Wednesday 18 October 2017

Study 129

Michael Byrne & Árpád Rusz
Shakhmatnaya Kompozitsia
2017

White wins

1. Ka5! 1. Kb5? Bd3+! 2. Rxd3 Rxc1 = 1... Bc2! 2. Bxa3! 2. Rxa1+? Kxa1 3. Bxa3 b2 = 2... Kxa3 3. R1xc2! 3. Rxa1+? Kb2 = fork

Main 1:
3... Ra2 4. Rc1 Rg2!


5. Rf3!!

Thematic try: 5. Rh3? Rg5+ 6. Kb6 Rg6+ 7. Kb5 Rg5+ 8. Kc4 Ka2 9. Kb4 Rg4+ 10. Kc3 b2 11. Rc2 Ka1! 12. Rxb2 Rg3+! 13. Rxg3 stalemate 5... Rg5+ 6. Kb6 Rg6+ 7. Kb5 Rg5+ 8. Kc4 Ka2 9. Kb4 Rg4+ 10. Kc3 b2 11. Rc2 Ka1 12. Rxb2 +-

Main 2:
3... Rh1


4. Rf2!!

1st thematic try: 4. Rg2? Rh3 5. Rc4 Rh5+ 6. Ka6 Rh3/Rh6(8) 7. Kb5 Rh5+ 8. Kc6 Rh6+ 9. Kd5 Rh5+ 10. Ke6 Rh6+ 11. Kf5 Rh5+ 12. Kg6 (12. Kf6 Rh6+ 13. Kg5 Rh8! 14. Kf6 Rh6+ positional draw) 12... Rb5 13. Rg3 Ka2 14.Ra4+ Kb1 15. Rg1+ Kb2 16. Kf6 Rc5 17. Ke6 Rc1 18. Rg3 Rc3 19. Rg8 Kb1 20. Ra3 Kb2 21. Rga8 Kc2 = Position X'. The white king is too far to help.

4... Rh3! 5. Rc4 5. Rxh3? stalemate 5... Rh5+ 6. Ka6! 6. Kb6? b2 7. Rf3+ Ka2 8. Ra4+ Kb1 9. Rf1+ Kc2 10. Rb4 Kc3 = 6... Rh3 6... b2 7. Rf3+ Ka2 8. Ra4+ Kb1 9. Rf1+ Kc2 10. Rb4 Kc3 11. Rb8 +- 7. Kb5 Rh5+ 8. Kc6 Rh6+ 9. Kd5/Kc(d)7 9... Rh5+ 10. Kd(e)6 10... Rh6+ 11. Ke5(7) 11... Rh5+ 12. Kf6 Rh8! 13. Kf7! 13. Kg7? Rb8 = 13... Rh7+ 14. Kg6 Rb7 15. Rf3 Ka2 16. Ra4+ Kb1 17. Rf1+ Kb2! 17... Kc2 18. Rc4+ Kd3 19. Rcc1 b2 20. Rfd1+! Ke2 21. Rb1 +- 18. Kf6! Rc7 19. Ke5! In contrast to the thematic try, there was no rook protecting the fifth rank. 19... Rc1 20. Rf3 Rc3 21. Rf8! White doesn't allow a black counterplay based on Rc8. 21... Kb1 22. Ra3! The only way to stop the pawn is by pinning. 22... Kb2 23. Rfa8 2nd thematic try: 23. Kd4? Rh3! 24. Ra7 Rh4+ 25. Ke5 Rh5+ 26. Kf4 Kb1! Black uses the poor position of the f8 rook which is obstructed by its own king. 27. Rb8 b2 = This try failed only because the rook was on the f-file so white will start a manoeuvre to reposition the rook to another file. 23... Kc2 Position X. Now the white king is closer compared to Position X' reached in the 1st thematic try.


Position X


Position X'

24. Kd4! Rd3+ 25. Ke4! White leaves the c-file open for a rook check. 25. Kc4? b2 26. Rxd3 b1=Q = 25... Rc3 26. Rg(h)8 Kb2 26... b2 27. Rg2+ Kd1 28. Rxc3 b1=Q+ 29. Rd3+ Ke1 30. Rg1+ +- 27. Kd4! Unlike the 2nd thematic try, now that the rook was repositioned from f8, this plan works.27...Rc2! Although the best square for the black rook is c1, black deliberately wastes a tempo before putting it there trying to play for a zugzwang. 28. Rga8 28. Ra4? Kb1 29. Rc4 b2 = Now we see the reason for moving the black rook to c2 instead of c7. With an unprotected rook, this pawn move wouldn't be possible. 28... Rc1 The threat 29.Ra1 had to be stopped. Now white seems to be in zugzwang but it still can win by transferring the move to black.


cyclic zugzwang - WTM

29. R3a4(5,6,7) White threatens to put a rook to the b-file. Beside occupying the first rank, this is white's other plan to win. 29... Kb1! Black aims for a fortress by trying to push the pawn. 30. Ra1+ 30. Rb7? b2 = fortress 30... Kb2 31. R1a3!


cyclic zugzwang - BTM

31... Rh1 Black has to keep the rook on the first rank. 32. R3a5(6,7) 32... Kb1 This is the last try to build the fortress. Now that the black rook has moved from c1, this move loses immediately. 33. Ra1+ +-

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