# [blind-chess] Spoiler Alert] Problem WAC064

• From: "Paul Benson" <paul.benson@xxxxxxxxxxxxxxx>
• To: <blind-chess@xxxxxxxxxxxxx>
• Date: Sat, 23 Apr 2011 18:24:16 +0100

Hello all,
.
sections by search/find for **, a pair of asterisks
.
** Positional evaluation of the problem
.
White: Two pawn islands, and a pawn ahead. The b-pawn is a distant passed pawn,
the word, distant, is included as the black king will have to travel some
distance to halt this pawn. It is also doubly attacked by the black queen and
knight, and defended only once. The kingside pawns are comfortable. The king is
safe, the advance of the h-pawn has avoided the possibility of a back rank
mate. The queen is centrally placed, controlling the e-file and a few more
useful squares along diagonals, in both the queenside and kingside. She is also
attacked by the black knight. The knight is tied down to defending the passed
b-pawn, but could have some thoughts of some kingside attacking ideas,
depending on how black plays
.
Black: One pawn island, and a pawn down. The f6 pawn has most likely been moved
there to control e5, though it's movement has permitted the king a slightly
quicker route to the centre. The king has made an advance into the kingside. It
would have been much preferable if possible, for the king to get across to the
queenside, to assist in stopping the white b-pawn. Advancing the king when the
opposing queen is still on the board, needs careful judgement and sometimes,
lengthy calculation. The queen is going to be defending against the threat of
the white b-pawn for a long while. Similarly, the knight is going to be
involved in stopping the b-pawn, and will not have prospects of any attacking
ideas on the white king
.
** Hints section, 5 hints
.
Hint 1, to find the key move
.
The advanced black king is rather short of safe squares around him, in fact
just one flight square
.
Hint 2, to find the key move
.
.
Hint 3, to find the key move
.
Anthropomorphism would suggest the black king is about to feel thoroughly
insulted
.
Hint 4, to find the key move
.
Isn't it the job of Cheer-leaders to gee-up the attack? Get cheering!
.
Final hint, to find the key move
.
In baseball, 3 strikes and you are out. Here, is is 3 checks and the black king
is out
.
** Proposed solution to WAC064
.
The black king has wandered a good way from his safety zone., and has only one
legal move at his disposal. The white queen is preventing the black king from
moving onto the e-file, and also controls some dark squares around him. Such a
powerfully restricting piece should only move if there is an overwhelming
reason. When such pieces move, the restrictions may disappear as well. So,
white brings another unit into the attack with, 1. g4+, and the black king
reply is forced, 1. ... Kg6. It looks as if black is retreating to his deserted
safety zone, behind his pawns. Now comes a quick finish, 2. Qe8+, and the queen
is transferring herself from the centre to the kingside. Observe how the black
king is restricted by his own pawns. Black has 2 replies, 2. ... Kh6 or Kg5,
and in both cases, the white queen invades victoriously, with the assistance of
the recently-advanced g-pawn with, 3. Qh5+ mate. Note how the white knight just
sits on d3, eliminating f4 as a flight square

.
** Condensed proposed solution
.
1. g4+ Kg6 2. Qe8+ Kg5 3. Qh5+ mate
.
** Other tactical variations considered, and rejected
.
White could try for a tactic with, 1. Qf3+, and cross fingers, hoping black
will go wrong. If, 1. ... Kg6, which is not forced then, 2. Qxd5. If black does
not recapture, white has won a piece. So, 2. ... Qxd5, and the black Monarchy
has been lured into one of those unfortunate arrangements, a knight-fork apart,
and white just happens to have such a knight. So, 3. Nf4+ Kf5 4. Nxd5, a simple
white win
.
Can black defend better? Yes, after 1. Qf3+, simply 1. ... Ke6, and a powerful
follow-up for white is not obvious. White can find ways to win a black kingside
pawn, but all these will lose the important b-pawn. For instance, 2. Qe4+,
forks the h7 pawn and now, 2. ... Kf7 seems safest, keeping the potential pawn
losses on the kingside to one. Now if, 3. Qxh7 Nxb4, and white has lost serious
winning chances. However if white ignores the kingside and plays sensibly with,
3. Qc4, pinning the black knight then, 3. ... Ke8 looks best. Note that, 3. ...
Kf8 allows, 4. Qc5, forcing queens off, and I think white is winning. So, after
3. ... Ke8, there could follow 4. Qc5 again, and white is making some progress
on advancing the b-pawn. This will be a long game, with white carefully
advancing the b-pawn. White will either win a piece for the pawn on the
queenside, or at the correct moment, abandon the b-pawn and switch from the
queenside to win pawns on the kingside. There is always the possibility of
black setting up a perpetual check to be calculated at each move, if white has
b-pawn, for another advantage, at least 1, if not 2 black kingside pawns,
requires a patient approach
.
** Alarm bells
.
1. The black king has followed general principles, of advancing toward the
centre for the endgame. The key word there is, "general", and calculation shows
here is an exception
.
2. Note how the white queen initially controlled important dark squares in the
kingside, and then the g-pawn joins in with control of some light squares, to
close a mating net
.
3. The black king has advanced to be in front of his own pawns. These pawns on
this occasion, acted as a barrier to his attempted escape from the white queen
and pawn
.
4. The white queen demonstrates how to use all her powers. An advance up an
open file, is followed by a retreat down a diagonal, to catch the black king
with few options
.
Paul Benson.

-----Original Message-----
From: R Dinger - Email Address: rrdinger@xxxxxxxxxx
Sent On: 18/04/2011 15:53
Sent To: chess - Email Address: blind-chess@xxxxxxxxxxxxx
Subject: [blind-chess] Problem WAC064

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 WAC064

White to move

FEN Problem Setup:
8/
6pp/
3q1p2/
3n1k2/
1P6/
3NQ2P/
5PP1/
6K1
w - - 0 1

Short Algebraic Problem Setup:
White: Kg1, Qe3, Nd3, Pb4, Pf2, Pg2, Ph3
Black: Kf5, Qd6, Nd5, Pf6, Pg7, Ph7
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