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Nico Zwirs vs P V Nandhidhaa
54th Groningen Open (2016), Groningen NED, rd 2, Dec-22
Sicilian Defense: French Variation. Westerinen Attack (B40)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Aug-14-17
Premium Chessgames Member
  agb2002: White has a bishop and a knight for the bishop pair.

White can deliver mate with 21.Nxf7 Bf6 (else Qg7# or Qh8# or Kxh2) 22.Rxg5+ Kxf7 (22... Bxg5 23.Qg7#) 23.Qxf6#.

Another option is 21.Rxg5+ Bxg5 22.Qxg5+ Kh7 (22... Kh8 23.Nxf7+ Kh7 24.Qg7#) 23.Nd7 and mate in two (23... Rg8 24.Qh5#).

Also winning is 21.Ng6 f6 (21... Bf6 22.Bxf6 fxg6 23.Qh8+ Kf7 24.Qg7#) 22.Qh8+ Kf7 23.Qh7#.

Other moves don't seem to be so fast.

Aug-14-17  Cybe: Comfortably choice:
21. Ng6 – mate in 3
21. N:f7+ – mate in 4
21. R:g5+ – mate in 5
21. Nd7 – mate in 5
21. Nf3 – mate in 5
and maybe some others…
Aug-14-17  paavoh: Unusually too many choices for a Monday puzzle. Took some time to decide on Ng6.
Aug-14-17
Premium Chessgames Member
  drollere: i went for Rxg5+, Bxg5; Qxg5+, Kh8; Ng6+, g6; Qh6+, Kg8; Qg7#. more mayhem.
Aug-14-17  saturn2: I took 21 Ng6. The answers f6, e5, Bf6, Qe5 and fxN only delay the inevitable.
Aug-14-17  jith1207: I like Ng6 Qe5 and Nxe7#
Aug-14-17  saturn2: The game is a nightmare for a sicilian player.
Aug-14-17  diagonalley: hard for a monday...
Aug-14-17  Monocle: Looks like there's more than one solution.

I went with 1.Rxg5+ Bxg5 2.Qxg5+ Kh7 3.Nd7, with mate after a few delaying moves. This seems to work. Saccing the rook on g5 looked like the most 'monday' solution, and I never even looked at Ng6, although it appears to be quicker.

Unusually complex for a monday.

Aug-14-17
Premium Chessgames Member
  Cheapo by the Dozen: I sit corrected.

Thanks, <lost in space>.

Aug-14-17  malt: Gone for 21.N:f7 Bf6 22.Qg6+
Aug-14-17  morfishine: <21.Rxg5+>

*****

Aug-14-17
Premium Chessgames Member
  JohnBoy: If 18...g6 does white have anything better than 19.Qe2?
Aug-14-17
Premium Chessgames Member
  JohnBoy: Yeah...

18...g6 19.Nxg6 Bxb2 20.Ne7+ cruises home.

Aug-14-17  patzer2: <agb2002><Another option is 21.Rxg5+ Bxg5 22.Qxg5+ Kh7 (22... Kh8 23.Nxf7+ Kh7 24.Qg7#) 23.Nd7 and mate in two (23... Rg8 24.Qh5#)> or mate in three after 23...f6 (diagram below)


click for larger view

24. Nxf8+ Kh8 25. Bxf6+ Qg7 26. Qxg7#.

Aug-14-17
Premium Chessgames Member
  takchess: Notes after looking at the answer.For move 21. I looked at Qh8, Nf7 and finally decided on Rg5 +. This Monday does not bode well for the rest of the week. Didn't even investigate the correct solution
Aug-14-17  patzer2: <takchess> As long as you saw the win after 21. Rxg5+ +-, give yourself credit for the Monday solution.

Masters in their games quite often find wins that are not the quickest or technically best. A win is still a win, regarless. Unless it's a puzzle solving competition (i.e. find mate-in- four etc.,) it doesn't matter.

Aug-14-17
Premium Chessgames Member
  Crowaholic: Ng6 is not mate in three because of the ..Qxh2+ zwischenzug.
Aug-14-17
Premium Chessgames Member
  DrGridlock: Rather nuanced for a Monday puzzle.

Both Rxg5 and Ng6 lead to mate (though Ng6 is the quickest mate).

I went for the Rxg5 line, but this leads to mate only after 23 Nd7. The branch I analyzed instead was 23 Ng4. This does NOT lead to mate, because black can throw a blockade on the a1-h8 diagonal with f6 and e5 (I missed this), but this line DOES lead to overwhelming material gain for white (a queen and four pawns for the exchange).

Aug-14-17
Premium Chessgames Member
  kevin86: A subtle key move by white- as subtle as a chainsaw.
Aug-14-17
Premium Chessgames Member
  DarthStapler: Doesn't Nxf7 also work?
Aug-14-17  Tiggler: According to Houdini, White has 49 legal moves and at least 16 of them are mate in 7 or less.
Aug-14-17
Premium Chessgames Member
  perfidious: <Tiggler: According to Houdini, White has 49 legal moves and at least 16 of them are mate in 7 or less.>

Embarras de richesse.

Aug-15-17
Premium Chessgames Member
  agb2002: <patzer2: <agb2002><Another option is 21.Rxg5+ Bxg5 22.Qxg5+ Kh7 (22... Kh8 23.Nxf7+ Kh7 24.Qg7#) 23.Nd7 and mate in two (23... Rg8 24.Qh5#)> or mate in three after 23...f6>

Thank you! Or mate in four after 23... Qxh2+ 24.Kxh2 f6.

I noticed this just after closing CG's page and was about to rush to the office.

That's why I often prefer "and mate soon" instead :-)

Aug-15-17
Premium Chessgames Member
  gawain: I chose 21 Ng6 which seemed most forcing and efficient and prettiest, too.
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