Study 191

Arpad Rusz
Chess Artistry Adventure
2022
Draw

Despite being blocked, the pawn is extremely dangerous. Black has a simple winning plan: bring the queen to c1 after finding a safe square for the black king (e.g. b8). This forces white to take immediate action by trying to give a perpetual check.

1. Qf5+ 1. Qd3+? Ke8 2. Qb5+ Kf8 3. Qb4+ Kg8 4. Qc4+ Kg7 5. Qc7+ Kh6 6. Qb6+ Qg6! 7. Qxb2 Qg7+ -+ 1... Kc6 2. Qe6+ Kc5 3. Qd6+ Kc4 4. Qd4+ Kb3 5. Qd3+ Ka2 6. Qc4+ Kb1! The black pawn is blocked again. The white queen is in an optimal position, so let's move the king! 6... Ka1 7. Qa4+ Kb1 8. Qd1+ Ka2 9. Qa4+ perpetual check

7. Kf6! One more check would be a mistake. 7. Qd3+? Kc1 8. Qc4+ Kd1 9. Qd3+ Qd2 10. Qb1+ Ke2 11. Qe4+ Qe3-+ White loses due to the unfortunate position of its king. 7... Qf2+ 7... Qc2 8. Qf1+ Ka2 9. Qa6+ Kb1 10. Qf1+ perpetual check 8. Kg7! Qa7+ In order to try to free its king, the black queen has to take control of the a-file. 9. Kh8!!

That is the only safe square! 9. Kg6? Ka1 10. Qc3 Qa6+ The 6th rank is bad for the white king because of this check. 11. Kg7 Ka2 -+; 9. Kg8? Qa2 -+; 9. Kf8? Ka1 10. Qc3 Qa6 11. Qd4 Ka2 12. Qd5+ Ka3 13. Qc5+ Kb3 14. Qd5+ Qc4 15. Qb7+ Qb4+-+ This variation would be draw by wk on h8. 9... Ka1 10. Qc3 Ka2 11. Qc4+ Ka1 12. Qc3 Qa6 13. Qd4/e5 Ka2 14. Qd5+ Ka1 15. Qd4 =

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(You can analyze the study with the help of the Syzygy tablebases here.)

This study was inspired by the game Janowski-Marshall (Monte Carlo, 1901). After some hesitation, Janowski has found the right strategy and headed with the king to h8.

Study 188

Árpád Rusz
2021
Dedicated to Marc Bourzutschky
White wins

White has a disadvantage of two exchanges. In order to win, not only one but both rooks should be captured. The awkward position of the black king gives some hope to succeed. 1. Bf3+! Re4 2. Bxh4 Of course not 2. Bxe4+? Rxe4 -+ 2... Nxh4 2... Kb8 3. Bg3+! -+

3. Bh1!! mutual zugzwang 3. Bxe4+? Kb8 mutual zugzwang 3... Kb8 4. Bxe4 Mutual zugzwang & Domination!

4...Bc5 The only safe square on the a7-g1 diagonal. 5. Kb5 The white king gains an important tempo in the race toward the black knight. 5... Be7 6. Kc6 Kc8 7. Kd5 Kd7 8. Ke5 Bc5 9. Kf6 9. Kf4? Ke6 10. Kg4 Ke5 = 9... Be7+ 10. Kf7 Kd6 11. Nf2 Bd8 12. Nd3! and white wins.

The black king is restricted to a small portion of the board and will be gradually pushed back to the side of the board by the two white knights. 12... Bg5 13. Na3 Kd7 14. Nc4 Kd8 15. Nc5 Bc1 Stepping with the king further back leads to a quick checkmate: 15... Kc8 16. Ne6 Bc1 17. Ke8 Bh6 18. Nd6+ Kb8 19. Nb5 Kc8 20. Nc5 Be3 21. Na6 Bf4 22. Na7# 16. Kf6 After this move, the white bishop also gets some freedom to move. 16... Bh6 17. Ne6+ Kd7 18. Nb6+ Kd6 The black king is back again to d6 and the black knight seems safe as long as the black bishop controls g5. How to win this position?

19. Ba8! (or 19. Bh1!) 19... Bc1 20. Nc4+ Kd7 21. Bb7! Domination! 21... Bh6 22. Ne5+ Kd6 23. Nf7+ +-

This study is based on a position found in one of the 8-man mutual zugzwang lists released by Marc Bourzutschky. For finding that special position (see the solution after 3.Bh1!!), I have created a special version my software SEE (Syzygy Endgame Explorer) to support some searches up to 8 pieces.

Study 183

Árpád Rusz
Mikitovics-70 JT
2020
- draw section -
4th Place

Draw

1. Rh2! White has to hide its rook! The rook wouldn't be safe on g3: 1. Rg3? Kd4 2. Kd6 Ke4 3. Ke6 Kf4 -+ The rook is caught! 1... Kb4 2. Kb7! Thematic try: 2. Kb6? Kxa4 3. Ka6 The close opposition doesn't work. Kb4 4. Kb6 Kc4 5. Kc6 Kd4 6. Kd6 Ke4 7. Ke6 Kf3 (7... Kf4? 8. Kf7 Kg3 9. Rxg2+! Rxg2 10. Kxg7 =; 7... Re1? 8. Rxg2 Kf3+ 9. Kf7 =) 8. Kf7 Ra1 (b1, c1) 9. Rxg2 Ra7+! -+ 2... Kxa4

3. Ka8!! Distant opposition! The king must be also hidden. 3... Kb5 3... Ka3 4. Ka7 Ka2 5. Ka8! Only there! 5... Kb2 6. Kb8 Kc2 7. Kc8 Kd2 8. Kd8 Ke2 9. Ke8 Ke3 10. Ke7 Kd3 11. Kd7 Kc3 12. Kc7 Kb3 13. Kb7 Ka3 14. Ka7 Ka2 15. Ka8 positional draw 4. Kb7 Kb4 5. Kb8! Kc5 6. Kc7 Kc4 7. Kc8! Kd5 8. Kd7 Kd4 9. Kd8! Ke5 10. Ke7 Ke4 11. Ke8! Kf3

12. Kf8! White should avoid the f7 square. 12... Ra1 13. Rxg2! Kxg2 14. Kxg7 =

This study features a rare, 10-square main zone of corresponding squares generated by opposition.

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Study 159

Árpád Rusz
Die Schwalbe
2018

White wins

1. Bc3+ Qd4! 1... Ke4 2. Rxg1 +-

2. Ba1!! mutual zugzwang 2. Bxd4+? cxd4 mutual zugzwang 3. Kd7 Kd5 mutual zugzwang 4. Kc7 Kc5 mutual zugzwang 5. Kd7 Kd5 positional draw 2... Qxa1 2... Kd5 3. Bxd4 cxd4 4. Kd7! mutual zugzwang - chameleon echo (4. Kf6? Ke4 =)

chameleon echo zz

3. Rxa1 c4 4. Kd7 4. Rc1? Kd4 5. Kd6 c3 = 4... Kd5 5. Rc1 mutual zugzwang 5... Kc5 5... Kd4 6. Kc6 c3 7. Kb5 Kd3 8. Kb4 +- 6. Kc7! +- mutual zugzwang - chameleon echo 6. Ke6? Kd4 =

chameleon echo zz

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Study 158

Árpád Rusz
Moscow Ty
2018
1st Prize

White wins

1. Kb1 1. g7?? Ra1# 1... Rb2+ 2. Ka1! The king moves to the first corner square. 2... Rxc2 3. g7 Rd2

4. Rh1!! This surprising sacrifice to the second corner is the only way to win. Besides attracting the black king to a worse square, the white rook has the idea of getting to the other side of the yet unborn queen! 4. g8=Q? Rxd1+ 5. Ka2 c2 =; 4. Rxd2+? cxd2 5. g8=Q d1=Q+ =; 4. Rc1? Rd8 =
Thematic try: 4. Rf1? This move also attracts the black king to a worse square, but as we will see, it has the negative effect of blocking the eight rank few moves later. 4... Rd8 (4... Kxf1? 5. g8=Q Rd1+ 6. Ka2 c2 7. Qc4+ +-) 5. Rf8 Rd1+ 6. Ka2 c2 7. g8=Q?? (7. Rc8 =) 7... c1=Q -+

In a QR/QR endgame, the winner is usually the one who gives the first check. Now 8. Qa8+ is impossible, black is going to win!

Let's return to the main line.
4... Rd8 4... Kxh1 5. g8=Q Rd1+ 6. Ka2 c2 7. Qh7+ +- 5. Rh8! This is the third move to a corner square! 5... Rd1+ 6. Ka2 c2 7. g8=Q c1=Q If we compare with the thematic try, here the white rook doesn't block the queen's path to the fourth corner (Loyd Clearance with a peri-anticritical manoeuvre). 7... Ra1+ 8. Kb3! (8. Kxa1? c1=Q+ =) 8... c1=Q 9. Qd5+ +-

8. Qa8+! White completes the task of visiting all corners of the board. 8... Kg3 9. Qb8+ Kg4 10. Qb4+ Qf4 11. Rh4+! +- The game ends with another rook sacrifice.

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Study 152

Árpád Rusz
RCS blog
2018

White wins

1. g4! 1st knight sacrifice 1... hxg3 e.p. 1... Bxe4 2. a6 +- 2. Nxg3+ Kg2

3. Nh1!! 2nd knight sacrifice 3. Nh5? Bc4! (3... Kxh3? 4. Nf4+ +- echo) 4. h4 Kh3 = 3... Be2 3... Kxh3 4. Nf2+ +- echo; 3... Kxh1 4. h4 Kg2 5. h5 Kf3 6. h6 Kf4 7. a6! Kg5 8. a7 +- 4. h4 Kh3! 4... Kxh1 5. Ke7 Kg2 6. Kf6 Kg3 7. Kg5 +- 5. h5! Bxh5 6. Nf2+ Kg3 7. Ne4+

Rundlauf

7... Kf4 8. a6! 3rd knight sacrifice 8... Kxe4 9. a7 +-

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An example of a Syzygy Endgame Explorer search

White wins

The only move to win is 1. Qh1!!
This position was found with the help of SEE using the following commands:

[Tablebase "KQPkrr"]
[Output "out.pgn"]

[Position "1"]
[Eval "win"]
[SideToMove "white"]
[Piece2 "a8"]
[Piece5 "rank1"]
[Piece6 "fileH"]
[OnlyMove "yes"]
[Move "Qa8h1"]
[Capture "no"]
[Check "no"]

[Position "2"]
[AttackedByBlack "h1"]
[NotAttackedByWhite "h1"]

I was searching for a position where the only winning move for white is Qa8-h1, a silent move without capture or check. Two black rooks should protect h1, so the queen move should be a sacrifice on a double protected corner square! It turned out that I was lucky: there exists a position like that!
I have succeeded to turn this position into a nice study which will be published soon.

Study 146

Árpád Rusz
Zinchuk-80 MT
2018
1st-2nd Prize

White wins

1. Rh2+ (1. c6? Ng3 2. c7 Rc4+ 3. Rc2 Ne2+ 4. Kd2 Nc3 =) 1... Kg3 2. Rd2! (2. Rxh1? Rc4+ =) 2... Rc4+! (2... Rxd2 3. Kxd2 Nf2 4. Bd5! (4. Bh1? Nxh1 5. c6 Nf2 6. c7 Ne4+ 7. Kd3 Nd6 =) 4... Ng4 5. c6 Nf6 6. c7 +-) 3. Rc2 Rxc2+ 4. Kxc2 Nf2 The knight has managed to escape from the corner square. Unfortunately, the g3 square was blocked by the king so the knight had to choose the inferior f2 square.

5. Bh1!! Umnov Theme. The bishop moves to a square just left by the knight. (5. Bd5? Ng4 6. c6 Ne3+ 7. Kb3 Nxd5 =; 5. c6? Ne4 6. c7 Nd6 =) 5... b3+! (5... Nxh1 6. c6 Nf2 7. c7 Ne4 8. c8=Q +-) 6. Kxb3 (6. Kb2? Nd3+ =; 6. Kb1? Nd1! 7. c6 Nc3+ 8. Kb2 Nb5 =) 6... Nd3 7. c6 Nc5+ 8. Kc4 Ne6 9. Kd5 Nc7+ 10. Kc5! (10. Kd6? Na8! 11. Kd7 Nb6+ 12. Kd6 (12. Kc7 Nc4 =) 12... Na8 positional draw) 10... Na8! Compared to the initial position, the knight and the bishop have interchanged their places.

11. Kb5 Kf4 12. Ka6 Ke5 (12... Nc7+ 13. Kb6 Ne8 14. Bd5 Ke5 15. Bf7 Nd6 16. c7! +-) 13. Kb7 Kd6

14. Kxa8 +- Who would have thought that the knight will be captured not on h1 but on the opposite corner square?

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Related study: Study 122

Study 145

Árpád Rusz
Problem Paradise
2017

White wins

1. Bxf3! Rxg5! 1... Rxf3 2. g6 Rf1+ 3. Ka2 Rf8 4. g7 Ra8+ 5. Kb3! echo 5... Kd3 6. Kb4 Rb8+ 7. Ka5 Kc4 8. Be5 Re8 9. Kb6! +- (9. Bd6? Rg8 10. Bf8 Rxg7! 11. Bxg7 Kxc5 =) 2. c6 Ke3

3. Bh1! Rg1+ 4. Kc2!! echo 4. Ka2? Rxh1 5. c7 Rc1 =; 4. Kb2? Rxh1 5. c7 Rh8 = 4... Rxa1 4... Rxh1 5. c7 chameleon echo 5... Rh8 6. Bxh8 +- 5. c7 chameleon echo 5... Ra8 6. Bxa8 +-

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Study 136

Árpád Rusz
JPA 85 JT
2017
Special Honourable Mention

Draw

Black has twice as much material than white so it looks very natural to start with a queen promotion: 1. e8=Q? a2 2. Rf6+ Kg2+ 3. Kc2 3. Kc4 Ra4+! 4. Qxa4 Rh4+ -+ 3... a1=N+! Black chooses to promote the pawn to a knight! 3... Rc3+? 4. Kd2 Rd5+ 5. Ke2 Rc2+ 6. Ke3 Rc3+ 7. Ke2 =

Variation A:

4. Kb2 Rb3+ 5. Kc1 Rc5+ 6. Kd2 6. Kd1 Rb1+ 7. Ke2 Rc2+ 8. Kd3 Rd1+ 9. Ke3 Re1+ -+ 6... Rc2+ 7. Kd1 Rb1#

echo checkmate

Variation B:

4. Kd1 Rh1+ 5. Kd2 Ra2+ 6. Kd3 Rd1+ 7. Kc3 Rc2+ 8. Kb4 Rb1+ 9. Ka3 Rb3+ 10. Ka4 Ra2#

echo checkmate

Let's go back to the initial position of the study.

The actual solution starts with a surprising sacrifice: 1. Rh6!! a2! 1... Rxh6 2. e8=Q a2 3. Qf7+! (3. Qf8+? Kg2 4. Qg7+ (4. Qxh6 a1=Q -+) 4... Rg6 5. Qb2+ Kh3 6. Qc3+ Rg3 -+) 3... Kg2 4. Qb7+! Kg1 5. Qg7+ Rg6 6. Qd4+ = 2. Rxh3+ Kg2

3. Rh1!! 3. e8=Q? a1=Q 4. Qe4+ Kxh3 5. Qf3+ Kh4 6. Qf4+ Kh5 -+ 3... Kxh1 3... Re5 4. Ra1 Rxe7 5. Rxa2+ Kg3 6. Ra5 Rc7 7. Rd5! Kg4 8. Rd4+ Kg5 9. Rd5+ Kg6 10. Rd6+ Kg7 11. Rd5! Rc6 12. Kb4! Kg6 13. Kb5 Rc8 14. Rd6+ Kg5 15. Rd5+ Kg4 16. Rd4+ Kg3 17. Rd3+ (17. Rd5? Rh8 -+) 17... Kg4 18. Rd4+ Kg5 19. Rd5+ Kg6 20. Rd6+ perpetual check) 4. e8=Q Finally, the pawn promotes to a queen. 4... a1=Q 5. Qe4+ Kh2 6. Qh4+ Kg2 7. Qg4+ Kf2 8. Qf4+ Ke2 9. Qe4+ Kd2 9... Kf2 10. Qf4+ Kg2 11. Qg4+ Kh2 12. Qh4+ perpetual check 10. Qd4+! Qxd4 stalemate

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Study 123

Árpád Rusz
Malyshko-105 MT
2017
2nd Prize

White wins

Thematic try: 1. Nb3? Ne6+! Black thematic try: 1... Nc6+? 2. Kxd5 Nb8 3. Nc5 Kc2 4. Na6! Nd7 5. Ke6 Nb6 6. Nc7 Kb3

7. Na8!! The white knight leaves the d5 square empty for the king. 7... Na4 8. Kd5! +- 2. Ke5! 2. Kxd5 Nf8 3. Nd4 Kd2 4. Ne6 Nd7 5. Kc6 Ne5+ 6. Kd5 Nd7 positional draw 2... Nf8 3. Nc5 d4 or 3... Kc2 4. Kf6 d4 4. Kf6 Kc2 5. Kf7 d3 6. Nxd3 Nd7 7. Ke8 Nf6+! 7... Nb6? 8. Nc5 Kc3 9. Na4+! = 8. Ke7 Nd5+ 9. Ke6 Nb6 10. Nb4+ Kb3

Position X'

11. Nd5 Unfortunately, the white knight blocks the d5 square. 11... Na4! 12. d7 12... Kd5 was not possible anymore. 12... Nc5+ =

Solution: 1. Nf3! Nc6+! The black knight tries to stay on the other flank compared to the white knight's position. 1... Ke2 2. Ne5 Ne6+ 3. Kxd5 Nf8 4. Ng6! +- 2. Kc5! 2. Kxd5? Nb8 3. Nd4 Kd2 4. Nc6 Nd7 5. Ke6 Nc5+ 6. Kd5 Nd7 positional draw 2... Nb8 3. Ne5 d4! 4. Kb6! There is no time to pick the pawn! 4... Ke2 5. Kb7! The black knight is caught but it will manage to escape. 5... d3 6. Nxd3 There was no time to pick the black knight. 6... Nd7 7. Kc8! This is the best square to avoid some nasty knight forks. 7. Kc6? Nf8! 8. Ne5 Kd2! (8... Ke3? 9. Kd5 = mutual zugzwang) 9. Ng6 Nxg6 10. d7 Ne5+ = 7... Nb6+! Before going to the longer flank, the black knight tries to chase the king to a less favourable square. 8. Kc7 Nd5+ 9. Kc6 Nf6 By pushing the white king to c6, black has managed to dismiss g4 as a square for a knight sacrifice. 10. Nf4+ Kf3

Position X

We have a situation similar to the initial position: the attacked knight has to decide again which way to go. 11. Nh5!! The white knight finds another square to sacrifice itself using the extra file. 11. Nd5? is bad because it blocks the d5 square: 11... Ng4! 12. d7 Ne5+ = 11... Ng4 12. Kd5! +- This move is the reason why the d5 square was left empty!

It is paradoxical that the knight is better placed on the edge of the board (h5) or even on a corner square (a8) than in the centre (d5)!

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Study 122

Árpád Rusz
Polish Chess Federation Ty
2017
Commendation

White wins

1. Bb7! White pins the black rook. Taking it would be a mistake: 1. Rxe4? Bh7! = 1... Kg3! Black unpins its rook and forces white to capture on e4 with the rook. 2. Rxe4 Bh7 Now the white rook is pinned. It could be unpinned by a king move, but where should the king go?

3. Ka1!! This is the correct way to try to get out of the pin! 3... Bxe4 4. Bxe4 Nf2

5. Bh1!! Another move to a corner square! White is moving to a square just left by black (Umnov Theme). Thematic try: 5. Bb7? Kf4 6. a4 Ke5 7. a5 Kd6 8. a6 Kc7 9. a7 Kxb7 = 5... Kf4 5... Nxh1 6. a4 Nf2 7. a5 Ne4 8. a6 Nc5 9. a7 +- White is lucky to have its king is on a1! With the king on b2, black still could have saved the game by 9... Na4+ followed by 10... Nb6. 6. a4 Ke5 7. a5 Kd6 8. a6 Kc7 9. a7 +-

The thematic try on move three also features a king move to a corner square: 3. Kb2? Bxe4 4. Bxe4 Nf2 5. Bh1 Nxh1 6. a4 Nf2 7. a5 Ne4! 8. a6 Nc5 (or 8... Nd6 9. a7 Nc4+ 10. Kb3 Nb6 etc.) 9. a7 Na4+ 10. Kb3 Nb6 11. Kb4 Kf4 (11... Na8) 12. Kb5 Na8 13. Kc6 Ke5 14. Kb7 Kd6 15. Kxa8 The problem is that the king gets stalemated there: 15... Kc7 16. a4 Kc8 17. a5 Kc7 18. a6 Kc8 stalemate

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Study 121

Árpád Rusz
Shakhmatnaya Kompozitsia
2017
2nd Honourable mention

White wins

1. Ng3 The knight takes the e4 square from the black king. 1... Nd6 1... Ke3 2. f5 Kf4 3. b4! Kxg3 4. b5 Kf4 5. b6 Nd6 6. f6 Ke5 7. b7! (7. f7? Nxf7+ =) 7... Nxb7 8. f7 +- 2. Kg7 2. f5? Ke5 3. Kg7 Nxf5+ 4. Nxf5 Kxf5 = 2... Ne4 Now the white knight has to leave. Fortunately, the black king still cannot attack efficiently the f-pawn because the e4 square is blocked. 2... Ke3 3. f5 Kf4 4. Kf6! Kxg3 5. Ke6 +-

3. Nh1!! The only way to win is by a Switchback move and a voluntary self-incarceration of the white knight! The knight had 5 other squares to go, let's see why were they wrong:
3. Nxe4? Kxe4 4. b4 Kxf4 5. b5 Ke5 6. b6 Kd6 7. b7 Kc7 =;
1st thematic try: 3. Nh5? Kc4 4. Kf7 Kb3 5. Ke6 Kxb2 6. Ke5 Position 1 6... Nf2! =;
2nd thematic try: 3. Nf1? Kc4 4. Kf7 Kb3 5. Ke6 Kxb2 6. Ke5 Position 2 6... Nc5! = (6... Nf2? 7. f5 Ng4+ 8. Ke6 Kc3 9. Ne3! +- echo sacrifice);

echo sacrifice

3. Nf5+? Kc4 4. Ne3+ Kd3 5. Nd1 Nd6 6. Kf6 Ke4 7. Kg5 Nf7+ 8. Kg4 Nh6+ 9. Kg3 Nf5+ 10. Kg4 Nh6+ 11. Kg5 Nf7+ perpetual check;
3. Ne2+? Ke3 4. f5 Kxe2 =
3... Kd5! 3... Kc4 4. Kf7! Kb3 5. Ke6 Kxb2 6. Ke5 Position 3 6... Nc5 7. Nf2! +-; 3... Ke3 4. f5 Kf4 5. f6 Nxf6 6. Kxf6 +- 4. f5 4. Kg6? Ke6 5. f5+ Ke5 mutual zugzwang 6. b4 Kd5 7. b5 Kd6! 8. Ng3! Nxg3 9. f6 Ne2 10. f7 Nf4+ 11. Kf5 Ne6 12. b6 Nf8 13. b7 Kc7 = 4... Kc4! Only now! Kf7 is not possible anymore. 4... Ke5 5. Kg6 +- mutual zugzwang 5. Kg6! 5. Kf7? Nd6+ 6. Ke6 Nxf5 7. Kxf5 Kb3 = 5... Kb3 6. Ng3! +- White white wins repeating the first move from the initial position.

echo sacrifice

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Study 120

Árpád Rusz
WCCT-10
2016-17
(D31)

White wins

1. Nd8 Nc7+! 1... Bxd4 2. Nf7#; 1... Ng5 2. Bc4 +- 2. Kf8! f1=Q+ 3. Nf7+ Qxf7+ 4. Kxf7 Ng5+ 5. Kg6 Nxh7 6. Bxh7 Bxd4! 7. Bxd4 Ne6

8. Ba1!! Thematic tries: 8. Be5? Nf8+ 9. Kf7 Ng6! 10. Bxg6/Kxg6 stalemate; 8. Bc3? Nf4+ 9. Kg5 Nd5! (9... Ne2? 10. Bb2 Kxh7 11. Kg4 g5 12. Kxg5 Ng3 13. Kf4 Nf1 14. Bc1 +-) 10. Bb2 Kxh7 =; 8. Bb2? Nf8+ 9. Kf7 Ng6! 10. Bg8 Ne5+! 11. Ke8 (11. Bxe5 stalemate; 11. Kf8 Ng6+ 12. Kf7 Ne5+ positional draw) 11... Nd3! (11... Nc4? 12. Bxc4 +-) 12. Bd4 Kxg8 = 8... Nf8+ 8... Nf4+ 9. Kg5! (9. Kf5? Nxg2 10. Bg6 Nh4+ =) 9... Ne6+ 10. Kf5 Nf8 11. Bg6 Nxg6 12. Kxg6 +- 9. Kf7 Nxh7 9... Ng6 10. Bg8 +- double Switchback (K & B) 10. Bxg7#

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Here you can find the other entries from the tourney: WCCT-10