Thursday, November 23, 2017

Part №31. Let's stir a brain crinkle?!

Happy time of the day, dear fans of chess adventures!
Today we give start to the next - the 5th Chess Marathon. As we have already informed in the previous releases, there will be published 20 tasks on our site at once. The time for the solution of the tasks is 45 days.
So, we start our representation of chess "nutlets". The tasks from №1 up to №8 are prepared for you by the international master from Poltava Vladimir Pogorelov. The tasks from №9 up to №20 – by the heading leader of our chess marathon.


In the tasks №1, №2, №3 and №4 it is necessary to mate the Black King in two moves. But before this exploit you,dear marathon-racers, have to remove one White figure from the board.

№1
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#2


№2
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#2


№3
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#2


№4
2012.10.01_4
#2


In tasks №5, №6, №7 and №8 a mate is already given to the Black King in three moves. But before afflicting the Black leader, it is necessary  to remove one White figure from the board too.

№5
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#3


№6
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#3


№7
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#3


№8.
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#3


To win a duel on the diagramme №9 is not possible even for the mighty computer. But if to add two Black figures in the position  – a prize of the White is possible.  But that’s not all! In the position with two Black figures rearrange a White Elephant in the field a55 and specify one more way to the victory.

№9
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Prize


Find on the diagramme №10 №10 a field for a Black Pawn and win a duel.

№10
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Prize


By mistake of a type-setter in the position №11there are no Kings. It is known only that the Black King is on  its Queen’s flank, and the White King is - on its Queen’s flank. Return the Kings on the board and specify the way to the victory.

Task №11
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Prize


Before finding rescue on the diagramme №12, find the point of a residence permit of the Black King!

№12.
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Drawn game


Tasks №13, №14, №15 and №16 – the questions on knowledge of chess history.

№13
Three well-known Soviet grand masters are represented on a drawing fragment. Name surnames of these chess players, and what sad event is the drawing devoted to?

2012.10.01_13


№14
This Spanish friar all life devoted to turning of "the stray souls» in Roman Catholic faith. But the international recognition to the friar brought only one "soul" … What «thin substance» is there a speech about?


№15
Wishing a person happy birthday, we usually wish him or her long years of life …
In 1872 the English magazine, which name is translated into Russian as «Birth, matrimony and death», opened a chess heading on its pages. What purely chess advice-wish was given to the readers by the staff of this specific edition?


№16.
The invention of this baron about 70 years deceived the population of Europe. It is known that even Napoleon got on its fishing - rod! Name this invention.

2012.10.01_16


In tasks №17, №18, №19 and №20 there is a small defect demanding constructive intervention (see release №30 and №31 «Recover a composition).

№17
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#2

Simultaneously with the author's 1.Qd8!! to a mate in two moves leads a rough 1.N:d1+ as well. I’m sure that you, dear marathon-racers, will turn out to find justice on this roughness!


№18
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#2

With a move under three blows 1.Bf6! the White created a threat to 2.Rd4#. Now on every possible protection of the Black bright fireworks of variants with the effect "tying togethers - untying" flash!
1...Bd5 2.Bh7#; 1...B:d7 2.Qb4#; 1...Qd6 2.Bh7#; 1...Q:d7 2.Qf5#; 1...Nd6 2.Qd4#. But after 1...Q:f6 the mate on the second move will not take place.
The replacement of one Black Pawn by two White eliminates this defect … Find this replacement!


№19
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#3

Except the author's 1.Qc6! to a mate in three moves leads 1.Qg4 as well. Except this defect in the main variant – 1...R:e5 2.Qh1! Re1 3.Qb7# – it is possible to play 2.Qb7+! R:b7 3. B:e5# too. Hardly having changed a position, it is possible not only to eliminate these flaws, but also to decorate a plan with one more ideological variant!


№20
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#3

Except the author's 1.Bh4 to a mate in three moves leads a loud victim 1.Bh3 + too! K:h3 2.Q:g5 ~ 3.Qh4# too.
And in the variant 1 … K:h4 2.Qf2 + Kg4 3.h3# to the goal was leading silent 2.Qf3! g4 3.Qf6#!
What minimum means is it possible to correct the problem with?


For the correct and full decision of the tasks №1 - №12 — 5 points are charged.
The correct and full answer to the questions №13 - №16 is estimated by 3 points.
 For correction of compositions №17 - №20 — 5 points are charged.
In case of equality of points at several participants, the winner will be defined on more successful corrections of tasks №17 - №20. If this quality indicator is identical, the winner will be defined by a lot.
For those participants who participates for the first time in the marathon, I will notice that at the decision of a two-step move it is enough to specify only the first move.
For the three-step move, except the introductory move, it is still necessary to find a threat, the moves of the Black, protecting from this threat (if the problem is on Zugzwang, all the moves are of the Black), and necessarily the second moves of the White. The mating moves are not necessarily to be shown.
Making out the decision of an etude it is enough to solve the author's plan - the main variant of the etude. I’d like to give an advice to the solvers-beginners. If you doubt what variant of an etude is the main one - give the full decision with all variants. This method is often used by skilled solvers!

And one more advice-help: in some tasks of our marathon some variants of the decision are possible. It is necessary to give all these possibilities. Be vigilant!

The closing date of sending the answers is – November, 20th.
The three of the best solvers will be awarded by diplomas of our site "Perspectiva", and the winner of the marathon will be awarded also by a book prize on history of Odessa.


For the beginners of a chess marathon we inform electronic co-ordinates where it is necessary to send the answers to the tasks: This e-mail address is being protected from spambots. You need JavaScript enabled to view it

See you on a chess page of "Perspectiva"!
Your heading leader, Honoured Chess Master of Sports of Ukraine Sergey Tkachenko.