Paul Motwani vs Petronio Roca (1986)

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Paul Motwani vs Petronio Roca
Dubai Olympiad (1986), Dubai UAE, rd 14, Dec-01
Sicilian Defense: Scheveningen Variation. Keres Attack (B81) · 1/2-1/2

ANALYSIS [x]

FEN COPIED

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< Earlier Kibitzing · PAGE 4 OF 4 · Later Kibitzing>
Apr-08-18		sudoplatov: I also saw Qc3+ and Qc7 followed by d7. I saw Re7 for the first move but that wasn't a check; then I forgot about after Qc3 so I didn't find the other trap.

Apr-08-18		WorstPlayerEver: 33. Qc3+ Kb8 34. Qc7+ Ka8 35. Re7? Was my guess too. Not bad for a minute ;)

Apr-08-18		whiteshark: I've found the right idea <<32...Qxg2 33.Qc3+ Kb8 34.Qc7+ Ka8 > only to blunder it immediately afterwards with <35.Re7??> click for larger view Black to move -5.89 (27 ply) 35...Qg1+ 36.Kb2 Qd4+ 37.Ka2 Qc4+ 38.Qxc4 bxc4 39.d7 Rd8 40.Re8 Rh8 etc D'oh! D'oh! D'oh!

Apr-08-18		Jack0909: Qc3!! What is wrong with it?

Apr-08-18		Walter Glattke: 37.Kb3 Rh3+ 38.Kc2 R1h2+ 39.Kd1 Rh1+ 40.Re1 +-

Apr-08-18		yadasampati: What is so "insane" about 33. Qc3+ ? It looks completely obvious to me, and i am definitely not an insane player :-)

Apr-08-18		WorstPlayerEver: The insanity lies in the fact how hard it is to win a winning position. I mean.. look at the guy's rating and compare it with yours ;)

Apr-08-18		malt: Started with 33.d7+?, Thought I had it with 33.Rc5+?, Kb7 34.d7 f5 35.d8/Q R:d8 36.Q:d8 Q:g5+ then tried 33.Qc3+ Kb8 34.Qc7+ Ka8 35.d7 Like Motwani, fell for the swindle.

Apr-08-18		gofer: I rejected <33 Qc3 Kb8 34 Qb8 Qc7 35 Re7> as I saw the swindle starting with <35 ... Qg1+>. But, like <Al Wazir>, I didn't see what was wrong with <33 d7+ Kd8 34 Rc5 ...>. It looks fine and really difficult to defend against... click for larger view What did I miss!? <35 ... Qf1+!!!> Drawing!!! click for larger view ~~~ Doh!!!!

Apr-08-18		Cheapo by the Dozen: I was one of those who made the 35 Re7??? error.

Apr-08-18		Cheapo by the Dozen: On the plus side, I did quickly see that a key issue was avoiding the ... Qxc2+ draw threat.

Apr-08-18		Andrew Chapman: Stockfish's second choice is Kb2 followed by a knight promotion and a small advantage. Andrew

Apr-08-18		agb2002: White has a pawn for a rook. Black threatens Qg1+ followed by Qb6. White has the queen, a rook and a pawn to attack the black king, starting with 33.Qc3+ Kb7(8) (33... Kd7(8) 34.Qc7#) 34.Qc7+ (34.Re7 Qg1+ 35.Kb2 Qb6 36.d7 Rd8 37.Re8 Rhh8) 34... Ka8 35.d7 looks winning. For example, 35... Qg1+ 36.Kb2 Qd4+ 37.Ka2 Qc4+ 38.Qxc4 bxc4 39.Re8+ wins.

Apr-08-18		FlashinthePan: <patzer2> If 37...Qxd5 instead of Qc4+ as in your analysis, 38.Qxd5 Rd8 and, after 39.Qe5+ Kg8, 40.Qe6+ Kg7, White apparently can't win, or am I missing something?

Apr-08-18		pajaste: Qc3+ and trying to avoid checkmate..

Apr-08-18		Jimfromprovidence: An interesting line and a <really good side puzzle> comes after 33 Qc3+ Kb7 34 Re7+ (a nice alternative to 34 Qc7+) 34...Ka8. click for larger view White to play and win.

Apr-08-18		Walter Glattke: agb 2002: a grandmaster possibly would play 37.-Rb8 instead 37.-Qc4+, but white could wins then by 38.Qc6+ Ka7 39.Re8 Rh8 Looks like a Fisher book, 40.d8Q Rxd8 41.Re7+ Rd7 42.Rxd7+ Qxd7 43.Qxd7+, and then a pupil still would win this.

Apr-08-18		Walter Glattke: Jimfromprovidence: 35.Qc7 is the position of whiteshark above, where black wins with 35.-Qg1+!, 35.d7 Qg5+ 36.Kb2 Qxe7 / 35.Qe3 wins by threatening Qa7# 35.-Qb7 36.Rxb7 Kxb7 37.d7 Rh1+ 38.Kb2 Rd1 39.Qe8+ Kd7 40.Qxh8 - ... I think so, but my thinking time is short, the players have several hours to think.

Apr-08-18		Jimfromprovidence: <WalterGlattke> <Jimfromprovidence: 35.Qc7 is the position of whiteshark above, where black wins with 35.-Qg1+!> No, Walter, look and try again. The white queen is on c3 not c7. And it is white to move, not black. White must not play 35 Qc7 here.

Apr-08-18		sjunto: I didn't even consider d7; I had 33. Qc3+ Kb7 or 8 34.Qc7+ Ka8 and then nothing better than d7, which means I got a Sunday puzzle, although I was sure I'd screwed up, like I ususally do by Wednesday or Thursday.

Apr-08-18		sjunto: Or when spelling usually.

Apr-09-18		agb2002: <Walter Glattke: agb 2002: a grandmaster possibly would play 37.-Rb8 instead 37.-Qc4+, but white could wins then by 38.Qc6+ Ka7 39.Re8 Rh8> Black can play 39... Rh1 to trade this rook for the d-pawn. However, 39.Re7 looks winning (39... Rb7 40.Qxb7+ Kxb7 41.d8=Q+ and mate in two).

Apr-09-18		agb2002: <Jimfromprovidence> 35.Qd4 stops Qg1+ and threatens Qa7#. The only defense is 35... Qxg5+ 36.Kb2 Qxe7 but after 37.dxe7 the e-pawn will cost a rook.

Apr-09-18		Jimfromprovidence: <agb2002> <35.Qd4 stops Qg1+ and threatens Qa7#. The only defense is 35... Qxg5+ 36.Kb2 Qxe7 but after 37.dxe7 the e-pawn will cost a rook.> Yes. Quite correct. White also has 35 Kb2 below, with the threat of 36 Qd4 or 36 Qc5, seeing 37 Qa7# click for larger view

Apr-09-18		agb2002: <Jimfromprovidence: ... White also has 35 Kb2> Most elegant. Black only seems to have 35... Rb8 to cover a7, but 36.Qd4 Rb7 37.d7 wins.

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