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Lajos Portisch vs Mato Damjanovic
Monte Carlo (1968), Monte Carlo MNC, rd 6, Apr-08
Benoni Defense: Czech Benoni Defense (A56)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
Nov-13-17  lost in space: Even too easy for a Monday.

40. Rxg8+ Kxg8
(else, e.g. after 40...Kf7: Queen is lost)

41. Qh8+ and the queen on a8 is gone

Nov-13-17
Premium Chessgames Member
  patzer2: Today's Monday puzzle (40. ?) solution is the easy skewer tactic 40. Rxg8+ Kxg8 41. Qh8+ Kf7 42. Qxa8 +-.

For a Black improvement, I'd ditch the whole idea of pitching a pawn in the opening with 6...b5?! 7. cxb5 ±. Instead, if you must give up a pawn here, play the Benko Gambit with 3...b5 4. cxb5 a6 when Black gets more play for the gambit pawn.

Nov-13-17
Premium Chessgames Member
  al wazir: 37...f6 was black's only defense. If 38. f3 or 38...Qh7, then 38...Qd5. If 38. Qc4, then 38...d5.
Nov-13-17
Premium Chessgames Member
  patzer2: White lets Black back in the game with the overly timid 22. b3? allowing 22...Ne8 = (0.02 @ 32 ply, Stockfish 8).

Instead, the bold 22.Qxc7 Rxb2+ 23.Kd3 Nxf1 24.Qxe7 h6 25.Qe8+ Kh7 26.Qxf7 +- (+3.61 @ 29 ply, Stockfish 8) is immediately winning.

Nov-13-17
Premium Chessgames Member
  patzer2: After holding on for quite a while after 22...Ne8 =, Black slips up with 34...Nxd5? allowing 35. Rxh7 ±.

Instead, simply 34...Bd8 = or 34...h6 = holds it about level.

Black's final decisive mistake was 35...Nf6? allowing 36. Rh8+ Ng8 37. Qc2! +- (+3.03 @ 27 ply, Stockfish 8). Necessary instead was 35...Bd8 36. Ke2 Ke7 37. Rd1 Qxa2 38. Qxa2 Nc3+ 39. Kf3 Nxa2 40. Ra1 Nb4 41. Rxg7 Ke6 ± (+0.53 @ 32 ply, Stockfish 8) with drawing chances.

Nov-13-17  ThumbTack: 35... Bd8 would have saved the game, but after 35...Nf6, Black is in bad shape.
Nov-13-17  stacase: <lost in space: Even too easy for a Monday. >

Yep

Nov-13-17
Premium Chessgames Member
  Check It Out: Let’s not forget that there are beginners who would consider this puzzle complicated.
Nov-13-17  alphee: Those monday puzzle make you feel great, unfortunately, it doesn't last very long: friday ones bring you back to earth....
Nov-13-17  saturn2: After I realized there is no mate I went for winning the queen.
Nov-13-17  leRevenant: <lost in space: Even too easy for a Monday. > Nope, nothing is too easy for Monday.
Nov-13-17  morfishine: No Mato for Mato, but his Queen is lost after <40.Rxg8+> followed by <41.Qh8+>

*****

Nov-13-17  malt: Same as <lost in space>
Nov-13-17  Cheapo by the Dozen: The obvious try for a mating attack fails as a mating attack -- but it wins massive material as a very nice consolation.
Nov-13-17
Premium Chessgames Member
  Oxspawn: <malt>, <lost in space> ... yes you already know the ending but think how much pleasure you get in playing through the game and seeing how black achieves his doom. Like a movie which tells you the story in a flashback; finally you arrive at the tragic point where you began...
Nov-13-17  zb2cr: 40. Rxg8+ begins a sequence which causes the loose Black Queen on a8 to be lost. Either Black's King steps aside at once (40. ...Kf7; 41. Rxa8) or he is forced to do so (40. ... Kxg8; 41. Qh8+, Kf7; 42. Qxa8).
Nov-13-17  malt: <Oxspawn> I'll give a stab 42...Ke6
(42...ef3 43.Qd5+ Ke8 44.Qe6 Kd8 45.Rh8+ Kc7 46.Qc8+ Kb6 47.Qd7) 43.Rh5 ef3 44.B:c5! R:g4 45.Qd5+ Kd7
45.Qf5+ Kc7 46.Q:g4 dc6 47.Q:g7 Kd6
48.Qf7
Nov-13-17
Premium Chessgames Member
  patzer2: After 38...Rb4?, the move that sets up today's easy Monday puzzle combination is 39. Qh2! +- (mate-in-13, Stockfish 8 @ 32 ply).

If instead of 38...Rb4? Black plays 38...Bh6 (diagram below), finding a strong winning line gets quite a bit more complicated.


click for larger view

After 38...Bh6 (diagram above), Stockfish 8 gives the strongest winning line as 39.g5 Ba1 40.Bf4 +- (+2.68 @ 33 ply) when play might continue 40...Ke7 41.fxe4 Kd7 42.Kd1 Qa6 43.Qe2 Qxe2+ 44.Kxe2 Bd4 45.Kd3 g6 46.R8h7 Ke6 47.Rf1 Rf8 48.Bd2 Ne7 49.Bc3 Nc6 50.Bxd4 Nxd4 51.Rf6+ Ke7 52.Rxg6 Ne6 53.Rgh6 Nxg5 54.Rh8 Rxh8 55.Rxh8 Nf3 56.a4 Ne5+ 57.Kc3 Nc6 58.Rh1 Ke6 59.Rf1 Nd4 +- (+15.98 @ 30 ply).

Nov-13-17
Premium Chessgames Member
  kevin86: White dominates the h file with the three major, then firces his way to a8 and the adverse queen.
Nov-13-17
Premium Chessgames Member
  ChessCoachClark: Excellent game for showing the Battering Ram and (Royal) Skewer tactics to students.
Nov-13-17  Bubo bubo: 40.Rxg8+ lures the black king into a skewer: 40...Kxg8 41.Qh8+ Kf7 42.Qxa8
Nov-13-17
Premium Chessgames Member
  patzer2: <ChessCoachClark> Good point about 39. Qh2! +- being an instructive "Battering Ram and (Royal) Skewer" tactic.

However, it's not something your students can put on automatic pilot and expect to work every time.

For example after 38...Bf6, the attempt 39. Qh2? allows 39...Ke7 ⩲ (best is 39. g5! +-) when Black is back in the game with a fighting chance.

Nov-13-17  Nullifidian: 40. ♖xg8+ ♔xg8 (♔f7 41 ♖xa8) 41 ♕h8+ ♔f7 42. ♕xa8
Nov-13-17  stst: MOndy R-sac:
40.RxN+ KxR (else ...Kf7, 41.RxQ)
41.Qh8+ Kf7
42.QxQ and this's about it, no need to continue.

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