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Martin Wecker vs Armann Petursson
Reykjavik Open (2017), Reykjavik ISL, rd 1, Apr-19
Reti Opening: General (A09)  ·  0-1



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Kibitzer's Corner
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Premium Chessgames Member
  gawain: The immediate ...Qd1+ fails--but Black can decoy the white queen with 10...Bb4+ Yes this wins right away even if White tries 11 Bd2.
May-01-17  Walter Glattke: Theoretical C with 11.Qc3 Qd1#
Premium Chessgames Member
  Cheapo by the Dozen: Took me a few moments to see.

Still, it IS a mate in two, so I guess it's a legit Monday puzzle.

May-01-17  diagonalley: hmmmm... yes i too feel that i should have spotted it instantly, whereas it took a couple of minutes ... DOH!
May-01-17  AlicesKnight: 10.... Bb4+ allows mate on d2 (if 11.Bd2) or d1 (if 11.Qxb4). Not the best way to play a Reti.
Premium Chessgames Member
  al wazir: Somebody's rating was not an accurate reflection of his playing strength.
May-01-17  leRevenant: Martin forgot to set his alarm clock.
May-01-17  saturn2: D: 10..Bb4 11 Bd2 Bxd2
May-01-17  paavoh: Understandably, White did not want weaken his King side with 10.g4, but the option chosen was way worse.
Premium Chessgames Member
  agb2002: The material is identical.

White is about to play Nxh5.

Black can deliver with 10... Bb4+:

A) 11.Qxb4 (or Qc3) 11... Qd1#.

B) 11.Bd2 B(Q)xd2#.

May-01-17  morfishine: <10...Bb4+> is a nice deflection ending the game. 11.Qxb4 is answered by 11...Qd1# and of course if 11.Bd2, then 11...Qxd2#


May-01-17  zb2cr: The White Queen is preventing mate on d1.
Therefore, 10. ... Bb4+.

Now, if 11. Qxb4, the White Queen has been decoyed away from her guard duties, so the d1 square is open for 11. ... Qd1#.

Alternatively, if 11. Bd2, then 11. ... Qxd2#--in this scenario, the mating square has changed.

Premium Chessgames Member
  kdogphs: Deflection... checkmate... does not get much easier yes?
May-01-17  Pasker: I love Monday puzzles. Unfortunately these sort of stuff won't happen in the 1500 rating level anymore.
May-01-17  roentgenium: I think this puzzle is great for a Monday, as it offers several lessons for lower-rated players (such as myself!).

When I first looked at the position, it honestly looked fairly 'normal' to me. Where was the danger? I even wondered if it was in fact White to play and win, or if it was a spoiler! Even noticing the threat of Qd1#, it took a while before I noticed how to make the White Queen abandon its defense of that square. Thus, this is a good exercise in elementary board vision - seeing that White's King is surprisingly vulnerable to a check on the dark squares, and that mate can be delivered on d2, not just d1.

It also goes to show that we must exercise caution even though we feel we have adequate defense against a threat, and that this can happen even in the very early game. Sometimes it's better to completely remove the possibility of a threat rather than having to keep one eye on it as the game progresses, and all the more so when that threat is a mate threat.

May-01-17  NBZ: Constant vigilance! White no doubt thought he could get a slight edge by putting the bishop on the spot. Maybe he dreamt of a kingside pawn expansion after the mandatory Bg6...

Constant vigilance!

May-01-17  Iwer Sonsch: According to Stockfish, the fearless 10.g4! would have actually been the strongest move for White despite weakening the kingside.

Black's best bet would then be to exchange pieces with 10...Bd6 11.gxh5 Bxe5 12.Bg2, followed by declining the h5 pawn in favour of 12...Nfd7 for positional reasons (0.22 @depth 28, counting from 12.Bg2).

But the puzzle itself was both easy and beautiful. Good Monday puzzle.

May-01-17  Iwer Sonsch: Stockfish also sees the entire opening to favour White by about half a pawn. White's last opportunity to forcingly maintain this advantage would have been 8.Qxe3! e6 (0.42 @depth 26).

After 8. dxe3, Black could have equalized with either 8...Nfd7 (-0.02 @depth 26) or with the correct pawn sacrifice with 8...Nbd7 9.Nc6 Qc7 10.Nb4 (0.00 @depth 26). Instead, 8...e6 allows 9.f3 Bh5 10.e4 (0.32 @depth 27) - but we see what 8...e6 allowed Black in the game.

Premium Chessgames Member
  keypusher: I was trying various sacrifices on e6 and f7 and even b6, and thinking, "maybe it's not Monday today?" Then I noticed it was Black's move.
May-01-17  BOSTER: < CS Mendel>:<I thought that this puzzle looked familiar>. The finale scene during a performance The Barbes of Seville.
May-01-17  swclark25: <Iwer Sonsch> Thanks for pointing out White's better move of 8.Qxe3!

Would there also be any advantage of 8.fxe3 to White's choice of 8.dxe3?

May-01-17  Iwer Sonsch: <swclark25> 8.fxe3!? e6 weakens the kingside, and it prevents 9.f3, pushing back the bishop effectively. Stockfish rates it as -0.15 @depth 28, given that White continues neither 9.h3?! (-0.96 @depth 21) nor 9.Nxg4 Nxg4 (-0.38 @depth 28).

That being said, the sacrifice 8.f4 exd2+ 9.Bxd2 is being rated as 0.36 @depth 26. Black can either give back the material (9...Nbd7 10.Nxg4 or 10.Nxc6) or undevelop (9...Bc8). Neither 9...Be6 nor 9...Bf5 is being rated well.

Premium Chessgames Member
  al wazir: The only games Petursson has in the CG database are six from the 2017 Reykjavik Open. He drew one against a player with a rating of 1591. This is the only one he won.
May-01-17  Sniffles: This was a puzzle?
May-03-17  patzer2: Nice win by a class D player against an expert.

White's decisive mistake was 10. Nf4?? allowing 10...Bb4+ which forces a quick mate for the Monday May 1, 2017 puzzle solution.

Instead, 10. g4 Bd6 11. gxh5 Bxe5 12. Bg2 = holds it level.

Earlier, 7. h3 , 8. Qxe3 and 9. Nd4 are alternatives moves which appear to improve White's game.

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