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Eugenio Torre vs John van der Wiel
SWIFT Blitz (1987) (blitz), Brussels BEL, Apr-26
Indian Game: Kingside Fianchetto (A48)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
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Nov-11-19  saturn2: I saw both

54. Rd6+ Kh7 55. Qg8# and

54 Qf8+ Kh7 55. Rd7+ Bg7 56. Qxg7#

Nov-11-19  lost in space: Saw 54. Rd6+ with Qh8# to follow
Nov-11-19
Premium Chessgames Member
  agb2002: White has a rook for a bishop.

White can deliver mate in four with the simple 54.Qf8+ Kh7 55.Rd7+, etc.

One move quicker is 54.Rd6+ Bxd6 55.Qf6+ and mate next.

Nov-11-19
Premium Chessgames Member
  agb2002: Actually, 54.Rd6+ Bxd6 is two moves quicker than 54.Qf8+ but Black had 54... Qg6.
Nov-11-19  Walter Glattke: 54.Rd6+ Kh7 55.Qg8#
Nov-11-19  smitha1: AFter 54 Rd6, does Black not have the option of 54... Qg6 55 R(either) x g6 Kh5, churlishly delaying mate for several moves?
Nov-11-19  AlicesKnight: 54.Rd6+ and neither the capture nor the moves prevent mate.
Nov-11-19  stacase: Why not 54.Qh8# Oh Black has a Bishop on the job. What to do, what to do? Oh look at that 54.Rd6+ and Black can take the Rook or 54...Kh7. Either way White says mate on move 55.
Nov-11-19  Lambda: There's no prize in chess for mating in fewer moves.

(And it's not mate in two, black can play 54...Qg6. We don't bother considering this move because there's no prize in chess for mating in fewer moves.)

Nov-11-19  malt: A toss up between 54.Qf8+ and 54.Rd6+
Nov-11-19  laskereshevsky: 54.♖d6+ deflection ...♗xd6 55.♕h8#

…It's just another manic Monday

Nov-11-19  sophiephilo: Yeah, saw the first move but followed it by Qxd6
Nov-11-19
Premium Chessgames Member
  Inedit2: Nice !
Nov-11-19  nr77man: 54. Rd6+ is obvious destraction.

also possible on 50th move
50. Rc6+ Q×c6 51. Qc6+ kh7 52. Qg6+ Kh8 53. Qh6#

Nov-11-19  TheaN: After <54.Rd6+> White mates quickly, despite reply: <54....Qg6 (Bxd6/Bf6 55.Qh8#) 55.Rdxg6+> with <56.Qh4#>. Of course alternatives work, initially I wanted to play 55.Qxf6+ after 54....Bf6, but the pin allows White to win immediately. It's done soon, hence van der Wiel allowed 54....Bxd6 55.Qh8#.
Nov-11-19  saturn2: 19. Ncxe5 could have won at least a pawn, no?

19...Bxe4 20. Nxg6 Bxc2 21. Nxe7+ Rxe7 22. Bxb5

19...Nxe5 20. Bxe5 Nxe4 21. Bxg7 Kxg7

19...Nxe4 20. Nxc6

Nov-11-19  TheaN: <Lambda: There's no prize in chess for mating in fewer moves.>

No, though there's a nuance here.

Currently almost everyone plays with increment, both in normal games (10/sec or 30/sec a move) as well as rapid (15/5) or blitz (3/2). With increment, I'd say mate in two or three rarely matters.

Without however, finding that pattern that allows mate in as few moves as possible regardless of reply could be difference in flagging or not. It's incredibly unlikely, but especially in bullet (1/0) or 'regular' blitz (3/0) these occurrences happen.

Nov-11-19
Premium Chessgames Member
  FSR: Very easy even for a Monday. Both checks that don't hang material (54.Qf8+ and <al wazir>'s 54.Qb6+), and one check that does (54.Rd6+), force mate.
Nov-11-19  zb2cr: 54. Rd6+ gives Black 3 choices:

A. 54. ... Bxd6; 55. Qh8#.

B. 54. ... Kh7; 55. Qg8#.

C. 54. ... Qg6; 55. R(either)xg6+, which then gives Black the choice of two ways to be checkmated: C.1. 55. ... Kh7; 56. Qg8#.

C.2. 55. ... Kh5; 56. Qh5#.

Nov-11-19
Premium Chessgames Member
  Louben: Nice is 54.Rd6+;Bf6;55.Qh8#
Nov-11-19  DrGridlock: <With increment, I'd say mate in two or three rarely matters. Without however, finding that pattern that allows mate in as few moves as possible regardless of reply could be difference in flagging or not. It's incredibly unlikely, but especially in bullet (1/0) or 'regular' blitz (3/0) these occurrences happen.>

I understand your point, but if you're under >that< much time pressure, it's almost always better to play the mate in 3 line directly, rather than spend extra time thinking to find the mate in 2 line.

Nov-11-19  Damenlaeuferbauer: With his flag about to fall, my old Philippine friend Eugenio fortunately found the mate in 3 moves with 54.Rd6+!,Qg6 (54.-,Bxd6 55.Qh8#, 54.-,Kh7 55.Qg8#) 55.Rdxg6+,Kh5/Kh7 56.Qh4#.
Nov-11-19  RandomVisitor: After 46.Qc5 black can exchange rooks and aim for a draw:


click for larger view

Stockfish_19100908_x64_modern:

50/20 02:01 257,367k 2,122k 0.00 46. ... Rxg1+ 47.Qxg1 Bxb4 48.Qb1+ Kh6 49.Qc1+ Kh7

Nov-11-19  RandomVisitor: After 35.Be2 black's pieces are coordinated and white can only hope to defend against threats


click for larger view

Stockfish_19100908_x64_modern:

<42/67 06:09 3,135,328k 8,479k -1.06 35...Bb7> 36.Bf1 Rd6 37.Be2 Kg7 38.Rf1 Qe4 39.Bxf4 Rxf4 40.Rxd6 cxd6 41.Rd1 Be7 42.Bd3 Qd5 43.Be2 Qa2 44.Qg3+ Kf8 45.Qf2 Qc2 46.g3 Re4 47.Nd2 Rxe2 48.Qxe2 Qxc3 49.Ne4 Qxb4 50.Qh5 Ke8 51.Qh8+ Kd7 52.Nf6+ Bxf6 53.Qxf6 Qc5+ 54.Qf2 Ke6 55.Qxc5 dxc5 56.Kf2 b4 57.Rd8 Bc6 58.Ke3 c4 59.Rb8 Bb5 60.Rxb5 axb5 61.a6 b3 62.Kd2 e4 63.a7 e3+ 64.Kxe3 b2 65.a8Q b1Q 66.Qe8+ Kd6 67.Qxf7 Qe1+ 68.Kd4

Nov-12-19  patzer2: My first and only candidate move for yesterday's Monday (54. ?) puzzle was 54 Qf8+ which forces mate-in-four.

Didn't bother looking for the better alternative 54. Rd6+ which forces mate in two or three.

P.S.: Black's decisive mistake appears to be the tempting Bishop fork 46...Bd4?, allowing 47. Qc2+! Rd3 48. Qc8 +- (+5.43 @ 36 ply, Stockfish 10).

Instead, 46...Rxg1+ 47. Qxg1 Bxb4 48. Qb1+ Kh6 ⩲ to = (+0.33 @ 50 ply, Stockifsh 10) gives Black excellent drawing chances, as 49. Qxb4? Qf1+ 50. Rg1 Qf3+ = yields a draw by perpetual check.

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