Showing posts with label Corresponding squares. Show all posts
Showing posts with label Corresponding squares. Show all posts

Sunday, 2 November 2025

The Fahrni-Alapin Position

Who discovered first this famous position with a stunning winning manoeuvre? Fahrni and Alapin? Em. Lasker? Kling and Horwitz? Chapais? I have a new answer to this question!

White wins even on the move!

Fahrni, in his book Das Endspiel im Schach (Leipzig, 1917), gave this as a position from a game Fahrni-Alapin without giving more details. In the later chess literature, the game was sometimes referred to as Fahrni-Alapin (1912), but no game score ever surfaced.

In 1905, a game between Paul Fiebig and Savielly Tartakower reached this position after black's 54th move:

The game continued with the moves

55. a5 bxa5 56. bxa5 Kd7 57. c5 Kc7 58. c6 Kc8

In this winning position, a disappointing draw followed...

59. Kd6 Kd8 60. Kd5 Kc8 1/2-1/2

Emanuel Lasker gave some lectures in London in 1895, and a book based on those lectures was later published by him: Common Sense in Chess (London-Berlin, 1896). The position from page 108 is familiar:

He gives the following analysis: "White has two chances of winning, the one based on his passed Pawn, the other on the weakness of the black RP. The black K occupies at present a position of advantage in regard to both. This is changed by the following manœuvre:"

1. Kd5 Kc8 2. Kc4 Kd8 3. Kd4 Kc8 4. Kd5 Kc7 5. Kc5

The famous book by Joseph Kling and Bernhard Horwitz, Chess studies or Endings of Games (London, 1851) already contained a similar position:

They gave the following solution:

1. Ke5 Kd8 2. Kd4 Kc8/Ke8) 3. Ke4 Kd8 4. Ke5 Kd7 5. Kd5 and wins. "White, by the mode of play adopted, gains either the opposition and wins with the Queen's Pawn, or else gains the Black Pawn, and then wins easily."

Actually, White doesn't need this fancy manoeuvre to win in this position, in the 1884 edition of the book, "another useful solution" is given:

1. Ke5 Kd8 2. d7 Kxd7 2... Kc7 3. d8=Q+ +- 3. Kd5 Kc7 4. Ke6 Kc8 5. Kd6 Kb7 6. Kd7 Kb8 7. Kc6 Ka7 8. Kc7 Ka8 9. Kxb6 and wins.

By the way, this solution with a pawn sacrifice wouldn't work in our original position.

Only 10 pages later, the same book contains another study featuring our position.

The solution given by the authors is quite surprising... and wrong.

1. a5 bxa5 2. Kc1 a4 3. Kd1 Kd4 4. Kc2 Kc4 5. a3 "and draws".

1. a5? is actually a blunder; the right drawing move was 1. Kc1.
3... Kd4? is another mistake; 3... c2 wins.
The biggest blunder, though, is the "and draws" part. After white's 5th move, we have the "Fahrni-Alapin Position" on the board, only with reversed colours!

This position is a win, not a draw, and the winning method was given by the authors in their previous composition 10 pages earlier... Of course, Kling and Horwitz were geniuses, but pawn endgames can be so tricky sometimes.

Our time travel doesn't end here. Von der Lasa, in 1862, published the first position from an old French manuscript by "Chapais" (probably a pseudonym). This truly remarkable manuscript of an endgame book Essais Analytiques sur les Echecs was probably completed in 1777 by the mathematician Gaspard Monge. Last year, Herbert Bastian published the book Chapais – Das revolutionäre Schachmanuskript von Gaspard Monge (Berlin, 2024), presenting the whole content of the MS.

One remarkable discovery is that "our position" was already in the Chapais MS! Here's the analysis from the manuscript:

White wins whoever is on move

1. Kd5 Kc8 If 1... Kd8 or 1...Kb8 then the white king goes to d6 already on the second move. 2. Kd4 If 2. Kd6 then 2... Kd8, and the checkmate will be delayed. 2... Kd8 If black returns 2... Kc7, white immediately gets the zugzwang by 3. Kc5, and from there, it penetrates through b6 and wins more quickly; 2... Kb8 is answered by the same 3. Kc4 3. Kc4 Kc8 4. Kd5 Kd8 5. Kd6 Kc8 6. c7 This is the moment when White must advance the pawn. The pawn must reach the penultimate rank without a check to avoid a draw or a stalemate. It can be observed that White's preceding king march was steered towards this goal. 6... Kb7 7. Kd7 Ka7 8. Kd8 Kb7 9. c8=Q+

Our journey is not over yet! Today, I have discovered an even earlier source for this endgame.

Giambattista Lolli, in his book Osservazioni teorico-pratiche sopra il giuoco degli scacchi (Bologna, 1763) pp. 489-499, has a lengthy analysis of the following position:

He concludes that White wins whoever is on move. White has two winning methods.

The first is a nice breakthrough: 1. Kd5 Kd7 2. f6! gxf6 3. g6! hxg6 4. h6! +-
The second method starts with the pawn push 1. g6.

He is also analyzing the two other possible pawn pushes, which lead only to a draw: 1. h6? and 1. f6?.

1. h6? is easy to prove to be a draw, but for 1. f6? "it is necessary to act with great circumspection, as one must sometimes handle the King contrary to the rules suggested for King against King and Pawn, because here both Kings have an extra Rook's Pawn that they can move..."

After the moves 1. f6+? gxf6+ 2. gxf6+ Kf7 3. Kf5, he reaches the following position:

Now, black has to be very careful. The natural retreat 3... Kf8? loses after 4. Ke6 Ke8 5. f7+! Kf8 6. Kf6, and there is no stalemate. One must choose 3... Ke8! (or 3... Kg8!) to draw. Then 4. Ke6 Kf8 5. f7 h6 6. Kf6 is a stalemate.

He also proves that 3... h6?, which leads to a mirrored Fahrni-Alapin Position, loses.

His main line is 4. Ke5 Kf8 The black King "goes to f8 to opportunely face the opponent's King if he comes to e6, but White disappoints him with a subtle move like this:" 5. Kf4! Kg8 6. Ke4! "White does not go with the King to e5, because Black would go with the King to f8; nor does he go to f5, because Black would go to f7, then to his own house as above, and so the game would be a draw; But he withdraws the King to e4 to gain the move."6... Kf8 Black doesn't know what to do. 7. Ke5 Ke8 8. Ke6 Kf8 9. f7 Kg7 10. Ke7 Kh7 11. Kf6 This leads to a quicker checkmate than the move chosen by Chapais. (11. f8=Q? stalemate) 11... Kh8 12. f8=Q+ Kh7 13. Qg7#

Fahrni's book contains a similar endgame to Lolli's position, so there is a high chance that he was familiar with Lolli's analysis. Maybe he just made two nice studies out of this messy position. Or maybe there was a real game Fahrni-Alapin.

H. Fahrni
Das Endspiel im Schach
1917
White wins
1. f6! gxf6 2. g6! hxg6 3. h6! +-

A useful link about this topic: www.chesshistory.com

Monday, 29 September 2025

Study 199

This is my version of the famous Lasker-Reichhelm position:

Árpád Rusz
2025
Draw

In this endgame, opposition fails completely: 1. Kb2? Kc8! 2. Kc2 Kd8! 3. Kd2 Kc7! 3... Ke8? 4. Kd1? Ke7 5. Kd2 Ke6 6. Kd1 Ke5 7. Kd2 = 4. Kc1 Kd7 5. Kb1!? 5. Kd1 quickly loses after 5... Kc6 6. Kc2 Kd6 -+ 5... Ke6 5... Kc6? 6. Kb2 = 6. Kc1 Kf5 7. Kd2 Kg4! 8. Ke2 Kf4 9. Kf2 Ke5 and the queen-side cannot be protected anymore.

1. Ka2! Instead of opposition, the best strategy is to use "anti-opposition". 1... Kb7 2. Ka1!! 2. Ka3? Kc7 3. Kb3 Kd7 4. Kc2 Kd6 -+ 2... Kb6 3. Ka2 Kc5 4. Kb3 Kc6 5. Kb2 Kc7 6. Kb1! Kd6 7. Kc2 Kd7 8. Kc1! Ke6 9. Kd1(2) Kf5 10. Ke1! 10. Ke2? Kf4! 11. Kf2 Ke5 -+ 10... Kg5 11. Kf1! Kg4 12. Kf2 Kf4 13. Ke2 Kf5 14. Ke1 Kf6 15. Ke2 Kf7 16. Ke1! Kg7 17. Kf1! Kg8 18. Kf2 Kf8 19. Ke2! = Don't be tempted to step forward! 19. Kf3? Ke7 20. Kg4 Kd6 21. Kxh3 Kc5 22. Kxh4 Kb4 23. Kg5 Kc3! (23... Kxa4 $2 24. h4 Kb3 25. h5 a4 26. h6 a3 27. h7 a2 28. h8=Q a1=Q 29. Qb8+ Kc2 30. Qh2+ Kc3 31. Qc7+ Kb3 32. Qb8+! =) 24. h4 Kxd3 -+

Watch this study on a dynamic board.

Sunday, 28 September 2025

Study 198

A study composed after the game Shankland vs Firouzja (FIDE Grand Swiss 2025):

Árpád Rusz
2025
- version -
Draw

The play is governed by the theory of corresponding squares:

White has to fight against three black attack plans:
1) Penetration of the king through e5
2) The sacrifice d5-d4! followed by Kd5 and Kxd4
3) The sacrifice b6-b5! followed by bxa5 bxa4

1. Ka1!! 1. Kb3? Kc7! 2. Kb2 Kc6 3. Kb3 (3. Kb1 d4! 4. cxd4 Kd5 -+) 3... Kd7! 4. Kb2 Ke6 5. Kc2 Kd6! 6. Kd3 b5! -+ 1... Kc7 2. Kb1! Kc6 3. Kb2! Kd7 4. Kc1! Kd6 5. Kc2! Ke5 6. Kd3 Kf4 Now we have reached a position from the game.

7. Ke2! The continuation from the game was: 7. bxa5? bxa5 8. Kd4 Kf3 9. Kd3 Kg2 10. Kd4, and white resigned. 7. Kd4? Kf3 8. Kd3 Kg2 9. Ke2 Kxh2 10. Kf2 Kh1! (10... h4? 11. b5 =) 11. bxa5 (11. b5 Kh2 -+) 11... bxa5 12. Kg3 Kg1! -+; 7... Ke4 8. b5! d4 8... Kf4 9. Kf2 h4 10. Ke2 Ke4 11. Kd2 Kf3 12. Kd3 Kg2 13. Ke3 Kxh2 14. Kf2 = 9. cxd4 Kxd4 10. Kf3 Kc4 11. Ke4! Kb4 12. Kd5 Kxa4 13. Kc6 Kb4 14. Kxb6 a4 15. Kc6 a3 16. b6 a2 17. b7 a1=Q 18. b8=Q+ =

Watch this study on a dynamic board.

In the first version of the study the bK stood on c7:

Árpád Rusz
2025
Draw

1. Kb1!! etc.

See the endgame Shankland vs Firouzja analized on Youtube:
GM Daniel King's Youtube channel
"chessroo" Youtube channel

Thursday, 16 January 2020

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.

Watch this study on a dynamic board! Click here!

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

Monday, 6 June 2016

Study 58

Árpád Rusz
Internet (Talkchess Forum)
2012
- after B. Jones & R. Brieger -

White wins

1. Rh8+! (Thematic try: 1. Nxe4? Nxb8+ 2. Kb7 Nxa6! 3. Kxa6 dxe4 4. hxg7 Kg8! 5. Kxa7 Kxg7 6. Ka6 Kg6! 7. Ka5 Kg5! =) 1... Kxh8 2. Nxe4 Nb8+ 3. Kb7 Nxa6 4. Kxa6 dxe4

5. h7!! Paradoxically, the reason for the Rook sacrifice is not to play hxg7 with check, White is playing to get rid of its harmful Pawn without capturing the Black Pawn! 5...Kxh7 6. Kxa7 Kg6 7. Ka6 Kg5 8. Ka5 Kg4 9. Kb6 Kf5 10. Kb5 Kf4 11. Kc6 Kg5 12.Kc5 Kg4 13. Kd6 Kf5 14. Kd5 Kf4 15. Ke6 +- White wins using the distant opposition.

Watch this study on a dynamic board! Click here!

Árpád Rusz
Internet (Talkchess Forum)
2012
- after B. Jones & R. Brieger -
- version -

White wins

1. Nf7+! 1. Nxe4? Bxa6+ 2. Kxa6 dxe4 3. hxg7+ Kxh7! 4. Kxa7 Kxg7 5. Ka6 Kg6! 6. Ka5 Kg5! 7. Ka4 Kg4! =; 1. hxg7+? Kxh7 2. Nxe4 Bxa6+ 3. Kxa6 dxe4 4. Kxa7 Kxg7 = 1... Kxh7 2. Ng5+ Kh8 3. Nxe4 3. hxg7+? Kg8! 4.Nxe4 Bxa6+ 5. Kxa6 dxe4 6. Kxa7 Kxg7 = 3... Bxa6+ 4. Kxa6 dxe4

5. h7!! Kxh7 6. Kxa7 Kg6 7. Ka6! Kg5 8. Ka5! Kg4 9. Kb6 Kf5 10. Kb5 Kf4 11. Kc6 Kg5 12.Kc5 Kg4 13. Kd6 Kf5 14. Kd5 Kf4 15. Ke6 +-