april 2 2013

There are still so many listeners at this first spring session.
The Master has suffered from the unfair competition from Paris and Barcelona, but no matter! The hard core is still there to provide contradiction and propose variations from their fertile imagination.

To begin with, the resolution of the exercise from the previous session

1 - exercise from previous lesson: white to play and win
W : Rh5 Te5 Fh6 Pf5a4
B : Rd8 Pd7h7ç4f2
+ (5+5)
the beginning is obvious :
1 Bg5+ Kc7 (of course, not 1 ... Kc8 2 Rc5+ and Rb5+) 2 Rc5+ Kd6
and then, the ultimate move : 3 Bh6!
3 ... Ke7 (only move) 4 f6+ Ke6 (4 ... Kxf6 5 Bg7+) 5 Rf5 !!

Homework for the next session

2 - homework 1: white to play and win
W : Kç8 Rb3
B : Ka8 Ba4 Nç7
+ (2+3)

The 5# helpmate has a particularity: it has 3 solutions, of which I only found 2. So what? It just proves that I am weak. Sure, but the computer (in this case Fritz's special problem engine) only finds... the same two, and also skips over the one I missed. I guess the sailor ("popeye") does better, but he doesn't live in my house.

I add a 3# helpmate with a twin, composed in memory of N. Macleod. Comment from Judge H. Gruber: "While I was solving it (I won't tell you how long it took me), I imagined Norman sitting at the table, enjoying my difficulties".
Fabel 2MurkischThen a charming 45 year old serial helpmmate from the masquerade of a certain May. Black plays 22 moves in a row (without checking or putting himself in check) then White checkmates in 1. Rest with an octogenarian 3# and 4#. Then with two more 4# fifties. The first one was solved and appreciated by your master-bidon when he was 16; it was published as an original, and then awarded, in a French magazine that was not yet the conglomerate of morons it has become. Finally, we present two recent 9# by a remarkable German composer, omitting to remove the solutions. 
As a warm-up, a little joke to stop a threatening pawn.       
The regulars of the course are now used to imperceptible modifications, whose usefulness is understood 10 or 15 moves later. Here the theme is doubled. The diagram looks like a Rook endgame played on Saturday afternoon in a provincial circle. But hang on, the 2nd move is already difficult (a question of "juste milieu"), although the serious stuff starts at the 7th. The study was awarded the Kopnine Memorial, named after a composer who made analyses with the precision and depth of a computer... before it existed.
Note that I had forgotten, in response to a suggestion from many listeners, that Ka8 and Qc8 do not win against Kg2, Pg3 & h4. However, this theme is found in exercise 350 of a well-known (or little-known) work and in a famous study by Elkies 1989.
Petrossian gligoric  
An impressive attack by a recently passed away great player, against the best defender in the world. The whole thing holds up 40 years later, against the merciless engines of analysis. With one or two artistic studies included. 
See you, railwaymen and God willing, in three weeks' time, on Tuesday 23 April. 
Have a good time. 

This position has been computer-generated.
One can note the spiritual variation 1 Ra3 Nb5!

3 - homework n°2: white to play and draw
W : Kd8 Rb6 Nb1
B : Ka2 Qç5
= (3+2)

And to conclude the study part, a fantastic composition

4 - White to play and win
W : Ké6 Pa6b4ç4h3
B : Ké4 Rg5 Ph7ç5h5
on 1 a7, 1 ... Rg6+ and Ra6 immediately quiet
Investigate this problem, you won't waste your time

5 - game of the day Petrosian - Gligoric 1970
1 c4 g6 2 Nf3 Bg7 3 d4 Nf6 4 Nc3 0-0 5 e4 d6 6 Be2 e5 7 0-0 Nc6 8 d5 Ne7 9 b4 Nh5 10 Nd2 !?
One also plays g3 or Re1 to counteract Nf4
10 … Nf4 11 a4
With idea Ba3 followed by c5
11 … f5 12 Bf3 g5 !
12 … Nd3 13 Ba3
13 ef Nxf5 14 g3
14 Nde4 Nh4
14 … Nd4 !
But 14 … Nh3+ 15 Kg2 Qd7 ! also works
15 gf
Petrosian accepts the gift 15 Bg4 Bxg4 16 Qxg4 h5 17 Qd1 Nh3+ 18 Kg2 g4 19 f3 Qd7
15 … Nxf3+ 16 Qxf3 g4 17 Qh1 ef 18 Bb2 Bf5 19 Rfe1 f3 20 Nde4 Qh4 21 h3 ? Be5 ! 22 Re3
22 hg ? Qxg4+ 23 Kf1 Bxc3
22 … gh 23 Qxf3 Bg4 ! 24 Qh1
Switchback !!
24 … h2+ 25 Kg2
25 Kf1 Rf3
25 ... Qh5 ! 26 Nd2
switchback !! 26 Ng3 is not recommended
26 … Bd4 ! 27 Qe1
The threat was Rxf2
27 … Rae8 28 Nce4 Bxb2 29 Rg3 Be5 30 Raa3 Kh8 31 Kh1 Rg8 32 Qf1 Bxg3 33 Rxg3 ? Rxe4

Of course, in the electronic version of the Master you will find many more variations, and correct ones at that!

The restoration started with Roses

6 - serial helpmate 3 moves with Roses
Gerard SMITS
The Problemist 2009
W : Ka2 Pf4f3h2 ROd4é1
B : Kh4 Qb4 Rh5g2 Bf5 Ph7é6h6a5ç5a4h3ç2 ROb5
sh‡3 (6+14) C+
RO=Rose : Extended but rounded knight
To help you a bit, Rg2 is pinned by ROe1 and the Bf5 by ROd4 and more complicated, if you remove pc2 and Qb4, Kh4 is in check by ROe1
All this will help in the resolution but there are more things to see, of course

And as it was late, the Nightrider arrived before the Master took the Noctambus
7 - hs#2,5 Take&Make - Anti-Andernach with Nightrider e3
1st Prize
W : Ké5 Qf8 Ra8 Na5é4 Pg6b4
B : Kd7 Rd4h4 Bd3 Pç7é6h6 Noé3
hs‡2,5 (7+8)
Take & Make : a capture is followed by a movement of the capturing piece with the characteristics of the captured piece
Anti-Andernach : if a piece plays without capturing, it changes colour
N=Nightrider : Extended knight: Noe3 can go to c2, a1, f5 g7, c4, a5 and d5

It's Petkov, so it's top class.
For some time now, he has been moving towards enchantment, to our great pleasure.
A very beautiful problem

The next session, which I hope will be a little more crowded, will be held on 23 April.

Good reading to all

Sincerely yours

Le greffier


spring peeling

The first diagram is correct, but strangely the FEN is wrong. Here it is in English notation, apparently the one that works to display the diagram directly under "chess bouse" (it may be different for other diagram editors):
The first move of the day's game is 1 c4.
On 15 Bg4 Bxg4 16 Qxg4 it turns out, and the large audience agreed, that 16...Nde2+! is stronger.
Let us note as possible saves 21 Ng3 and 22 Nd1.
Nice remark about the noctambus.
Have a good time.

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