure) - there is no mating attack and Black's pieces protect each other really well.

Jun-12-19  Sally Simpson: ***

I think you are right Amarande,

click for larger view

22...Rhf8 digs a couple of Rf1+ pitfalls for White to fall into.

However given the preceding play there is nothing there to hint that may happen and 22.Qg6 with hits on f7 and c6 looks like a player whi is in tune. (but you never know till you try.)

Think 22...Rhf8 23.Qd6+ first to see where the King goes (a8 or a7) and pick it up from there. Want Qd6+ to get away from Ne7 which hits the Queen on g6 and unleashes the b7 Bishop setting more traps and moves the piece under attack.

Also playing on for a few more moves just to see if White has not slipped into 1-0 careless mode takes the game over 25 moves and does not make the miniature books.


Premium Chessgames Member
  Breunor: After 22 Rhf8:

1) +5.36 (23 ply) 23.Qd6+ Ka7 24.Nxb5+ axb5 25.Bxc6 Rc8 26.Bxb7 Rxb7 27.a4 b4 28.Rg1 Rxc2 29.Rg6 h5 30.a5 Rc1+ 31.Kg2 Rc2+ 32.Kh3 Rc8 33.b3 Bf8 34.Qxe5 Rc3 35.Qf6 Be7 36.Qxd4+ Bc5 37.Qd5 Rc7 38.Qe6 Rxd3+ 39.Kh4 Rd4+ 40.Kg5

Jun-12-19  R4f43l L3 M4550n: Difficult for easy / medium Wednesday. I'm glad I solved this even having spent about 10 minutes. The position misguids a little.
Jun-13-19  Sally Simpson: ***

Thank you Breunor,

Glad the computer likes my 23.Qd6+ (I saw it first) though it plays it for a different reason.

It played it after a 23 ply search and determined it the best move.

I chose it primarily because I could see a human blunder coming (and I noticed the pseudo-sac 24.Nxb5+ if Ka7 but no further, nor did I look at 23...Ka8. Possibly the same move 24.Nxb5.)

There is a common fault less experienced player do hidden in there.

They would look at 23. Qd6+ (it's not that hard to see.) and decide that is what they are going to play. Then spend 10-15 minutes analysing both Ka7 and Ka8.

As I said earlier Just play Qd6+ and pick it up from there. Let your opponent waste his time analysing where best to place their King.


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