[blind-chess] Spoiler Alert Problem WAC036
- From: "Paul Benson" <paul.benson@xxxxxxxxxxxxxxx>
- To: <blind-chess@xxxxxxxxxxxxx>
- Date: Sat, 25 Sep 2010 06:40:47 +0100
Hello all,
.
This posting is divided into various parts. You can jump to the headings of the
sections by search/find for **, a pair of asterisks
.
** Positional evaluation of the problem
.
White is a pawn up, though that extra pawn is isolated and can be captured with
check. White has a long-term possibility of creating an outside passed pawn, by
advancing the a-pawn twice. The location of a pawn on f3 instead of f2 creates
both positional gains and losses. The gains are that the king is not in danger
of a back rank mate, and when the endgame arises, he has a quick route to the
centre. The losses are, diminished protection from attack by the black queen,
and should a black rook land on the white 2nd rank, the king loses the chance
to advance toward the centre. The queen is active on c6 and is supported by a
rook. The a1 rook is protecting the backward a3 pawn and offers support to any
advance to create a passed pawn
.
Black has a backward pawn on the c-file which needs defending by the heavy
pieces. The kingside pawns have started advancing, but still offer shelter if
needed for the king. The heavy pieces, while being tied down to defending c7,
have potential to become active very quickly. The white d4 pawn can be taken
with check, and e2 is a potential invasion square for a rook
** Hints section, 5 hints
.
** Hint 1, to find the key move
.
Ignore the small fry
.
** Hint 2, to find the key move
.
Imagine one of the white pieces did not exist
.
** Hint 3, to find the key move
.
It exists, so try to deflect it from it's post
.
** hint 4, to find the key move
.
It will resist deflection, but can be dragged away
.
** 5th and final hint, to find the key move
.
White has rooks doubled on the back rank, so nothing can happen there, right?
.
** Proposed solution to WAC036
.
The first tactical mechanism to be employed is an attempted deflection, with 1.
... Re1+, taking advantage of the c1 rook being tied down to protecting the
queen. So, 2. Kf2 is forced. Now black can employ a second tactical mechanism,
the x-ray attack on the a1 rook. After 2. ... Qxc6, white has 2 losing
continuations
.
Firstly, 3. Rxc6 Rxa1 4. Rxc7+ Ke6 5. Rc6+ Rd6 and white will be a rook down
for a pawn
.
Secondly, 3. Kxe1 Qd6 and white has rook and pawn against the queen, there are
no tricks, this is won for black but will take a little time
.
** Condensed proposed solution
.
1. ... Re1+ 2. Kf2 Qxc6 3. Kxe1 Qd6
.
** Other tactical variations considered, and rejected
.
There are 2 capturing moves, both give away winning prospects. If 1. ... Qxd4+
2. Kh1 and this looks balance, most likely a quick draw
.
If 1. Qxc6 2. Rxc6 Rxd4 3. Rac1, and it appears black has some problems. If 3.
... Rdd7 white pushes the a-pawn to create a passed pawn, the only way to stop
that pawn, is to remove one of the rook defenders of the c7 pawn, and lose that
pawn. There is 3. ... Rd3, but 4. Rxc7 Rxa3 5. Rxe7+ Kxe7
6. Rc6 Ra6 7. b5 Ra2 8. Rxb6 Rb2, and I think black has insufficient for a draw
.
** Alarm bells
.
1. The white rooks were set up for queenside play, when king safety should have
been considered first
.
The black rook on e7 was effectively tied down to defending the c7 pawn, only
that was clearly an illusion
.
3. Positional judgement would have said the white first rank was secure,
tactics said otherwise. Positional judgement alone is not enough, one has to
consider tactics at every twist and turn
.
Paul Benson.
-----Original Message-----
From: R Dinger - Email Address: rrdinger@xxxxxxxxxx
Sent On: 23/09/2010 16:06
Sent To: chess - Email Address: blind-chess@xxxxxxxxxxxxx
Subject: [blind-chess] Problem WAC036
Good Morning Puzzlers,
This problem is from Mario Lang's puzzle web page at
http://delysid.org/chess/epd.cgi
and is reported to be from Fred Reinfield's book "Win At Chess" 1958.
Problem WAC036
Black to move
FEN Problem Setup:
3r4/
2p1rk2/
1pQq1pp1/
7p/
1P1P4/
P4P2/
6PP/
R1R3K1
b - - 0 1
Short Algebraic Problem Setup:
White: Kg1, Qc6, Ra1, Rc1, Pa3, Pb4, Pd4, Pf3, Pg2, Ph2
Black: Kf7, Qd6, Rd8, Re7, Pb6, Pc7, Pf6, Pg6, Ph5
Other related posts:
