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James P Jackson vs David Okike
London Chess Classic Open (2014), London ENG, rd 7, Dec-13
Sicilian Defense: Classical Variation. General (B56)  ·  0-1

8
7
6
5
4
3
2
a
1
b
c
d
e
f
g
h
White to move.
ANALYSIS [x]
0-1

rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1
FEN COPIED

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Kibitzer's Corner
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Mar-08-16
Premium Chessgames Member
  Penguincw: Tuesday puzzle, and it looks like a Monday puzzle: queen sac followed by mate.

It even follows a Monday thought process. Black threatens mate on a4, but the d1 bishop is guarding that square. The queen can capture the d1 bishop. What to do...

Mar-08-16
Premium Chessgames Member
  Phony Benoni: It's National Cleric Day! Have a bishop for lunch!
Mar-08-16  dfcx: Black would like to play Rxa4# except the white bishop is guarding the pawn. Now it's easy to see 36...Qxd1 wins the bishop

37.Rxd1? Rxa4#

Mar-08-16
Premium Chessgames Member
  tpstar: Okike Dokike
Mar-08-16  stst: The White K has only sq. to move, one already guarded by Black's B, so RxP+ would do? But, the P is guarded by White's B, so the only way to dis-allow this is the destroy this B, hence:

36..............QxB
37.RxQ (other moves? then QxP#) RxP#

looks like simpler than Monday's

Mar-08-16  Cheapo by the Dozen: "Who will rid me of this troublesome bishop?"
Mar-08-16  alfiere nero: Okay, I got this one. But I thought that White's response would be P-B3, and Black would then play QxP, threatening RxP+ next.
Mar-08-16  saturn2: QxB and if white plays
a. QxB he looses also the rook
b. RxQ he looses the game at once

Writing the above lines took me twice as long as seeing the solution.

Mar-08-16  M.Hassan: Black is a pawn down.

36..........Qxd1
<if 37.Rxd1 Rxa4#>

37.Qxe4 Qxc1+
38.Qb1 Rxa4#

Mar-08-16  ndg2: Most tenacious sequence would be 36...Qxd1 37. Qxe4 Qxc1+ 38. Ka2 fxe4 39. b3 Rc7 40. b4 Rc2+ 41. Kb3 Qb2#
Mar-08-16  stacase: <Cheapo by the Dozen: "Who will rid me ...">

First chuckle of the day.

Took me longer than it should to see that Queenie had a job to do.

Mar-08-16  agb2002: Black is one pawn down.

The white bishop stops 36... Rxa4#. Therefore, 36... Qxd1, winning far more than just a piece:

A) 37.Rxd1 Rxa4#.

B) 37.b3 Rxa4+ 38.bxa4 (38.Kb2 Qe2+ 39.Kc3 b4+ 40.Kd4 Qd3+ 41.Kc5 Qd5+ 42.Kb6 Qa5#) 38... Qxa4+ 39.Kb2 Qb4+ 40.Ka2 (40.Ka1 Qa3#) 40... Bd5+ 41.Ka1 Qa3+ 42.Kb1 Qa2#.

Mar-08-16  morfishine: <36...Qxd1> embarrasses White as there is no reply
Mar-08-16  gofer: The POTD today is a simple "remove the defender".

<36 ... Qxd1>

But that left me wondering... ...how far back was white sunk?!

What is the best defence after <35 ... Qd5>? Is there a defence?


click for larger view

Well rather obviously 36 a4 isn't an option and neither is 36 b3 or 36 b4 or 36 Bb3

36 b3 Qd4+
37 Rc3 Qxc3#

36 b4 Qa2#

36 Bb3 Qxb3
37 a3 Rxa3+
38 bxa3 Qxa3#

But what about 36 a3?

<36 a3 b4>

37 a4 b3 mating

<37 Bc2 bxa3>
<38 Bxe4 axb2+>
<39 Kxb2 ...>


click for larger view

Now, this is far more interesting...

<What is the quickest win/mate?>

Our silicon buddies will work this out in milliseconds, but what about humanity?! No cheating now... ...what is quickest?!

Mar-08-16  Cybe: 36. a3 - and strong russian engines are giving draw: 36... b4, 37. Qh6!
Mar-08-16  CHESSTTCAMPS: White is up a pawn, but the king is exposed on the semi-open a-file and white's queen and bishop are passively placed. If black removes the defender of a4, it's over:

36... Qxd1!

A.37.Rxd1 Rxa4#
B.37.Qxe4 Qxc1+ 38.Ka2 (Qb1 Rxa4#) fxe4 mates in two more moves. C.37.b3 Qxb3 mates soon.

Mar-08-16  cocker: 36 a4 looks a bit rash.
Mar-08-16  Oxspawn: Black needs the white bishop to go away. In the absense of the white bishop, black does not need the queen. The rook and the bishop can handle it. Therefore

36. Qxd1
and I would imagine that white surrenders.

Mar-08-16  Oxspawn: James P Jackson is a great name. Sounds like it should give you some advantage in the opening especially if you wear a stetson and gun belt. But he's British, I think and he certainly took a cereal kiking here (weak pun sponsored by Wikipedia).
Mar-08-16  schachfuchs: @gofer: I got 39...Ra2+ and 40...Ra3+
but that took me a minute instead of seconds for today's puzzle ;-)
Mar-08-16  whiteshark: Todays goal: <attentiveness> - black to move! ;)

Solution is quite simple...

Mar-08-16  WorstPlayerEver: At live food flicks centre vote again am route won land job civil queen's am fake pin as hi hints well centre vote again am i b1 live hints call i flag as cover akin an glad drive rove drawns float mad as an i d1 dip an a4 ever am good beef as a4 hup home hop low ave learn as now etc ect, I suppose.
Mar-08-16  mrknightly: <Cheapo by the Dozen> Great and appropriate quote. I laughed out loud!
Mar-08-16  zb2cr: White's Bishop prevents Black from mating via ... Rxa4#. Solution: Remove the Bishop. 36. ... Qxd1. Now the Queen as well is threatening the White Pawn at a4. White has nothing better than 37. Rxd1, Rxa4#.
Mar-08-16
Premium Chessgames Member
  PawnSac: < cocker: 36 a4 looks a bit rash. >

yea pretty dopey move. As Cybe pointed out, a3 is more sensible.

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