Saturday, 18 February 2017

Fortress 2

G. Kasparian
Shakhmaty (Riga)
1973
2nd/3rd Prize

Draw

1. Nh2+ Kg3 2. Bf7! 2. Nf1+? Kxh3 3. Bf7 Bf2+! 4. Kxf2 a1=Q 5. Be6+ Kh4 -+ 2... a1=Q+ 3. Nf1+ Kg4 3... Kxh3?? 4. Be6# 4. Be6+ Kh5 5. Bd5! Qd4+ 6. Kh2 Qe5+ 6... Qxd5 7. Nf4+ = 7. Kg1 Kg4 7... Qd4+ 8. Kh2 positional draw - perpetual threat of fortress; 7... Bf2+ 8. Kxf2 Qf5+ 9. Bf3+ = 8. Bg2!


fortress

8... Bg3 9. Kh1 Qd4 10. Ng1 Qh8+ 11. Nh3 Bf4 12. Kg1 Qd4+ 13. Kh1 =

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Wednesday, 15 February 2017

Fortress 1

W. Rudolph
The Chess Amateur
1912

Draw

1. Ba4+! 1. c4+? Kxc4 2. Bd3+ Kd5 3. Be4+ Ke6 4. Bf5+ Kf7 -+ 1... Kxa4 1... Kc4 2. Bb3+ Kb5 3. Ba4+ perpetual check 2. b3+ Kb5 3. c4+ Kc6 4. d5+ Kd7 5. e6+ Kxd8 6. f5! = Black cannot win despite its huge material advantage!


fortress

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Tuesday, 17 January 2017

Study 109

Árpád Rusz
Magyar Sakkvilág
2016
- after M. Hlinka & L. Kekely -

White wins

1. Rb5+ 1. Rh7+? Kc6 2. Bb5+ Kb6 3. Nd7+ Ka5 =
a. 1... Kc6 2. Nd5! White must block the d-file but it also has to protect the f4-square. Thematic try: 2. Nd7? Rg2+ 3. Kxf1 Rf2+ 4. Kxe1 c1=Q+ 5. Kxf2 Qf4+ 6. Ke1 Qc1+ 7. Kf2 Qf4+ perpetual check 2... Rg2+! 3. Kxf1 3. Kd3? c1=N+! -+ 3... Rf2+ 3... Rg1+ 4. Ke2! +- (4. Kxg1? Qg5+ =) 4. Kxe1 c1=Q+ 5. Kxf2 Qc2+ 5... Qf4+ 6. Nxf4 +- 6. Be2 Qxf5+ 7. Ke1 Qdxd5 7... Qfxd5 8. e7+ +- 8. e7+! Kd7 9. e8=Q+! Kxe8 10. Rh5!!


Grip Theme

10... Qxb5 10... Qxh5 11. Bxh5+ Ke7 12. Rxd5 +- 11. Bxb5+ Ke7 12. Rxf5 +-

b. 1... Kc8 2. Ne7+! Thematic try: 2. Nd6+? Qxd6 3. Rh8+ Kc7 4. Nd5+ (4. Ne8+ Kc6 =) 4... Qxd5! = 2... Qxe7 3. Rh8+ Kc7 4. Nd5+ Kd6 5. Nxe7 Ng3+ 5... c1=N+ 6. Kxe1! +- (6. Kd1? Ne3+ 7. Kxc1 Bc3+ 8. Bf1 Rxf1#); 5... Rg2+ 6. Kxf1 Rf2+ 7. Kg1! (7. Kxe1? c1=Q+ =) 7... c1=Q 8. Nc8+! (Thematic try: 8. Rd8+? Kxe7 9. Rd7+ Kf6 10. Rf7+ Kg6 11. Bd3+ Rf5! 12. Bxf5+ Kh6! 13. Rh7+ Kg5 =) 8... Kc6 9. Na7+ Kd6 10. Rd8+ Ke7 11. Rd7+ Kf6 (11... Ke8 12. Rb8#) 12. Rf7+ Kg6 13. Bd3+ Kh6 14. Rh7# 6. Kf3! Thematic try: 6. Kd3? c1=Q 7. Nc8+ Kc6 8. Na7+ Kd6 9. Rd8+ Ke7 10. Rd7+?? Kf6 11. Rf7+ Kg6 -+ White has no check on the d3-square because it is blocked by the wK! 6... c1=Q 7. Nc8+! Thematic try: 7. Rd8+? Kxe7 8. Rd7+ Kf6 9. Rf7+ Kg6 10. Bd3+ Nf5! 11. Bxf5+ Kh6 12. Rh7+ Kg5 13. Bb1+ Kf6 14. Rf7+ Kxe6 15.Ba2+ Kd6 16. Rd5+ Kc6! = The black king escapes, because the missing Na6 doesn't control the c6 square! 7... Kc6 8. Na7+ Kd6 9. Rd8+ Ke7 10. Rd7+ Kf6 11. Rf7+ Kg6 12. Bd3+! +-

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Related study: Grip 10

Thursday, 24 November 2016

Corresponding Squares 1

Ébersz K.
Magyar Sakkvilág
1930

Draw

1. Kb2! Kg8!

2. Ka1!! This is the only move to draw! 2... Kf8 3. Ka2 Ke8 4. Ka3 Kd8 5. Ka4 Kd7 6. Kb4 Kc6 7. Ka5 Kd7 8. Kb4 Ke6 9. Kc3 Kf5 10. Kd2 Kg4 11. Ke2 Kg5 12. Kd1 Kg6 13. Kc1 Kg7 14. Kb1 Kg8 15. Ka1! positional draw - corresponding squares

Study 108

Árpád Rusz
The Problemist
2016-17

Draw

1. Rc8+ 1. Rxa2? Bxa2 2. Rc8+ Kb2 -+ 1... Kb2 2. Bb4 Bc2+! 2... Kxa1?? 3. Bc3#; 2... Nxa1 3. Bxa5 Bc2+ 4. Ke1! Nb3 5. Bc3+ Kc1 6. Ra8 Bb1 (6... a1=Q 7. Bxa1 Nxa1 8. Rxa3 =) 7. Rxa3 Kc2 8. Rxb3! Kxb3 9. Kd2 (9. Ba1? Kc2 10. Ke2 Kc1 -+) 9... Bd3 10. Ba1 = 3. Rxc2+ Kxa1 4. Rc1+! 4. Bxa5? Nxa5 5. Kc1 Nb3+ 6. Kd1 Kb1 -+; 4. Bc3+? Kb1 -+ 4... Nxc1 4... Kb2?? 5. Bc3#


WCCT-6 Theme

5. Kc2!! Thematic try: 5. Kxc1? Rb5 6. Bc3+ Rb2 mutual zugzwang


WTM - virtual stalemate

7. Ba5 Rxf2 8. Bb4 Re2 9. Bc3+ Rb2 mutual zugzwang - virtual stalemate 10. Ba5 Rb3 -+ 5... Rb5 6. Bc3+ Rb2+ 7. Kxc1 stalemate


BTM - stalemate

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Thursday, 29 September 2016

Study 107

Á. Rusz
Chess Informant-50 JT
2016
3rd Honourable Mention

White wins

1. Nc7+ 1. Rc8? R3a6+! 2. Kb5 Rxe6 3. Qf8 Re5+ 4. Kb4 Re4+ 5. Kc3 Re3+ 6. Kc2! Re2+ (6... Ra2+? 7. Kb1 +-) 7. Kd1 Re1+ 8. Kc2 Re2+ 9. Kd3 Re3+ 10. Kc2 Re2+ perpetual check 1... Bxc7+ 2. Kxc7 b5+ 3. Kc6! 3. Kc8? Rh3! (3... Rg3? 4. Rg4 +-) 4. Qb2 Ne3! 5. Qe5 (5. Rc7 Nd5! 6. Rb7! Rh8+! (6... Rxb7? 7. Qa2+ Ra7 8. Qxd5+ Rb7 9. Qxb7#) 7. Qxh8 Rxb7 8. Qa1+ Ra7 9. Qh1 Rc7+ 10. Kd8 Rc5 =) 5... Rb7 6. Rc6 Rh8+! 7. Qxh8 Rb8+ 8. Kc7 Nd5+! (8... Rxh8? 9. Ra6# echo) 9. Kd6 Rxh8 = 3... R7a6+ 3... bxc4 4. Qf8#; 3... R3a6+ 4. Kxb5 Rb7+ 5. Kxa6 Rxb4 6. Rxb4 +- 4. Kxb5 R3a5+ 5. Qxa5 Rxa5+

6. Kb6!! 6. Kxa5? Kb7 7. Kb5 (7. Re4 Kc6 8. Kb4 Kd5 =) 7... Ne3 8. Rf4 (8. Rd4 Kc7 9. Kc5 Nf5 =) 8... Nd5 9. Rf7+ Nc7+ 10. Kc5 Kc8 11. Kc6 Ne8 12. Ra7 Kd8 13. Rf7 Kc8 positional draw 6... Kb8 6... Ra1 7. Rc8# echo 7. Re4! Ra6+ 7... Kc8 8. Kxa5 +-; 7... Rh5 8. Re8# 8. Kxa6 Kc7 9. Kb5 Kd6 10. Kc4 +-

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Tuesday, 27 September 2016

Study 106

Á. Rusz
Strategems
2016

White wins

1. bxc7 Rc2+ 1... Ne6+ 2. Kc6! (2. Kb6? Rd6+ =) 2... Rc2+ (2... Nxc7 3. Kxc7 Ka7 4. Bc3 Rd5 5. Rc6 Rb5 6. Bd4+ Ka8 7. Ra6#) 3. Kb6 Nf8! (3... Nxc7 4. Rh8+ +-) 4. Be5! (4. Rh8? Rb2+! 5. Ka6 (5. Bxb2 stalemate) 5... Ra2+ 6. Kb6 Rb2+! 7. Kc6 Rc2+ 8. Kb6 Rb2+ perpetual check/stalemate) 4... Nd7+ 5. Ka6 Ra2+ (5... Nxe5 6. Rh8#) 6. Kb5 Kb7 7. Rh8 Rc2 8. Rb8+! Nxb8 9. cxb8=Q# 2. Bc3!! 2. Kb6? Rc6+ 3. Kb5 Rxc7 = 2... Rxc3+ 3. Kb6 Rb3+ 3... Nf7 4. Rh3! Rxc7 (4... Rxh3 5. c8=Q#) 5. Kxc7 +- 4. Ka6 Rb8! self-fork 4... Ra3+ 5. Kb5 Rb3+ 6. Ka4! (6. Kc4? Rb8 7. Rh8 Rc8 =) 6... Rb8 7. Rh8 +-

5. Rg6!! mutual zugzwang 5. Rf6? Nc6! 6. Rxc6 (6. cxb8=Q+ Nxb8+ 7. Kb6 Nd7+ =) 6... Rb6+! 7. Kxb6 stalemate; 5. Rh8? Rb6+! (or 5... Nc6 6. cxb8=Q+ Nxb8+ 7. Kb6 stalemate) 6. Ka5 (6. Kxb6 stalemate) 6... Ra6+! 7. Kb5 Rb6+ 8. Ka5 Ra6+ perpetual check/stalemate; 5. Rd6? Nf7 6. cxb8=Q+ Kxb8 = 5... Rc8 5... Nf7 6. cxb8=Q+ Kxb8 7. Rg8+ Kc7 8. Rg7 +- 6. Rg8 Rxc7 7. Rxd8+ Rc8 8. Rxc8#

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Thursday, 15 September 2016

Saavedra 1

F. Saavedra & G. Barbier
Glasgow Weekly Citizen
1895
- version -

1. c7 Rd6+ 2. Kb5 2. Kb7? Rd7 = 2... Rd5+ 3. Kb4 Rd4+ 4. Kb3 minor dual 4. Kc3 Rd1 5. Kc2 4... Rd3+ 5. Kc2 Rd4!


Saavedra's rook promotion

6. c8=R!! 6. c8=Q? Rc4+! 7. Qxc4 stalemate 6... Ra4 7. Kb3! +-


Saavedra's double threat

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Sunday, 11 September 2016

Study 105

Á. Rusz & P. Gyarmati
Die Schwalbe
2016

White wins

1. O-O-O! 1. Kd2? Be4 = 1... Be4 2. Re1! 2. Kb2? a3+ 3. Ka1 Kc4! mutual zugzwang (3... Kc3? 4. Rh1! Bxh1 5. h7 Be4 6. h8=Q+ +-) 4. Ka2 Kc3! 5. Kxa3 Kc2 6. Rf1 Kd3! (6... Kd2? 7. Rf2+ +-) 7. Re1 Kd2! = 2... Kc5! 2... Kb3 3. Re3+ +- 3. Kb2 Kb5 3... Kd4 4. Rh1! R sacrifice 4... Bxh1 5. h7 Be4 6. h8=Q+ +- 4. Rc1 Kb4 4... Kb6 5. Ka3 Kb5 6. Ra1/Rf1 Kc4 7. Rd1 Kc5 8. Re1 Kb5 9. Rc1 Ka5 10. Rc5+ Kb6 11. Rh5 +-


cyclic zugzwang - WTM

5. Ka2 Bd5+ 6. Ka1! This is the first king move to a corner square. 6... Be4 7. Kb2 Using a king triangulation, white managed to transfer the move to black.


cyclic zugzwang - BTM

7... a3+ 8. Ka1! With the second king move to a1, white is reaching a mutual zugzwang position. 8. Ka2? Bd5+ 9. Ka1 Be4 positional draw 8... Kb5 8... Kb3 9. Re1 Kc2 10. Re2+ +- 9. Ka2 Kb4 10. Re1 Bd5+ 11. Ka1! +- The third king move to a1! During the 11-moves-long play, white managed to interchange its king and rook on the a1 and e1 squares, while black looks like it has played only one move (a4-a3)!

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Sunday, 4 September 2016

Study 104a

M. Minski
Sinfonie Sacchistice-50 AT
2015
6th Commendation

White wins

1. Kb3! 1. Nd4? b4+ 2. Kb3 Na5+ 3. Kxb4 Kxb2 = 1... Na5+ 2. Kc3 b4+! 2... Nc4 3. Na3+ Nxa3 4. Bxa3 +- 3. Nxb4! Nc4 4. Ba1! 4. Kxc4? Kxb2 = 4... Na3 4... Kxa1 5. Kc2! Na5 6. Kc1 Nb3+ 7. Nxb3# 5. Nb3 Nb5+ 6. Kc4! 6. Kd3? Nd4! 7. Kxd4 stalemate 6... Nd4! 7. Bc3! 7. Bxd4? stalemate; 7. Kxd4? stalemate

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Related studies: Study 104

Study 104

Á. Rusz
2016
Internet (RCS blog)
- after M. Minski -

White wins

In the initial position the white pieces form a 2x2 cluster.

1. Nxc5! 1. Nxa5? Bd4+! (1... Bb4+? 2. Kb3! (2. Nxb4? stalemate) 2... Bxa5 3. Na3#) 2. Nxd4 b4+! 3. Kb3 stalemate 1... b4+! 1... Nc4 2. Na3+ Nxa3 3. Bxa3 +- 2. Nxb4 Nc4!

3. Ba1!! 3. Kxc4? Kxb2 = 3... Na3 3... Kxa1 4. Kc2! Na5 5. Kc1 Nb3+ 6. Nxb3#; 3... Na5 4. Nc2 +- 4. Nb3 Nb5+ 5. Kc4 5. Kd3? Nd4! 6. Kxd4 stalemate 5... Nd4! 6. Bc3! 6. Bxd4? stalemate; 6. Kxd4? stalemate

In the final position we have a different 2x2 cluster of the same four white pieces!

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Related studies: Study 104a

Study 103a

C. Poisson
Gorgiev 100 MT
2010
1st Prize

White wins

1. Ka6! 1. Bd7? Qf4 =; 1. Kb6? Qe3+ = 1... Qc4 2. Bd7! 2. Kb6? Qg8 3. Bd7 Qb8+ = 2... Ka2 3. Kb6 Qd4+ 3... Qf7 4. Bf5 Qf6 5. Kb7 Ka3 6. c7 +- 4. Kb7 Ka3 5. Kb8! Ka4 5... Qd6+ 6. c7! Qxd7 7. Rb6! Qd4 8. Ra6+ Kb4 9. c8=Q +- 6. Rb7 Qh8+ 7. Bc8! Ka5 8. c7 mutual zugzwang


2x2 white cluster

8... Qf8 8... Qe8 9. Rb3! +- mutual zugzwang; 8... Qg8 9. Rb1! +- mutual zugzwang 9. Rb2! mutual zugzwang 9. Rb1? Qg8! mutual zugzwang 10. Rb2 (10. Rd1 Qb3+ =) 10... Qf8! mutual zugzwang 11. Rb3 Qe8! mutual zugzwang 12. Rb7 (12. Rd3 Qb5+ =) 12... Qh8! mutual zugzwang 9... Qh8 10. Rd2 Kb6 11. Rd6+ Kc5 12. Rd8 Qb2+ 13. Bb7 +-

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Related studies: Study 103

Study 103

Á. Rusz
Internet (RCS blog)
2016
- after C. Poisson -

White wins

1. Rb7+! 1. c7? Qd4+ fork 2. Kb8 Qxg7 = 1... Ka5! 1... Kc5 2. c7 Qa3+ 3. Kb8 +- White wins because of the closed a3-f8 diagonal: Qf8 is not possible.; 1... Kc4 2. Be6+ (2. c7? Qa3+ 3. Kb8 Now the a3-f8 diagonal is open. 3... Qf8! 4. Rb1 Kc5 5. Kb7 Qf3+ 6. Kb8 Qf8 positional draw) 2... Kc5 3. c7 Qa3+ 4. Kb8 +- 2. c7 Qd4+ 2... Qd7!? 3. Kb8 (3. Bxd7? stalemate) 3... Qe8 4. Rb3! Qf8 5. Rb2! Qh8 6. Rd2 +- see the main line.

3. Ka8!! Triangulation! Thematic try: 3. Kb8? Qh8! mutual zugzwang 4. Rb1 Qg8! mutual zugzwang 5. Rb2 (5. Rd1? Qb3+ = fork) 5... Qf8! mutual zugzwang 6. Rb3 (6. Rd2 Qb4+ +- fork) 6... Qe8! 7. Rb7 (7. Rd3 Qb5+ = fork) 7... Qh8 positional draw featuring four pairs of corresponding squares!

3... Qh8 4. Kb8 mutual zugzwang 4. Rb8? Qe5! (4... Qg7? 5. Bd7! Qxd7 6. c8=Q +-) 5. Rb7 Qe8! Triangulation 6. Kb8 Qh8! =


2x2 white cluster

4... Qg8 5. Rb1! mutual zugzwang 5... Qf8! 6. Rb2! mutual zugzwang. It is still too early to switch the rook to the d-file. 6. Rd1? Kb6 = The d6 square is protected! 6... Qh8 The queen has to abandon the protection of the b4 and d6 squares. 7. Rd2! Black doesn't have the Qb4+ fork anymore. 7... Kb6 8. Rd6+ The queen is not protecting d6. 8... Kc5 9. Rd8 The rook unpins the bishop. 9... Qb2+ 10. Bb7 +-

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Related studies: Study 103a

Tuesday, 30 August 2016

Visiting all edges of the board 3

P. Quindt
Feenschach (tt)
1954
1st Prize

Draw

1. Nf1+ Kh3 2. Ng1+ Kg4 3. Nh2+ Kg5 4. Nh3+ Kh6 5. Ng4+ Kh7 6. Ng5+ Kg8 7. Nh6+ Kf8 8. Nh7+ Ke7 9. Ng8+ Kd7 10. Nf8+ Kc8 11. Ne7+ Kb8 12. Nd7+ Ka7 13. Nc8+ Ka6 14. Nb8+ Kb5 15. Na7+ Kb4 16. Na6+ Ka3 17. Nb5+ Ka2 18. Nb4+ Kb1 19. Na3+ Kc1 20. Na2+ Kd2 21. Nb1+ Ke2 22. Nc1+ Kf1 23. Nd2+ Kg1 24. Ne2+ Kh2 25. Nf1+ perpetual check

Both white knights visit every files and ranks of the board! Every edge is visited exactly twice by each knight. For this task, the author used an initial position with several promoted black knights...

Visiting all edges of the board 2

Y. Afek
WCCC Thematic Tourney
2003
2nd Prize
- version -

Draw

1. Nf8! g5 2. Nh7! g4 3. Nf6 g3 4. Nh5 g2 5. Nf4 g1=Q 6. Ne2+ Kd2 7. Nxg1 Ke3! 8. Nh3 b5 9. Ng5 b4 10. Nf7! b3 11. Nd6! (11. Ne5? Kd4 -+) 11... Kd3 12. Nb5 b2 13. Na3 b1=Q 14. Nxb1 The knight has visited all edges of the board.

Monday, 29 August 2016

Visiting all edges of the board 1

O. Pervakov
Sadykov-80 MT
2016
1st Prize

White wins

1. Nb6+ 1. Rxd3? Rh8 = 1... Kb8 1... Kb7 2. Rf5 Nxh7 3. Rf7+ Ka6 4. Rxh7 +- 2. Nd7+ Ka8 3. Nf8! Nxh7 4. Nxh7 e4 5. Re3 5. Rh3? Rg8+ 6. Kf2 Rg4 7. Rh2 Ka7 8. Ke3 h3! 9. Rxh3 Rg2 10. Kxe4 Rxd2 = 5... Rg8+ 6. Kh1! 6. Kh2? h3 7. Rxh3 Rg6 = 6... h3 7. Nf6 Rg2 8. Nxe4 Re2


Paralysis

9. a6! 9. Kg1? h2+ 10. Kh1 Kb8 11. a6 Ka7 = mutual zugzwang 9... Ka7 10. Kg1 h2+ 11. Kh1 mutual zugzwang 11... Ka8 11... Kxa6 12. Rxe2 (minor dual 12. Nc5+) 12... dxe2 13. Nc5+ Kb5 14. Nd3 Kc4 15. Ne1 +- The knight has visited all edges of the board!

12. Nc3 Rxd2 13. Nb5 Rb2 14. Re8#

Study 102a

V. Tarasiuk
Sadykov-80 MT
2016
Commendation
- version by A. Zhukov -

Draw

1. d7 d1=Q 2. d8=Q+ Qxd8 3. Nxd8 b5 3... Ke7 4. Nxb7 = 4. Nxe6+ Kf7 5. Ng5+ Kf6 6. Ne4+ Ke5 7. Nc3! b4 8. Na2 b3 9. Nc1 b2 10. Nd3+ Kd4 11. Nxb2 g5 12. Nd1 g4 13. Nf2 g3 14. Nh3 = The knight has visited all files, ranks and edges of the board!

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Related studies: Study 102

Study 102

Á. Rusz
Internet (RCS blog)
2016
- after V. Tarasiuk & A. Zhukov -

Draw

1. Nh7+ Ke7 1... Ke8 2. Nd6+ Kd7 3. Nxb5 Ra8+ 4. Kg7 = 2. d6+ Ke6! 2... Kd7 3. Nf8+ Kc6 4. d7 Ra8 5. d8=Q Rxd8 6. Nxd8+ =; 2... Ke8 3. Nc5 g4 4. Nf6+ Kf7 5. Nxg4 = 3. Nf8+! 3. Nxg5+? Kd7 4. Nc5+ Kxd6 -+ 3... Kf7 4. d7 Ra8 5. d8=Q 5. Nd6+? Ke7!


chameleon echo

(5... Kxf8?? 6. Nc8 +-) 6. Nc8+ Kd8 7. Nb6 Rb8 8. Ne6+ Ke7+ 9. d8=Q+ (9. Nc8+ Kxd7 -+ chameleon echo)


chameleon echo

9... Rxd8+ 10. Nxd8 Kxd8 -+ 5... Rxd8 6. Nxd8+ Kxf8

7. Ne6+ Kf7 8. Nxg5+ Kf6 9. Ne4+ Ke5 10. Nc3! b4 11. Na2 b3 12. Nc1 b2 13. Nd3+ Kd4 14. Nxb2 g5 15. Nd1 g4 16. Nf2 g3 17. Nh3 = This knight has visited all files, ranks and edges of the board!

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Related studies: Study 102a