Sunday, December 07, 2008

Greek Compositions in the World Congress 2008, Jurmala

The 51st World Congress of Chess Composition (WCCC) took place in Jurmala of Latvia, 30 August - 06 September 2008.
The Greek colors in the area of composition were represented by the composers mr Kostas Prentos from Salonica and mr Panagiotis Konidaris from Meganissi Lefkadas.



Champagne Tourney (Champagne is a beverage from France)
Judge : the French Michel Caillaud, GM in composition and GM in Solving, who has specified the following theme:

Theme : Retroanalytic problem where a piece is pinned in two different lines.
Group A : Shortest Proof Games (SPG).
Group B : Any other kind of Retro problem.
Mythical conditions are allowed (at most two in any phase of the problem).


In Group A, Second Prize was awarded to a composition by Kostas Prentos, who is champion of Greece in Solving chess problems, for a long series of years.
In Group B, a Prize was awarded to a composition by four composers, the Romanians Vlaicu Crisan and Eric Huber and Paul Raican and the Greek Kostas Prentos.


(Problem 266)
Kostas Prentos,
Second Prize, Champagne tourney group A, Jurmala 2008
Position after the 19th move of the Black. Which were the moves of the game?
SPG 19 (13 + 16)
[rsbq1bs1/1pppp1p1/6r1/6BB/P1P1Q1Pp/1S3R2/1p1p1PKP/1RSk4]

"SPG 19" means "Shortest Proof Game in 19 full moves (white and black)". We must start the chess game from the initial position of the 32 pieces and reach the position of the diagram in 19 moves.

1.Key : e4! h5
2.Be2 h4
3.Bh5 (pin line 1 : h5-f7-e8) a5
4.Qg4 a4
5.Se2 a3
6.0-0 axb2
7.a4 Rh6
8.Ra3 Rg6
9.Rf3 f5
10.d3 Kf7 (pin line 2 : f3-f5-f7)
11.Bg5 Ke6 (pin line 3 : g4-f5-e6)
12.Sd2 Ke5
13.Rb1 fxe4
14.Sc1 Kd4 (pin line 4 : g4-e4-d4)
15.c4 Kc3
16.Sdb3 exd3 (pin line 5 : f3-d3-c3)
17.Qe4 Kc2 (pin line 6 : e4-d3-c2)
18.g4 Kd1
19.Kg2 d2

Judge's comment : A record presentation of 6 different pin-lines for the thematical Pf7 cannot be ignored by the judge. The first pin shows some strategical play with unpinning; the following are of the shielding type, accompanying black king in its walk, some of them being hardly exploited (f3-f5-f7 is of little use as King has to escape g4-f5-e6 before fxe4 is played).


(Problem 267)
Vlaicu Crisan, Eric Huber, Paul Raican (Romania) & Kostas Prentos (Greece)
Prize, Champagne Tourney group B, Jurmala 2008
We retract 7 moves and then Mate in 1 move. Condition [Circe assassin].
-7 Proca Retractor, #1 Circe assassin (5 + 8)
[8/1P5k/4PP2/1r6/1p6/1S4pp/bb2K1s1/8]

Here are some needed explanations :

-n Proca Retractor : White takes back n legal moves. Black is not helping, but selects moves that will bring difficulties to the plan of the White. After the retraction of the moves, the solution proceeds forward.
This specification took its name from the composer Zeno Proca (1906-1936).
(A different type of retractor is Hoeg Retractor, where a helpful Black decides if the black move was a capture and chooses the type of the white piece that were captured. This specification took its name from the composer Dr. Niels Hοeg (1876-1951)).

Circe assassin : The captured piece appears on its square of regeneration even if the square was occupied. The piece that had occupied the rebirth square is lost. If the occupier before the capture is a King, he is in check. (See here and here for the condition Circe).

The solution starts with moves backwards :

-1.Sc5-b3 Bb1-a2+ (The Sb3, which were pinned on b3 closing the threat of Ba2, returns to c5. The Ba2, which was checking since Ba2xe6(+wPe2) assassinates the white King, returns to b1)

-2.e5-e6 Bc1-b2+ / Ba3-b2+ (The Pawn e6 returns to e5. The Bb2, checking from there since Bb2xe5(+wPe2) assassinates the white King, returns (let us say) to c1)

-3.Se6-c5 Rb6-b5+ (The Sc5, which were pinned on c5 closing the threat of Rb5, returns to e6. The Rb5, which was checking since Rb5xe5(+wPe2) assassinates the white King, returns to b6)

-4.Kf2-e2 g4-g3+ (The Ke2 returns to f2. The pawn from g3 (from where was checking) returns to g4)

-5.Sd8-e6 Rb5-b6+ (The Se6, which were pinned on e6 closing the threat of Rb6, returns to d8. The Rb6, which was checking since Rb6xf6(+wPf2) assassinates the white King, returns to b5)

-6.f5-f6 Ba2-b1+ / b2-b1=B+ (The Pawn f6 returns to f5. The Bb1, which was checking since Bb1xf5(+wPf2) assassinates the white King, could be a Pb2 promoted to Bishop on b1, but let us say that is a black Bishop which comes from a2)

-7.Sf7-d8 (The Sd8 returns to f7).

And now the solution proceeds with forward moves for [Mate in 1 move] :

1.Key : Kg3!# ([2.Kg3xh3(+bPh7)] with instant assassination of the bK)
The black King is mated! The squares h6, h8 are guarded by the wSf7 and the square g6 is observed by the wPf5. Also 1...Kg7 2.Kxg4(+bPg7) and 1...Kg8 2.KxSg2(+bSg8).

Judge's comment : Nice use of Circe Assassin condition with typical pins and mating move. White Knight is pinned on 3 different lines.



Sixth Tzuica Tourney (Tzuica is a beverage from Romania)
Judges : the Romanians Vlaicu Crisan and Eric Huber, who proposed the following theme :

Theme : Helpselfmates (hs#n) or Helpselfstalemates (hs=n) with Orthogonal / Diagonal Transformation (ODT).
All fairy conditions and pieces are allowed
.


(Problem 268)
Kostas Prentos,
Second prize, Tzuica Tourney, Jurmala 2008
Helpselfmate in 4 moves.
hs#4 2111... (6 + 7)
[b1r5/2pK3p/1p5k/2Q2P1p/2B2P2/8/4R3/8]

Notes :
Helpself - problem is a help-problem in the initial n-1 moves (Black plays first and helps), which becomes self-problem in the last move (Black is forced to play). The final goal is mate (for hs#n problems) or stalemate (for hs=n problems).
ODT : Orthogonal / Diagonal Transformation : That which happens on rows and columns, happens again on diagonals.

Key : 1.Re7! (blocks a future flight) Rh8 (prepares a Rook – Bishop battery)
2.Bg8 (covers, to allow the King to take position) Bd5
3.Ke8 Bxg8 (the battery is complete, with annihilation of the white piece)
4.Qc6+ (the Queen gives check) Be6# (the battery is activated)

Key : 1.Bb5! (blocks a future flight) Bh1 (prepares a Bishop - Rook battery)
2.Rg2 (covers, to allow the King to take position) Rg8
3.Kc6 Rxg2 (the battery is complete, with annihilation of the white piece)
4.Qf8+ (the Queen gives check) Rg7# (the battery is activated)

Judge's comment : Reciprocal black batteries obtained in a very economical setting. In each solution the white piece shielding the wK is captured by its black counterpart, creating a battery. The black battery is activated by wQ checks. Mates are model and are achieved by simple (not double) check. An amazing achievement by the Greek composer for his first helpselfmate problem!



8th Sake Tourney (Sake is a beverage from Japan)
The Japanese Sake Tourney this year is dedicated to the memory of Masazumi Hanazawa
(1944-2007), who was one of the pioneering composers in Japan.
Judge : Tadashi Wakashima from Japan, who proposed the following theme :

Theme : Fairy Helpmate#n (n <= 4). Exact Echo. Zeroposition is not allowed.

Note : Zeroposition is an initial position, from which (with small changes) twin problems are produced.


(Problem 269)
Kostas Prentos,
First Prize, Sake Tourney, Jurmala 2008
Helpmate in 3 moves. Transmuted Kings. Four solutions.
h#3, 411111, Transmuted Kings, (2 + 2)
[K3R3/8/8/8/8/2r5/8/7k]

Note : When the Transmuted Kings are threatened by a piece, they move and capture in a way similar with the movement of the threatening piece. (If the wK is threatened by a bR leaves his square moving like a wR).

Key : 1.Rc3-c1! Re8-e7 2.Rc1-a1+ Ka8-h8 3.Ra1-g1 Re7-h7#

Key : 1.Rc3-b3! Re8-h8+ 2.Kh1-a1 Rh8-h7 3.Rb3-b1 Rh7-a7#

Key : 1.Rc3-c7! Re8-e1+ 2.Kh1-h8 Re1-b1 3.Rc7-h7 Rb1-b8#

Key : 1.Rc3-c8+! Ka8-a1 2.Rc8-c2 Re8-b8 3.Rc2-h2 Rb8-b1#

Judge's comment : Most suited to the spirit of the tourney. What is the most surprising is the fact that this could be done without any artificial twinning. I just love it!



Quick Composing Tourney, Helpmates section
Judge : The Greek Harry Fougiaxis, who proposed the following theme :

Theme : In a helpmate two-mover, with W1 (=first white move) a black piece is unpinned. Fairy conditions and pieces are allowed.

(Problem 270)
Kostas Prentos & Panagiotis Konidaris,
First-Second Honourable Mention, Quick Composing Tourney, Jurmala 2008
Helpmate in 2 moves. Two solutions.
h#2, 2111, (6 + 9)
[8/4B3/2K1Pr1p/3S2kp/r7/5ssP/6R1/bb6]


Key : 1.Sf3-h4! (blocks a flight) Be7-b4 (unpins bRf6, covers bRa4)
2 .Rf6-f5 (the unpinned piece blocks a flight) Rg2xg3# (captures the pinned bSf3)

Key : 1.Bb1-g6! (blocks a flight) Rg2-b2 (unpins bSf3, covers bBa1)
2.Sg3-f5 (the unpinned piece blocks a flight) Be7xf6# (captures the pinned bRf6)

Judge's comment : Surprising and aesthetically very pleasing shut-offs in the W1 moves, but the black play (comprising of square blocks only) even if accurate is less sophisticated.


(This post in Greek language).

Thursday, December 04, 2008

Solving Contest 2008-11-23, Chess Club of Patras

Sunday 23/11/2008, from [Chess Club of Patras Greece] site

Mr Pountzas is the winner
The Solving Contest of Patras was succesful. First winner was mr. Pountzas Chryssanthos, second winner was mr. Manolas Emmanuel, third winner was the 14-years(!) old Konstantinos Smpoukis. Very promising was also the fifth place for miss Antzela Mavromati (the only woman among contestants). The always faultless organizer Harry Fougiaxis gave prestige to the contest, while new horizons were opened for Fairy Chess by mr. Manolas Emmanuel.
(photo: Left to write, the arbitre Harry Fougiaxis, Manolas, Pountzas, Smpoukis)

More photos and the problems can be found here.



Saturday 01-11-2008

After 20 years, the Chess Problem Solving reappears in Patras, which has seen great solvers in the past. A Solving Contest will be held in the Chess Club of Patras : Sunday 23-11-2008, 11:00 pm. See details (in Greek) at the site of the Chess Club.


(This post in Greek language).

Thursday, November 20, 2008

Incoming links : 2008-02-07 to 2008-10-31

I would like to thank all the persons, who have honoured me by putting a link from their blog or their site pointing to my blog [kallitexniko-skaki.blogspot.com] .

The links were not equally effective, and this was expected of course. Some visitors follow the link, take a peek and never see those pages again. Hundreds of others study systematically, re-entering over 250 times, and staying several minutes in the pages of my blog.

In the period of operation of this blog, from 07-02-2008 to 31-10-2008, 2454 persistent visitors came from the following addresses. (In front of each address we write the present ranking and in parentheses the ranking of the address three months ago).

01 (01) From http://www.zinonchess.gr (Chess Club Zenon Glyfada) came 675 visitors.
02 (02) From http://skakistiko.blogspot.com (Chess blog, Cat of Schroendinger) came 303 visitors.
03 (03) From http://konidaris.blogspot.com (Writer – Solver Panagiotis Konidaris) came 212 visitors.
04 (06) From http://chess-problems-gr.blogspot.com (english speaking version of this blog) came 186 visitors.
05 (04) From http://4lyk-kallith.att.sch.gr (school, 4th General Lykeio of Kallithea) came 161 visitors.
06 (05) From http://www.sopatron.gr (Chess Club of Patras) came 129 visitors.
07 (11) From http://so-aigaleo.blogspot.com (Chess Club of Aegaleo) came 72 visitors.
08 (10) From http://alef-gr.blogspot.com (Science Fiction Club of Athens) came 69 visitors.
09 (07) From http://www.murdzia.com (Piotr Murdzia, Solver from Poland) came 54 visitors.
10 (09) From http://skakistasholeia.blogspot.com (Chess in schools, Ilias Economopoulos) came 45 visitors.

The following sources brought less visitors :

11 (18) http://neospalamedes.blogspot.com (New Palamede, Club Avax and Pessi)
12 (08) http://lykeio6o.blogspot.com (school, 6th General Lykeio of Kallithea)
13 (12) http://anyfantischess.blogspot.com (Zatrikion, mr. Anyfantis)
14 (--) http://skaki-thesprotia.blogspot.com (Chess Club of Thesprotia)
15 (15) http://alice-mirrorland.blogspot.com (Alice Montez)
16 (--) http://www.athenschess.gr (Chess Club SOP - SMAOK)
17 (30) http://www.skakistis.gr (Chess player – The official page of Chess Union of Salonika and ESK)
18 (--) http://www.sms-elefsinas.gr (Chess Educational Club of Elefsina)
19 (28) http://anoixichess.blogspot.com (Chess Springtime)
20 (14) http://freeskaki.blogspot.com (Free Chess, Herakleion Attica)
21 (22) http://www.greekbase.gr (Greekbase - Your Online Chess Supporter)
22 (16) http://anyfantis.blogspot.com (Weaver, mr Anyfantis)
23 (17) http://bstephen.me.uk (mr Brian Stephenson, British Chess Problem Society)
24 (21) http://edessa-chess.blogspot.com (Edessa – Chess Update)
25 (--) http://dimiourgiakaidiaskedasi.blogspot.com (Creation and Entertainment)
26 (--) http://el.wikipedia.org (Greek Wikipedia)
27 (20) http://www.essnachess.gr (Union of Chess Clubs of Attica)
28 (--) http://stelling.cc/xadrez (Problemas de Xadrez - Roberto Stelling from Brazil)
29 (24) http://adiple.blogspot.com (Navigating up-stream I search for Hope, Alexandra)
30 (--) http://alta-zor.blogspot.com (Altathor)
31 (25) http://greekchess.wordpress.com (Greek Chess Weblog)
32 (34) http://naftilos.blogspot.com (ANemos)
33 (13) http://www.pirgoschess.gr (Chess Club of Pyrgos Greece)
34 (19) http://psifiakiellada.blogspot.com (Digital Greece, Broadcasting with Nikos Vassilakos)

From the following addresses the visitors came only once.

35 (23) http://pitselischess.blogspot.com (Greg's page, Pitselos)
36 (26) http://www.patrachess.gr (Patra Chess - Makis Loukeris)
37 (27) http://angela-lucy.blogspot.com (Swimming Around - Angela Lucy)
38 (29) http://keipi.blogspot.com (Tales of a Crazy World - Panagiotis Koustas)
39 (31) http://sukumus.blogspot.com (Sukumus Fabulus Est - Dimitris Arvanitis)
40 (32) http://foufoutos.wordpress.com (Foufoutos)
41 (33) http://mor-fe-as.blogspot.com (Staying awake...)
42 (35) http://s.e.volou.googlepages.com (Chess Union of Volos Greece)
42 (--) http://www.chessvibes.com (ChessVibes)
43 (--) http://chesspellets.blogspot.com (Chess Pellets - Joaquim Crusats from Spain)

If someone is not included by mistake, please leave me a message to correct the omission. Thank you again.


(Similar list for the blog in Greek language).

Wednesday, November 19, 2008

Emmanuel Manolas (2)

The problems we see here belong to Fairy Chess, because they all have the condition Madrasi, (which is my favourite).

Madrasi : Opponent pieces of the same type are paralysed when they threaten one another. Each piece loses all other properties and keeps only the power of paralysing the opponent similar piece. Each piece regains all its properties at the moment the threat is interrupted.

The condition took its name from the city Madras of India, from which came the famous composer Abdul Jabbar Karwatkar. We will see first an excellent problem of his.

(Problem 261)
Abdul Jabbar Karwatkar,
First Prize, The Problemist 1983,
Mate in 2. Madrasi condition.
#2, Madrasi, ( 11 + 10 )
[6Rr/bR1P3k/1Ps1BP1b/qrB1SPp1/1p1KS3/p7/8/8]

Key : 1.Bf8! (bBh6 is paralyzed, the threat is [2.Se4xg5#], but the wK is exposed to four checks)
1...Qxb6+ 2.d8=Q#
1...Rxe5+ 2.d8=S#
1...Rd5+ 2.d8=R#
1...Bxb6+ 2.d8=B#

The problem shows the four promotions (it is an Allumwandlung (AUW) problem).


We see next original Madrasi problems by Manolas Emmanuel, (you may also see a Retro Madrasi 5-mover already presented here).

(Problem 262)
Manolas Emmanuel,
original,
Mate in 2. Madrasi condition.
#2, Madrasi, (5 + 3)
[1K1krb2/8/5S2/3S4/1B6/8/8/4R3]

Tries : {1.Ka8? / Ka7? Kc8!}, {1.Sf6-g4? / Sf6-h5? / Sf6-h7? / Sf6-g8? / Sf6xe8? Kd7!}, {1.Sf6-d7? Kxd7!}.

Key : 1.Sd5-e7! [2.Se7-c6# / Ba5# / Rd1#]
1...Bh6 2 Se7-c6#
1...Rxe7 2 Ba5#
1...Bxe7 2 Rd1#

With the key three threats are introduced but later they are separated.


(Problem 263)
Manolas Emmanuel,
original,
Mate in 2. Madrasi condition.
#2, Madrasi, (6 + 5)
[5krb/3K4/2S4S/7p/R6r/8/1B6/6R1]

Tries : {1.Kc7? (zz) / Kd6? (zz) / Kc8? (zz) / Ke6? (zz) Ke8!}, {1.Sh6-f5? (zz) / Sh6xg8? (zz) Kf7!}, {1.Sh6-f7? (zz) Kxf7!}.

Key : 1.Sc6-d4! [2.Sd4-e6# / Ra8# / Ba3#]
1...Rh4~ 2.Sd4-e6#
1...Rh4xd4 2.Ba3#
1...Bh8~ 2.Sd4-e6#
1...Bxd4 2.Ra4-a8#

The key cuts two lines of paralysis with triple threat, but in the variations only one of the threats is valid.


(Problem 264)
Manolas Emmanuel,
original,
Mate in 18. Madrasi condition.
#18, Madrasi, (10 + 11)
[krQR2rb/2p4p/q1b4P/K1p2p2/2P2P2/1R2p3/4P3/B6B]

In this more-mover problem the bK has minimum mobility and the wK has the ease to go and free its piece which will give the mate.
We show only the moves of the White.

Key : 1.Ka4! 2.Ka3 3.Ka2 4.Kb1 5.Kc2
6.Kd3 7.Kxe3 8.Kf2 9.Kg3 10.Kh4
11.Kg5 12.Kxf5 13.Ke6 14.Kf7 15.Kxg8
16.Rd8-d2 17.Rd2-a2 18.Ra2xa6#


(Problem 265)
Manolas Emmanuel,
original,
Mate in 3. Madrasi condition.
#3, Madrasi, (7 + 5)
[3k4/1p1P2p1/P2K1P1b/3R4/8/3R4/2B4/3r4]

The plan seems to be simple : One wR will sidestep to threat mate, the bR will stop it and then the other wR will be interposed... Let us see :

Try : {1.Rc5? Rc1!}.
Try : {1.Rc3? Rc1!}.
Try : {1.Re3? Bxe3!}.

Key : 1.Re5! [2.Re8+ Re1 3.Rd3-e3#]
1...Re1 2.Rd3-e3 [3.Re8# / Ba5#]
___2...Bxe3 3.Re5-e8#
___2...Bf4 3.Ba5#


(This post in Greek language).

Monday, November 03, 2008

Eight studies (Exercise 7)

A solution contest (De Feijter Study Competition) with eight studies was held in 2003, at Deventer in Holland. Several solvers participated, and some of them were champions in their countries.

What happened there was unprecedented. Mr Daniel Stellwagen, a 16 years old solver from Holland, solved all the studies in perfect manner. Today Stellwagen is Grand Master in chess, a solver and a composer.

The studies presented various grades of difficulty. The percentage of the solved studies is shown below :
Study 3rd: 81,25% (Zachodjakin, 1930)
Study 7th: 70,83% (Vukcevich, 1951)
Study 2nd: 65,58% (Bergqwist, 2002)
Study 6th: 56,67% (Clausen, 1927)
Study 5th: 45,83% (Bazlov, 1971)
Study 1st: 39,58% (Smyslov, 2000)
Study 4th: 35,00% (Stavrietsky/Ryabinin, 1999)
Study 8th: 30,00% (Smyslov, 2000)

The points of the solvers (7 points per study) were the following :
01 Daniel Stellwagen: 56
02 Marcel van Herck: 47, (4 times champion of Belgium)
03 Hans Boehm: 37
04 Eddy van Beers: 34
05 Harold v.d. Heijden: 32
06 Dolf Wissmann: 32, (champion of Holland in 1999)
07 Bert v.d. Marel: 26
08 Peter v.d. Heuvel: 25
09 Ed van de Gevel: 25
10 Harm Benak: 19
11 Andy Ooms: 12
12 Ward Stoffelen: 5

We took these studies (and the rest of the information) from the page with puzzle-17 of the Chessbase and we present them here. The impatient readers can see the solutions, prepared nicely by TD Rene Olthof, here.

Our proposal : Try to solve these studies. Take your time. After a few days we will post the solutions and you will compare these with your solutions. (Look at the end of this post).


Study 1st
(Problem 253)
Smyslov V.
Moi Etyudi #41, 2000
White plays and draws
= (4 + 5)
[8/5k1p/b3p3/2K3RP/5P2/8/p7/8]


Study 2nd
(Problem 254)
Bergqwist D.
Tidskrift for Schack, 2002
White plays and wins
+ (9 + 7)
[2q1SQSR/3k1PP1/3Prr2/4bR1p/8/3p4/8/4K3]


Study 3rd
(Problem 255)
Zachodjakin G.
First Prize, Shakmaty Listok, 1930
White plays and draws
= (5 + 4)
[5B1k/7p/6P1/4SsP1/8/8/K4p2/8]


Study 4th
(Problem 256)
Stavrietsky / Ryabinin
Studium, 1999
White plays and wins
+ (4 + 4)
[5K1k/1R1P4/8/b7/4r3/3B4/3p4/8]


Study 5th
(Problem 257)
Bazlov Y.
First Prize, Shakmaty v SSSR, 1971
White plays and wins
+ (4 + 3)
[s7/2S4K/8/k7/7R/2r5/8/S7]


Study 6th
(Problem 258)
Clausen S.
2nd/3rd prize, Sveriges SF, 1927
White plays and wins
+ (5 + 4)
[K5R1/7p/1B3PP1/1k7/8/8/6r1/7r]


Study 7th
(Problem 259)
Vukcevich M.
1951
White plays and draws
= (3 + 4)
[1R6/8/B7/8/8/1K6/1p2p3/k3s3]


Study 8th
(Problem 260)
Smyslov V.
Moi Etyudi #44, 2000
White plays and draws
= (4 + 4)
[8/8/6p1/5p2/p1k2P2/8/P6P/4K3]



(2008-11-07) Here are the solutions of the studies


Study 1st : Smyslov, V. - White plays and draws

Key : 1.Rg1! (the wR must stop the promotion of the Pawn) Bd3
2.h6 (planning 3.Rg7+ 4.Ra7, not 2.Ra1? Bb1 3.Kd6 h6!! –+ Black wins) Kf6
3.Ra1 Bb1
4.Kd6 (zz) Kf5 (or 4...Kg6 5.Kxe6 Kxh6 6.Kf6 Kh5 7.Kg7 h6 8.f5 Bxf5 9.Rxa2 = draw)
5.Ke7! (not 5.Kd7? e5! 6.fxe5 Kxe5 7.Ke7 Kd4 8.Kf6 Kc3 9.Kg7 Kb2 10.Rxa2+ Kxa2 –+ Black wins]) Kxf4
6.Kxe6 Kg5 (or 6...Ke4 7.Kf6 Kd3 8.Kg7 Kc3 9.Rxa2 Bxa2 10.Kxh7 Bb1+ 11.Kg7 = draw)
7.Kf7! Kxh6
8.Kg8! Kg6
9.Kh8 h5
10.Rxa2 Bxa2 = (stalemate!)


Study 2nd : Bergqwist, D. - White plays and wins

Key : 1.Qe7+! Rxe7
2.f8=S+ Rxf8
3.gxf8=S+ Kxe8
4.d7+ Qxd7
5.Sf6+ Bxf6+
6.Se6+ Kf7 (if 6...Bxh8 7.Rf8#)
7.Rf8+ Kxe6 (if 7...Kg6 8.R8xf6+ Kh7 9.Rxh5+ Kg8 10.Rf8#)
8.R8xf6#


Study 3rd : Zachodjakin, G. - White plays and draws

Key : 1.g7+! Sxg7 (if 1...Kg8 2.Sg4 f1=Q 3.Sf6+ Kf7 4.g8=Q#)
2.Sf7+ Kg8
3.Bc5! f1=Q
4.Sh6+ Kh8
5.Bd6! = (and this is a positional draw, because if the bS is lifted then wB checks the bK from the square e6, where the wB cannot be captured by the bQ, because of the fork of the wS).


Study 4th : Stavrietsky / Ryabinin - White plays and wins

Key : 1.d8=S! [2.Sf7+ [3.Be4#]] (not 1.d8=Q? Rf4+! = draw)
1...Re8+ (not 1...Bxd8? 2.Bxe4 Be7+ 3.Rxe7 d1=Q 4.Rh7#, nor 1...Rf4+? 2.Sf7+ Rxf7+ 3.Kxf7 d1=Q 4.Rb8+ Bd8 5.Rxd8#)
2.Kxe8 d1=Q
3.Kf8 Bb4+ (not 3...Qxd3? 4.Sf7+ Kh7 5.Se5+ +– White wins)
4.Rxb4 Qf3+ (not 4...Qxd3? 5.Rh4+ Qh7 6.Sf7#)
5.Bf5 (not 5.Sf7+? Qxf7+ 6.Kxf7 = stalemate) Qxf5+ (if 5...Qh5 6.Rh4 Qxh4 7.Sf7#)
6.Sf7+ Kh7
7.Rh4+ Kg6
8.Rh6#


Study 5th : Bazlov, Y. - White plays and wins

Key : 1.Rh5+! (not 1.Sxa8? Ka6!) Ka4
2.Sxa8 Rc1 (not 2...Ka3 3.Rh2! +- )
3.Sb6+ (not 3.Rh6? Ka3 = ) Ka3
4.Rb5! Ka2 (not 4...Rxa1 5.Sc4+ Ka2 6.Rb2#)
5.Sb3 Rb1
6.Sc4! Rxb3
7.Ra5+ Kb1
8.Sd2+ + (White wins)


Study 6th : Clausen, S. - White plays and wins

Key : 1.f7! (not 1.Ba7? Rxg6 2.f7 Rf6 = draw, nor 1.gxh7? Ra2+ 2.Ba7 Rxh7 = draw) Rf1
2.gxh7 (not 2.f8=Q? Rxf8+ 3.Rxf8 Rxg6 = draw) Rh2
3.Bf2! Rfxf2
4.Rg2 (not 4.Rb8+? Kc6 5.Rc8+ Kd7 6.Rc2 Rxc2 7.f8=Q Ra2+ 8.Kb7 Rhb2+ -+ Black wins) Rhxg2
5.h8=Q Rxf7
6.Qe8+ (if 6.Qe5+ Kb6 7.Qe6+) +- White wins


Study 7th : Vukcevich, M. - White plays and draws

Key : 1.Bd3! (not 1.Kc3? Sd3 -+ Black wins, nor 1.Ka4? Sd3 2.Bxd3 e1=Q 3.Rb3 Qd1 -+ Black wins)
1...Sxd3 (not 1...b1=Q+ 2.Bxb1 Kxb1 3.Re8 = draw)
2.Kc2 [3.Ra8#] Sc1 (not [2...e1=S+ 3.Kd2 b1=Q 4.Rxb1+ Kxb1 = draw, nor 2...Se1+ 3.Kd2 = draw)
3.Rxb2 e1=Q
4.Rb1+ Ka2
5.Ra1+ Kxa1 = stalemate


Study 8th : Smyslov, V. - White plays and draws

Key : 1.a3! (not 1.Kf2? a3! 2.Ke3 Kc3 3.h3 Kc4! 4.Kf3 Kd3 5.Kf2 Ke4
6.Kg3 Ke3 7.Kh4 Kd2 8.Kg5 Kc2 9.Kxg6 Kb2 10.h4 Kxa2
11.h5 Kb3 12.h6 a2 13.h7 a1=Q -+ Black wins) Kd3
2.Kf2 Ke4
3.Kg3 Ke3
4.h3 Ke4
5.Kh4 [6.Kg5] Kxf4 = stalemate


(This post in Greek language).